Polarized 3He++ ion source development (based on injection of polarized ions by MEOP in the EBIS) for future EIC (Electron Ion Collider) at BNL
Seminars
VBLHEP Specialized seminar
A. M. Baldin Relativistic nuclear physics and polarisation phenomena #804
Date and Time: Wednesday, 1 March 2023, at 11:00 AM
Venue: VBLHEP Conference Hall (building 3), the Veksler and Baldin Laboratory of High Energy Physics, online on Volna
Seminar topic: “Polarized 3He++ ion source development (based on injection of polarized ions by MEOP (Metastability Exchange Optical Pumping technique) in the EBIS) for future EIC (Electron Ion Collider) at BNL”
Speaker: A. N. Zelenski (MIPT)
Abstract:
The proposed polarized 3He++ acceleration in RHIC and future electron-ion collider (EIC) will require about 2∙1011 ions in the source pulse. A new technique had been proposed for production of high intensity polarized 3He++ ion beam. It is based on ionization and accumulation of the 3He gas (polarized by optical-pumping and metastability-exchange technique in the high magnetic field of a 5.0 T) in the Electron Beam Ion Source (EBIS). A novel 3He cryogenic purification and storage technique was developed to provide required gas purity. An original gas refill and polarized 3He gas injection to the EBIS long drift tubes (which serves as the storage cell) were developed to ensure polarization preservation. The laser system for optical pumping and polarization measurements in the high 3-5 T field is described. The 3He polarization 80-85% (and sufficiently long ~ 30 min relaxation time) was obtained in the “open” cell configuration with refilling valve tube inlet. The development of the spin-rotator and absolute nuclear polarimeter based on 3He + 4He scattering (at 6 MeV 3He++ beam energy) is also presented.