A Beam Energy Monitor (BEM) was developed for the cyclotron of the HUN-REN ATOMKI, using TOF measurements on a short flight path. The sensor unit uses two capacitive probes at a distance of 20 cm, the entire geometry is about 40 cm long. The compact size allowed the unit to be installed in the main beamline, making it possible to measure and monitor the beam energy independently of the...
In collaboration with the University Hospital Charité–Universitätsmedizin Berlin the Helmholtz-Zentrum Berlin has treated more than 4900 patients with ocular tumours using protons with an energy of 68 MeV. Parallel to tumour treatment is an on-going research programme on beam delivery, dosimetry, and radiation hardness tests. For the set-up of new beamlines and to increase our research...
Beam Position Monitors (BPMs) are the most commonly used non-destructive diagnostics for almost all linear accelerators, cyclotrons, and synchrotrons. It is very important for BPM to provide accurate beam position for closed-orbit correction, and etc. Meanwhile, it is necessary to accurately offline calibrate the BPM position sensitivity and evaluate whether the result is correct or not. In...
A phase detection system has been implemented at the Taiwan Photon Source, employing beam position monitor (BPM) electronics integrated with a digital inphase/quadrature (I/Q) demodulation scheme. This system enables high-resolution analysis of beam phase stability, RF cavity field phase, and synchronization integrity of the RF clock distribution. It also facilitates the investigation of beam...
A bead test was conducted to measure the shunt impedance (R/Q) of the cavity beam position monitor (BPM) for PAL-XFEL. R/Q is an important parameter of a cavity BPM because it relates to the signal strength, which determines the resolution of the beam position measurement. In the bead test, a dielectric and metal bead were used to assess the frequency change at various bead positions. The...
DALI is an envisioned suite of advanced accelerator-based THz sources that are continuously tunable over the frequency range from 0.1 THz to 30 THz. The THz sources will provide radiation with high pulse energy (up to 100 µJ – 1 mJ) at a high but flexible repetition rate up to 1 MHz. An MeV ultra-fast electron diffraction (UED) source will complement this facility.
The contribution will...
The Advanced Photon Source Upgrade (APS-U) implements a novel swap-out injection scheme. To comprehensively characterize the beam dynamics during swap-out injections, approximately 20 Beam Position Monitors (BPMs) in the initial sections of the storage ring have been equipped with high-precision single-bunch electronics. These systems are capable of measuring the turn-by-turn positions of the...
The Linear IFMIF Prototype Accelerator (LIPAc) validates key features of the IFMIF. After completing Phase B+, it is preparing for Phase C. Beam Position Monitors (BPMs), essential non-interceptive diagnostics for beam alignment and time-of-flight measurements, were only partially calibrated but provided key data for commissioning. As BPMs will be even more critical in Phase C, a full...
PERLE is an Energy-Recovery Linac (ERL) to be constructed at IJCLab in Orsay. It will be the First multi-turn ERL with superconducting RF (SRF) with the ambition to reach 10MW beam operation (20mA beam current and 500MeV beam energy)
Diagnostics are a key element for PERLE operation and among diagnostics, the salient feature for Beam position monitors (BPMs) is the presence of multiple beams...
By directly sampling the BPM signals with a high sampling rate oscilloscope, the bunch-by-bunch position and phase were calculated. With the help of injection trigger signal, oscilloscope was utilized to capture the injection process. The energy mismatch of the injection transient process and the residual oscillation of the injection bunch were studied. The longitudinal tune and oscillation...
To measure bunch lengths at the SLS 2.0, a streak camera is often used. Although a superb device, degradation of the photocathode with extended exposure prevents its use as a continuous beam monitor. We have been exploring the use of high-bandwidth photodiodes together with RF components to sample the beam spectrum at frequencies that correspond to the spectrum of a single bunch, which extends...
A Feshenko-style Bunch Shape Monitor (BSM) is used to measure longitudinal profiles of the H+ and H- beams at the Los Alamos Neutron Science Center. We present the results of a study done to characterize how the longitudinal profile of each species if affected by different parameters of the RF bunchers and linac modules upstream of the BSM. Features of the longitudinal profiles are elucidated...
