Detector Parallel Session

1
Detector Parallel Session
Video Conference Fri 13/6 830 Grichine EMCal
Simulation Update 0900 Bonesini TOF Update
Radicioni Rates at TOF0 0930 Gastaldi
TPG Status and Plans 1000 Sato KEK Test
Results/Plans 1030 Coffee 1050 Barber SciFi
Tracker Progress in Design, Prototype,
Plans 1110 Sedgbeer SciFi Tracker Software
Status/Plans 1130 Summers Tracker Choice
Ground Rules and Process 1200 Discussion
2
Introduction .. and summary

• Progress towards upgrade of the downstream bug
• downstream PID taylored to 300 MeV/c m
  (200 MeV Tkin )
• based on only existing old track
  files, so never adapted to 200 MeV/c (121 MeV )
• needs some
  serious rethink (by means of new track files
  !!!)
• 1000 muons throu G4MICE. a
  MUST !!! .. volunteer needed !!!

2) Short update from TOF ( B field tests, TOF 0
max rates ) NB TOF0-TOF1 may
well be only 6 m apart (B. Palmer) 3) Major
progress on both trackers !!!!!!!!!!!!!!!!!!!!
congratulations to
both teams next CM .
end of October ..
OK
CORRAL .. 4) Rules of the shoot-out (Summers
Gregoire)
3

1. Progress towards upgrade of the downstream bug

first semirealistic study of end region (PID) at
lower (200 Mev/c)
limited, not G4MICE yet. Grichine
EMCal Simulation Update the belt
(m-tag)
see
slides the art of e/m separation gets
different thinner slicing? ..
fully active detector? Need a G4MICE serious
study . PLEASE VOLUNTEER! 1000 m !
a proper first goal (and boost) for our
simulation software and effectiveness in
detailed detector design including
downstream Cerenkov the suspenders
(e-tag)
may prove embarassing, otherwise

4
2) Short update from TOF
SciPMT tests in B field set up at INFN-Mi
(Bonesini) up to 1 Tesla
12 cm gap warm magnet
results soon
.. NB good to keep at least
TOF0 away at 200
MeV/c TOF0-TOF1 may well be only 6 m apart
TOF 0 max rates (Radicioni)
up to 5 MHZ tolerable to DAQ
lower
limit certainly from PMTs , answer needed
5
3) Major progress on TPG tracker !!!!!!!!!!!
congratulations to
the TPG team 0930 Gastaldi TPG Status and
Plans see Radicionis slides small GEM
chamber prototype operational in Naples with
final front electronics
being equipped with a 10 cm
field cage test learning chamber
.. may make it to LAB G
big hopes . tagged Co Mn X-ray sources
full size MICE end cap being built
GEM amplification with hexaboard
read-out with final
front end electronics
to be adapted to full HARP 1.5 m field cage
in the CERN PS East Hall
(painful resurrection)
cosmic rays first beam traccino mid
September real MICE prototype ..
own 1 m field cage ready in 2004

6

• 3) Major progress on Sci-Fi tracker !!!!!!!!!!!
• congratulations
  to the Sci-Fi team
• 1000 Sato KEK Test Results/Plans
• lab tests reducing photon MFP
  (.460 mm) x-talk
• several new fibers
  delivered for studies of MFP much more
• 2 weeks of beam tests at
  KEK later this month
• 1050 Barber SciFi Tracker Progress in Design,
  Prototype, Plans
• prototypes of support of single
  stage of 3 fiber planes
• support of connectors
  AND connectors (7 fold multiplexing built in !!!
  )
• final
  carbon fibers structure in September
• 1110 Sedgbeer SciFi Tracker Software
  Status/Plans
• SW simulation reconstruction -- most of
  the functionality required is in place
• Computing resources -- adequate resources
  available
• Manpower resources - losing Ed will be
  replaced but test beam commitment
• plus some extra manpower for SW
  Grid
• Aim to complete required SW studies by
  October

7
KEK Test Results / Plans

• Akira SATO
• Osaka University, Japan

8
contents

• Cross talk of SCSF78
• Fiber optimization
• KEK plan
• Attenuation length
• Beam test

9
Cross talk for SCSF78
From last KEK beam test results

• Experimental data can be explained assuming that
  mean free path of primary photon is 460mm.

