Transcript Sci-Fi Tracker Performance • Software Status – RF background simulation – Beam simulation – Reconstruction – Data sample • • • • Performance Emittance calculation Performance Summary Tracker document M.

Sci-Fi Tracker Performance
• Software Status
– RF background
simulation
– Beam simulation
– Reconstruction
– Data sample
•
•
•
•
Performance
Emittance calculation
Performance Summary
Tracker document
M. Ellis - MICE Collaboration Meeting - Thursday 28th October 2004
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RF Background Simulation
• As described by Rikard at VC of 22/9/04
• Software used from tag mice-0-9-10
• Background generated in 100 jobs of 100
events each on CSF farm at RAL.
• Total time to produce 10k events on CSF
was over 4 days!
• Output files merged into one file that is then
used as input for each of the 10k event
samples.
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TURTLE Beam
• Added as G4MICE option
• In CVS as tag mice-0-9-11
• 720,000 events produced using the
“June04” configuration were provided by
Kevin Tilley
• Sample broken up into 72 sets of 10,000
events each for submission as jobs on
CSF farm at RAL
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Reconstruction
• TDC aspect of Digitisation is now more realistic
(exact details of discriminators still to be
perfected).
• Duplets (space point made from 2 views in a
station) are now reconstructed and used in the
pattern recognition.
• Individual clusters are used as separate
measurements in the Kalman track fit.
• Still need to add the use of a field map
(particularly with the more detailed simulation now
in use) – currently assuming a fixed field!
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Data Sample
• Four sets of events processed:
– Various sets of 20k events to study effects of multiple
scattering, non-uniform field, etc...
– 720k events with all physics processes, but no RF
background
– 720k events with all physics processes and overlaid
RF background events
– 7k events with 100x nominal RF background
• All performance plots are from the sample with
nominal RF
• A summary table at the end will show differences
between performance with and without RF
background
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Performance
• Position resolution
– X, Y
• Momentum pulls
– PX, PY and PZ
• Momentum resolution
– PT, PZ
– sPT versus PT, sPT vs PZ
– sPZ versus PT, sPZ vs PZ
• “Primes” resolution
– X’, Y’, T’
• Efficiency and Purity
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X Position Resolution
RMS = 48.49 mm
RMS = 0.391 mm
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Y Position Resolution
RMS = 57.05 mm
RMS = 0.392 mm
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PX PY and PZ Pulls
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Resolution vs PT
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Resolution vs PZ
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X’ Resolution
RMS = 182.1 mrad
RMS = 8.00 mrad
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Y’ Resolution
RMS = 172.3 mrad
RMS = 7.91 mrad
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T’ Resolution
RMS = 5.48 x 10-2
RMS = 5.06 x 10-3
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Efficiency vs PT
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Purity vs PT
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Emittance Calculation
• Analysis code developed by Chris:
– Trace and phase space
– Monte Carlo truth, reconstructed parameters, virtual
planes, ICOOL output files...
– Can calculate 2D, 4D, 6D emittance, apply cuts, reweighting, etc...
– Performance checked against ecalc9f
• For each 10,000 event run, calculate one value
of emittance from Monte Carlo truth information
and one from reconstructed track information.
• Determine resolution and bias in 4D (XY)
emittance (TOF unavailable, hence no 6D
emittance).