As part of the ongoing ALBA II upgrade, which aims to significantly enhance the performance of the ALBA Synchrotron Light Source, a new design for button Beam Position Monitors (BPMs) is under investigation. In this contribution, we present the results of a characterization study conducted on button prototypes supplied by two different manufacturers. Furthermore, we introduce the preliminary...
This paper describes the main stages of the journey from preliminary ideas on button shapes to actual measurements on prototypes of Beam Position Monitor (BPM) devices for Elettra 2.0.
In the first stage, the electromagnetic phenomena involved in BPM sensors were studied taking into account different pick-up geometries, dielectric and conductive materials, and bunch lengths. Critical aspects...
Accurate measurements of bunch length and shape are crucial for the proper operation and optimisation of accelerator facilities. This work presents a simulation study of a dielectric-lined waveguide (DLW) streaker structure designed to measure both the bunch length and longitudinal profile for the CLARA facility at Daresbury Laboratory*. The structure consists of two orthogonally oriented...
The goal of the Advanced Wakefield Experiment (AWAKE) is to accelerate externally injected electrons using a plasma wakefield driven by a 400 GeV proton bunch. To achieve this, the electron bunches must have a short bunch length of 200 fs, making the implementation of a real-time, non-invasive bunch length monitor essential. This monitor uses alumina dielectric prisms inserted into the vacuum...
The Canadian Light Source (CLS) is a third generation 2.9 GeV synchrotron comprised of a 250 MeV LINAC, a full energy booster, and a storage ring with 13 insertion devices and 22 operational beamlines ranging from infrared light to hard X-rays.
The Timing System supplies the triggers required to synchronize operation of all components responsible for injecting current into the storage ring....
Laser-based electro-optic detection (EOD) has been a valuable tool to measure the longitudinal electron bunch shape with sub-ps resolution for almost a decade, but it has always been a tool for expert use. Recently, the server and the user interface has been updated allow automated laser locking, time calibration and measurements to prepare for general operator use at the EuXFEL. It is...
For the upgrade of the electro-optical bunch arrival-time monitors (EO-BAMs) employed at several X-ray free-electron laser (XFEL) facilities, a novel pickup structure has been proposed, and its feasibility was successfully tested at the ELBE accelerator. The design, comprising planar pickups on a printed circuit board (PCB) with an integrated combination network, delivers a significantly...
We present preliminary experimental results on the measurement of the current profile and longitudinal phase space (LPS) of an ultrarelativistic electron beam using a corrugated structure at the Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL). The electron bunch is streaked by the transverse wakefield induced by the corrugated plates, resulting in a correlation between the...
The AWAKE facility at CERN uses novel proton beam-driven plasma wakefields to accelerate electron bunches over a 10 m plasma source. The facility will soon be rebuilt to study methods to improve the quality of the accelerated electron beam, requiring better resolution from the proton BPMs. In addition, it is desirable to replace the existing bespoke electron BPMs with an in-house solution....
The ILSF storage ring (528 m circumference, 3 GeV electron beam) requires precise beam diagnostics for stable operation. This paper details the design and simulation of button-type beam position monitors (BPMs) for this storage ring. Using CST Microwave Studio and BpmLab, we optimized a four-electrode button BPM configuration at 45° to the beam axis. The study compares different button...
EuPRAXIA@SPARC_LAB is a FEL user-facility currently under construction at INFN-LNF in the framework of the EuPRAXIA collaboration. The electron beam will be accelerated to 1 GeV by an X-band linac followed by a plasma wakefield acceleration stage. This high-brightness linac requires diagnostic devices able to measure the beam parameters with high accuracy and resolution. To monitor the beam...
An overview of performance and operation of Blade FEXBPMs installed at the MAX IV R3 storage ring frontends will be presented.
FEXBPM design, position calibration techniques, normalization to the storage ring current, resolution and some deficiencies of the operation will be discussed.
Suggestions for design strategy of the Blade FEXBPMs and overall improvements of the FEXBPM based on...
