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Design of an Emittance Compensation Superconducting Magnet Package for LCLS-II-HE's SRF Photo-Injector

Journal Article · · IEEE Transactions on Applied Superconductivity
 [1];  [2];  [3];  [3];  [3];  [2];  [3]
  1. Michigan State University, East Lansing, MI (United States); SLAC
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  3. Michigan State University, East Lansing, MI (United States)
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An SRF photo-injector (low frequency, quarter-wave resonator plus emittance compensation magnet) is planned for LCLS-II-HE as it can provide a higher cathode gradient and better electron beam quality than other types of CW electron guns. The magnet package is located immediately downstream of the SRF cavity, and incorporates a solenoid doublet, bucking coils for reduction of the fringe field, normal/skew quadrupoles and horizontal/vertical dipoles. All the magnets are wound of NbTi wire and operate in liquid helium environment. The solenoid package is located inside the SRF gun cryomodule. Design considerations include space limitations, optimal emittance compensation, the magnetic field limits in the superconducting wire and quench protection. The solenoid coils must provide a peak excitation > 25 kgauss 2 ·cm, a fringe field < 20 gauss at the wall of the SRF cavity, an integrated dipole field < 90 gauss·cm and an integrated quadrupole field < 10 gauss. As a result, a genetic algorithm was used to optimize the solenoid design. Correction dipoles and quadrupoles were designed using coil dominated Walstrom style coils.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1984865
Journal Information:
IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 5 Vol. 33; ISSN 1051-8223
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

References (7)

Soft-edged magnet models for higher-order beam-optics map codes journal February 2004
Design of Open High Magnetic Field MRI Superconducting Magnet With Continuous Current and Genetic Algorithm Method journal June 2009
Numerical Analysis on the Quench Process and Protection of Conduction Cooled ${\rm MgB}_{2}$ Magnet journal June 2010
Superconducting Solenoids for RF Accelerators and Electron Guns journal June 2014
Superconducting Solenoid Package Design, Fabrication, and Testing for FRIB journal March 2018
Numerical Analysis on the Quench Process and Protection of Conduction Cooled ${\rm MgB}_{2}$ Magnet journal June 2010
The Linac Coherent Light Source: Recent Developments and Future Plans journal August 2017

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Accelerator magnets: dipoles
Genetic algorithms
Quench Protection
correctors
quadrupoles