Difference: AMC13UserManual (21 vs. 22)

Revision 2202 Sep 2015 - EricHazen

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META TOPICPARENT name="HcalDTC"
THIS MANUAL IS INCOMPLETE but what is written here should be more accurate and up to date than the old "functional specification". Please e-mail me if you find mistakes/omissions here (Eric H).
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  1. SFP transceiver with loop-back fiber from Tx to Rx must be installed in bottom site
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HCAL Orbit Gap Calibration

The AMC13 implements several features to facilitate triggers for calibration purposes during the LHC "Orbit Gap" during which no normal L1A should occur. The details of this have to a certain extent been lost in time.

See 2009 CMS Note by Jeremy et al about this. Here is a table of TTC command used by HCAL extracted from the document.

Code Name Source Meaning AMC13 Action
00001001 (0x09) BCZero BGo-1 Bunch Counter Zero (any with LSB set) BcR
00000100 (0x04) SOG BGo-11 Start-of-Gap (QIE Reset) -none-
11100010 (0xe2) ECR BGo-7 Event Counter reset ECR (programmable code)
10001000 (0x88) Start BGo-9 TPG generator start -none-
10101000 (0xa8) Stop BGo-10 TPG generator stop -none-
01000000 (0x40) Gap-Trigger BGo-13 Laser/LED in next gap Enable gap trigger this orbit only
01100000 (0x60) Gap-Pedestal BGo-13 Pedestal in next gap Enable gap trigger this orbit only
10000000 (0x80) Gap-Sequence-Step BGo-13 Advance laser Increment current laser position

 

Wu's Debugging Guide


 
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