View
23
Download
4
Category
Preview:
DESCRIPTION
Tests of Fast Timing Detectors in the Meson Test Beam (T979) MTest : May 27 th – June 2 nd. Mike Albrow, Sasha Pronko, Erik Ramberg, Anatoly Ronzhin, Andriy Zatserklyaniy + detector simulations by Hans Wenzel & Earle Wilson (student). Motivations for ~ ps / 10 ps timing detectors - PowerPoint PPT Presentation
Citation preview
1Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
Tests of Fast Timing Detectors in the Meson Test Beam(T979) MTest : May 27th – June 2nd
Mike Albrow, Sasha Pronko, Erik Ramberg, Anatoly Ronzhin, Andriy Zatserklyaniy+ detector simulations by Hans Wenzel & Earle Wilson (student)
Motivations for ~ ps / 10 ps timing detectors
Set-up and triggers etc.
Detector configurations:
A) A – B – C in lineB) A+B transverse bars – CC) Q-bar1(A) – Q-bar2(B) – CD) Aerogel(C) – BE) Si-PMTsF) Photonis1 – Photonis2 – C in lineG) Q-bar1(A) – Q-bar2(B) – 8.7 m flight path --- C in line
Thoughts about next steps
To be explained!
Only if you ask!
2Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
Motivations:Timing on single particles σ(t) typically >~ 100 psA factor 10 – 100 improvement likely to have unforeseen benefits.We know of some (foreseen), e.g.:
Particle ID in beamsE.g. at 25 GeV/c, over 15m:Δt(π-K) = 20 psΔt(K-p) = 50 psor at 10 GeV/c, over 30m:Δt(π-e) = 10 ps==================Areas ~few cm2, want thin.
Particle ID in large detectors(~CDF-like or ILC)E.g. at 6 GeV/c, over 1.5m:Δt(π-K) = 17 psΔt(K-p) = 43 ps==================Areas ~several m2, want thin.
Pile-up reduction e.g. in FP420:Extensions to CMS & ATLAS in prepn.p + p p + H + p + nothing elseMeasure p’s M(H), J, C, P, Γ
CMS
Hp p240m … 420m240m … 420m
Argonne-Chicago-(Henry Frisch et al.)
Fermilab group
3
21
PET-TOF β+e Δt = 10ps : Δ z = 3mm
4
3Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
to CMS Exec Board Summer 2008(ATLAS is also reviewing)
2.1mm/10psp)Δt(pc2
1TOF)Δz(pp,
?z(vertex) from pp == z(vertex) central
Pile-up reduction in FP420Want L ~ 10^34, <n> ~ 25/x
cf σ(z)vtx ~ 60 mm
4Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
At MTest, 120 GeV/c p, ~40,000/spill
Simple trigger (schematic):2mm x 2mm scint. VETO w/hole2 PMTs in AND 2 PMTs in OR
Calibrate electronics resolution with same pulse start & stop: σ ~ 3 ps Cerenkov light in Quartz window. HV ~ 4.5 kV, G ~ 5.10^5
Dark & shielded box
PHOTEK 2102 MCP, 10mm Φ
PHOTEK 2402 MCP, 40mm Φ
210
First A-B-C in line
MCP-PMT-A
ORTEC566, 567
TAC/SCA
ORTECAD114ADC
ATTENUATOR
ADC
ATTENUATORMCP-PMT-B
DAQ
ADC
CBA
Schematic DAQ :
T1
5Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
A-B-C in-line results: Cerenkov light in PMT windowsAll numbers “preliminary”, to be double-checked
ADC distributions: cut out tails and stragglers (~ 10%)T1 = tA – tBT2 = tA – tCT3 = tB – tC=======Check Ti(PH A,B)Make slewing corrections
Unfold:
A
BC
23
22
21
2
1TTTA
etc. PMT-1 (Photek-210, 4.7 kV)=12.0 psPMT-2 (Photek-210, 4.6 kV)=12.0 psPMT-3 (Photek-240, 4.2 kV)=7.7 ps
Cerenkov light in PMT windows
6Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
Double Q-barQuartz (fused silica) bars 6mm x 6mm x 90mm PHOTEK 210Mounted at Cherenkov angle θc ~ 48deg. on opposite sides.dz = 6mm/sin(48) = 8.1mm. Some light direct to PMT, ~1/2 TIR to PMTBlack “sock” over bars just to avoid light sharing
C
B
A
Unfold:σ(A) = 22.3 psσ(B) = 30.5 ps
Includes electronics (~3 ps)and 2 mm beam width smear (A,B)Δt = 2 mm x (10 ps/2 mm)
ps 28.71035.30
ps 9.711033.22
222
222
B
A
Combining [AB] removesbeam spread (later, tracking)
7Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
σ = 6.04 ch = 18.7 psUnfold C = 7.7 ps, σ(AB) = 17.0 ps
Resolution of double-Qbar
2 mm x-spread not to be subtracted(only 3 ps electronics)
Resolution of Double-Qbar as one device
T3)3T2(T14
1C
2
BA
*
* Derivation in back-up
8Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
Switched on, saw signals!
