JINR and DMS in HCAL and Muon DPG
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Transcript of JINR and DMS in HCAL and Muon DPG
JINR and DMS in HCAL and Muon DPG
Moisenz P., JINR Dubna
DPG RDMS Workshop,
CERN, March 12th, 2009
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HE calibrationHE response in magnetic fieldBeam halo dataCSC timingCSC spatial resolution CSC internal alignmentRemote analysis at JINR
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HE Calibration with Combined ES/EE/HE Data (TB07)
P. Moisenz (JINR, Dubna, Russia),
RDMS Conf. 14-19 Sept. 2008, Minsk (Belarus)
Introduction
ES, EE, HE calibration
Beam cleaning
Particle identification
Absolute energy scale
Uniformity scan
Sourcing
Cosmic runs analysis
Beam halo
Magnetic field
Spatial resolution
Conclusion
HE calibration for the 1st LHC day
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Introduction • Muon energy scan
for HE, ES• Energy scan from 2
GeV up to 300 GeV (pion and electron
for HE, EE+HE, ES+EE+HE)
• Spatial resolution scan for HE
• Uniformity scan for ES+EE+HE
• Sourcing EE back plane
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Test Beam 07
HE
EE
ES
CO2
Freon
BEAM
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HE L3 CalibrationEbeam for e beam
Ebeam·π/e for π beam
π/e=1+(e/h-1)·α·log(Ebeam)
e/h
e/h and α are from
• a priori knowledge of detector
• simulation
• experimental data
44 cal. coeff.
from calib. region
HE prototype
•pions from 20GeV up to 300GeV•electrons from 20GeV up to 150GeV•total number of showers is ≈ 260000
····
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HE Standalone Absolute Energy Scale (η=19.5, φ=14.5 )
Linearity from energy correctionEnergy resolution from π/e energy correction
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HE Combine Absolute Energy Scale (η=19.5, φ=14.5 )
EE<1GeV (mip) EE≥1GeV (mip)
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Wire source signal distribution
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HE gains with Sourcing
Source Purchase Original
(Co-60) Date Activity
RP4171 Dec 2005 186MBq HE+ sourcing Feb 2006
RP4168 Dec 2005 146MBq TB07 sourcing
Mean value of TB07 sourcing (with collimated source
normalization) is .2338fC.
In Feb 2006 RP4168 had 21.5/5.271*.2338=.2848fC.
With RP4171 normalization .2848*186/146=.3628fC.
In normal mode - .3628/3=.1209fC or
.1209fC*.19345GeV/fC=.0234GeV
HE gains distribution with TB07 data
AW/AC ratio vs η for
4th layer (φ=3)
Vardan Khachatryan
Muon Energy Deposition (TB07 vs CRAFT08)
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TB07 CRAFT08
2.656·cos(η=1.603)=2.449GeV 2.859·.88=2.516GeV
Due to track slope Due to π- (50GeV) calibration
STUDY OF MAGNETIC FIELD INFLUENCE ON HE
RESPONSE(CRAFT ReReco Data)
Moisenz P., Khachatryan V. JINR, Dubna, DPG meeting, February 23th, 2009
Introduction
CRAFT Rereco Data
Conclusion
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HE Response in Magnetic field
New CRAFT Data (ReReco)
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CRAFT Reco CRAFT ReReco
For CRAFT Data (ReReco) we have - new individual (π 50GeV) HE calibrations both for B=0T and B=3.8T with factor 1.08 - new tracker software - new CSC alignment
TRACKER
ME1/1
CRAFT: Software Trigger
• Two segments from CSC stations as minimum (ME1/1 +some other)
• Track is in tracker
• Signals from HE track association towers
• 17≤HETOWER≤29
• 60 ≤Track Slope ≤ 500
• Momentum ≥ 7GeV
• Track intersects front/backplane of HE
• For 0T track is in CSCs and DTs
CTHEME1/1
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CMSSW_2_2_3/Cosmics/Commissioning08_CRAFT_ALL_V4_ReReco-v1/RECONZS mode
CRAFT: HE- Data
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B=3.8T
B=0T
CRAFT: HE Signal vs Magnetic Field
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E(3.8T)/E(0T) vs Energy cut
1.00327x1.08=1.0835 (±.0125)Due to tick of layer 0
CMS magnetic field (3.8T) increases scintilator brightening up to 8.35 (±.0125) %
Plans
• CRAFT08 Re-reprocessing data analysis
• CRAFT09 data analysis (Traker+ES+HE)
• HE calibration testing with CSC data
• HE timing (?)
