差分
このページの2つのバージョン間の差分を表示します。
| 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 04:09] – kobayash | research:memos:gr:gr_memo [2022/05/21 21:28] (現在) – kobayash | ||
|---|---|---|---|
| 行 2: | 行 2: | ||
| ==== Preparation ==== | ==== Preparation ==== | ||
| + | |||
| + | === A/C === | ||
| + | * Call OGFA sfatt (ext.: 8890) | ||
| === VDCs === | === VDCs === | ||
| 行 7: | 行 10: | ||
| * Check if the preamps are turned on or not | * Check if the preamps are turned on or not | ||
| * 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 GR VDC threshold 4 uA --> 20 uA (sometimes 40 uA is used for 0 deg. exp.) | ||
| === Viewers === | === Viewers === | ||
| 行 92: | 行 97: | ||
| - Au target has some excited states at low energy. This looks a child of the beam? | - Au target has some excited states at low energy. This looks a child of the beam? | ||
| - Changing the beam line setting takes time longer than 30 minutes (Nebiki-san & Furutaka-san) | - Changing the beam line setting takes time longer than 30 minutes (Nebiki-san & Furutaka-san) | ||
| - | | + | |
| - Optimization of beam energy resolution with the Au target (dispersion matching mode) | - Optimization of beam energy resolution with the Au target (dispersion matching mode) | ||
| - This optimization should be done after the tuning for achromatic mode | - This optimization should be done after the tuning for achromatic mode | ||
| - | - The is 20-30 keV (FWHM) for proton 295 MeV (the best value is 14 keV (FWHM)) | + | - The goal is 20-30 keV (FWHM) |
| + | - The goal is 15 keV (FWHM) without a target for proton faint beam at 295 MeV | ||
| - Change the GR angle from 8.5 degree to 0 degree | - Change the GR angle from 8.5 degree to 0 degree | ||
| - | - SC FC is down | + | - SC-FC is down |
| - Faint beam | - Faint beam | ||
| - The beam is centered (0 mm) in GX | - The beam is centered (0 mm) in GX | ||
| - Check the resolution (30 keV (FWHM) at GX of 0 mm, 25 keV (FWHM) at GX of -400 mm at E377 and E422 on Dec. 5, 2017) | - Check the resolution (30 keV (FWHM) at GX of 0 mm, 25 keV (FWHM) at GX of -400 mm at E377 and E422 on Dec. 5, 2017) | ||
| + | - Y focus by changing the QM10 with Au target | ||
| + | - Target Au --> blank | ||
| + | - QM10UDD optimization - First UD-M table which can realize good Y focus should be made | ||
| + | - UD (A) / M (A) / dE (keV) | ||
| + | - 25.50 / -41.20 / 31 keV | ||
| + | - 25.70 / -41.41 / keV | ||
| + | - 25.90 / -41.41 / keV | ||
| + | - 26.10 / -41.41 / keV | ||
| + | |||
| - Q1-magnet focusing with the sieve slit and the carbon target | - Q1-magnet focusing with the sieve slit and the carbon target | ||
| - Q1-magnet defocus with the sieve slit and the carbon target | - Q1-magnet defocus with the sieve slit and the carbon target | ||
| + | ==== Restrictions ==== | ||
| + | * p 400 MeV - 10 nA (better less few 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 130: | 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 153: | 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.) | ||
