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--- hv_bias [2014/11/19 12:26]
pereira [HV Manual control]
+++ hv_bias [2015/04/12 13:42]
pereira [HV Remote control]
@@ Line 3: / Line 3: @@
 ===== HV Remote control =====
-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 **Daniel Bazin**.
+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 [[Software#u6pc5 (data U6)|u6pc5]] control computer by clicking in the icon **High Voltage**, or from a Linux terminal by typing ''/usr/bin/wish mpod.tcl'' from directory **/user/s800/Documents/Run/hv**. 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 **Daniel Bazin**.
 {{:wiki:hv-gui.png?700|GUI control panel of the S800 detectors HV}}
+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
 ===== HV Manual control ====

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