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Design Study of a Superconducting Quadrupole Magnet System Sustainable Under Dark Current Heating in ILC Main Linac

Journal Article · · IEEE Trans.Appl.Supercond.
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. KEK, Tsukuba
  2. Fermilab
+ Show Author Affiliations
The International Linear Collider (ILC) main linac comprises a series of 12 m-long cryomodules. The cryomodule contains eight 9-cell superconducting (SC) RF (SRF) cavities and an SC quadrupole magnet combined with dipole correctors to focus and steer electron and positron beams. The magnets are installed between the SRF cavity string and at the longitudinal center of a common cryomodule/cryostat. These magnets are conductively cooled by pure aluminum channels thermally connected to a 2 K two-phase helium pipe for cooling the SRF cavities. A recent study shows that field-emitted electrons, so-called “dark current” initiated in the SRF cavities, are transmitted through the SRF cavity string and reach the SC magnet. The energy is inevitably absorbed in the SC coil due to the magnetic field, resulting in risks of a quench caused by the coil heating. We are investigating alternate magnet designs by using Nb$$_{3}$$Sn or $$\text{MgB}_{2}$$SC and by adding the dark current absorber surrounding the beam-pipe to realize sustainable magnet operation under the dark current heating. We report the design study of the magnet system and interfaces to the cryomodule accommodating it with the SRF cavities.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
DOE Contract Number:
AC02-07CH11359
OSTI ID:
2426464
Report Number(s):
FERMILAB-PUB-23-193-TD; oai:inspirehep.net:2653546
Journal Information:
IEEE Trans.Appl.Supercond., Journal Name: IEEE Trans.Appl.Supercond. Journal Issue: 5 Vol. 33
Country of Publication:
United States
Language:
English

References (6)

Superconducting Splittable Quadrupole Magnet for Linear Accelerators journal June 2012
Cryogenic performance of a conduction-cooling splittable quadrupole magnet for ILC cryomodules conference January 2014
Study on Conduction Cooling of Superconducting Magnets for the ILC Main Linac journal September 2022
Performance of Conduction Cooled Splittable Superconducting Magnet Package for Linear Accelerators journal June 2016
The International Linear Collider Technical Design Report - Volume 3.II: Accelerator Baseline Design report June 2013
Conduction Cooling Test of a Splittable Quadrupole for ILC Cryomodules journal June 2013

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