From BESIII Ferrara Group Wiki
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| − | == Triggerless efficiency ==
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| − | The triggerless efficency has ben measured with one TIGER and one GEMROC. The acquisition was set in triggerless mode and the TP are generated by the GEMROC itself. The GEMROC generate N TPs after each Frameworld received from the chip. The time between the TPs is set by another parameter. This parameter was set to make the TP emission homogeneous with respect to the time.
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| − | The data are then decoded and, with a simple script, the efficiency is calculated like the rate between the expected number of test pulse (N times the number of frame-word acquired) and the number of TP registered by the system.
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| − | === Digital test pulses on 64 channels ===
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| − | {| class="wikitable"
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| − | |+
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| − | !TP per frameword
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| − | !Event Rate (kHz)
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| − | !Efficency
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| − | |-
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| − | |1
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| − | |4.8
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| − | |100%
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| − | |-
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| − | |2
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| − | |9.8
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| − | |100%
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| − | |-
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| − | |12
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| − | |58.6
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| − | |100%
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| − | |-
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| − | |13
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| − | |63.4
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| − | |98%
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| − | |}
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| − | Both the devices (GEMROC and TIGER) are designed to allow a rate up to 60 kHz per channel (3840 kHz per chip). This measure confirm the performances in the communication between one GEMROC and one TIGER.
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| − | === Digital test pulses on one channel ===
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| − | {| class="wikitable"
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| − | !TP per frameword
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| − | !Event Rate (kHz)
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| − | !Efficency
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| − | |-
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| − | |20
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| − | |97.7
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| − | |100%
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| − | |-
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| − | |22
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| − | |107
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| − | |100%
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| − | |-
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| − | |25
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| − | |122
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| − | |100%
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| − | |-
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| − | |30
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| − | |146
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| − | |100%
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| − | |-
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| − | |35
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| − | |170
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| − | |100%
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| − | |-
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| − | |37
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| − | |180
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| − | |100%
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| − | |-
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| − | |40
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| − | |195
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| − | |90%
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| − | |}
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| − |
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| − | === Analog test pulses on one channel ===
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| − | {| class="wikitable"
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| − | !TP per frameword
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| − | !Event Rate (kHz)
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| − | !Efficency
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| − | |-
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| − | |10
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| − | |48.8
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| − | |100%
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| − | |-
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| − | |22
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| − | |107
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| − | |100%
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| − | |-
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| − | |25
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| − | |122
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| − | |100%
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| − | |-
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| − | |30
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| − | |146
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| − | |100%
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| − | |-
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| − | |37
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| − | |180
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| − | |100%
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| − | |-
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| − | |38
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| − | |185
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| − | |93%
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| − | |}
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Latest revision as of 08:49, 31 May 2019
