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High Multiplicity Trigger Operation Status
RIKEN/RBRCItaru Nakagawa
On behalf of Toru Nagashima, Aaron Key, SeYoung Han, Shoichi Hasegawa
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TRIGGER TURN ON
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Turn On Curve (South)Run# 425692
Rejection power w.r.t MUID1D3
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GL1 Efficiency (South) Run# 425692
firedpredictedmatch
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Turn on Curve (North)
Somehow contamination of 40% fake trigger 5
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GL1 Efficiency (North) Run# 425692
North is suffered from fake triggers by factor of 1.4 or so. Under investigation
firedpredicted
match
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ONLINE TRACK VS OFFLINE TRACK
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200GeV
30% of 18 offline track events are recognized as 13 online track event
13
18
Online track (=active FEMs) is limited upto 24/arm. Therefore the curve saturates at higher #of tracks
Online vs. Offline Track Correlation
Z-axis is normalized by the total entry of a given offline tracks.
Plot by SeYoung Han
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BBC-Z VERTEX DEPENDENCE
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FVTX_HighMult_S bbcz dependence
Fired trigger
Fired trigger&BBC_narrow
Run# 425692
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FVTX_HighMult_N bbcz dependenceRun# 425692
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Gain rejection power by factor of ~5
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TRIGGER RATES
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FVTX Trigger Rates of PHYSICS Runs
BBC no VTX (rates) BBC no VTX (rates)
BBC no VTX (rates) BBC no VTX (rates)
FVTX
_Hig
hMul
t_(N
&S)
&BB
Cnar
row
[Hz]
FVTX
_Hig
hMul
t_(N
||S)
&BB
Cnar
row
[Hz]
Initialization Failure at the beginning of Run
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FVTX Packet Drop Off Issue
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Packet Drop Off
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Lost in the middle of run
Lost in the middle of run
Lost in the middle of run
Lost in the middle of run
Lost in the middle of run
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Latest Physics Run
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Situation is better lately. However, we don’t know the real cause of this, so it may come back any time.
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FVTX TRIGGER PARAMETER OPTIMIZATION
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MB vs. FVTX_S Purity > # of Tracks MB FVTX_S
5 31.3% 74.8%
10 4.1% 35.7%
15 0.037% 11%
20 0.03% 2.3%
25 0.004% 0.70%
30 0.0005% 0.18%
Run#425397
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Constraints and Options
• Suppose 400 Hz total band width• 2 trigger bits are available. Following 2 options
are available:1. North & BBC_narrow + South & BBC_narrow • Optimize thresholds to satisfy 200Hz for each trigger
2. (North&South)&BBC_narrow + (North||South)&BBCnarrow• How much fraction better be assigned to AND and OR
trigger mix, respectively?
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Thre5 Thre6 Thre7 Thre8 Thre9 Thre100
5
10
15
20
25
30
5.4
15.8
25.92
10.52
FOM (Hz)
Single Trigger Optimization
*Efficiency was assumed ~ 1 due to insufficient statistics.** Prescale factor was calculated assuming 200Hz/arm*** FoM = Purity * Efficiency/ (Prescale+1) * rates [Hz] (rates of >20 tracks)
BBC rate ~ 1MHz.
The best FoM is given by threshold >=7 (14/arm)
Threshold/cage 5 6 7 8 9 10
Purity >= 20 0.027 0.079 0.162 0.263 0.357 0.6Efficiency* 1 1 1 1 1 1Rates (Hz) 2560 640 160 40 10 2.5
Prescale**+1 12.8 3.2 1 1 1 1FOM*** (Hz) 5.4 15.8 25.92 10.52 3.57 1.5
This condition can run without prescale upto BBC rate ~ 1MHz
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Single Trigger Turn On Curve
# track ≥ 14/arm# track ≥ 12/arm
See only red predicted dots and hists. Ignore green dots/hists. The data was taken in different condition.
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North&South Coincidence Threshold/
cageCoinc
CountsCoinc Rates
[Hz] Precale Efficiency Purity>20 FoM [Hz]4 317 500 2.25 1 0.016 3.56 5 64 100 1 1 0.062 6.20 6 16 27 1 1 0.188 5.08 7 1
• The best parameter is the threshold>=5 (10/arm) which provide 6.2Hz trigger rates of greater than 20 tracks/arm (40tracks/both_arm) event.
• The coincidence rates is 100Hz at BBC~1MHz. Rest of 300Hz can be assigned to North or South trigger (2.5kHz/arm @ BBC rate of 1MHz).
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Coincidence Trigger Turn on
# of track Threshold >= 8/arm
Run#425931 (MB Samples)
# of track Threshold >= 10/arm
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Summary
1. North & BBC_narrow + South & BBC_narrow option:– Run with threshold>=14/arm – Accumulate >20 track/arm events about ~ 25Hz.
1. (North&South)&BBC_narrow + (North||South)&BBCnarrow– Run with threshold >=10/arm– Accumulate > 40 track/both_arm events about ~6Hz– Accumulate > 20track/arm events about 4~5Hz.
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Statistics Estimate
• 400Hz x 6/9 weeks ~ 300M x 0.66 = 400Mevents• 400M x 0.08 purity = 32 Mevents
80M events 0-5% Central dAu in Run8
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BACKUP
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200GeV
510GeV
200GeV vs. 500GeV
Plot by Toru
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Normalized by Online Track
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Trigger Efficiency FEM by FEM
Run425571 (2015-03-07 22:16:25) South GL1 Eff = 0.995, Inv Eff=0.914 North GL1 Eff= .996, Inv Eff=0.858
FEMIB Logic : ORMinimum FEMs : 1Trigger config logic : ANDMinimum hits : 4Minimum wedges : 3
North event rate : ~ 5.0kSouth event rate : ~ 5.3k
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