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hv_bias [2013/12/14 15:56] pereira [CRDCs] |
hv_bias [2014/11/19 11:53] pereira [Object Scintillator] |
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===== General Information ===== | ===== General Information ===== | ||
- | The [[Detectors# | + | The high-voltage of the [[Detectors# |
- | ===== Object Scintillator ===== | + | {{:wiki:hv-gui.png?700|GUI control panel of the S800 detectors HV}} |
- | The bias for the object scintillator is controlled via the H.V. power supply | + | |
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+ | detectors | ||
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+ | [[Detectors# | ||
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+ | ===== | ||
+ | Apart from the detectors listed above, the voltages of the object scintillator and the electrostatic gate of the CRDCs are adjusted manually. | ||
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+ | The bias for the object scintillator is controlled via the H.V. power supply {{: | ||
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+ | In order for the 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). | ||
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+ | {{: | ||
===== FP Scintillators ===== | ===== FP Scintillators ===== | ||
Only the fist two scintillators are typically used since in most cases particles do not reach beyond the second detector. The biases for the anode and the drift electrode are each controlled separately via the S800 Detector HV Control. To protect the scintillator PMT bases from damage from discharge under poor vacuum conditions (for example, during a window break on one of the nearby gas detectors), the 12-Volt supply for the PMT bases is interlocked to switch off if the pressure in the focal plane box rises above some minimum value as read by an ion gauge. The ion gauge controller (a black box with an LED digital display) is mounted on the south support structure for the focal plane chamber. | Only the fist two scintillators are typically used since in most cases particles do not reach beyond the second detector. The biases for the anode and the drift electrode are each controlled separately via the S800 Detector HV Control. To protect the scintillator PMT bases from damage from discharge under poor vacuum conditions (for example, during a window break on one of the nearby gas detectors), the 12-Volt supply for the PMT bases is interlocked to switch off if the pressure in the focal plane box rises above some minimum value as read by an ion gauge. The ion gauge controller (a black box with an LED digital display) is mounted on the south support structure for the focal plane chamber. | ||
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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# | 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# | ||
===== 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# |