Cyclotron-based proton beams are widely used in research and medical applications due
to their capability to deliver bunched beams across a broad range of bunch charges. One
of the most critical components in beam diagnostics is the beam position monitor (BPM),
which must accurately measure the beam’s position while minimizing disturbance to the
beam.
At Kutaisi International University...
We have developed a Stripline BPM readout device based on an AMD/Xilinx RFSoC chip which integrates multiple ADCs, DACs, a large scale FPGA, and an ARM processor in a single package. The developed device is intended for use at the beam transfer line connecting the KEK injector Linac to the SuperKEKB collider rings. SuperKEKB will operate at unprecedented luminosities requiring very high beam...
The current bunch-by-bunch beam position measurement system at electron storage ring mainly based on high-sampling-rate oscilloscopes and transverse feedback electronics. The oscilloscope cannot achieve real-time bunch-by-bunch beam position measurement or large-scale online applications. The TFB electronics can only perform simple relative position measurements of single bunch at a time. The...
As part of the CSNS-II upgrade, an improved injection scheme will be implemented to mitigate the space charge effect. To precisely measure the transverse beam position during injection, painting, and storage in the Rapid Cycling Synchrotron (RCS), a large-aperture (260 mm × 180 mm) Beam Position Monitor (BPM) is essential. The rectangular cut-plane BPM was selected for its excellent linearity...
A new BPM processor is being developed to address the ageing of BPM signal processors and the new demand for synchronised data acquisition at the storage ring of Shanghai Synchrotron Radiation Facility (SSRF). The BPM processor consists primarily of a digital carrier board and an analog front-end (AFE) module. The AFE is responsible for the conditioning of the BPM output RF signal and for the...
The BL4N beamline at TRIUMF, currently under development, will transport proton beam from the 500 MeV cyclotron to an ISOL target station. The peak beam current will be varied from 1 to 100 microamps, and the beam position must be measured over a 10mm range. The beam position is measured using inductive pick-ups and a new narrowband frontend. The electronics consist of a crossbar-switched...
PAL-XFEL is preparing for double bunch operation scheduled for 2027 by upgrading various systems, including the BPM (Beam Position Monitor) infrastructure. However, the existing BPM electronics are optimized for single bunch signals, and when double bunches are injected, signal overlap occurs, making accurate position measurements difficult. To address this issue without significantly...
SenSiC GmbH, a spin-off from the Swiss Light Source (SLS), has developed a new class of beamstopper sensors, termed Beamstopper Integrated Sensors (BIS)[1,2], based on Silicon Carbide (SiC) semiconductor technology. Using custom processing and assembly methods, BIS devices achieve ultra-compact footprints below 1 mm and are designed for both real-time intensity monitoring and four-quadrant...
CLARA is a high-brightness 250 MeV electron test facility, which aims to deliver high quality beams to a flexible user area called FEBE, supporting experiments in areas such as novel acceleration. * The requirements of these experiments impose stringent diagnostic requirements. This paper will describe progress on the pyroelectric detectors intended for use with a multi-channel THz...
Many currently operating and future FELs can generate broadband radiation at MHz repetition rate, requiring a fast diagnostic tool(response time at least on a single-digit ns scale),ultra-broadband, & robustness. We develop ultrafast-operating THz detectors based on Schottky-diodes, and field-effect transistors (FET)**operating at room temperature.
We present four critical features of our...
In close proximity to the spallation neutron source of the neutron time-of-flight facility n_TOF at CERN, diamond detectors are installed to measure the fast neutron beam. The detectors are located 2.3 m from the center of the spallation target at 100° with respect to the impinging proton beam. The 20 GeV/c proton beam from CERNs Proton Synchrotron (PS) hits the Pb-spallation target with a...
The SPIRAL2 accelerator, designed for high intensity beams (up to 5 mA), needs to evolve for low intensities in order to reach the requirements of the S3 experimental room. This means increasing the operating range of diagnostic monitors including the Beam Position Monitors (BPM). Twenty BPM are installed in the warm sections of the linac to measure positions, ellipticities and phases. The...
We present an improved electro-optic sampling technique that extends the sensitivity and temporal resolution of beam diagnostics beyond conventional limits. Through precise calibration of the detection system, we reconstruct the spatio-temporal profile of the near-field generated by a relativistic electron beam in a ZnTe crystal. This allows for accurate retrieval of the beam’s peak current...
