1. Trigger Matrix Shiuan-Hal

2. Trigger (“times 4”) μ xhodoscopexhodoscope yhodoscopeyhodoscope discriminatorlevel shifter level 1 v1495 level 2 v1495 trigger supervisor TRIGGER

3. Compare with E866 trigger system Replaced by v1495

5. TERM OR TRIG S4XY AND134

6. E866 Trigger matrix  Using the fast monte carlo simulation data. And make cut which listed below.  Only using station 1,2,4 hodoscope.  Ignore all the track crossing X=0(The muon was bended in Y-direction in E866)  Restrict the positive muon go to upper side, and negative muon go quite the other way in first station.  Confine the simulation muon come from the target and not from the dump.

7. E906 VS. E866 trigger system  E866  Made up by CAMAC and NIM logic modules  Common start  91ns from RF to trigger output  Look up table was build in memory chip.  E906  Made up by VME FPGA modules  Common stop  Maxium 300ns from RF to trigger output  Look up table was build in FPGA

8. E906 Trigger system hardware limit  128 input channels with 1 ns resolution and 128 ns adjustable delay.  The latency from input to output is about (5x4=20)+?? ns. The latency will less then 150ns now for each v1495. Each pipeline step only cost 4ns now, and we have only 5 layers pipeline in our design. The “??” here means the latency from input to the trigger matrix pipeline which we are still not measure.  From a simple muon track simulation in bend plane, we found there are almost 1400 track conditions will appear for a positive muon. It means 2800 tracks need to deal in one v1495, and may cost about 9000 logic elements.

9. E906 Trigger matrix current situation  In band plane v1495  Bit 1 on – if a triplet was a positive muon with a Ptxmax<0.6 GeV  Bit 2 on – if a triplet was a positive muon with a Ptxmax<0.9 GeV ……..  Bit 8 on – if a triplet was a positive muon with a Ptxmax<2.7 GeV  Bit 9 on – if a triplet was a negative muon with a Ptxmax<0.6 GeV  Bit 10 on – if a triplet was a negative muon with a Ptxmax<0.9 GeV ……..  Bit16 on – if a triplet was a negative muon with a Ptxmax<2.7 GeV.  In non-band plane v1495  Still under discussion.  Maybe need to add the information of the number of fired paddle.

10. E906 Trigger matrix current situation  Target Dimuon, good momentum  Dump Dimuon  Other Dimuon  Single target muon  Single non-target muon  At least one quadrant indicates track  3/4 planes hit in at least 2/4 front end FPGAs