Expected of p.e. with 0mm MFP
1.0GeV/c p 1.0GeV/c proton
300mmf 1.92 p.e. 2.77 p.e.
500mmf 2.92 p.e. 4.21 p.e.
Experimental data
1.0GeV/c p 1.0GeV/c proton p/p ratio
300mmf 0.5 p.e. 0.8 p.e. 0.68
500mmf 1.2 p.e. 1.6 p.e. 0.75
dE/dx 1.8 MeV/cm 2.6 MeV/cm 0.7
Expected of p.e. with 460mm MFP
300mmf 0.55 p.e. 0.80 p.e.
500mmf 1.20 p.e. 1.72 p.e.
10
Optimization of 3HF fiber

• Alan estimated the mean-free path (MFP) for
  absorption by 3HF of the primary scintillation
  light from the primary dopant p-terphenyl (pT).
• The absorption can be expressed as
• I/Io 10-(????cd)
• ????? the molar extinction coeff. in (moles per
  liter-cm)-1 at wavelength ?
• c the concentration in moles per liter
• d the distance in cm
• Attenuation length for the primary dye emission
  via 3HF absorption
• 50mm for 1dye3HF(1500 ) D0 tracker
• 21mm for 1dye3HF(3500)
• Very short for 3HF(5000) w/o 1dye
• At high concentrations, 3HF acts like a primary
  dopant ie, its coupling the the fundamental PS
  excitation is quite strong.

11
KEK and Osaka Plan

• Scintillating fibers had been deriverd to Osaka
  Univ. June 3rd
• Standard primary(pT) 3HF(2500ppm)
• Standard primary 3HF(3500ppm)
• Standard primary 3HF(5000ppm)
• 3HF(5000ppm) only
• 0.35mmf, round, multi-clad, s-type
• We are planing to study
• Attenuation length
• Aging of bending fiber
• Light yield (beam test)
• Cross talk (beam test)

12
Attenuation length

• Measurement has just started.
• Cracks in fiber reduce light yield.
• Need some quality control

13
KEK beam test

• June 25th - July 2nd
• _at_ KEK p2 beam line
• Photon detector
• Hamamatsu R7899 MOD
• Extended Green Photocathode
• 1 inch diameter
• 10 stage
• Head-on Type
• Prismatic Window
• Light yield
• Cross talk

PMT (R7899)
14
summary

• The most suitable fiber for MICE scifi tracker
  will be selected by KEK studies.
• Candidates
• Standard primary(pT) 3HF(2500ppm)
• Standard primary 3HF(3500ppm)
• Standard primary 3HF(5000ppm)
• 3HF(5000ppm) only
• Attenuation length
• Aging
• Light yield
• Cross talk
• Beam test June 25th - July 2nd _at_ KEK-PS p2

15
Plans for Sci-Fi Prototyping.

• Contents-
• Mechanical Layout of Sci-Fi
• Design of the Fibre Optic Connectors
• Design Issues Still to be Addressed
• Future Plans
• This work is being undertaken by Imperial College
  and Liverpool University physics Department
  (Peter Cooke), Fermilab (Alan Bross), KEK (Koji
  Yoshimura), Osaka (Yoshi Kuno, Akira Sato)

16
Mechanical Layout of Sci-Fi

• A Reminder of the Layout of the 5 Stages

?
17
Reasons to build the Sci-Fi Prototype

• The aims of the Single stage prototype will be
  to-
• Prove the feasibility of the design
• Solve any production problems
• Try to develop more efficient (and cheaper if
  possible) construction techniques
• Ensure that all stages can be made exactly the
  same
• Test the efficiency of the light guide
  connectors
• Check the spatial repeatability of the support
  system
• To create a working detector to allow full
  system functionality
  to be developed

18
The Original Model
19
Mechanical Layout of Sci-Fi Prototype Single
Stage

• Layout

20
Mechanical Layout of Sci-Fi

• Connector Plate

21
Mechanical Layout of Sci-Fi

• Virtual Reality

22
Mechanical Layout of Sci-Fi

• Reality

23
Design of the Fibre Optic Connectors

• The fibre optic connector design is governed by
  the following factors -
• Multiplexing Layout of Sci-Fi
• Stringing feasibility of the Connectors
• Cost, ease of manufacture and delivery
• Available space

24
Design of the Fibre Optic Connectors

• The 1st Iteration
• This had 126 - 380?? holes which where so close
  that it is impossible to mould not to mention
  that they would need to have the fibres threaded
  in the correct order.

25
Design of the Fibre Optic Connectors

• The 2nd Iteration
• This has a diagonal stagger to
• maximise the distance between
• the holes (it was still not enough)
• AND STILL
• 126 separate 350? fibres
• Need to be threaded per connector!!!

26
Design of the Fibre Optic Connectors

• The 3rd Iteration
• This has a diagonal stagger to maximise the
  distance between
• the holes but more important is that it
  multiplexes at the stage.
• This means that the fibres will be threaded in
  bundles of 7 from the Fibre plane and all
  subsequent units will have 18 1mmØ fibres.

27
Layout of the connectors in the space available

• Detail of Connector Plate

28
Design of the Single Stage

• The aim, as already stated, is to have all the
  stages the same. This means that there is only
  one development programme.
• Further advantages are-
• that the amount of spares can be minimum
• All stages are interchangeable should it be
  necessary to fit a less efficient stage in a less
  critical position
• Production will be easier

29
Issues Needing to be Addressed

• Detailed design of tooling for the manufacture
  and assembly of the stages
• How to lay down the fibres to a known accuracy
• Light transmission of the connectors
• Multiplexing (is this the correct approach)
• Fixing and sealing into position

30
Future (short term) Plans

• To define and build the prototype stage whilst
  addressing the manufacturing problems
• To design and develop the tooling for the
  carbon-fibre structures
• To further develop the fibre-optic connector
• To develop assembly and installation procedures
• ???

