A Bulk Superconducting Magnetic System for the CLAS12 Target at Jefferson Lab

Conference · Mon Jun 01 00:00:00 EDT 2015 · IEEE Trans.Appl.Supercond.

DOI:https://doi.org/10.1109/TASC.2015.2388855· OSTI ID:1183169

Statera, Marco ^[1]; Contalbrigo, Marco ^[1]; Ciullo, Giuseppe ^[2]; Lenisa, Paulo ^[1]; Lowry, Michael M. ^[3]; Sandorfi, Andrew M. ^[3]

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1. INFN, Ferrara, Italy
2. Universite di Ferrara, Ferrara, Italy
3. JLAB

A feasibility study of a bulk magnetic system for the target of an experiment to measure the transverse spin effects in semi-inclusive deep inelastic scattering (SIDIS) at 11 GeV with a transversely polarized target using the CLAS12 detector is presented. An experiment has been approved with the highest priority rating to study spin azimuthal asymmetries in SIDIS using 11-GeV polarized electron beams from the upgraded CEBAF facility and the CLAS12 detector equipped with a transversely polarized target. The transverse target in CLAS12 requires the shielding of a volume inside the longitudinal field of the main solenoid. In the shielded region, a transverse target magnet can operate; for the proposed magnetic configuration, the main solenoid maximum magnetic induction is 2 T. A bulk MgB₂ cylinder cooled in liquid helium is proposed both to shield the longitudinal field of the main solenoid and to provide a transverse field induction up to 1.2 T for the hydrogen deuteride ice (HD-ice) target. The installation and magnetization procedure will be described. The magnetization procedure has to be compatible with the polarization and installation procedure of the HD-ice target. The design of a test bench to measure the transverse magnetization of a MgB2 bulk cylinder cooled by a coldhead is presented together with the scheduled measurements.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1183169
• Report Number(s): JLAB-PHY-14-1964; DOE/OR/23177-3358
• Journal Information: IEEE Trans.Appl.Supercond., Vol. 25, Issue 3; Conference: ASC 2014, 10-15 Aug 2014. Charlotte, NC, USA
• Country of Publication: United States
• Language: English

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