• Simulation
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HE and EMU Combined Operation( Beam Halo data)
• Introduction• HE Energy deposition • ME timing study with HE response•Conclusion
Vladimir KarjavinPeter Moisenz Alexey KamenevVardan KhachatryanCSC DPG+Commissioning meeting, 16 October, 2008, CERN
Beam Halo Data and CSC Timing
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1st Beam Halo Signals in HE
• Software Muon Trigger from CSC • Two segments from CSC stations as minimum
(ME1/1 +some other)• Signals from HE towers associated track
• 17≤HETOWER≤29
• Track Slope ≤50
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Beam Halo Signals in CSCsCSC Rechits (belong to tracks) distribution
All CSC ME1/1 is active
Asymmetry in x, y axis
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Beam Halo Signals in CSCs Track Slope Distribution
Beam halo tracks “source” distance: z≈-56m
56m is here
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Beam Halo Signals in HEHE Energy Deposition
HE energy deposition associated with CSC tracks
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Rechits collection criteria: HE towers associated with CSC track
HE Energy Deposition with Beam Halo Data
Good matching of the Beam test results
TB07µ 225GeV
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HE Timing from Splash Events
HE- HE+
J. Damgov
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Raw Signal from HE Towers (sum in 10 time slices)
Cut for muons = 8ADC
Single tower has muon signal if sum of amplitudes (in 0÷9 time slices) >8ADC
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CSC Timing with HE+
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CSC Timing with HE-
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Summary
HE energy deposition associated with CSC tracks:
good matching of the results obtained with Beam test and Beam halo data
Analysis of ME timing with Beam Halo tracks shows:• timing distribution (mean value) from all ME stations: ~ 1BX• possibility of precise time calibration of ME chambers
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ME1/1b, ME2/1 and ME3/1 Spatial Resolution from CRAFT data
Vladimir Palichik, Peter Moissenz, Dubna, JINR
CSC DPG meetingMarch 05, 2009
CSC Spatial resolution
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ME1/1b, ME2/1 & ME3/1 Spatial Resolution from CRAFT data
4 methods to estimate CSC resolution:
I) Studentized residuals between a strip hit coordinate in the plane and the fitted track coordinate in this plane from a straight line uniformly precise 6-point fit (is used for ME1/1b; is not convenient for ME2 & ME3 due to strip staggering)
II) Residuals between a strip hit coordinate in the 3rd (4th ) plane and the predicted track coordinate in this plane from a straight line fit of hits in the remaining 5 planes
III) distributions for Residual Sum of Squares (RSS) for all 6 hits line fit (as it was shown at the meeting on 29.01.09, the results obtained were underestimated)
IV) Two independent (separate) 3-point fits in two strip regions (see page 7)
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ME1/1b Resolution from CRAFT
Method I
b = 112 m per Layer
In comparison to the results presented at CMS Week in Dec.2008 we use the more soft thresholds for criteria
b ~ 50-55 m per Station
i.e.:
ME1/1b
ME1/1b Spatial Resolution after additional cross-talk corrections (see 08.12.08 report at CMS Week)
= 1.87 % of strip width
Resolution versus Radius
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ME2/1 Residuals from CRAFT for 2 regions across a strip width
Strip region 0.25-0.5 (strip edges)
Strip region 0-0.25 (strip center)
2= 580 m
= 328 m
Method II (shown 29.01.09)
Similar results have been obtained for ME3/1
1/(Station) = 3/
As in CMS NOTE 2007/023, V.Barashko et al.
= 166 m
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ME2/1 Studentized Residuals for 2 regions across a strip width
Method IV
The similar results have been obtained for ME3/1:
1/(Station) = 3/
= 133 m
= 252 m 2= 560 m
Strip region 0.25 - 0.5 (strip edges)
Strip region 0 - 0.25 (strip center)
Si – square of i-th Gaussian
s
ss
g12 +
ss
sg2
2
= 126 m
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Conclusions: ME1/1b
The satisfied ME1/1b single layer spatial resolution (112 microns) has been obtained from CRAFT data with 3.8 T magnetic field in CMSSW_2_2_0 (several improvements with additional cross-talk corrections) applying the more soft Chi2 cuts (in comparison with Dec.08 CMS Week report); studentized residuals have been used. Thus, ME1/1 outer part spatial resolution per station could be estimated approximately as 50-55 microns.
