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Title: Development of polarized 3He ion source

Abstract

A long history on the polarized 3He ion source developed at RCNP is presented. We started with an 'OPPIS' (Optical Pumping Polarized Ion Source) and later found the fundamental difficulties in the OPPIS. To overcome them an 'EPPIS' (Electron Pumping Polarized Ion Source) was proposed and its validity was experimentally proven. However, a serious technical disadvantage was also found in the EPPIS. To avoid this disadvantage we proposed a new concept, 'SEPIS' (Spin Exchange Polarized Ion Source), which uses an enhanced spin-exchange cross section theoretically expected at low 3He+ incident energies for the 3He+ + Rb system.Next, we describe the present status of the SEPIS development; construction of a bench test device allowing the measurements of not only the spin-exchange cross sections {sigma}se but also the electron capture cross sections {sigma}ec for the 3He+ + Rb system. The latest experimental data on {sigma}ec are presented and compared with other previous experimental data and the theoretical calculations. A design study of the SEPIS for practical use in nuclear (cyclotron) and particle physics (synchrotron) is shortly mentioned.Finally, we mention possibility to polarize ions heavier than 3He as an application of SEPIS. The theoretical calculation showed that {sigma}se comparable to that for themore » 3He+ + Rb is expected for the Li2+ + Rb system, which suggests that the SEPIS will hopefully be a general tool to polarize any heavy ions.« less

Authors:
 [1]; ;  [2];  [3]; ;  [4];  [5]
  1. Department of Clinical Technology, Kobe Tokiwa College, Ohtani-cho 2-6-2, Nagata-ku, Kobe 653-0083 (Japan)
  2. Department of Physics, Graduate School of Science, Osaka University, 1-1, Machikaneyama, Toyonaka, Osaka 560-0043 (Japan)
  3. Department of Physics, Tokyo Institute of Technology, O-okayama 2-12-1, Tokyo 152-8551 (Japan)
  4. Research Center for Nuclear Physics, Osaka University, Mihogaoka 10-1, Ibaraki, Osaka 567-0047 (Japan)
  5. Department of Chemistry, Niigata University, Nino-cho 8050, Niigata 950-2181 (Japan)
Publication Date:
OSTI Identifier:
21056732
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 891; Journal Issue: 1; Conference: 6. Symposium on nuclear physics, Tours (France), 5-8 Sep 2006; Other Information: DOI: 10.1063/1.2713510; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CROSS SECTIONS; ELECTRON CAPTURE; ELECTRONS; HEAVY IONS; HELIUM 3; HELIUM 3 REACTIONS; ION SOURCES; OPTICAL PUMPING; POLARIZED TARGETS; RUBIDIUM 85 TARGET; RUBIDIUM 87 TARGET; SPIN EXCHANGE

Citation Formats

Tanaka, M., Takahashi, Y., Shimoda, T., Yasui, S., Yosoi, M., Takahisa, K., and Shimakura, N. Development of polarized 3He ion source. United States: N. p., 2007. Web. doi:10.1063/1.2713510.
Tanaka, M., Takahashi, Y., Shimoda, T., Yasui, S., Yosoi, M., Takahisa, K., & Shimakura, N. Development of polarized 3He ion source. United States. doi:10.1063/1.2713510.
Tanaka, M., Takahashi, Y., Shimoda, T., Yasui, S., Yosoi, M., Takahisa, K., and Shimakura, N. Mon . "Development of polarized 3He ion source". United States. doi:10.1063/1.2713510.
@article{osti_21056732,
title = {Development of polarized 3He ion source},
author = {Tanaka, M. and Takahashi, Y. and Shimoda, T. and Yasui, S. and Yosoi, M. and Takahisa, K. and Shimakura, N.},
abstractNote = {A long history on the polarized 3He ion source developed at RCNP is presented. We started with an 'OPPIS' (Optical Pumping Polarized Ion Source) and later found the fundamental difficulties in the OPPIS. To overcome them an 'EPPIS' (Electron Pumping Polarized Ion Source) was proposed and its validity was experimentally proven. However, a serious technical disadvantage was also found in the EPPIS. To avoid this disadvantage we proposed a new concept, 'SEPIS' (Spin Exchange Polarized Ion Source), which uses an enhanced spin-exchange cross section theoretically expected at low 3He+ incident energies for the 3He+ + Rb system.Next, we describe the present status of the SEPIS development; construction of a bench test device allowing the measurements of not only the spin-exchange cross sections {sigma}se but also the electron capture cross sections {sigma}ec for the 3He+ + Rb system. The latest experimental data on {sigma}ec are presented and compared with other previous experimental data and the theoretical calculations. A design study of the SEPIS for practical use in nuclear (cyclotron) and particle physics (synchrotron) is shortly mentioned.Finally, we mention possibility to polarize ions heavier than 3He as an application of SEPIS. The theoretical calculation showed that {sigma}se comparable to that for the 3He+ + Rb is expected for the Li2+ + Rb system, which suggests that the SEPIS will hopefully be a general tool to polarize any heavy ions.},
doi = {10.1063/1.2713510},
journal = {AIP Conference Proceedings},
number = 1,
volume = 891,
place = {United States},
year = {Mon Feb 26 00:00:00 EST 2007},
month = {Mon Feb 26 00:00:00 EST 2007}
}
  • New techniques for production of polarized electron, H- (proton), D- (deuteron) and 3He++ ion beams based on optical pumping polarization method are discussed. Feasibility studies of these polarization techniques are in progress at BNL.
  • A long history on the polarized 3He ion source developed at RCNP is presented. We started with an 'OPPIS' (Optical Pumping Polarized Ion Source) and later found the fundamental difficulties in the OPPIS. To overcome them an 'EPPIS' (Electron Pumping Polarized Ion Source) was proposed and its validity was experimentally proven. However, a serious technical disadvantage was also found in the EPPIS. To avoid this disadvantage we proposed a new concept, 'SEPIS' (Spin Exchange Polarized Ion Source), which uses an enhanced spin-exchange cross section theoretically expected at low 3He+ incident energies in the 3He+ + Rb system. Next, we describemore » the present status of the SEPIS development: construction of a bench test device allowing the measurements of not only the spin-exchange cross sections {sigma}se but also the electron capture cross sections {sigma}ec for the 3He+ + Rb system. The latest experimental data on {sigma}ec are presented and compared with other previous experimental data and the theoretical calculations.Finally, a design study of the SEPIS for practical use in nuclear (cyclotron) and particle physics (synchrotron) is shortly mentioned.« less
  • New techniques for the production of polarized electron, H{sup -} (proton), D (D+) and {sup 3}H{sup ++} ion beams are discussed. Feasibility studies of these techniques are in progress at BNL. An Optically Pumped Polarized H{sup -} Ion Source (OPPIS) delivers beam for polarization studies in RHIC. The polarized deuteron beam will be required for the deuteron Electron Dipole Moment (EDM) experiment, and the {sup 3}H{sup ++} ion beam is a part of the experimental program for the future eRHIC (Electron Ion) collider.
  • The goal of the project was to design and construct a source of polarized 3He atoms for injection into EBIS. This is the initial step in producing polarized 3He beams in RHIC in collaboration with physicists from Columbia University and Brookhaven National Laboratory. These beams can be used to probe the spin structure of the neutron in the existing RHIC complex as well as to measure precisely the Bjorken Sum Rule at a future eRHIC electron-ion collider.