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hv_bias [2014/11/19 11:32] pereira [General Information] |
hv_bias [2023/10/17 09:40] noji |
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====== Detector bias control ====== | ====== Detector bias control ====== | ||
+ | ===== HV Remote control ===== | ||
- | ===== General Information ===== | + | The high-voltage of the plastic scintillator and the MCP at Object, the [[Detectors# |
- | The [[Detectors# | + | |
+ | {{: | ||
- | {{: | + | This “S800 HV Bias Power Supply” page is linked from both " |
- | ===== Object Scintillator ===== | + | |
- | The bias for the object scintillator | + | |
- | ===== FP Scintillators ===== | + | {{: |
- | Only the fist two scintillators are typically used since in most cases particles do not reach beyond the second detector. The biases for the anode and the drift electrode are each controlled separately via the S800 Detector HV Control. To protect the scintillator PMT bases from damage from discharge under poor vacuum conditions (for example, during a window break on one of the nearby gas detectors), the 12-Volt supply for the PMT bases is interlocked to switch off if the pressure in the focal plane box rises above some minimum value as read by an ion gauge. The ion gauge controller (a black box with an LED digital display) is mounted on the south support structure for the focal plane chamber. | + | |
- | ===== Ion Chamber ===== | + | The ramp rate can be changed in the " |
- | The biases for the anode and the drift electrode | + | |
- | ===== CRDCs ===== | + | Each channel can also be accessed |
- | Each of the two detectors, CRDC1 and CRDC2, has a separate bias control for the anode and the drift electrode via the S800 Detector HV Control. Please keep in mind that a change in the drift voltage of the CRDCs strongly affects the drift velocity of the electrons and a new mask calibration has to be done to be able to determine the y position of particles. Apart from the CRDCs, it is important | + | |
- | ===== TPPACs ===== | + | |
- | The bias of each of the two detectors, PPAC1 and PPAC2 is controlled individually via the S800 Detector HV Control. There are two types of detectors used for the TPPACs: either | + | |
+ | {{: | ||
+ | The actual HV modules are located on the top level of the S3 vault, under the FP chamber. | ||
+ | |||
+ | {{: | ||
+ | |||
+ | Other examples of HV values used with different fragment beams are: | ||
+ | |||
+ | * **CRDC1 and CRDC2**: | ||
+ | * For He-3 @ ~130 MeV/u: CRDC1 (Anode=1120 V, Drift=1000 V); CRDC2 (Anode=1120 V; Drift=1000 V) | ||
+ | * For Be-12 @ ~30 MeV/u: CRDC1 (Anode=970 V, Drift=1000 V); CRDC2 (Anode=970 V; Drift=1000 V) | ||
+ | * For Ar-34 @ ~80 MeV/u: CRDC1 (Anode=860 V, Drift=1000 V); CRDC2 (Anode=840 V; Drift=1000 V) | ||
+ | * For Zn-58 @ ~44 MeV/u: CRDC1 (Anode=740 V, Drift=1000 V); CRDC2 (Anode=740 V; Drift=1000 V) | ||
+ | * For Rb-74 @ ~40 MeV/u: CRDC1 (Anode=650 V, Drift=1000 V); CRDC2 (Anode=650 V; Drift=1000 V) | ||
+ | * For U-238 (88+) @ ~70 MeV/u: CRDC1 (Anode=570 V, Drift=1000 V); CRDC2 (Anode=570 V; Drift=1000 V) | ||
+ | | ||
+ | * **FP scintillator (E1 up and E1 down)**: | ||
+ | * For He-3 @ ~130 MeV/u: UP (1790 V); DOWN (1760 V) | ||
+ | * For Be-12 @ ~30 MeV/u: UP (1770 V); DOWN (1700 V) | ||
+ | * For Ar-34 @ ~80 MeV/u: UP (1580 V); DOWN (1510 V) | ||
+ | * For Zn-58 @ ~44 MeV/u: UP (1400 V); DOWN (1340 V) | ||
+ | * For U-238 (88+) @ ~70 MeV/u: UP (1180 V); DOWN (1280 V) | ||
+ | |||
+ | * **IC**: | ||
+ | * Typically 200 V | ||