2019 EIC User Group Meeting

Development of a Polarized 3He++ Ion Source for the EIC

23 juil. 2019, 11:00

15m

Amphi Friedel (Ecole Nationale Supérieure de Chimie)

Oral presentation Accelerator R&D Parallel session A

Orateur

Matthew Musgrave (MIT)

Description

The capability of accelerating a high-intensity polarized ${}^3$He ion beam would provide an effective polarized neutron beam for the study of new high-energy QCD studies of nucleon structure. This development is essential for the future Electron Ion Collider, which could use a polarized ${}^3$He ion beam to probe the spin structure of the neutron. The proposed polarized ${}^3$He ion source is based on the Electron Beam Ion Source (EBIS) currently in operation at Brookhaven National Laboratory. ${}^3$He gas would be polarized within the 5 T field of the EBIS solenoid via Metastability Exchange Optical Pumping (MEOP) and then pulsed into the EBIS vacuum and drift tube system where the ${}^3$He will be ionized by the 10 Amp electron beam. The goal of the polarized ${}^3$He ion source is to achieve $2.5\times {10}^{11}$ ${}^3$He${}^{++}$/pulse at 70% polarization. An upgrade of the EBIS is currently underway. An absolute polarimeter and spin-rotator is being developed to measure the ${}^3$He ion polarization at 6 MeV after initial acceleration out of the EBIS. The source is being developed through collaboration between BNL and MIT.

Documents de présentation

EICUG_2019-07-23_Musgrave.pdf