There are still problems with estimation of ME1/1 inner part resolution due to strip ganging.
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Conclusions: ME2/1 & ME3/1 2 methods (II-nd and IV-th) have been used to estimate
spatial resolution in the ME2/1 & ME3/1 stations from CRAFT data with 3.8 T magnetic field in CMSSW_2_2_0 :
II) Residuals between a strip hit coordinate in the 3rd (4th ) plane and the predicted track coordinate in this plane from a straight line fit of hits in the remaining 5 planes:
(ME2/1 station) = 166 microns
(ME3/1 station) = 176 microns
IV) Two 3-point fits in central & edge strip regions separately with studentized residuals:
(ME2/1 station) = 133 microns (ME3/1 station) = 126 microns
Plan CSC spatial resolution with uncorrelated
background
We suppose these results are overestimated
ME1/1 internal alignment with MTCC data (status and plans)
I. Belotelov, A. Kamenev, P. Moisenz (JINR, Dubna),
EMU ME1/1 Meeting,
16.06.07, CERN
CSC Internal alignment
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Outer layer fix: method details
• Select segments with 2 rec hit in outer layers
• Construct the straight line using these 2 outer hits
• Collect the residuals in 4 inner layers.• For misalignment studies, residuals
are collected to 10 histograms per layer (10 ρ-slices per each layer)
• each ρ-slice fitted by gaussian to estimate its shift• all shifts of ρ-slices in layer then
fitted by straight line - it gives layer φ-shift and rotation around z
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Outer layer fix: layer shift distribution vs MF
• Layer shifts up to 100 of microns, few layers shifted by > 200 microns
• There are clearly detectable -rotations
• Good correspondence with K. Banicz (MTCC) and A. Korytov (FAST sites) results (CSC DPG Meeting, CERN 15.03.07)
• Depending on the selection and track model (polar or cartesian) overall shift for B-on runs sometimes 10-15 microns bigger than for B-off runs.
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LSQ track fit: coordinate system
The local reference frame XY of each layer is rotated by angle α and than shifted in general reference frame XY. So internal alignment parameters are angle α and shifts Dx and Dy.
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LSQ track fit: formalismHere are some formulas:
xi
xi
tij bjzaX y
iyi
tij bjzaY
5
0
2
jj bajzX
mmz 22
- functional for best track building
- distance between layers
- best track hits
N
i j yj
jjijjijtij
xj
jjijjijtij yXYYxYXX
1
5
02
2
2
2 ))sin()cos(())sin()cos((
- alignment functional
0
0
0
j
j
j
y
x
- set of equations, to be solved)sin()cos( jjjj
tjj YXXx
)sin()cos( jjjjtjj XYYy
Shifts expressed through rotation angle
0)sin()cos(
11)sin()cos(
11)(sin)(cos
2222
22222222
22
xj
jtjj
t
yj
jtjj
t
jxj
jt
jtj
yj
jtjj
t
j
jjjjyjxj
jjjjjyjxj
jj
XXXXYYYYYXYXXYXY
YXXYYXXY
- equation for the rotation angle
NXXN
iijj /)(
1
NYXXYN
i
tijijj
t /)(1
- notation example
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LSQ track fit: alignment parameters vs magnetic field
Here are the shifts and rotations for all the 6 layers of all the 6 CSCs for magnetic field 2T, 3.8T, 4T relative the shifts and rotations at 0T. There is no evident dependence.
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Conclusion
• Internal alignment parameters of ME1/1 CSCs from MTCC data were calculated
• There is no evident dependence of alignment parameters from magnetic field
Plan Internal alignment parameters stability from
MTCC up to CRAFT Internal parameters for all CSCs
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Remote Analysis at JINR
• Monitoring and Analysis Remote System– Remote monitoring of ME1/1 and HE– Express analysis– DQM– Shifts
• MARS hardware– Server (6TB)– 3 PC (3x.5TB)– 6 (6x.5TB) remote points for physicists (with afs)
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