Each trigger delivered by the CTTM is sent in output through 8 LEMO
bipolar connectors, placed on the CTTM back side, providing a LVDS signal.
Six of them deliver a L0 trigger, one of them is for L1 and the last
one is a spare.
Each connector is linked to the CTP by a Draka 2 wire cable.

Trigger Description in 2009 cosmic run:

0OCP: This trigger selects events where the number of fired hits NON is larger than Nthr.
The trigger is issued when NON > Nthr. Nthr can be changed by setting he text file /SOFT/TRG/CTTM/set_mbt.txt;
this number is also reported in the base panel CTTM.

0OB3: This trigger selects events where there is a fired hit on top of TOF detector and there is a corresponding hit in a window of 7/3 Supermodules
This picture explains better the topology:
0OB3.jpg

0OIT: This trigger selects....

0OBE:This trigger is a subset of 0OB3 with only the sectors with EMCAL installed as top triggering hits

Trigger Description in 2008 cosmic run:

CH1: This trigger counts the number of fired hits NON, a number between 0 and 1728.
A trigger is issued when NON > Nthr, where Nthr can be changed just setting a
proper VME register.

CH2: This trigger selects the track useful for the TRD analysis. According to the TRD group
request a trigger is issued if the following condition is satisfied:

( (SM0_A && SM10_A) || (SM8_A && SM16_A) || (SM1_A && SM9_A) || (SM7_A && SM17_A) || (SM5_A && SM14_A) ) ) ||
( (SM0_C && SM10_C) || (SM8_C && SM16_C) || (SM1_C && SM9_C) || (SM7_C && SM17_C) || (SM5_C && SM14)_C ) )
Since Sept. 24, 2008, SM 5 and 14 were added in coincidence:
|| (SM5_A && SM14_A) || (SM5_C && SM14_C).

CH3: This channel does not deliver any trigger, since it is broken on the CTTM

CH4: This channel selects the "back to back" cosmic tracks. It delivers a signal the following condition is satisfied:

( (SM0_A && SM9_A) || (SM1_A && SM10_A) || (SM7_A && SM16_A) || (SM8_A && SM17_A) ) ||
( (SM0_C && SM9_C) || (SM1_C && SM10_C) || (SM7_C && SM16_C) || (SM8_C && SM17_C) )

CH5: This trigger selects the track useful for the HMPID analysis. According to the HMPID group
requests, a trigger is issued if the following condition is satisfied:

( (SM0_A && SM16_A) || (SM1_A && SM10_A) || (SM1_A && SM16_A) ) ) ||
( (SM0_C && SM16_C) || (SM1_C && SM10_C) || (SM1_C && SM16_C) ) )

CH6: This channel selects the vertical cosmic tracks. It delivers a signal the following condition is satisfied:

( (SM0_A && SM17_A) || (SM1_A && SM16_A) || (SM7_A && SM10_A) || (SM8_A && SM9_A) ) ||
( (SM0_C && SM17_C) || (SM1_C && SM16_C) || (SM7_C && SM10_C) || (SM8_C && SM9_C) )

CH7: Reserved for L1 trigger;

CH8: Spare channel: not connected to the CTP at the moment

-- EugenioScapparone - 16 Sep 2008

Topic attachments
I Attachment History Action Size Date Who Comment
Bitmapbmp 0OB3.bmp r2 r1 manage 133.7 K 2009-10-06 - 17:01 AlessandroSilenzi  
JPEGjpg 0OB3.jpg r1 manage 133.7 K 2009-10-06 - 17:02 AlessandroSilenzi  
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Topic revision: r8 - 2009-10-07 - AlessandroSilenzi
 
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