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hv_bias [2013/12/14 15:42] pereira [Object Scintillator] |
hv_bias [2013/12/14 16:03] pereira [TPPACs] |
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===== General Information ===== | ===== General Information ===== |
The [[Detectors#Tracking Parallel Plate Avalanche Counters (TPPAC)|TPPACs]], the [[Detectors#Ionization Chamber|Ion Chamber]], and the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]] have ISEG power supplies run through a single VME-based bias control. The computer interface for this bias control - the S800 Detector HV Control - is typically run on the **devop1** computer in data-U6 and is started by clicking on S800 HV under the Operations option on the taskbar. The [[Detectors#Plastic scintillators|Object scintillator]] and the [[Detectors#Plastic scintillators|FP Scintillator]] are each controlled separately as described below under the sections for each detector. | The [[Detectors#Tracking Parallel Plate Avalanche Counters (TPPAC)|TPPACs]], the [[Detectors#Ionization Chamber|Ion Chamber]], and the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]] have ISEG power supplies run through a single VME-based bias control. The computer interface for this bias control -- the S800 Detector HV Control -- is typically run on the **devop1** computer in data-U6 and is started by clicking on **S800 HV** under the Operations option on the taskbar. The [[Detectors#Plastic scintillators|Object scintillator]] and the [[Detectors#Plastic scintillators|FP Scintillator]] are each controlled separately as described below under the sections for each detector. |
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===== Object Scintillator ===== | ===== Object Scintillator ===== |
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===== CRDCs ===== | ===== CRDCs ===== |
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. | 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#Cathode Readout Drift Chambers (CRDC)|CRDC]]). The power supply is located in the crate to the right of the data-U6; the typical voltage is 26 V. |
===== TPPACs ===== | ===== 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 “classic” PPACs or PPACs with individual strip readouts for handling higher rates. There is not a difference between the two detector types in terms of how the data is used. They do differ in terms of electronics and acquisition. | 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#Tracking Parallel Plate Avalanche Counters (TPPAC)|multi-strip PPACs]] with individual strip readouts for handling higher rates. There is not a difference between the two detector types in terms of how the data is used. They do differ in terms of electronics and acquisition. |
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