差分
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| 両方とも前のリビジョン前のリビジョン次のリビジョン | 前のリビジョン | ||
| research:memos:gr:gr_memo [2017/12/05 21:50] – kobayash | research:memos:gr:gr_memo [2022/05/21 21:28] (現在) – kobayash | ||
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| ==== Preparation ==== | ==== Preparation ==== | ||
| + | |||
| + | === A/C === | ||
| + | * Call OGFA sfatt (ext.: 8890) | ||
| === VDCs === | === VDCs === | ||
| 行 8: | 行 11: | ||
| * Check if the fans are turned on or not | * Check if the fans are turned on or not | ||
| * The threshold of VDC HV supply is 40 uA for the proton beam at 300 MeV at E483 and E377+E422 | * The threshold of VDC HV supply is 40 uA for the proton beam at 300 MeV at E483 and E377+E422 | ||
| + | * The GR VDC threshold 4 uA --> 20 uA (sometimes 40 uA is used for 0 deg. exp.) | ||
| === Viewers === | === Viewers === | ||
| 行 116: | 行 120: | ||
| - Q1-magnet defocus with the sieve slit and the carbon target | - Q1-magnet defocus with the sieve slit and the carbon target | ||
| ==== Restrictions ==== | ==== Restrictions ==== | ||
| - | * p 400 MeV - 10 nA at SC-FC | + | * p 400 MeV - 10 nA (better less few nA) at SC-FC |
| * p 300 MeV - 20 nA at SC-FC | * p 300 MeV - 20 nA at SC-FC | ||
| + | * 3He 420 MeV - 10 pnA at D1-FC (maybe too high) | ||
| + | * | ||
| ==== E404 ==== | ==== E404 ==== | ||
| * Beam transportation | * Beam transportation | ||
| 行 143: | 行 149: | ||
| * Dispersion matching tuning : 6 hours | * Dispersion matching tuning : 6 hours | ||
| * In total 9 hours or something | * In total 9 hours or something | ||
| + | * The Q magnet of the WS magnet should not be changed for the dispersion matching | ||
| + | * The horizontal size of the beam spot at the target can not be narrow | ||
| + | |||
| + | |||
| + | |||
| + | |||
| + | |||
| ==== Resolutions ==== | ==== Resolutions ==== | ||
| * Achromatic mode | * Achromatic mode | ||
| - | * p 300 MeV : 60-100 keV | + | * p 295 MeV : 60-100 keV (FWHM) |
| - | * 12C 1200 MeV : 240 - 400 keV | + | * p 392 MeV : 80 keV (FWHM), best resolution |
| + | * 12C 1200 MeV : 240 - 400 keV (FWHM) | ||
| ==== For 12C beam at 250 MeV (E404, Tsumura-san' | ==== For 12C beam at 250 MeV (E404, Tsumura-san' | ||
| 行 166: | 行 180: | ||
| * Keep the GR and LAS chambers vacuum | * Keep the GR and LAS chambers vacuum | ||
| * isobutane is used also by EN (but GR- and LAS-VDCs are the main users) | * isobutane is used also by EN (but GR- and LAS-VDCs are the main users) | ||
| + | * Right-hand system for GR and LAS | ||
| + | * Q1-FC angle coverage: 0 - ~20 deg. | ||
| + | |||
| + | |||
| - | ==== E483 ==== | ||
| - | * VDC threshold 4 uA --> 20 uA (sometimes 40 uA is used for 0 deg. exp.) | ||
