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electronics [2015/10/25 09:50] pereira |
electronics [2016/08/01 13:00] pereira [Electronic Diagrams] |
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===== Electronic Diagrams ===== | ===== Electronic Diagrams ===== | ||
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- | ===== Timing ===== | ||
- | In a typical S800 experiment, there are different time-of-flight (ToF) measurements that can be used to identify the fragments of interest. The most common timing-signal sources used are the RF cyclotron; the thin plastic scintillator at the A1900 focal plane box (XFP); the [[Detectors# | ||
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- | Although it is possible to measure the ToF between any pair of timing sources, there are three " | ||
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- | Although the timing reference (" | ||
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- | Some important things to know about each of these modules: | ||
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- | === MTDC === | ||
- | * This module has multi-hit capabilities and better time resolution than the Phillips TDC and TACs. However, it is not yet in production mode | ||
- | * Before getting into the MTDC, the OBJ, XFP, and E1 up signals go through a {{: | ||
- | * The OBJ signal into the MCFD comes directly from the detector via S3 patch panel #94 | ||
- | * The XFP detector signal is sent to a {{: | ||
- | * The MTDC timing signals do not require external delay adjustments because the matching window is sufficiently wide | ||
- | * SpecTcl calculates the OBJ-FP and XFP-FP ToFs by substracting the E1 up time (MTDC channel 15) to the OBJ time (MTDC channel 3) and the XFP time (MTDC channel 2) | ||
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- | === Tennelec TACs === | ||
- | * Unlike the MTDC and Phillips TDC, there is no TAC for the RF-FP ToF | ||
- | * Before going to their corresponding TAC, the OBJ and XFP detector signals are sent to a {{: | ||
- | * The OBJ output from the CANBERRA 454 CFD is sent to the stop of OBJ-FP TAC via patch panel #62 | ||
- | * The XFP output from the CANBERRA 454 CFD is sent to the stop of XFP-FP TAC via patch panel #70 | ||
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- | === Phillips TDC === | ||
- | * Before going to the TDC, the OBJ and XFP detector signals are sent to a {{: | ||
- | * The TDC start is provided by the [[Trigger|ULM trigger module]]. Since the delay of the S800 trigger may be adjusted during tuning of the S800 (XDT), the stop signals (e.g. from OBJ or XFP) need to be re-adjusted so that the ToF fits into the 400-ns range of the TDC. This is done manually for OBJ and XFP, and remotely (via delay GUI) for other timing signals | ||
- | * The OBJ output signal from the CANBERRA 454 CFD is delayed with the low-noise delay boxes in data U6, and sent to the TDC via patch panel #67 | ||
- | * The XFP output signal from the CANBERRA 454 CFD is delayed with the low-noise delay boxes in data U6, and sent to the TDC via patch panel #66 | ||
- | * SpecTcl calculates the OBJ-FP and XFP-FP ToFs by substracting the E1 up time (channel 8) to the OBJ time (channel 14) and the XFP time (channel 15) | ||