KEK TPC Test Beam June 22 nd - July 1 st , 2005
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KEK TPC Test Beam June 22 nd - July 1 st , 2005 X Resolution Study (Ar/iC4H10)(95/5) Magnetic Field: B = 0, 0.5 and 1T Khalil Boudjemline Carleton University, Ottawa KEK, Tsukuba, July 1 st , 2005
description
KEK TPC Test Beam June 22 nd - July 1 st , 2005. X Resolution Study. (Ar/iC4H10)(95/5). Magnetic Field: B = 0, 0.5 and 1T. Khalil Boudjemline Carleton University, Ottawa. KEK, Tsukuba, July 1 st , 2005. PAD RESPONSE FUNCTION. B = 0T. PRF for different drift distances. No beam. - PowerPoint PPT Presentation
Transcript of KEK TPC Test Beam June 22 nd - July 1 st , 2005
KEK TPC Test BeamJune 22nd - July 1st, 2005
X Resolution Study(Ar/iC4H10)(95/5)
Magnetic Field: B = 0, 0.5 and 1T
Khalil BoudjemlineCarleton University, Ottawa
KEK, Tsukuba, July 1st, 2005
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PAD RESPONSE FUNCTION
cmmMagCd /469.)(
PRF for different drift distances
No beam
B = 0T
Preliminary results
cmmFitCd /)2.9535()(
zCdPRFPRF 220
2
3
PAD RESPONSE FUNCTION
PRF for different drift distances
No beam
B = 0.5T
Preliminary results
cmmMagCd /285.)( cmmFitCd /)52.6297()(
zCdPRFPRF 220
2
4
PAD RESPONSE FUNCTION
cmmMagCd /193.)(
PRF for different drift distances
No beam
B = 1T
Preliminary results
cmmFitCd /0)(
zCdPRFPRF 220
2
5
X Residual Mean and X Residual Sigma vs PadRows
Mean
Sigma
B = 0T B = 0.5T B = 1T
B = 0T B = 0.5T B = 1T
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X Resolution vs Z B = 0T
B = 1T
eNeff 34
cmmMagCd /469)(
cmmMagCd /285)(
cmmMagCd /193)(
cmmFitCd /)8513()(
mFit 206)(0
cmmFitCd /)10341()(
mFit 242)(0
cmmFitCd /)31243()(
mFit 178)(0
Preliminary results
Rows8B = 0T
B = 0.5T
B = 1T
Fit
Magboltz
12/3.2 mm
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X Resolution vs Z (How to fit?)
effx N
zCd
22
02
DiffusionOther
0: resolution w/o diffusion.Cd: diffusion coefficient.Neff: number of electrons.
Diffusion
only eff
xN
zCd1
1- fix Neff from MC
2- fit x = f(z) with 0 and Cd free
3- Plot Magboltz curve with:0 obtained from the fit (2). Cd is known.Neff from (1).
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Primary and secondary electrons and Neff calculation
Statistics of primary ionization (Poisson)
n: averagek: actual number
pNk
pnk e
k
NP
!
Cluster Size Distribution
Probability to obtain ne per interaction
MIPpp dxdE
dxdEcmMIPNN
)/(
)/()cos1(6.0/)()(
eN
1
eN
eNeff 44
eN
1
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SIGNAL ON THE MESH
Signal on the mesh 55Fe + beam
4 GeV/c beam
3
9.5
3
9.5
dkeV
dkeV
PP
PP0dP
29.59.5
keV
Beam
keV
Beam
Ne
Ne
P
P
55Fe 5.9 keV
(Landau)
eWW
E
W
ENe
HiCAr
IronIronkeV 225
05.095.0 1049.5
eP
PNeNe
keV
BeamkeVBeam 450
9.59.5 For 7.5 cm track
From Monte-Carlo 450e (MIPs)
eNeff 34
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ENERGY LOSS
4 GeV/c MIP
20%
.. ionexctotal dx
dE
dx
dE
dx
dE
