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| 71. |
The production of polarized negative ion beams by ‘‘collisional pumping’’ |
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AIP Conference Proceedings,
Volume 111,
Issue 1,
1984,
Page 754-762
L. W. Anderson,
S. N. Kaplan,
R. V. Pyle,
L. Ruby,
A. S. Schlachter,
J. W. Stearns,
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摘要:
The production of polarized negative ion beams by ‘‘collisional pumping’’ is described. Collisional pumping utilizes repeated charge changing collisions in a thick electron‐spin‐polarized gas or vapor target to form a polarized fast atom beam. The polarized fast atom beam is then partially converted into a polarized negative ion beam in a vapor target. Analysis is presented for a hydrogen beam passing through either a thick polarized H atom target or a thick polarized alkali target. Large polarizations and large currents may be possible.
ISSN:0094-243X
DOI:10.1063/1.34403
出版商:AIP
年代:1984
数据来源: AIP
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| 72. |
Generation of intense polarized beams by selective neutralization of negative ions |
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AIP Conference Proceedings,
Volume 111,
Issue 1,
1984,
Page 763-768
A. I. Hershcovitch,
E. A. Hinds,
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PDF (264KB)
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摘要:
A novel scheme is proposed. This method is based on selective neutralization by laser of negative hydrogen ions in a magnetic field. This selectivity is based on the fact that the final state of the neutralized atom depends on nuclear polarization in the magnetic field. A two‐scenario approach is to be followed: one in which the resulting neutral atom is in the ground state, and in the other the neutral atom is in the n=2 level. Limiting factors are discussed. The main advantages of this scheme are the availability of multi‐ampere negative ion sources and the possibility to neutralize negative ions with very high efficiency.
ISSN:0094-243X
DOI:10.1063/1.34404
出版商:AIP
年代:1984
数据来源: AIP
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| 73. |
Optically pumped polarized H−ion source |
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AIP Conference Proceedings,
Volume 111,
Issue 1,
1984,
Page 769-778
Y. Mori,
K. Ikegami,
A. Takagi,
Z. Igarashi,
S. Fukumoto,
W. Cornelius,
R. York,
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PDF (202KB)
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摘要:
Optically pumped polarized H−ion source has been developed for the 12 GeV proton synchrotron at KEK. Sodium atoms are electron‐spin polarized by two single frequency dye lasers. Protons, which are yielded by an ECR ion source, receive the polarized electrons from the sodium atoms and are polarized by conventional zero‐crossing method. The hydrogen atoms become H−ions by charge‐exchange reaction with sodium vapor. Beam intensities and polarizations so far achieved are 15 &mgr;A with 60 % and 25 &mgr;A with 40 % at 350 keV. The intensity increases recently to 30 &mgr;A and the beam is accelerated to 20 MeV by the linac and injected in the 500 MeV booster synchrotron. The polarization is 45∼56 % at 20 MeV.
ISSN:0094-243X
DOI:10.1063/1.34405
出版商:AIP
年代:1984
数据来源: AIP
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