First Use of Novel Techniques for Polarized He-3 Targets
- College of William and Mary, Williamsburg, VA (United States)
Spin-exchange optically pumped (SEOP) 3He targets have been successfully used in Hall A at Jefferson Lab as an effective polarized neutron target. Design requirements for E02-013 (Measurement of Sachs form factor Gn E at high Q2) and a recent breakthrough in SEOP target cells suggested several changes to the target. SEOP targets use an optically pumped alkali metal to polarize a noble gas. E02-013 was the first electron scattering target to make use of an alkali metal mixture in place of a single alkali metal. These hybrid cells had a faster polarization time, and a higher overall 3He polarization. The result was a record in-beam polarization for an SEOP polarized 3He target. Previous SEOP targets in Hall A used a holding field supplied by a set of open Helmholtz coils. E02-013 used a magnetic box to provide a uniform magnetic field and to shield the target from the stray magnetic fields produced by the large acceptance open spectrometer placed close to the magnet. Several small polarimetry improvements were made. Innovations were also made to the measurements of the direction and homogeneity of the main holding field. These improvements will be discussed.
- 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:
- 1967325
- Report Number(s):
- JLAB-PHY-07-969; DOE/OR/23177-5923
- Resource Relation:
- Conference: 2007 Annual Meeting of the Division of Nuclear Physics, Newport News, Virginia, October 10–13, 2007
- Country of Publication:
- United States
- Language:
- English
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