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A Silicon Disk Tracker in forward direction for STAR. News since November 2000 Physics Capabilities capabilities Requirements / Potential Technologies Possible layouts Cost / Manpower / Schedule. Bellwied, June 2001. News Since November 2000. More Collaborators

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a silicon disk tracker in forward direction for star
A Silicon Disk Tracker in forward direction for STAR
  • News since November 2000
  • Physics Capabilities capabilities
  • Requirements / Potential Technologies
  • Possible layouts
  • Cost / Manpower / Schedule

Bellwied, June 2001

news since november 2000
News Since November 2000
  • More Collaborators
    • 10 people from Moscow State (a group of five hardware experts (engineers and technicians) and a group of five physicists under the leadership of G. Bashindzhagyan). The group has experience with strip detectors in D0.
  • New Physics
    • see next slide
  • New Layout
    • see next slide

Bellwied, June 2001

forward physics in star
Forward Physics in STAR
  • Charged hadron spectra (pt and rapidity) between h = 2.5-4.0 for AA and pA collisions.
  • Separate peripheral collision program
  • Important jet physics program in pp and pA.
  • V0 reconstruction
  • Better phase space for D-meson mass reconstruction through charged hadron channel

Bellwied, November 2000

ftpc new capabilities
FTPC / new capabilities
  • FTPC:
    • no PID - charged particle spectra (pt and h)
    • (+)-(-) to get proton spectra (pt and h)
    • limited v0 reconstruction through (+)(-) matching
    • momentum resolution 15-20%
  • Silicon Tracker:
    • PID through dE/dx
    • high position and momentum resolution (<5%)
    • particle identified spectra for charged hadrons and v0’s
    • potentially D-meson mass reconstruction

Bellwied, November 2000

new physics goals
New Physics Goals
  • Measurements in the baryon-dense regime
    • In central collisions the forward region will be baryon-rich (high baryochemical potential). Exotic phenomena, e.g. centauro-like events and strangelets, are preferably produced in such an environment.
    • this requires measurement of pid, momentum and Z/M ratio with silicon detectors.
    • production of light nuclei and antinuclei carries information of baryochemical potential and of production mechanism in baryon-rich region compared to baryon-poor mid-rapidity region.
    • anti-proton suppression due to increased annihilation ?

Bellwied, June 2001

new physics goals 2
New Physics Goals (2)
  • Measurements in peripheral collisions
    • study coherent collective effects on nuclei like diffractive and double-pomeron exchange.
    • study exotic meson production for soft double pomeron exchange.
    • study pomeron structure function for hard pomeron exchange with meson states in central rapidity region (requires to measure events with rapidity gap larger than two units).
    • study exotic resonance production in two photon physics for large Z nuclei.

Bellwied, June 2001

requirements technologies
Requirements / Technologies
  • Requirements:
    • excellent position resolution, good energy resolution
    • good pattern recognition
    • operate at room temperature
    • cost effective, need large coverage (> 1m2)
  • Technologies:
    • Si Pixel (too expensive ??)
    • CCD (too difficult ??)
    • Si Drift (magnetic field in wrong direction ??)
    • Si Strip (see BABAR, NLC proposal, STAR 4th layer)

Bellwied, November 2000

strawman potential layouts
Strawman / Potential layouts
  • Strawman technology = Silicon Strip
    • double-sided Silicon Strip detector, 100 micron pitch
    • 5 by 5 cm active area, 1000 channels/wafer
    • 300+320 wafers (see layout below)
    • 0.8 and 0.75 m2 of active Silicon, respectively
  • potential location:in front of FTPC
    • 5 layers (z=60,80,100,120,140 cm ; r=10,15,20,25,30 cm)
    • h = 2.3-4.0 (320,000 channels)
  • potential location: behind FTPC
    • 5 layers (z=350,375,400,425,450 cm ; r=20 cm all planes)
    • h = 3.5-5.0 (300,000 channels)

Bellwied, November 2000

potential layouts
Potential Layouts
  • two ‘stations’ in front and behind the FTPC
  • develop a quasi-circle
  • use square detectors
  • use single-sided Si
  • have FEE on disk edges
  • use TAB Technology ?

Bellwied, June 2001

tab technology
TAB technology
  • elegant solution for STAR-SSD developed by THALES

Bellwied, June 2001

ssd tab technology
SSD-TAB technology
  • SSD solution almost perfect for forward strip detector
  • FEE folds to behind the active layer, RDO on the layer edges
  • could use double-sided strip detector, ALICE frontend chip, hybrids, bus cables, multiplexer, and ADC boards
  • readout pitch too fine (only readout every 2nd strip ? = 190 micron pitch)

Bellwied, June 2001

modifications to the layout
Modifications to the Layout
  • Use single sided strip detectors
    • During the silicon Detector Quality Assurance Workshop (May 17/18) most experts agreed that double-sided detectors should only be used if absolutely needed (due to radiation length constraints). Otherwise two single-sided detectors, coupled back to back are a much more simple, cheap and reliable solution.
  • Reduce number of readout channels
    • charge division method (as used by ZEUS) can achieve 10 micron resolution with 120 micron pitch by using five intermediate passive strips.
  • Reduce number of strips ?
    • only perpendicular strips if occupancy is low.

Bellwied, June 2001

f and h coverage
F and h Coverage

Bellwied, June 2001

pt coverage from ftpc
pt coverage (from FTPC)

Bellwied, June 2001

occupancy
Occupancy
  • we assume around 1000 charged particles in h=2.5-4
  • first layer before FTPC= 16% occupancy
  • last layer before FTPC = 1.4% occupancy
  • we could vary pitch for different layers
  • occupancy not perfectly homogenuous, but close (see FTPC figure)

Bellwied, June 2001

instrumentation involvement
Instrumentation Involvement
  • Detector Development
    • mask layout for double-sided detector with stereo angle
    • prototype production of wafers
  • Electronics Development
    • low noise multi-channel FEE
    • hybrid readout chip
  • Detector assembly
    • bonding (potentially TAB bonding)
    • detector assembly

Bellwied, November 2000

cost manpower schedule
Cost / Manpower / Schedule
  • Cost Estimate
    • around $ 4 Million for coverage in front and behind the FTPC (based on 4th layer and NLC cost estimates)
  • Manpower
    • need a crew about the size of the SVT project
    • same level of Instrumentation involvement
  • Schedule
    • the earlier the better
    • if proven technology is used we should be able to install by 2004

Bellwied, November 2000

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