Transcript KEK Analysis Report Makoto Yoshida Osaka Univ. 2006/06/10 MICE CM15 Contents • Integration work towards G4MICE • Introduction to KEK beam test • We have two independent.

KEK Analysis Report
Makoto Yoshida
Osaka Univ.
2006/06/10
MICE CM15
Contents
• Integration work towards G4MICE
• Introduction to KEK beam test
• We have two independent analyses
– Hideyuki’s
– Aron’s in the framework of G4MICE
KEK Beam Test
•
•
•
Schematic view of detectors
KEK beam test was performed on
located in the beam line
September 30th to October 7th in
2006 at KEK-PS p2 beam line with
the collaboration of UK, US, Europe
and Japan. Main purpose is to
confirm the performance of SciFi
tracker in 1-Tesla solenoid field.
Prototype SciFi tracker
– SciFi tracker is consists of 4
stations, and there are 3 views
for station B,D and 2 views for
station A,C.
VLPCs
– Photon signals from Scintillating
fiber were readout by VLPCs.
– We used two VLPC cassettes.
One of them has high gain and
the other has low gain.
– VLPCs were cooled down to 9K
by a cryocooler.
Prototype SciFi Tracker
with 4 Stations
Setup
Readout System
Before installing waveguides
AFE Board
P2 Beam Line
JACEE MAGNET (B=1T)
TOF hodoscope
Cryocooler
BEAM
Low Gain High Gain
Cassette Cassette
Sci-Fi Prototype
Prototype Tracker consisted of 4 stations.
Stations B & D - 3 Views
Stations A & C - 2 Views
Readout - VLPCs, AFEII, Cryostat.
X View
V View
W View
Station D
2,500 ppm 2,500 ppm 5,000 ppm
Station A
mixture
Station C
5,000 ppm 5,000 ppm
Station B
5,000 ppm 2,500 ppm 3,500 ppm
5,000 ppm
Event Selection
• To ensure that a pion surely
passes through SciFi tracker,
PID by TOF of D1 and D2
counter are required.
• Integration window in Trip chip
is measured. Time difference
from the beam trigger is
restricted to reject events in
which beam particles are not
synchronized to Trip gate.
TOF
D1
SciFi
STATION B
STATION A
D2
STATION C
STATION D
View alignment
among stations
D C
BEAM
3 GeV/c p
Station B
View V
Fiber #
View X
View W
Residual
A
B
View Alignment
Station D
View V
Fiber #
View X
View W
Residual
Search for center fiber
• In order to find combination of crossing of fibers of 3 views,
adjustment is done by shifting X-view by same amount.
– Down figure shows the results after shifting by -20 fibers.
W view
#101
V view
#101
X view #81
Pitches for Station D
• DATA shows fiber pitch is 420 mm on all stations
• Inspection of 4th Station “D” confirmed 420 mm
pitches.
Difference of fiber#
V View
Red = 427 mm
X View
Black = 420 mm
W View
Fiber#
MICEModel work in G4MICE
• Representations of the model are produced for
specific purposes (Simulation, Reconstruction,
Visualisation…).
• The Model allows us to have the same geometry for
the Reconstruction of Data and Geant4 Simulation,
so that they can be compared.
• Configuration files have also been implemented,
which list the material, location and orientation
etc. of each module in the MICEModel (TOF,
SciFi…) with respect to the other modules.
G4MICE Status
• The TOF Decoding, Cabling & calibration files & code have now
been written and used in G4MICE.
• Atsushi’s time walk corrections have been used and
implemented into G4MICE.
• The TOF Reconstruction code has now been produced including
“TofSlabHits” & ”TofSpacePoints”.
• VLPC decoding used is that from Osaka (jp map 12).
• VLPC calibration used is that made by Malcolm in November
2005.
• Common Mode Noise algorithm updated (use similar technique
to that described by Hideyuki).