Electro-optic (EO) diagnostics offer non-destructive methods to resolve the longitudinal charge profile of highly relativistic bunches without the need for complex calibrations or ambiguous phase recovery techniques. The most commonly used technique, EO spectral decoding, is favoured for its simplicity, reliability, and straightforward output interpretation. However, its resolution is...
A test bench for commissioning the 324 MHz RF deflectors used in BSMs has been in use for the upgrade project CSNS-II linac. The pulsed 10keV electron beam produced by a Kimball focusable electron gun has been captured by a YAG:Ce screen and imaged by an industrial camera installed vertically right above the view port of the screen after passing through the body of the RF deflector...
In modern low-emittance electron storage rings, precise beam orbit control is crucial to ensure the beam passes through the magnetic center of each high-gradient multipole magnet, with an accuracy of 10 μm or even better. Accurate alignment of a BPM with the center of the neighboring magnet is imperative, a critical requirement for SPring-8-II. With a total of 340 BPMs, efficient beam...
We present voltage and thermal measurements from the first prototype of a stripline BPM intended for the PETRA IV synchrotron ring. The monitor was installed at the PETRA III testbed for evaluation and compared with CST Microwave Studio simulation results. Initial measurements revealed unexpected voltage oscillations and significant heating (~135 °C) which were not reproduced in idealized...
In scanning transmission X-ray microscopy (STXM) beamlines, precise control of X-ray beam position and intensity (I₀) is crucial to minimize imaging artefacts and improve spectral quality. However, limited working distances in STXM setups restrict the integration of conventional diagnostics. To address this, we have developed a center-stop-based Silicon Carbide (SiC) device that integrates...
At the insertion device beamline in SPring-8, a photoelectron emission X-ray beam position monitor that utilizes four tungsten-blade detectors is currently in operation. The horizontal and vertical position sensitivity coefficients (gains) are determined by analyzing the output signals of the four detectors as the monitor body is translated horizontally or vertically, respectively, from the...
Beam Position Monitors (BPMs) are essential diagnostic tools in any particle accelerator, as they provide accurate measurements of the beam's position, phase, and intensity along the accelerator line. Safran Electronics & Defense, Spain is responsible for the complete design, implementation, production, and validation of a BPM electronic system tailored to project-specific requirements....
At the heavy ion accelerator UNILAC at GSI Helmholtz Center for Heavy Ion Research in Darmstadt, measurements were carried out with a Fast Faraday Cup (FFC) in order to precisely measure the time structure of the particle beam. The FFC offers a highly accurate time-resolved recording of the charge distribution along the longitudinal beam profile. The data obtained in combination with a dipole...
The high-precision energy spectrometer, as a key electron beam diagnostic device, is capable of accurately measuring the energy distribution of electron beams, thereby providing essential data for optimizing electron beam injector performance. Simultaneously, the upstream beam collimation also influences the measurement accuracy of the spectrometer. In this context, electron beam injectors...
Solid State X-ray beam position monitors (XBPMs) are an established reality for in-line, real-time monitoring for X-ray beams. Commercial products are available in different materials, such as diamond (CIVIDEC, DECTRIS) and Silicon Carbide (SenSiC GmbH)*. One issue related to this class of devices is the presence of a separation cross in the center of the device, used to obtain four...
Diagonal-cut plane Beam Position Monitors (BPMs) are utilized to measure the transverse position of the proton beam at the Rapid Cycling Synchrotron (RCS) of the CSNS. Custom developed electronics are employed to process signals from the BPMs. Significant transverse beam position offsets were observed at several locations along the RCS. These offsets were attributed to abrupt changes in the...
Electro-optical pickups are being explored at CERN for the development of a high-bandwidth beam position monitor capable of measuring intrabunch beam position. To support this effort, a prototype electro-optical beam position monitor has been installed in the SPS. The installation utilises a fibre-coupled laser directed into lithium niobate crystals. As the beam passes a crystal, its...
