Transcript SciFi Tracker – SW Status & Plans Julia Sedgbeer for Ed McKigney Imperial College London  General SW status  Simulation & Reconstruction  Performance Studies & Plans  Test.

SciFi Tracker – SW Status & Plans
Julia Sedgbeer for Ed McKigney
Imperial College London

General SW status

Simulation & Reconstruction

Performance Studies & Plans

Test Beam

Resources

Summary
…. Plans concentrate on now till October 2003
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
1
SciFi
Engineering representation – 5 stations
a) Ribbon doublet structure
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
b) u-v-t fibre plan
2
Questions from Review Panel

Fibre tracker
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It seems essential to perform a full simulation of a tracker
with five planes, including nominal inefficiency and assessment
of the redundancy by simulation of the loss of readout— dead
fibres. The impact of noise and misalignment should also be
assessed. What is the status of this simulation?
Because of the cost saving by multiplexing, it is important to
repeat the simulation in a realistically multiplexed
arrangement.
Will the main alignment be derived from “straight through”
muons?
Some documented information on the performance of the
fibre tracker in the MUSCAT experiment would be useful.
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
3
General SW Status
Simulation
feature
(Ed Mckigney)
status
5 stations

Electronic noise

Dead Channels
~ implemented
Multiplexing
Misalignment
Julia Sedgbeer

displacements

rotations

‘nominal’ SciFi ‘ideal’ SciFi
simulation
simulation
0 (> 2 p.e.)
0
0.25%
0
71
none
0
0
Mice Collaboration Meeting, June 2003
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General SW Status

Electronic Noise

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Cross talk
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Experience at DØ – no cross talk – verified by HW tests
Dead channels
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Experience of VLPC’s at DØ – no noise above 2 p.e.
Experience at DØ – 77,000 channels
200 compromised fibre channels – 0.25%
190 compromised VLPC channels – 0.25%
Alignment

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Experience at DØ – 835 μm fibres
Precision of fibre mounting ~35-40 μm
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
5
DØ fibre tracker - VLPC performance
(A.Bross)
VLPC (Visible Light Photon Counter) –
Cryogenic APD @ 9K
VLPC HISTE VI
–High QE 80%
–Low noise <5X104 Hz (@1.0 pe)
–High Rate capability
>40 MHz
–High production yield
70%
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
6
General SW Status
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Reconstruction
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space point algorithm – require hits in 3 views of 1 station
(triplet)
track finder requires 4/5 or 5/5 triplet points
track fit includes energy loss
tracking efficiency & purity already v. good
(Ed Mckigney, Oct 2002, Berkeley)
Grid

Job submission to Grid exists (IC - EDG) – being automated
(web interface – K.Georgiou)
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RF background simulation

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So far used uniform distribution parallel to axis – vary rates
Improved model being implemented (Yagmur Torun)
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
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Performance studies & plans

Done
Lower priorty
(Ed Mckigney)
Important
study
‘ideal’ SciFi
‘nominal’ SciFi –
(MUX & dead chn)
except study params
RF bkg

MUX

Dead Channels
Misalignment
RF & dead chn.
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
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RF bkg studies - pt resolution
Distributions
from the
Berkeley
meeting
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
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MUX studies - pt resolution
MUX 7  1
reduces
pt resolution
by ~2
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
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Performance studies & plans
Reconstruction plans – low priority

Space points


allow points made from hits in 2 out of 3 views in a station
(doublets)
Track finder

allow limited number of double points per track
Grid plans – priority? – need input from collab.

Extend grid access to MICE collaboration
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
11
Test Beam
Plan ..
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Single station prototype
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Cosmic ray test FNAL – September 2003
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Determine:

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Light yield at VLPC – sufficient to allow noise rejection?
Cross talk – small?
(Also demonstrate multiplexing and precision of fabrication)
…. compare results with simulation
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
12
Resources
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Computing
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Some access to Grid farms in IC/HEP and LeSC
Adequate for studies to be done this summer
Manpower
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Ed Mckigney replacement:
– shortlist
- expect appointment in July
- test beam commitment
SW: A.Tapper (IC), A.Khan (Edinburgh), J.Sedgbeer (IC),
P.Kyberd (Brunel), grad student from Oct. (IC).
Grid: K.Georgiou (IC), D.Colling(IC)
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
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Summary

SW simulation & reconstruction

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Computing resources

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adequate resources available
Manpower resources
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most of the functionality required is in place
losing Ed – will be replaced
… but test beam commitment
plus some extra manpower for SW & Grid
Aim to complete required SW studies by October
Julia Sedgbeer
Mice Collaboration Meeting, June 2003
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