Radiation shielding for superconducting RF cavity test facility at A0

Dhanaraj, N.; Ginsburg, C. M.; Rakhno, I.; Wu, Genfa

doi:10.2172/945434

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…Analytical formulae, RF solvers and Monte Carlo codes have been traditionally used 1,2 to address various questions involving dark current from cavities. Generally only a few cavities are simulated and geometries are simplified, or the calculations focus only on beam dynamics.…”

Section: Scheme To Compute Radiation Fields At Lcls-ii Cryomodulesmentioning

confidence: 99%

Studies of radiation fields of LCLS-II super conducting radio frequency cavities

Leitner

et al. 2016

Int. J. Mod. Phys. Conf. Ser.

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The Linac Coherent Light Source II (LCLS-II) will be a hard X-ray Free Electron Laser whose linac can deliver a 1.2 MW CW electron beam with bunch rates up to 1 MHz. To efficiently generate such a high power beam, Super-Conducting Radio-Frequency (SCRF) cavities will be installed in the upstream portion of the existing 3 km Linac at the SLAC National Accelerator Laboratory. The 9-cell niobium cavities will be cooled at 2K inside 35 cryomodules, each containing a string of eight of those cavities followed by a quadrupole. The strong electromagnetic fields in the SCRF cavities will extract electrons from the cavity walls that may be accelerated. Most such dark current will be deposited locally, although some electrons may reach several neighboring cryomodules, gaining substantial energy before they hit a collimator or other aperture. The power deposited by the field emitted electrons and the associated showers may pose radiation and machine protection issues at the cryomodules and also in other areas of the accelerator. Simulation of these effects is therefore crucial for the design of the machine. The in-house code Track3P was used to simulate field emitted electrons from the LCLS-II cavities, and a sophisticated 3D model of the cryomodules including all cavities was written to transport radiation with the Fluka Monte Carlo code, which was linked to Track3P through custom-made routines. This setup was used to compute power deposition in components, prompt and residual radiation fields, and radioisotope inventories.

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Section: Scheme To Compute Radiation Fields At Lcls-ii Cryomodulesmentioning

confidence: 99%

Studies of radiation fields of LCLS-II super conducting radio frequency cavities

Leitner

et al. 2016

Int. J. Mod. Phys. Conf. Ser.

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“…The study was performed using MARS15 Monte Carlo code [5] adopting the results from Fishpact simulations as the source term to provide spatial, energy and angular distributions of field emitted electrons inside the cavity. The study showed the need for additional shielding and as per the recommendations of the radiation safety committee interlocks were placed at the vulnerable locations (shown by simulations) to shut off the RF power in the event of radiation intensity nearing the cut off levels.…”

Section: Radiation Considerationsmentioning

confidence: 99%