KEK analysis 2 prototype SciFi tracker analysis

1
KEK analysis 2prototype SciFi tracker analysis

• Osaka University
• Atsushi Horikoshi

2
contents

• Basic information
• Dead channel information
• Noise rate
• w/o magnetic field
• Event slection
• Npe distribution
• position resolution
• w/ magnetic field test
• The procedure of helical fit
• non uniformity of magnetic field
• pz
• pt
• Appendix detail plots (page 34 page 68)

3
The structure of proto SciFi tracker
st B , st D 3 view st A , st C 2 view Total
10 view
Length 95cm
4
Checking scheme of dead channel

• Counting numbers of dead channels
• Dead channel No events over 2.5 p.e.
• Dead is categorized by two
• VLPC dead Also dead _at_ LED run
• Fiber dead Alive _at_ LED run
• Total dead channel VLPC dead Fiber dead
• Fiber connection is based on Mapping table of
• jp-map12.xls

5
VLPC dead

• 40 channels were dead

6
AFE107,MCM8,CHAN1-32

• Dead
• -3GeV/c mag off , no rotate
• 1255,1257,1259,1272,1273
• 400MeV/c mag on , rotate 6
• 1344,1346,1348,1350,1352
• 400MeV/c mag on rotate 3
• 1384,1386,1389,1391,1393,1395,1397,1399
• 325MeV/c mag on , rotate 6
• 1374,1376,1377,1379,1381,1382,1401,
• 1403,1405,1407,1408,1410,1411,
• 1334,1336,1338,1340,1342
• 325MeV/c mag on , rotate 3
• 1334,1336,1338,1340,1342
• 250MeV/c mag on , rotate 6
• 1318,1320,1322,1324,1326,1328,1330,1332
• 250MeV/c mag on , rotate 3
• 1356,1358,1360,1361,1363,1365,1367,1368,1370,1372
• Alive
• -3GeV/c rotate 6

7
Fiber dead

• Fiber dead 2 fiber
• Station D (new station) no dead fiber

8
Noise rate

• ex)stationB Uview
• of hit fibers/event

9
noise rate

• noise rate of hit fiber/(event fiber)
• therathold ex) st1 V view
• Threathold 2.5p.e.

10
w/o magnetic field

• Event selection
• Npe distribution
• Residual distribution
• Position resolution

11
Event selection

• Area cut for station B D
• Hit event from ?

2
12
pe distribution

• 3GeV/c , p
• ex) station B V view

of event
Npe
13
pe distribution

• Efficiency
• Previous talk of KEK analysis
• H.Sakamoto
• ex)threathold2.5pe
• station B X view96.0
• stationD X view85.7
• Decrase of Npe_at_ station D
• Light loss Investigation
• A.Fish

14
Residual distribution

• p 3GeV/c , no magnetic field , w/o diffuser
  (run1255)
• Plot procedure
• Line fit using 3 stations w/o target st.
• ex) targetstation B
• line fit using station A,station C, and
  station D
• Hit position-fit line _at_target st

-
15
Residual distribution

• station D , x axis
• SciFi pitch
• left 0.420mm
• right 0.427mm

RMS 0.74mm
RMS 1.21mm

• station D 0.420mm or 0.427mm ? which is true ?

16
Residual distribution of station D

• pitch0.420mm
• x axis0.74mm , y axis0.55mm
• pitch0.427mm
• x axis1.21mm , y axis1.24mm
• MC simulation
• x axis0.64mm , y axis0.67mm
• ?0.420mm pitch is true ?

17
Position resolution

• position resolutin of target station
• error of line fit

position resolution (mm)
18
w/ magnetic field

• Time of Flight
• The momentum distribution from TOF
• SciFi tracker
• pz analysis
• pt analysis

19
s of Time of Flight

• 3GeV/c, rotate 0 , p
• s(TOF)60ps
• 250MeV/c , rotate 3 , µ
• s(µ)152ps , s(beam)140ps
• 250MeV/c , rotate 6 , µ
• s(µ)155ps , s(beam)143ps
• 325MeV/c , rotate 3 , µ
• s(µ)98ps , s(beam)78ps
• 325MeV/c , rotate 6 , µ
• s(µ)97ps , s(beam)76ps
• 400MeV/c , rotate 3 , µ
• s(µ)79ps , s(beam)51ps
• 400MeV/c , rotate 6 , µ
• s(µ)81ps , s(beam)54ps
• plots of Time of Flight_at_appendix

20
Momentum distribution from TOF

• ex)
• µ 250MeV/c 3
• Mean231.1MeV/c
• s7.1MeV/c
• Another plots
• _at_appendix

Momentum(MeV/c)
21
Momentum distribution from TOF

• 250MeV/c , rotate 3 , µ
• s(momentum)7.1MeV/c
• 250MeV/c , rotate 6 , µ
• s(momentum)7.2MeV/c
• 325MeV/c , rotate 3 , µ
• s(momentum)11.2MeV/c
• 325MeV/c , rotate 6 , µ
• s(momentum)10.9MeV/c
• 400MeV/c , rotate 3 , µ
• s(momentum)18.8MeV/c
• 400MeV/c , rotate 6 , µ
• s(momentum)19.0MeV/c
• plots from TOF_at_appendix

