Minimum Bias Trigger Detector Mickey Chiu May 2325 2018 BNL May 2325 2018 sPHENIX DOESC CD13A Review 1 Expected that we can reuse the PHENIX BBC 128 chs of 3 cm thick quartz radiator on mesh dynode PMTs ID: 734567
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sPHENIX DOE-SC CD-1/3A ReviewMinimum Bias Trigger Detector
Mickey ChiuMay 23-25, 2018BNL
May 23-25, 2018
sPHENIX DOE-SC CD-1/3A Review
1Slide2
Expected that we can re-use the PHENIX BBC128 ch’s of 3 cm thick quartz radiator on mesh dynode PMTsProvide minimum-bias trigger with high efficiency for heavy ion collisions (>85%)Needs online z-vertex resolution of at least 2.5 cm, ie
, 120 ps/chContributes to centrality, reaction plane, and start time
2
WBS 1.07: Overview
May 23-25, 2018
sPHENIX DOE-SC CD-1/3A ReviewSlide3
WBS 1.07: Placement in sPHENIX
sPHENIX DOE-SC CD-1/3A Review3
Considering z = 144, 200, 250, and 300 cm, ie, from original PHENIX location to near flux return
z (cm)
ηminηmax
B
Z
(T)
Rel. Gain
AuAu
MB
Eff
(%)
pp
MB
Eff
(%)
144
3.0
3.9
1.110.0190392003.334.230.750.1589362503.564.450.500.588343003.744.630.320.98732
May 23-25, 2018Slide4
WBS 1.07: Placement in sPHENIX
sPHENIX DOE-SC CD-1/3A Review4
Considering z = 144, 200, 250, and 300 cm, ie, from original PHENIX location to near flux returnz
(cm)
ηminηmax
B
Z
(T)
Rel. Gain
AuAu
MB
Eff
(%)
pp
MB
Eff
(%)
144
3.0
3.9
1.110.0190392003.334.230.750.1589362503.564.450.500.588343003.744.630.320.98732
May 23-25, 2018Slide5
WBS 1.07: Placement in sPHENIX
sPHENIX DOE-SC CD-1/3A Review5
Considering z = 144, 200, 250, and 300 cm, ie, from original PHENIX location to near flux return
z
(cm)ηminηmax
B
Z
(T)
Rel. Gain
AuAu
MB
Eff
(%)
pp
MB
Eff
(%)
144
3.0
3.9
1.110.0190392003.334.230.750.1589362503.564.450.500.588343003.744.630.320.987
32
May 23-25, 2018Slide6
L1 Trig, Modebits, CLK
6
WBS 1.07: Readout Design
sPHENIXGTM
sPHENIX DAQsPHENIXBBC LL1sPHENIXGL1
Use
sPHENIX
EMCAL digitizers, and build a transition board to convert single-ended PMT signal to 100 ohm differential that stretches PMT signal to be recorded by 60 MHz ADC
Two possibilities to satisfy the trigger and timing requirements. Both options require splitting the signal. One is a shaped pulse for energy measurement. The other
is a square ~1V discriminator signal (for timing at trigger level and
precisiong
timing in offline).
