10–15 Aug 2025
SAFE Credit Union Convention Center
America/Los_Angeles timezone

Optics Reconstruction in the SCL section of the FNAL Linac

TUP074
12 Aug 2025, 16:00
2h
SAFE Credit Union Convention Center

SAFE Credit Union Convention Center

1401 K St, Sacramento, CA 95814
Poster Presentation MC5 – Beam Dynamics and EM Fields TUP: Tuesday Poster Session

Speaker

Abhishek Pathak (Fermi National Accelerator Laboratory)

Description

The Side-Coupled Linac (SCL) section of the FNAL linac accelerates the beam from 116 MeV to 401.5 MeV, operating at 22-24 mA beam current. Transverse focusing is performed by 32 quadrupoles, and the beam orbit is guided by 19 dipole correctors and measured by 29 BPMs. The bunch length is measured in a single location by a Bunch Shape Monitor (BSM). This paper presents a three-step reconstruction of the machine optics. First, the transverse and longitudinal Twiss parameters at the start of the SCL section are determined using quadrupole scans and BSM measurements at different settings of an upstream cavity. Second, the quadrupole calibrations are adjusted based on differential-trajectory measurements. Finally, the beam is propagated along the SCL linac using the code TraceWin. A comparison between TraceWin simulations and the beam envelope measured by the 12 wire scanners of the SCL linac was performed. Transverse and longitudinal beam parameters at the entrance and exit of the SCL section will be reported.

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Author

Jean-Paul Carneiro (Fermi National Accelerator Laboratory)

Co-authors

Alexander Shemyakin (Fermi National Accelerator Laboratory) Erin Chen (Fermi National Accelerator Laboratory) Abhishek Pathak (Fermi National Accelerator Laboratory) Ralitsa Sharankova (Fermi National Accelerator Laboratory)

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