Optical beam diagnostics, such as OTR screens and streak cameras, can overcome bandwidth limitations of electronic diagnostics. However, efficient light collection and transport is challenging. At the PEER (Pulsed Energetic Electrons for Research) facility at the Australian Synchrotron (AS), we use Cherenkov radiation (CR) generated in optical fibers to reconstruct longitudinal bunch profiles...
Accurate measurement of the longitudinal profile, or bunch length, of particle beams is essential for evaluating and optimizing beam quality in the Advanced Photon Source Upgrade (APS-U) Storage Ring. While Beam Position Monitor (BPM) signals are typically used for precise position measurements, they also contain information about the longitudinal bunch distribution, convolved with the BPM...
The longitudinal phase space characterization of electron bunches plays a crucial role in operational optimization of accelerator facilities. Currently, the terahertz free-electron laser (THz-FEL) facility at Huazhong University of Science and Technology (HUST) uses a combined deflecting cavity and dipole magnet system for longitudinal phase space measurements of bunches. In order to achieve...
The Electron-Ion Collider is being constructed at the Brookhaven National Laboratory. The crab cavities will be utilized for the increase of the luminosity. While the initial set-up of crab cavities can be based on the orbit measurements during dedicated development time, we need to utilize a less invasive approach for monitoring the longitudinal beam tilt during operations. We propose to...
Modern BPM processors utilize digital processing of the beam induced signals. The information on the signal amplitudes is used for the delta over sum calculation of the beam position, while the readily available phase information is usually discarded. We have experimentally tested measurement of the individual positions of two beams propagating in the common beampipe utilizing both phase and...
Photon Beam Position Monitors (pBPM) detect photon beam intensity and position in synchrotron light sources and are capable to operate in real time during experiments, without altering beam properties and ideally discriminating between insertion device (ID) and bending magnet (BM) radiation. Early approaches used metallic blades based on photoemission from beam tails, but failed with...
Free electron lasers (FEL), which can generate ultra-high brightness rediation are working horses for radiation science research over the world. For FEL, the higher the repetition frequency of the beam in the device, the higher the user's experimental efficiency, and more experimental stations can conduct experiments simultaneously. Therefore, there is a trend to increase the repetition...
This work presents the development and characterization of PCR4, a novel pico-to-milli ammeter jointly developed by STLab srl and SenSiC GmbH, specifically designed for applications requiring high-current readout, allowing for monochromatic and polychromatic beams measurement. PCR4 features four independent channels, each with 24-bit resolution, a 10 kHz sampling rate, and an ultra-wide...
Transverse beam position is one of the most critical parameters in accelerator commission and operation. As non-invasive diagnostic devices, beam position monitors (BPMs) are the main “workhorse” in accelerators, providing beam center of mass position information. The position conversion factor (K-factor) of BPM systems constitutes a fundamental determinate of measurement accuracy. While...
As the China Spallation Neutron Source (CSNS) Phase II project increases the Rapid Cycling Synchrotron (RCS) power to 500 kW, the signal intensity of Beam Position Monitors (BPMs) is expected to rise tenfold, necessitating a comprehensive upgrade of the electronics system to meet high-power operational requirements. Drawing on the experience of the J-PARC Main Ring (MR) 1.3 MW power upgrade,...
Diamond-II is a major upgrade to the current synchrotron facility, Diamond Light Source. The low emittance electron beam requires more stable, low drift beam position monitor electronics which are also essential for the Fast Orbit Feedback system. This paper presents measured and simulated results of the analog frontend for the electron beam position monitors. This work aims to deliver an...
The J-PARC MR achieved its initial target of 750 kW operation and is currently upgrading its equipment to reach the next target of 1.3 MW. The Beam Position Monitor (BPM) must enhance position accuracy to less than one-third of that of the current system to mitigate beam losses caused by accelerating the high-intensity proton beam of 3.3E14ppp. To address this, a new Data Acquisition System...
A novel photo-emission type of X-ray Beam Position Monitor (PheM XBPM) for the ‘white’ undulator radiation was proposed [1]. After that a prototype was designed and manufactured at the MAX IV. Two PheM XBPMs were installed at the SoftiMAX and CoSAXS frontends of the MAX IV R3 storage ring. Performance results of the PheM XBPM prototype will be presented.