Red 3 Blue6
22
The procedure of tracking

• Helical tracking in magnetic field5parameters
• Fitting minuit
• pzcBL , ptcBR B(T)

23
uniformity of magnetic field

• The center of SciFi tracker is not center of the
  coil.
• Magnetic field
• _at_center of coil
• B 0.8T 1T
• We need to correct
• non uniformity of magnetic field

station A
station B
station C
station D
24
The procedure of correction

• Get the track from fitting.
• (assume the perfect helical orbit)
• Calculate the strength of magnetic fieled in each
  point.
• We used the average stregth of magnetic field
  from the result of tracking.

25
The strength of magnetic field

• The average strength of
• Magnetic field.
• The peak of B is 0.963T,
• not 1T.
• There are position
• dependence (next page)
• This plot is the result
• of data analysis

0.96
0.98
1.00
B(T)
26
The position dependence of average B

• The result of data analysis

27
The difference of analysis for B field

• MC simulation
• No multiple scattaring
• Redinput pz
• Blueaverage B
• Black1T
• The mean of average B is better than that of 1T.

250
pz(MeV/c)
28
The pz distribution

• RMS of pz
• 28MeV/c_at_250MeV/c
• The input beam of MC is now tuning.

29
RMS of pz vs pt

• 36 run , µ
• Data analysis
• pt Large gtgt pz RMS better
• pz Small gtgt pz RMS better

30
pz RMS vs magnetic field(MC)

• µ , 250MeV/c
• pz RMS
• non uniform
• 28MeV/c
• uniform
• 23MeV/c
• 4T
• 8MeV/c

non uniform B
uniform B
31
The distribution of pt

• µ , 250MeV/c
• pt RMS9.8MeV/c

32
The acceptance of each region(MC)

• Acceptancehit the all view / hit the TOF
• Horizontal
• Pt(MeV/c)
• Vertical
• Acceptance()
• Almost 100 acceptance
• for all pt is TOF3TOF8
• region.

27
28
29
37
38
39
49
48
47
33
Summary

• The dead channel are VLPC dead fiber dead
• VLPC dead 40ch , fiber dead 2ch
• There is no dead fiber in new station, station D.
• The distribution of pe is not poisson.
• The mean of pe
• station A,B,C 8pe , station D 4.5pe
• The residual distribution
• station D the pitch is 0.42mm ?
• The position resolution x axis 0.5mm , y axis
  0.4mm
• Momentum distribution of TOF
• s(momentum)7MeV/c19MeV/c
• pz of the reconstruction
• RMS28MeV/c_at_250MeV/c(data)?8MeV/c_at_250MeV/c(MC)
• pt of the reconstruction
• Acceptance only TOF3TOF8 region is 100
  acceptance.

34
Appendix more detail data

• Basic information
• Dead VLPC of AFE107,mcm8
• w/o magnetic field test
• Npe distribution of all view
• Residual distribution of all station
• w/ magnetic field test
• Time of Flight momentum distribution from TOF
• 250MeV/c , 325MeV/c , 400MeV/c
• Residual distribution of all station
• 250MeV/c , 325MeV/c , 400MeV/c

35
pt RMS vs magnetic field(MC)

• µ , 250MeV/c
• pt(track)-pt(true) RMS
• non uniform
• 1.9MeV/c
• uniform
• 1.7MeV/c
• 4T
• 0.6MeV/c

non uniform B
uniform B
36
Dead MCM

• AFE2107 , mcm8 , ch1-32
• st1w , fiber (AFE , mcm , ch)

37
Npe distribution of all view

• 3GeV/c p
• st1 V8.2pe
• st1 X(U)7.2pe
• st1 W8.3pe
• st1stB

38
Npe distribution of all view

• 3GeV/c p
• st2 V7.8pe
• st2 X(U)8.3pe
• st3 X(U)8.4pe
• st3 W8.7pe
• st2stA
• st3stC

39
Npe distribution of all view

• 3GeV/c p
• st4 V5.0pe
• st4 X(U)4.1pe
• st4 W4.8pe
• st4stD

40
Npe distribution of all view

• 3GeV/c , p
• Station D V view
• High gain VLPC
• Are there photon
• peak ?