or is a ramp and hold on a comparator (TAC) that is input to the digitizer
sPHENIX
Digitizers
(4 ADC boards)
Disc/
Shaper
Board
BBC PMTs
In WBS 1.05 + 1.06 ScopeIn WBS 1.07 ScopesPHENIX DOE-SC CD-1/3A ReviewMay 23-25, 2018Slide7
ShapedWBS 1.07: Status & Recent Accomplishments
7
C.Y. Chi,W. SippachTDC ADC
sPHENIX
DigitizerDAQD/S BoardLL1Board
43
2
ps
+ ? + 13
2
ps
<= 50
2
ps
Disc
Laser PMT Test
Split Pulse Test
sPHENIX DOE-SC CD-1/3A ReviewMay 23-25, 2018Slide8
WBS 1.07: Project Organization
8
BNL M. Chiu, M. Lenz, R. PisaniProject Lead, detector and electronics testingRIKEN Y. Goto
PHENIX BBCs
Nevis/Columbia C.Y. Chi, W. SippachDisc/Shaper BoardLehigh University R. ReedDetector and electronics testing, simulation, operations supportsPHENIX DOE-SC CD-1/3A ReviewMay 23-25, 2018Slide9
WBS 1.07: Milestones
9
1.07.03 Procure and Test Electronics for MBD Milestone
1.07.02 Disc/Shaper Board Prototype Milestone
May 23-25, 2018sPHENIX DOE-SC CD-1/3A ReviewSlide10
WBS 1.07: sPHENIX MinBias Trigger MIE At-Year Burdened & Esc $
10
May 23-25, 2018sPHENIX DOE-SC CD-1/3A ReviewSlide11
WBS 1.07: sPHENIX MinBias Trigger Labor ProfileMIE Labor + BNL Contributed Labor + Collaborator Contributed Labor
11
May 23-25, 2018sPHENIX DOE-SC CD-1/3A ReviewSlide12
WBS 1.07: sPHENIX MinBias Trigger Detector MIE M&S Basis of Estimate
12
May 23-25, 2018sPHENIX DOE-SC CD-1/3A ReviewSlide13
Risk Summary: WBS 1.7 Min Bias Detector
May 23-25, 2018sPHENIX DOE-SC CD-1/3A Review
13Slide14
Issues and ConcernsIf the the Disc/Shaper Board cannot meet the spec of 50 ps resolution with 60 MHz digitizers, a backup solution based on a TAC (as used in PHENIX) will have to be designed
May 23-25, 2018
sPHENIX DOE-SC CD-1/3A Review14Slide15
SummaryReuse of PHENIX BBC provides a high quality, cost-effective, reduced risk solution for the sPHENIX MBDMay 23-25, 2018
sPHENIX DOE-SC CD-1/3A Review15Slide16
Back Up
May 23-25, 2018
16
sPHENIX DOE-SC CD-1/3A ReviewSlide17
PMT Resolution Study17
Used 20
ps piLAS
laser studies going wellGot 43 ps time resolution for 33 p.e.
at lower than nominal gainLaserBBCMay 23-25, 2018sPHENIX DOE-SC CD-1/3A ReviewSlide18
Testing sPHENIX Digitizer Timing
NEW ADC
Input a signal from Agilent generator, that is passively split, and look at time difference between the two “identical” signals from the NEW ADCs to determine the timing resolution of the NEW ADCs.Signal generated is shown on the right, and is intended to get close to matching what will be generated by the new disc/shaper board.
We need to know the final shape to use!Shape tested was only ~2 samples during rise to check if this would be good enough
18May 23-25, 2018sPHENIX DOE-SC CD-1/3A ReviewSlide19
sPHENIX Digitizers Timing Resol.
19
We created signal shape templates and did a full chi-2 minimization (MINUIT) fit to get the start time for each of the two pulses from the split cable
This can only be done in offline, and is the best possible resolution one could ever get
For the resolution at L1, the resolution depends on the algorithm and still needs to be studiedWe put the two split (identical) signals into the same board and also into different ADC boards so that we could see if there was a contribution from the clock propagationGetting sub 1 ps from same ADC board, and ~13 ps (= 18.6/√2) from different boards. Clock propagation jitter at 13 ps level?Some anomalous systematic timing difference (at Δt = 0.01 ns) in some events that needs to be studiedSame BoardDifferent ADC BoardsAnomalous times?
May 23-25, 2018
sPHENIX DOE-SC CD-1/3A ReviewSlide20
B-field Study20
Study of PMT Gain vs (Field Strength, Angle, PMT HV)
w/ Paul Gianotti
, Camillia Fayyazi
Field Strength: Up to 0.735 T but in old documentation it says safer to stop at 0.4 TEventually stopped at 0.5 TField orientation at proposed locations of BBC range from 2-5 degreesRan at 0 and 5 degreesPiLas LaserMagnet regionDRS4Readout
Hall
Proble
Magnet region
May 23-25, 2018
sPHENIX DOE-SC CD-1/3A ReviewSlide21
B-field Study ResultsBBC in PHENIX runs at 30 (inner) or 40 (outer) pC
/MIPNeed MIP peak to calibrate gainNeed to confirm expected max particles in a tube (was ~30 in PHENIX) to get required dynamic range
Single particle peak
PHENIX@144 cm
sPHENIX@300 cmEff -3% AuAu, -7% ppsPHENIX@250 cm
Eff -2%
AuAu
, -5% pp
PHENIX
AuAu
200 GeV
May 23-25, 2018
sPHENIX DOE-SC CD-1/3A Review
21