Linear Collider TPC R

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LC-TPC RD(Goals, Status, Plans)
LONG VERSION
Ron Settles DESY/MPI-Munich
ACFA LINEAR COLLIDER WS_at_Mumbai 15-17 Dec. 2003
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LC TPC RD Groups (1)

• DESY-Physics-Review-Committee Groups
• Aachen
• Berkeley LBNL
• Carleton/Montreal/Victoria
• DESY/Hamburg
• Karlsruhe
• Cracow
• MIT
• MPI-Munich
• NIKHEF
• Novosibirsk
• Orsay/Saclay
• Rostock
• St. Petersburg

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LC TPC RD Groups (2)

• Other USA groups
• BNL
• Chicago/Perdue/3M
• Chicago/Perdue
• Cornell (UCLC)
• MIT (LCRD)
• Temple/Wayne State (UCLC)
• Yale
• Asia
• Interest expressed

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Goal

• To design and build an ultra-high performance
• Time Projection Chamber
• as central tracker for the LC detector
• where excellent vertex, momentum and
• jet energy precision are wanted

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HISTORY A DECADE OF TRACKING STUDIES 1992 First
discussions on detectors in Garmisch-Partenkirsche
n (LC92). Silicon? Gas? 1996-1997 TESLA
Conceptual Design Report. Large wire TPC,
0.7Mchan. 2000 TESLA Technical Design Report.
Micropattern (GEM, Micromegas) as a baseline,
1.5Mchan. 5/2001 Kick-off of detector
RD 11/2001 DESY PRC for the TPC (includes
north-American teams)

• Recommendations of 52nd Meeting of the DESY PRC
  25-26 October 2001

PRC RD-01/03 LC TPC RD The PRC
recommends the approval of the proposed RD
programme. It encourages the collaboration to
perform in high magnetic-field tests of the
different end-plate technologies (GEM, MICROMEGAS
and standard wire chambers).

• Status Report given at DESY PRC meeting 07 May
  2003

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-5
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• High granularity to ensure robust operation in
  presence of large backgrounds
• Continuous tracking to ensure good
  momentum-measuring precision and gt98
  pattern-recognition efficiency in jets

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North American Large TPC detector simulations
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General Happenings

• PRC steering committee to take care of
  workshop/
• conference talks, phone/video meetings,
  contact with other
• labs, etc.
• Video, VRVS and/or phone TPC RD meetings about
  every
• couple of monthss
• Task-sharing among groups is picking up, e.g.
• --LBNL providing Star electronics for
  Canadian, French, German labs
• --MPI providing Aleph electronics
• --Desy 5T magnet to be used by 5
  Canadian and German groups
• --Saclay 2T magnet to be used by
  North American and French groups
• --MicroMEGAS work by Canadian,
  French and US groups
• --GEM progects by Canadian, German,
  Russian and US groups
• --Fieldcage studies started in
  Russia and Germany
• --Electronics work in Canada,
  Germany, Holland

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GEM and Micromegas
GEM Two copper perforated foils separated by an
insulator The multiplication takes place in the
holes. Usually used in 2 or 3 stages
Micromegas a micromesh sustained by 50-100 mm -
high insulating pillars. The multiplication
takes place between the anode and the mesh One
stage

• Very

200 mm
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GEM and Micromegas
S1/S2 Eamplif / Edrift
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SOME GOALS OF THE STUDY Assess the new
technologies Choose gas alternatives Understand
the electron transparency, extraction efficiency,
ion feedback Check that micropattern detectors
keep their good properties in a magnetic field
and are robust in high backgrounds Study dE/dx
resolution Obtain optimal position
resolution Start designcontact industry for
detector manufacturing (thinner frames, grids) Or
improve the wire chamber technology Orsay
Small-gap, asymmetric wire chamber Munich
wire/Gem/Micromegas chamber for
measurements in 5T Desy magnet
wt gt20 -gt potential transverse diffusion
less than 200 mm at 1m
e.g., ArCF4
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Examples of activities

• (see talks at Montpellier website or
• alephwww.mppmu.mpg.de/settles/tracking/montpellie
  rtalks.html
• for more details on latest happenings)

