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--- hv_bias [2014/11/19 12:26]
pereira [HV Manual control]
+++ hv_bias [2023/10/17 09:40] (current)
noji
@@ Line 1: / Line 1: @@
 ====== Detector bias control ======
 ===== 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**.
-{{:wiki:hv-gui.png?700|GUI control panel of the S800 detectors HV}}
+The high-voltage of the plastic scintillator and the MCP at Object, the [[Detectors#Tracking Parallel Plate Avalanche Counters (TPPAC)|TPPACs]] at Intermediate Image, the [[Detectors#Cathode Readout Drift Chambers (CRDC)|CRDCs]], [[Detectors#Ionization Chamber|ion chamber]], [[Detectors#Plastic scintillators|plastic scintillator]], and [[Detectors#Hodoscope|hodoscope]] at Focal Plane are remotely controlled via CS-Studio Phoebus (see figure below).
+{{:wiki:phoebus_diag_hv.png|CS-Studio Phoebus DIAG HV control}}
+This “S800 HV Bias Power Supply” page is linked from both "S800" and “DIAG” launchers, a screenshot of the former of which is shown below.
+{{:wiki:css_s800launcher_hv.png|}}
+The ramp rate can be changed in the "Details". ISEG cards that are used here have only one ramp rate per bank of channels, so changing the rate for one channels will change the rate for all the others in the same bank. When you ramp the HV, ensure that the ramp rate is set properly.
+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.
+{{:wiki:phoebus_ps_main.png|CS-Studio Phoebus PS HV control}}
+The actual HV modules are located on the top level of the S3 vault, under the FP chamber.
-===== HV Manual control ====
+{{:wiki:img_1369.png|}}
-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.
-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.
+Other examples of HV values used with different fragment beams are:
-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.
+* **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)
-{{:wiki:nim-crate2-du6.jpg?400|NIM crate 2 in data-U6}}
+* **IC**:
+   * Typically 200 V

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