31
Schedule
32
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

33
SciFi
Engineering representation 5 stations
a) Ribbon doublet structure
b) u-v-t fibre plan
34
Questions from Review Panel

• Fibre tracker
• 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.

35
General SW Status

• Simulation (Ed Mckigney)

feature status nominalSciFi simulation ideal SciFi simulation
5 stations ?
Electronic noise ? 0 (gt 2 p.e.) 0
Dead Channels implemented 0.25 0
Multiplexing ? 7 ? 1 none
Misalignment displacements ? rotations ? 0 0
36
General SW Status

• Electronic Noise
• Experience of VLPCs at DØ no noise above 2
  p.e.
• Cross talk
• Experience at DØ no cross talk verified by HW
  tests
• Dead channels
• Experience at DØ 77,000 channels
• 200 compromised fibre channels 0.25
• 190 compromised VLPC channels 0.25
• Alignment
• Experience at DØ 835 µm fibres
• Precision of fibre mounting 35-40 µm

37
DØ fibre tracker - VLPC performance

• (A.Bross)
• VLPC (Visible Light Photon Counter) Cryogenic
  APD _at_ 9K
• VLPC HISTE VI
• High QE 80
• Low noise lt5X104 Hz (_at_1.0 pe)
• High Rate capability
• gt40 MHz
• High production yield
• 70

38
General SW Status

• Reconstruction
• 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)
• RF background simulation
• So far used uniform distribution parallel to axis
  vary rates
• Improved model being implemented (Yagmur Torun)

39
Performance studies plans
?
Done (Ed Mckigney) Important
Lower priorty
study ideal SciFi nominal SciFi (MUX dead chn) except study params
RF bkg ?
MUX ?
Dead Channels
Misalignment
RF dead chn.
40
RF bkg studies - pt resolution
Distributions from the Berkeley meeting
41
MUX studies - pt resolution
MUX 7 ? 1 reduces pt resolution by 2
42
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

43
Test Beam

• Plan ..
• Single station prototype
• Cosmic ray test FNAL September 2003
• Determine
• Light yield at VLPC sufficient to allow noise
  rejection?
• Cross talk small?
• (Also demonstrate multiplexing and precision of
  fabrication)
• . compare results with simulation

44
Resources

• Computing
• Some access to Grid farms in IC/HEP and LeSC
• Adequate for studies to be done this summer
• Manpower
• 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)

45
Summary

• SW simulation reconstruction
• most of the functionality required is in place
• Computing resources
• adequate resources available
• Manpower resources
• losing Ed will be replaced
• but test beam commitment
• plus some extra manpower for SW Grid
• Aim to complete required SW studies by October

46

• 3) Major progress on Sci-Fi tracker !!!!!!!!!!!
• congratulations
  to the Sci-Fi team
• 1000 Sato KEK Test Results/Plans
• lab tests reducing photon MFP
  (.460 mm) x-talk
• several new fibers
  delivered for studies of MFP much more
• 2 weeks of beam tests at
  KEK later this month
• 1050 Barber SciFi Tracker Progress in Design,
  Prototype, Plans
• prototypes of support of single
  stage of 3 fiber planes
• support of connectors
  AND connectors (7 fold multiplexing built in !!!
  )
• final
  carbon fibers structure in September
• 1110 Sedgbeer SciFi Tracker Software
  Status/Plans
• SW simulation reconstruction -- most of
  the functionality required is in place
• Computing resources -- adequate resources
  available
• Manpower resources - losing Ed will be
  replaced but test beam commitment
• plus some extra manpower for SW
  Grid
• Aim to complete required SW studies by
  October

47
1130 Summers Tracker Choice Ground Rules and
Process draft set of rules defined by Don
Ghislain common technical criteria
cost and schedule
criteria Sci Fi specific criteria
TPG specific criteria To be discussed
agreed by both parties in
forthcoming phoneconference(s)
well before end of October CM
Forthcoming videoconference(s) will monitor
progress of both very closely
and frequently
48
Introduction .. and summary

• Progress towards upgrade of the downstream bug
• downstream PID taylored to 300 MeV/c m
  (200 MeV Tkin )
• based on only existing old track
  files, so never adapted to 200 MeV/c (121 MeV )
• needs some
  serious rethink (by means of new track files
  !!!)
• 1000 muons throu G4MICE. a
  MUST !!! .. volunteer needed !!!

2) Short update from TOF ( B field tests, TOF 0
max rates ) NB TOF0-TOF1 may
well be only 6 m apart (B. Palmer) 3) Major
progress on both trackers !!!!!!!!!!!!!!!!!!!!
congratulations to
both teams next CM .
end of October ..
OK
CORRAL .. 4) Rules of the shoot-out (Summers
Gregoire)