[1]....
Steady-state microbunching (SSMB) is a proposed scheme to generate coherent radiation at short wavelengths from a microbunched electron beam in a storage ring. The feasibility of the idea is investigated in an ongoing proof-of-principle (PoP) experiment conducted at the Metrology Light Source (MLS). Phase I of the SSMB PoP experiment has been using an experimental setup employing a single-shot...
The Electron Ion Collider (EIC) Hadron Storage Ring (HSR) aims to leverage the hardware from the RHIC storage ring as much as possible. However, the RHIC stripline beam position monitors (BPM) used in the superconducting magnet cryostat will not be compatible with the planned EIC hadron beam parameters that include shorter bunches, higher beam current and operation of the beam with a radial...
In the framework of the recent FLASH2020+ upgrade program, the longitudinal electron beam diagnostics of the FLASH accelerator had been modernized and extended by additional devices, including an electro-optical bunch length detector (EOD[]), as well as an additional bunch compression monitor (BCM []) and a bunch arrival-time monitor (BAM [**]) in the new direct seeding beamline FLASH1. ...
For the HESR diagonally cut BPMs were designed, with 64 manufactured and tested with a purpose-built BPM test-stand. This test-stand had to host BPMs of various lengths, the overall length of the complete vacuum system varies from 450 mm to 1585 mm. For all BPMs several properties, e.g. the geometric factors or the electrical center in relation to the geometric center, were measured utilizing...
To surpass limitations in sub-picosecond electro-optic electron bunch length diagnostics[1], we present an innovative detection method utilizing diversity schemes[2].
This approach employs simultaneous multi-output measurements of the chirped optical probe modulated by the electron bunch's field. We introduce a novel inversion algorithm that automatically recognizes and compensates for...
The development of longitudinal diagnostics for short-pulse electron accelerators is challenging but necessary to provide high-brightness electron bunches. This is equally true for novel plasma accelerators as for free electron lasers. The gold standard for such measurements is a transverse deflecting cavity (TDC), but these are typically invasive, are costly to produce and operate, and have...
We will give an overview of the Smith-Purcell and transition radiation based longitudinal diagnostic methods employed at the ARES (Accelerator Research Experiment at SINBAD) linear accelerator to characterize femto-second long electron bunches.
The Smith-Purcell radiation mechanism has been studied for the case of metallic gratings, but not much experimental data has been published yet with...
SOLEIL II is the low emittance upgrade project for Synchrotron SOLEIL, targeting an emittance of ~80 pm.rad.
The new lattice includes 196 Beam Position Monitors (BPM) distributed in 3 different types depending on the vacuum chamber diameter.
To ensure consistent signal levels across varying pipe diameters, two button sizes were selected: 6 mm diameter for 16 mm beam pipes, and 7 mm diameter...
Our heavy ion beams are slow, short, and thick. For such beams, spiral beam position monitors(BPMs) are expected to provide good linearity and multiple information readouts despite their small size. At the RIKEN Nishina Center, various ion beams are accelerated using linacs and cyclotrons. However, the beams handled are slow enough compared to relativistic speeds, the bunch length is only...
The electron-positron Future Circular Collider (FCC-ee) has challenging requirements for beam instrumentation, including the need for thousands of high-resolution beam position monitors (BPMs) presenting low impedance to the circulating beam. This paper details the requirements for the FCC-ee arc BPMs and presents the simulation results of BPM button pickups with various geometries modelled...
Information on the longitudinal phase space (LPS) is essential for tuning injectors that deliver a few-femtosecond electron bunches to beam–plasma interaction experiments and ultrafast diffraction facilities. Direct time–energy characterization, however, is challenging due to the limited resolution of conventional diagnostics. To address this, we apply a tomographic algorithm that uses a...
The IFMIF-DONES facility located at Escúzar in Spain will consist of an accelerator delivering 125 mA of 40 MeV deuterons onto a Lithium target. At the last part of the accelerator, when the beam footprint is almost shaped, different beam diagnostics are considered. In order to protect the machine against changes of the beam and give a safe interlock, a novel RF pickup made of eight electrodes...
