RIA Superconducting Drift Tube Linac R & D

Abstract

Cavity and cryomodule development work for a superconducting ion linac has been underway for several years at the National Superconducting Cyclotron Laboratory. The original application of the work was the proposed Rare Isotope Accelerator. At present, the work is being continued for use with the Facility for Rare Isotope Beams (FRIB). The baseline linac for FRIB requires 4 types of superconducting cavities to cover the velocity range needed to accelerate an ion beam to ≥ 200 MeV/u: 2 types of quarterwave resonator (QWR) and 2 types of half-wave resonator (HWR). Superconducting solenoids are used for focussing. Active and passive shielding is required to ensure that the solenoids' field does not degrade the cavity performance. First prototypes of both QWR types and one HWR type have been fabricated and tested. A prototype solenoid has been procured and tested. A test cryomodule has been fabricated and tested. The test cryomodule contains one QWR, one HWR, one solenoid, and one super-ferric quadrupole. This report covers the design, fabrication, and testing of this cryomodule.

Superconducting shielding with Pb and Nb tubes for momentum sensitive measurements of neutral antimatter

“…The SC tubes are investigated experimentally and via simulations on their property of shielding external magnetic fields. Shielding magnetic fields with SC have been studied for SC Pb cans in [2] and investigated for the application of SC linear accelerators as a Nb can in [3][4][5] and for bulk and thin layers of Pb, Cu and In in [6]. High-Tc SC shields have been studied in [7] and for the application of SQUID sensors in [8].…”