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DESY/Hamburg large Gem prototype (B0)
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DESY/Hamburg Gem prototype for B5T magnet
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DESY/Hamburg, other activities

• TDC-based readout electronics for LC TPC
• Current measurements with small Gem TPC
  prototype B field, Gem parameters, study CERN
  vs. Russian (Nijni Novgorod) Gems
• Improved DAQ system
• Providing 5T facility for other groups

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Aachen

• Measurement of cluster width in magnetic field
• Measurement in large TPC with Gem readout
• Simulation of Gem readout
• Simulation of field cage
• Minimization of ion feedback in triple Gem
  structure
• using simulation, fit to data and then
  experimental
• verification

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Aachen
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Aachen
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Aachen
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Aachen
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Aachen
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Aachen
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Aachen
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Saclay/Orsay, LBNL, Carleton, Victoria

• Micromegas
• Gas studies many measurements ? CF4 feasible
• Ion-feedback studies
• Measurements started in the 2T magnet
• Charge-spreading using resistive anode

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Saclay/Orsay

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Saclay/Orsay

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Saclay/Orsay, LBNL, Victoria

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Saclay/Orsay, LBNL, Carleton, Victoria

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Saclay/Orsay, LBNL, Carleton

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Saclay/Orsay, LBNL, Carleton

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IPN Orsay Joel Pouthas, Philippe Rosier,
Vincent Lepeltier

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IPN Orsay Joel Pouthas, Philippe Rosier,
Vincent Lepeltier

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Karlsruhe/CERN

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Karlsruhe/CERN

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NIKHEF MediPix 2 pixel (Jan Visschers et al)

Cathode foil
Drift Space
GEM foils
base plate
MediPix 2
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Carleton/Victoria/Montreal

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Carleton/Victoria/Montreal

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Victoria A Newly Operational GEM TPC
Designed for B Field Tests

• 30 cm drift, 22 cm O.D. , 256 readout pads (60 mm
  ? 10 mm)
• Signals read out with STAR electronics
• Plans for magnetic field tests 1 T at TRIUMF 5T
  at DESY
• Also lots of simulation-work on measuring prec.
  w/ MPGDs

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Victoria/Carleton/Mpntreal tests at Triumpf

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Victoria/Carleton/Montreal tests at Triumpf

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Victoria tests at Desy 5T magnet

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MPI-Munich prototype for Wires, Gem or Micromegas
test in 5T magnet(wire version ready)
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MPI-Munich TPC prototype for 5T magnet at Desy
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MPI-Munich TPC prototype for 5T magnet at Desy
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Other activities

• Lorentz-angle meas., Gas studies,
• Gem resolution/manufacturing at
• MIT
• Gas studies at
• Cracow
• Work on TPC field cage starting at
• Desy (prototyping)
• Aachen (simulations)
• St. Petersburg (field simulations)

A. Krivchitch
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TPC-related work outside our collaboration

• -- BNL
• -- Chicago/Perdue/3M
• -- Chicago/Perdue
• -- Cornell (UCLC)
• -- MIT (LCRD)
• -- Temple/Wayne State (UCLC)
• -- Yale
• ? see Madhu Dixits NA Gaseous-Tracking talk at
  our world LC tracking meeting at the Amsterdam
  Ecfa/Desy workshop http//alephwww.mppmu.mpg.de/
  settles/tracking/amsterdamtracking/talkswelcome.ht
  ml
• -- Asia
• ? see Norair Khlatyans Asian Gaseous-Tracking
  talk at same meeting

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Overview American activities ? see Madhu Dixits
NA Gaseous-Tracking talk at world LC tracking
meeting at Amsterdam Ecfa/Desy workshop
alephwww.mppmu.mpg.de/settles/tracking/amsterdamt
racking/talkswelcome.html

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Cornell

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Cornell

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Cornell/Purdue

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Chicago/Purdue/3M

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Wayne State/Temple

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Phenix/Star

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Phenix/Star Gem TPC RD

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Phenix TPC upgrade plans

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BNL/Yale triple Gem measurement

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TPC milestone-