41
Residual distribution of all station

• 3GeV/c p
• RMS
• st1 x1.57mm
• st1 y1.34mm
• st1stB
• st2 x0.70mm
• st2 y0.60mm
• st2stB

cm
42
Residual distribution of all station

• 3GeV/c p
• RMS
• st3 x0.69mm
• st3 y0.55mm
• st3stC
• st4 x0.74mm
• st4 y0.64mm
• st4stD

cm
43
w/magnetic field test

• Time of Flight momentum from TOF counter
• 250MeV/c , 325MeV/c , 400MeV/c
• Residual distribution
• hit position-helical track from fitting
• 250MeV/c , 325MeV/c , 400MeV/c

44
TOF , 3GeV/c p

• Time of Flight
• s60ps
• ?p/p of 3GeV/c p
• is very small.
• ?timing resolution of
• TOF counters is
• 60ps.
• T142ps
• TOFhodoscope41ps

Time of Flight(ps)
45
TOF , 250MeV/c 3

• s(e)72ps
• s(µ)152ps
• s(beam)140ps
• s(p)244ps

Time of Flight(ps)
46
TOF , 250MeV/c 3

• µ
• 231.1MeV/c
• s7.1MeV/c

Momentum(MeV/c)
47
TOF , 250MeV/c 6

• s(e)75ps
• s(µ)155ps
• s(beam)143ps
• s(p)245ps

Time of Flight(ps)
48
TOF , 250MeV/c 6

• µ
• Mean231.2MeV/c
• s7.2MeV/c

Momentum(MeV/c)
49
TOF , 325MeV/c 3

• s(e)70ps
• s(µ)98ps
• s(beam)78ps
• s(p)137ps

Time of Flight(ps)
50
TOF , 325MeV/c 3

• µ
• Mean306.4MeV/c
• s11.2MeV/c

Momentum(MeV/c)
51
TOF , 325MeV/c 6

• s(e)69ps
• s(µ)97ps
• s(beam)76ps
• s(p)139ps

Time of Flight(ps)
52
TOF , 325MeV/c 6

• µ
• Mean305.9MeV/c
• s10.94MeV/c

Momentum(MeV/c)
53
TOF , 400MeV/c 3

• s(e)65ps
• s(µ)79ps
• s(beam)51ps
• s(p)98ps

Time of Flight(ps)
54
TOF , 400MeV/c 3

• µ
• Mean382.2MeV/c
• s18.78MeV/c

Momentum(MeV/c)
55
TOF , 400MeV/c 6

• s(e)68ps
• s(µ)81ps
• s(beam)54ps
• s(p)101ps

Time of Flight(ps)
56
TOF , 400MeV/c 6

• µ
• Mean381.0MeV/c
• s19.03MeV/c

Momentum(MeV/c)
57
Residual distribution

• 250MeV/c 3
• µ1484evt
• st1,st2
• RMS
• st1
• x0.4048mm
• y0.3703mm
• st2
• x0.8422mm
• y0.5675mm

mm
58
Residual distribution

• 250MeV/c 3
• µ1484evt
• st3,st4
• RMS
• st3
• x0.6111mm
• y0.4889mm
• st4
• x0.7607mm
• y0.5853mm

mm
59
Residual distribution

• 250MeV/c 6
• µ932evt
• st1,st2
• RMS
• st1
• x0.4177mm
• y0.3110mm
• st2
• x0.9453mm
• y0.4249mm

mm
60
Residual distribution

• 250MeV/c 6
• µ932evt
• st3,st4
• RMS
• st3
• x0.6107mm
• y0.4599mm
• st4
• x0.8727mm
• y0.3764mm

mm
61
Residual distribution

• 325MeV/c 3
• µ3308evt
• st1,st2
• RMS
• st1
• x0.3669mm
• y0.2860mm
• st2
• x0.7673mm
• y0.4090mm

mm
62
Residual distribution

• 325MeV/c 3
• µ3308evt
• st3,st4
• RMS
• st3
• x0.5561mm
• y0.4629mm
• st4
• x0.7045mm
• y0.4390mm

mm
63
Residual distribution

• 325MeV/c 6
• µ1187evt
• st1,st2
• RMS
• st1
• x0.3980mm
• y0.2364mm
• st2
• x0.8484mm
• y0.3388mm

mm
64
Residual distribution

• 325MeV/c 6
• µ1187evt
• st3,st4
• RMS
• st3
• x0.6055mm
• y0.4327mm
• st4
• x0.7845mm
• y0.3483mm

mm
65
Residual distribution

• 400MeV/c 3
• µ3136evt
• st1,st2
• RMS
• st1
• x0.3586mm
• y0.2357mm
• st2
• x0.7142mm
• y0.3294mm

mm
66
Residual distribution

• 400MeV/c 3
• µ3136evt
• st3,st4
• RMS
• st3
• x0.5866mm
• y0.4351mm
• st4
• x0.6682mm
• y0.3706mm

mm
67
Residual distribution

• 400MeV/c 6
• µ1582evt
• st1,st2
• RMS
• st1
• x0.3748mm
• y0.2129mm
• st2
• x0.7998mm
• y0.2938mm

mm
68
Residual distribution

• 400MeV/c 6
• µ1582evt
• st3,st4
• RMS
• st3
• x0.5942mm
• y0.4164mm
• st4
• x0.7400mm
• y0.2910mm

mm