Conveners
THMR Mini-Orals (MC06, MC09)
- Barry Fishler (SLAC National Accelerator Laboratory)
We present a Secure EPICS PVAccess (SPVA) deployment framework developed at SLAC to enable authenticated, encrypted and authorized access to control systems from external scientific networks. In Phase 1, SPVA has been deployed to connect HPC clients and services on SLAC’s Scientific External Network to internal PVAccess gateways supporting production accelerators.
SPVA enforces strong mutual...
The relationships of diffraction momentum coordinates with Cartesian position coordinates at User Facility beamlines with EPICS controls is discussed. The EPICS IOC computes relations between real space and reciprocal diffraction space motors for various four circle and six circle diffractometer geometries. Development on trajectory previews, collision detection, and on-board scan...
HEPS (High Energy Photon Source) will be the first high-energy (6 GeV) synchrotron radiation light source in China, which is mainly composed of accelerator, beamlines and end-stations. Phase I of the project includes 14 user beamlines and one test beamline. Construction of HEPS began in June 2019 and is scheduled for completion in late 2025. Meanwhile, beamlines have completed photon beam...
The Linac Coherent Light Source (LCLS) at SLAC National Accelerator Laboratory is a pioneering X-ray free-electron laser that provides researchers with the ability to investigate matter at atomic and molecular scales with unprecedented temporal and spatial resolution. Its applications span a wide range of scientific disciplines, including materials science, chemistry, biology, and physics.
A...
The LCLS-II optical delivery system supports multiple interaction points across multiple experiment hutches using only a handful of laser sources. This reduces financial burden and space usage at the cost of increased complexity for the optical laser systems. To ameliorate this complexity, each interaction point is supplied with a Modular Optical Delivery System (MODS) to inject, shape, and...
Beamline Experiment Control (BEC) has become the standardized high-level user interface for data-acquisition orchestration, adopted by nearly all beamlines. Built on a distributed server-client architecture, BEC seamlessly integrates with the underlying EPICS control system at Swiss Light Source (SLS), yet can also be used to steer and configure non-EPICS devices through Bluesky’s hardware...
The high X-ray flux at fourth generation synchrotron facilities enables high quality data acquisition with short detector integration times. Experiments whose durations were previously dominated by detector integration are thus increasingly dictated by the time required for motorized motion. In particular, experiments performed in a step-wise fashion — where motion is stopped during each...
At LCLS, EPICS plays a central role in our controls architecture. IOCs are used to interface directly or indirectly with almost all experimental hardware supporting our heterogenous requirements. EPICS network protocols are used for making devices available over network, data acquistion, and security and safety of devices. These ultimately enable a rich environment of controls tools built...
For soft X-ray spectroscopy beamlines, delay line detectors are often the main system for detecting the photons from the sample and hence also a component determining the overall beamline performance as it might be a limiting factor of both measurement speed, noise, artifacts, and resolution. As such, and even more with larger micro channel plate driven delay line detectors, the signal readout...
X-ray absorption spectroscopy (XAS) is one of the techniques that require multiple beamline devices to operate in tight synchronization to maximize beam flux, focus, and reliable measurements. These devices, such as the undulator, monochromator, quarter-wave plate, and detectors, exhibit a variety of behaviors, phenomena, capabilities, and controller platforms, ranging from the photon source...
The newly enhanced LCLS-II X-ray laser at SLAC National Accelerator Laboratory represents a major advancement in X-ray science, providing unprecedented capabilities for probing ultrafast dynamics in chemistry, materials science, biology, and beyond. Among the new beamlines, the Resonant Inelastic X-ray Scattering (RIX) beamline leverages the high repetition rate of LCLS-II to investigate the...