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--- hv_bias [2014/12/04 18:25]
pereira [HV Remote control]
+++ hv_bias [2019/01/23 13:44]
pereira
@@ 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 [[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**.
+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 log in as s800 user and clicking in the icon **High Voltage**, or from a Linux terminal (again, log in as s800 user) by typing ''/usr/bin/wish mpod.tcl'' from directory **/user/s800/Documents/Run/s800mpod**. 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.
 {{: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 ====
 Apart from the detectors listed above, the voltages of the [[Detectors#Plastic Scintillators|object scintillator]]
- and the **electrostatic gate** of the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]] are adjusted manually.
+ and the electrostatic gate of the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]] are adjusted manually.
 The bias for the object scintillator is controlled via the H.V. power supply {{:wiki:Manual_Canberra_HV_3002D.pdf|Canberra model 3002 D}} located in the crate to the right of the data-U6 (see figure below). The voltage will be adjusted at the beginning of the experiment. This scintillator has to be turned off or put on "standby" when entering the vault due to its sensitivity to light. The voltage used for this detector depends on the fragment nuclei that will be measured. Check with **Daniel Bazin** for a reference value.
-In order for the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]] to work, it is necessary to bias their **electrostatic gate**. This is done via the H.V. Tennelec power supply located on the left side of the object-scintillator Canberra power supply (see figure below). The typical value is 20 V.
+In order for the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]] to work, it is necessary to bias their electrostatic gate. This is done via the H.V. Tennelec power supply located on the left side of the object-scintillator Canberra power supply (see figure below). The typical value is 20 V.
 {{:wiki:nim-crate2-du6.jpg?400|NIM crate 2 in data-U6}}

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