• Clustering algorithm unchanged (2.0 PE total light in a cluster,
neighbouring hits are summed).
• Space point code now takes into account arbitrary rotations
and misalignments (no longer requires trackers to be
perpendicular to the Z axis!).
• Track reconstruction used for this analysis not final one.
MICEModel Set Up of KEK Test Beam
TOF Hodoscope
(Blue & Green Slabs)
Pb Diffuser
T1 & R1
Counters
Solenoid (White)
ACC
MICEModel Set Up of KEK Test Beam
T1 Counter
R1 Counter
Pb Diffuser
ACC
MICEModel Set Up of KEK Test Beam
TOF Analysis 1
Black: 3 GeV/c
Red: 325 MeV/c
Blue: 250 MeV/c
TOF Selection
“High P”
“Low P Electrons”
“Low P Muons”
Sci-Fi Summary 1/2
Low mom. m
Low mom. e
High mom.
Station A Plane V
9.51
8.14
8.00
Station A Plane X
9.98
8.12
7.98
Station B Plane V
9.13
8.21
7.22
Station B Plane X
8.37
7.31
7.21
Station B Plane W
9.74
8.73
8.58
Station C Plane X
9.74
9.41
9.18
Station C Plane W
11.0
8.76
8.86
Station D Plane V
5.96
4.48
3.57
Station D Plane X
5.98
5.15
4.49
Station D Plane W
5.02
5.28
4.28
Light Yield –X view
8.0 0.2
10.2 0.2
8.9 0.3
4.7 0.2
15.0 0.4
18.6 0.4
8.5 0.6
Light Yield Summary
Light Yield Light yield
3GeV/c
1GeV/c
protons
p-
Ratio
p/p-
Station
View
Gain of
cassette
3HF
concent.
B
X
LOW
5000
7.9
15.0
1.9
B
V
LOW
2500
8.6
15.6
1.8
B
W
LOW
3500
9.8
16.9
1.7
A
X
LOW
5000
10.3
18.6
1.8
A
V
LOW
5000
9.1
15.3
1.7
C
X
HIGH
mixture
8.8
---
---
C
W
HIGH
5000
8.9
---
---
D
X
HIGH
2500
4.7
8.5
1.8
D
V
HIGH
2500
4.8
9.1
1.9
D
W
HIGH
5000
5.1
9.4
1.8
Beam Profile –MC and
DATA
Horizontal RMS (cm)
Vertical RMS (cm)
DATA
10.0
10.0
MC
10.0
10.0
Pt,Pz Distribution --MC
Station @X view
D
C
A
B
Pt (MeV/c)
28.5 (8.6)
29.0 (9.7)
29.4 (10.3)
29.4 (10.0)
Pz (Mev/c)
227.2 (2.3)
226.8 (2.4)
226.4 (2.4)
225.9 (2.4)
Momentum shift can be seen due to non-uniform magnetic field upstream
Reconstructed
Distri.
--MC
muon
PT distribution
MeV/c
PZ distribution
MeV/c
Reconstructed mom.
DATA
MC
Pt (MeV/c)
28.3 (10.3)
30.1 (10.3)
Pz (Mev/c)
230.7 (26.7) 233.7 (19.7)
Chi2 Distribution
In this analysis, position resolution is assumed to be 1mm
(should be 0.4mm)
DATA
MC
Mean 2.8
Mean 1.8
RMS 2.3
RMS 1.6
DATA has little more broad distribution than MC. It could be
caused by noise in DATA, mismatch of injected beam, …
Summary
• We have confirmed basic performance and
capability to measure transverse / longitudinal
momentum of low momentum muons.
– Analysis on details are on the way to check two
independent analyses
• Analysis tools integrating TOF and other beam
counters are implemented in G4MICE
framework.
• Test each stage of the Reconstruction (hits, clusters, points,
tracks, matching) using the Geant4 simulation of test beam.
• Test Reconstruction of real data (TOF & SciFi).