Installation of an on‐line Lamb shift spin‐filter polarimeter in the Triangle Universities Nuclear Laboratory atomic beam polarized ion sourcea)
| Autor: | Thomas B Clegg, A. J. Mendez, C. D. Roper, J. D. Dunham |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Review of Scientific Instruments. 67:3073-3081 |
| ISSN: | 1089-7623 0034-6748 |
| Popis: | An atomic beam polarized ion source, used heavily since 1989 for producing polarized H± and D± beams for experiments between 25 keV and 20 MeV, have been modified to accept a Lamb–shift, spin–filter polarimeter. In this source, polarized ground‐state H or D atoms enter an electron cyclotron resonance ionizer where they are stripped to produce an outgoing positive polarized ion beam. When negative ions are desired, cesium vapor is introduced into a downstream charge‐exchange canal. The polarimeter, based on an atomic physics concept first developed to produce nuclear–spin‐polarized beams at Los Alamos, is designed to monitor the polarization of 2S1/2 metastable H or D atoms emerging from this cesium canal. Metastable 2S1/2 atoms created by electron pickup in a collision with cesium are ‘‘filtered’’ by the polarimeter according to a magnetic substate, as the magnetic field imposed on the polarimeter cavity is tuned between 53 and 61 mT. Photons produced by subsequent quenching of these filtered atoms to the... |
| Databáze: | OpenAIRE |
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