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preparation_for_tuning_the_s800 [2013/12/13 20:53] pereira |
preparation_for_tuning_the_s800 [2013/12/14 10:37] pereira |
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* [[Turning magnets on/off]] | * [[Turning magnets on/off]] | ||
* [[Magnetic-rigidity setting]] | * [[Magnetic-rigidity setting]] | ||
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- | DETECTOR BIAS CONTROL | ||
- | (under development) | ||
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- | General Information | ||
- | The TPPACs, the Ion Chamber, and the CRDCs have ISEG power supplies run through a single VME-based bias control. | ||
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- | Object Scintillator | ||
- | The bias for the object scintillator is controlled via the Canberra HV supply located in the left rack in Data-U6 in the NIM bin just underneath the NMR scopes. | ||
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- | 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. | ||
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- | Ion Chamber | ||
- | The biases for the anode and the drift electrode are each controlled separately via the S800 Detector HV Control. Parts of this detector rely on the same 12-Volt power supply used to power the bases of the FP Scintillator PMTs. If the vacuum-based interlock condition for protecting the FP Scintillator PMTs is triggered, the 12-Volt power supply will not be available for the Ion Chamber. | ||
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- | CRDCs | ||
- | 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. | ||
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- | 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: | ||