The XBPM installed in the TPS frontend determines the center position of the photon beam using four CVD diamond blades. The combination of XBPM and upstream/downstream EBPM readings of the insertion device enables verification of the photon beam’s alignment along the correct trajectory. Significant changes in the beam position or profile, as well as prolonged periods without recalibration, may...
The AWAKE facility at CERN utilises proton beam-driven plasma wakefields to accelerate electron bunches in a 10-meter long rubidium plasma cell. Precise monitoring of the electron bunches in the presence of the more intense proton bunches, which have distinct temporal and spatial characteristics, requires a beam position monitor (BPM) operating in the tens of GHz frequency range, assuming...
As part of the ongoing Full-Energy Beam Exploitation (FEBE) upgrade to the CLARA accelerator at Daresbury, few-fs optical synchronisation between the new Ti:Sapphire terawatt FEBE laser and the Er:Yb optical master oscillator (OMO) is required for user experiments. To achieve this, a fibre-based two-colour balanced optical cross-correlator (BOXC) using waveguided periodically-poled lithium...
X-ray beam position monitors (XBPMs) play a crucial role in accurately measuring the position of the white beam in synchrotron front ends. Traditional XBPM designs typically feature four tungsten blades arranged at the full width at half maximum (FWHM) of the white beam. However, the high absorption and lower thermal resistance of tungsten limit the proximity of the blades to the X-ray source,...
This paper reports on the design and operational experience of an electro optical sampling (EOS) diagnostics based on the same femtosecond laser used for the seeding process of the FERMI FEL2. This design allows operating in parallel with the FEL2, minimizing time jitter with respect to the seed laser which is the main time marker of the FEL process by removing the time jitter contributions...
In this study we present an extensive theoretical investigation, and lateral resolution optimization, into the use of semiconductor-based sensors (semicon-sensors) for real-time monitoring of high-intensity synchrotron whitebeams. Leveraging internal photoemission, these sensors can give critical advantages over conventional metal-based blade monitors that rely on *surface...
The High Current Injector features normal-conducting RF Linac structures intended to accelerate various ion species with a mass-to-charge ratio of up to 6, achieving a maximum output energy of 1.8 MeV/u. It can deliver an intense analyzed beam up to 100pnA at the target. To preserve the beam quality at the target and to improve the performance of RF cavities and beam transmission, both...
The ELSA facility at the University of Bonn uses a storage ring to accelerate polarized electrons up to 3.2 GeV. To monitor the polarization degree of the stored beam a Compton polarimeter is used to analyze the profile of the back-scattered beam of gamma rays. In addition to a silicon microstrip detector with vertical resolution, state-of-the-art pixel detectors are tested for both,...
We report progress on a THz streaking experiment at the UCLA Pegasus Laboratory enabling femtosecond-resolution electron bunch length measurements. Single-cycle, 50 µJ THz pulses centered at 0.6 THz are coupled into a metallic horn structure, enhancing field strengths to several hundred MV/m while simultaneously establishing boundary conditions for a strong streaking gradient. A...
The FELiChEM is a user facility dedicated for energy chemistry research, developed at University of Science and Technology of China in Hefei. The beam position diagnostics system at FELiChEM are upgraded recently. The facility operates with a special mode: macropulses at 1 Hz repetition rate with microsecond duration, each containing micropluses at 59.5 MHz repetition rate. The key advancement...
Energy-recovery linacs provide high beam currents with low externally provided RF power compared to conventional linacs while maintaining high beam quality. The S-DALINAC is a multiple recirculating accelerator operating with a frequency of 3 GHz. It can be operated as a multi-turn superconducting energy-recovery linac *. The bunch length is suspected to limit the efficiency of this operation...
A novel soft X-ray BPM (sXBPM) for high-power white beams of synchrotron undulator radiation has been developed through a joint effort by BNL/NSLS-II and Stony Brook University. In this approach, custom-made multi-pixel GaAs detector arrays are positioned in the outer portions of the X-ray beam, with beam position inferred from the pixel photocurrents. The first R&D device, installed in the...
