Difference: JRichTBTrigger (11 vs. 12)

Revision 122017-05-29 - StephenWotton

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META TOPICPARENT name="LHCbRICH"

JRichTBTrigger

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9 Tracker-B J6(83,84)

Variable pulser frequency

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The Pulse delay textfield can be used to vary the frequency of the pulser. The allowed range is from 10 to 65k. For normal operation the pulser should be set to the order of 100kHz, corresponding to setting 200. At higher frequency (lower delay), the ethernet switch discards packets and the online data processing may experience difficulties keeping up.
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The Pulse delay textfield can be used to vary the frequency of the pulser. The allowed range is from 10 to 65535. For normal operation the pulser should be set to the order of 100kHz, corresponding to setting 100. At higher frequency (lower delay), the ethernet switch discards packets and the online data processing may experience difficulties keeping up. The delay is set in steps of 100ns in the current version of the firmware.

Deadtime control

For reliable triggering it is essential to set a minimum trigger deadtime to veto triggers until the hardware is ready to respond to the next. This is especially important when several parts of the system are running synchronously (e.g. tracker, RICH and beam scintillators). For example, with the RICH upgrade readout in TAE mode sending 23 time slots, the deadtime can be used to enforce a minimum spacing between triggers of 23 times 25ns (575ns). The deadtime setting in the trigger board is an integer with each step being 100ns so in this case, a setting of at least 6 (i.e. 600ns) should be used, more to be safer. The allowed range is 1-511. The deadtime can also be used to limit the rate to reduce packet loss in the network switch.
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