A = Aerogel
B
Corrected T2 = A-B = 10.8 ch = 33.5 ps (before unfolding)
9Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
Aerogel results:Unfolding indirect because only 2 PMTs in run.A (Aerogel on 240) and B(210 in beam)T1 = t(A) – t(B) corrected for smearing:10 mm aero σ(T1) = 43.7 ps20 mm aero σ(T1) = 45.3 ps30 mm aero σ(T1) = 33.5 ps Unfold with σ(1) = 12 ps from in-line
σ (Aerogel 30 mm) ~ 31 ps
<P.H.> = 46 ch. (10mm) 72 ch. (30 mm)
Aerogel + mirror ~ massless & short (~ 5 cm), simple.Can have several in line, independent √NBUT: have large 240 tube close to beamPossibilities to focus light : smaller tube farther away, to be simulated
AEROGEL
MCP-PMT
10Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
Tests of SiPMs = silicon photomultipliers
Eight Hamamatsu SiPMs, 3mm x 3mmIn beam with quartz Cherenkov radiatorsseveral thicknesses (4 – 12mm), mirrored and not mirrored.
Best conditions σ(t) ~ 33 – 37 ps
10-15 photoelectrons
Channels
Between SiPMs and C. Slewing correction applied
11Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
World’s Best Beamline Time-of-Flight System?
24 psec resolution positron peak,Using average of A & B times
Can measure momentum of a proton with 2 MCP-PMTs! (if you know it’s a proton!)
Start = Double-Q-barStop = Photek 240Start-stop dist. = 8.7 m Predictions of proton positions
12Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
Possible Next Steps
For FP420 a σ(t) = 10 ps edgeless detector we learnt a way including CMS-compatible electronics/DAQwith reference time signals (jitter <~ 5 ps)
θc = 48deg Q-bars onto PHOTEK 240 MCP-PMTs
40 mm diam. MCP
6mm x 6mm barsTIR: isolated
p
20mm
I
“beam” only 6mm vert.,20 mm horiz.
MCP
MCP
Should get < 8 ps
+ More aerogel? To test in Fall?
13Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
We thank:
PHOTEK Ltd (UK) for loan of MCP-PMTsAccelerator Division Ops for beam, and patience over many accessesJim Pinfold and Don Summers for gift of aerogelCarl Lindenmeyer and John Korienek for Q-bar supportRick Coleman for low energy beamsHogan Ngyuen & SiDet dept. for many things
From FP420 R&D doc.
LHC beam
14Mike Albrow All Experimenters, June 8th 2009T979: Tests of Precision Timing Detectors @ MTest
T1 = A - BT2 = A - CT3 = B - C ------------T1 + T2 = A - B + A - C3 x T3 = 3B - 3Cso T1 + T2 + 3x T3 = A - B + A - C + 3B - 3C = 2A + 2B - 4Cand 1/4 ( T1 + T2 + 3x T3 ) = (A+B)/2 - C
Back Up
T3)3T2(T14
1C
2
BA
Why:
Recommended