triggering with the rpd e. burtin, cea-saclay compass hadron run trigger meeting, feb. 12, 2008
TRANSCRIPT
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Triggering with the RPD
E. Burtin, CEA-Saclay
COMPASS Hadron run trigger meeting, Feb. 12, 2008
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Overview of the full project
Ring A
Ring B
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Commissioning
Calibration (Oct 12 - Nov 5):rot 0°, 30°, 90°Trigger tests (Nov 5 - Nov 11)
6 7
View fromJura side 2007Upstream 2008
9
56
8
Ring A
18
1
2
58
10
11
12
13
14
15
161719
2021
22
23
43
0 01
2 3 4
7910
11
Ring B
Muonbeam 0
54
3
2
1
6
7
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Energy loss correlations
Tests in 2001
protons
protons
-electronsThicknessA : 4 mmB : 5 cm
ThicknessA : 5 mmB : 1 cm
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Trigger condition
protons
e
Area of interest is :Ahi.Blow or Alow.Bhi
Alow
Bhi
Ahi
Blow
Thresholds choice ingredients: - Dynamical range - Attenuation (=70cm) A : 0.25 B : 0.10
Limitation on Bhi to accept high momentum (1GeV/c) proton
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Proton identification
protons
e
275 410 760 MeV/cFor protons
Limitation:Thickness of Bring elements
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Proton trigger
Trigger timed on Alow
down
Trigger:- At least one A.B pair fired - Done- Only one A.B pair fired - Under study
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Jitter on signals
tupB
tdoB
tupA
zB tB
tdoA
zA tA
target Z
LB
LA
tdoA has ~2ns jitter
Leading edges of all signals within 30ns
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Trigger board : CAEN V1495
Design & Programmation of the FPGA done by Christophe Flouzat« Conduct of operations » :
• All signal sampled at 400 MHz (2.5ns)• Individual delays applied• Logic function realized• Output of signals on 2 lemo & 64 LVDS
Ai;downlow
Ai;uplow
Bihi
Trigger
80ns
D
D
D
Could fit in 50 ns
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Trigger latency
Adownlow
Trigger
Time to produce a trigger < 150 ns
Laser signal
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Trigger signal jitter with BEAM
Oscilloscope triggered by the finger trigger signal
Scope triggeredby hodoscopes signals
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Conclusions
Trigger board :• Design validated
• Jitter of AiBj coincidence is ~2.5 ns (due to the sampling)• Each coincidence can be aligned in time
Open possibility• 32 spare inputs for Forward Hodoscopes if needed• 64 outputs can be used for further processing
Needs commissionning with beam …