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hv_bias [2014/11/19 11:43] pereira [General Information] |
hv_bias [2023/10/12 09:10] noji Updated after the migration from DAQ to EXP network |
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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 high-voltage of the [[Detectors# | + | |
- | {{:wiki:hv-gui.png?700|GUI control panel of the S800 detectors | + | {{:wiki:phoebus_diag_hv.png|CS-Studio Phoebus DIAG HV control}} |
+ | This page can be reached from “FRIB EXP” → “DIAG” (Engineering Area, not to be confused with “S800” → “Diag Main”) → “S800 HV Bias Power Supply”. | ||
+ | Each channel can also be accessed from by going to “FRIB EXP” -> “Power Supplies” and open the “EXP-S3” tab, which looks like the screenshot below. | ||
- | detectors | + | {{: |
- | [[Detectors# | + | The actual |
+ | {{: | ||
+ | Other examples of HV values used with different fragment beams are: | ||
- | ===== Object Scintillator | + | * **CRDC1 and CRDC2**: |
- | The bias for the object scintillator is controlled via the H.V. power supply {{: | + | * 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) | |
- | ===== FP Scintillators ===== | + | * For Ar-34 @ ~80 MeV/u: CRDC1 (Anode=860 V, Drift=1000 V); CRDC2 (Anode=840 V; Drift=1000 V) |
- | 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 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) | |
- | ===== Ion Chamber ===== | + | * For U-238 (88+) @ ~70 MeV/u: CRDC1 (Anode=570 V, Drift=1000 V); CRDC2 (Anode=570 V; Drift=1000 V) |
- | The biases for the anode and the drift electrode are each controlled separately via the S800 Detector HV Control. Parts of this detector rely on the same 12-Volt power supply used to power the bases of the FP Scintillator PMTs. If the vacuum-based interlock condition for protecting the FP Scintillator PMTs is triggered, the 12-Volt power supply will not be available for the Ion Chamber. | + | |
- | + | * **FP scintillator (E1 up and E1 down)**: | |
- | ===== CRDCs ===== | + | * For He-3 @ ~130 MeV/u: UP (1790 V); DOWN (1760 V) |
- | 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 to bias the electrostatic gate (see section [[Detectors# | + | * For Be-12 @ ~30 MeV/u: UP (1770 V); DOWN (1700 V) |
- | ===== TPPACs ===== | + | * For Ar-34 @ ~80 MeV/u: UP (1580 V); DOWN (1510 V) |
- | 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 “classic” PPACs or [[Detectors# | + | * 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 | ||