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--- hv_bias [2013/12/14 15:47]
pereira [CRDCs]
+++ hv_bias [2014/11/19 11:43]
pereira [General Information]
@@ Line 3: / Line 3: @@
 ===== 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 high-voltage of the [[Detectors#Tracking Parallel Plate Avalanche Counters (TPPAC)|TPPACs]], [[Detectors#Ionization Chamber|Ion Chamber]], the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]], [[Detectors#Plastic scintillators|FP Scintillator]], and [[Detectors#Hodoscope|Hodoscope]] are remotely controlled via GUI control panel (see figure below). The GUI can be opened from the desktop of the u6pc5 control computer. This application allows also to set a maximum limit in the detector current. The voltages of these detectors depend on the Z of the fragments to be measured and their energy. The figure below shows the HV GUI during experiment e10002, which used Si-26 and Al-25 fragments at around 115 MeV/u. These voltages can be used as a reference before starting an experiment. However, the final values will have to be modified during the beam tuning in order to optimize the performance of the detectors. It is convenient to verify the reference values with D. Bazin.
+{{:wiki:hv-gui.png?700|GUI control panel of the S800 detectors HV}}
+detectors
+[[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.
 ===== Object Scintillator =====
@@ Line 15: / Line 25: @@
 ===== CRDCs =====
-Each of the two detectors, [[Detectors#Cathode Readout Drift Chambers (CRDC)|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 effects 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.
+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 =====
-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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