Polarized Hydrogen-Deuteride (HD) Target for Strangeness Production Experiments at SPring-8/LEPS
| Autor: | Su-Yin Wang, 王素音 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 The polarized Hydrogen-Deuteride (HD) target is developed mainly for the study of φ meson photoproduction on the proton and neutron. Using the polarized target, one can measure double polarization asymmetries to study s¯s-content in the nucleon. We produced a polarized HD target for the first time in 2008. After the aging time of 53 days at 17 Tesla and at 14 mK, the polarization degree (P) and the relaxation time (T1) of the hydrogen (H) and deuterium (D) in the HD were measured by using the NMR method. The polarization degrees measured are much lower than those expected from the thermal equilibrium state of the aging condition. Non-linear relation between the NMR signal height and the polarization degree is considered to be the main source of the low polarization degree. The relaxation time in the SC and TC condition are found to be long enough for the need of staying time during the transportation of the HD target. The relaxation time in the IBC condition is also long enough to produce the other new polarized HD target for replacement in continuous experiments. We plan to start production of HD and move it to SPring-8/LEPS and carry out a performance check by using circularly polarized photon beams in 2010. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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