Speaker
Description
The LCLS-II at SLAC represents a significant upgrade over its predecessor, introducing advancements in X-ray laser technology to provide a deeper understanding of atomic structures. The commissioning of the linac includes a series of surveys that are performed at different steps while ramping up energy, power and parking beam at different locations of the beamline. This presentation details the findings of the Radiation Physics commissioning of the LCLS-II, structured into two main sections: RF-only operations of the gun and cryomodules & operations with low beam power.
In the first part we focus on radiations produced by RF-only operations. We aim at better understanding the accelerator field emissions and their origin. Field emissions are undesirable electron discharges from the superconducting cavities, which integrate with the main beam, affecting its quality, potentially disrupting the beam's characteristics, and posing risks of radiation hazard as well as to the accelerator's components. The identification and quantification of these emissions are important to design mitigation strategies, enhance operational safety, and optimize the accelerator's beam performance.
The second part is related with low power beams purposely lost at different locations in the accelerator enclosure and associated residual doses.
Through a series of tests in 2022 and 2023, the RP group has collected data by monitoring radiation through different operational modes to validate the adequacy of the designed radiation mitigations and better understand our capacity of measuring radiation from different sources with optical fibers, solid state diamond detectors, ion chambers and average current monitors.
Next phases of LCLS-II commissioning will be related to higher power beams.
This work is supported by the Department of Energy Contract DE-AC02-76SF00515
| Scientific Topic 1 | Source terms, new accelerator facilities and related topics |
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