A silicon disk tracker in forward direction for star
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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

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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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