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Emittance Resolution
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Performance Summary:
RMS of
True
RMS
resolution
(no RF)
RMS
resolution
(with RF)
RMS
resolution
(100x RF)
% RMS/RMS
(no RF)
% RMS/RMS
(with RF)
% RMS/RMS
(100x RF)
X (mm)
48.49
0.390
0.391
0.384
0.80
0.81
0.79
Y (mm)
57.05
0.391
0.392
0.389
0.69
0.69
0.68
PT
(MeV/c)
28.65
1.75
1.75
1.69
6.11
6.11
5.90
PZ
(MeV/c)
25.65
2.41
2.41
2.43
9.40
9.40
9.47
X’ (mrad)
182.1
8.02
8.00
8.08
4.40
4.39
4.44
Y’ (mrad)
172.3
7.90
7.91
7.58
4.59
4.59
4.40
t’
(x10-3)
5.48
0.506
0.506
0.519
9.23
9.23
9.47
Efficiency in %
Efficiency out %
Purity in %
Purity out %
e4D bias %
e4D resolution %
No RF
99.99(85)
99.81(17)
99.15(12)
99.17(66)
-0.121
0.060
With RF
99.99(85)
99.83(43)
99.13(14)
99.17(57)
-0.138
0.062
100x RF
100.(00)
99.(73)
95.(28)
96.(47)
N/A
N/A
Tracker Document
9 Items to be addressed:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Sensitivity to RF generated background
Detector/Electronics sensitivity to RF
Tracking performance
G4MICE running conditions
Experienced design
Safety and integration
Cost breakdown
Schedule and key milestones
Operation
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Sensitivity to RF Background
•
•
•
•
•
•
Response of sensitive materials to known
sources of X-rays and spurious electrons
measured? YES – rates measured in Lab G
Performance of pattern recognition and trackfit demonstrated by simulation? YES
Which simulation of beam? TURTLE (June04)
Which simulation of background? mice-0-9-10
Effects of integration time included? YES
Photon interactions included? YES
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Detector/Electronics and RF
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•
•
•
•
Measurements of the noise level at 805 MHz in
Lab G? No, but it was done with 201 MHz
Measurements of the noise level at 200 MHz
at CERN? Not necessary
Comparison between “200 MHz” and “805
MHz” Yes
Measurements of noise levels on mains?
Not necessary
Common extrapolation procedure to conditions
at RAL? No
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Tracking Performance
•
•
•
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Detection of charged particles in presence of
X-rays and RF noise? Not experimentally
Does it handle the rate? YES
Protocol of calibration? YES
Results from Simulation
–
–
–
–
Resolution and bias in PT YES
Resolution and bias in PZ YES
Resolution and bias in e4D and e6D Partial – 4D
Sensitivity of biases to alignment, multiplexing, Xrays Done
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G4MICE Conditions
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•
•
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Beam momentum? TURTLE (June04)
Beam intensity? TURTLE (June04)
Momentum at MICE detector? TURTLE
(also checked with G4BL)
Which rate of dark current (including a
safety factor of 2 orders of magnitude)?
RF simulation of mice-0-9-10, nominal
and 100x nominal rate
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Experienced Design
•
Did it operate already
– In an experiment? YES – D0
– As a prototype? YES – FNAL (KEK soon)
•
If yes, how far is this expertise
transferable to MICE? Tracker group
includes Sci-Fi experts from D0 and
Japan
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Safety and Integration
•
Description of the interface with the cooling
section YES – see TRD:
–
–
–
–
–
Tracker is totally passive
Only active components are Hall probes
Vacuum is only safety issue: optical feedthrough and patch panel must be rated for
pressure
Readout system only requires standard line
voltage
The cryogenic system presents no cryogen or
oxygen deficiency hazard
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Cost Breakdown
•
YES - see MICE note
– Cost and schedule recorded in detail in the
MICE WBS:
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Schedule and Milestones
•
YES - see MICE note
– Cost and schedule recorded in detail in the
MICE WBS:
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Operation
•
Manpower needs for operation: YES - see
MICE note
– Tracker group consists of 25 people from
Japan, UK, Europe and USA
– Through successful prototyping exercises
we will develop the expertise
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Conclusions
• Prototype performance has been described in previous
meetings:
– Light yield, dead channels, space point resolution and efficiency
as expected
• Performance in G4MICE shows better than 10%
RMS/RMS in all variables (performance at 2.5 p mm rad
to come soon)
• Efficiency and purity are better than 99%
• Demonstrated ability to cope with 100x nominal RF
background rate
• Demonstrated ability to cope with non-uniform magnetic
field at 1% level
• Made emittance measurement with resolution better than
0.1% (bias still to be understood and fixed)
• Answered all significant questions in the tracker choice
document.
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