A silicon disk tracker in forward direction for star
1 / 17

A Silicon Disk Tracker in forward direction for STAR - PowerPoint PPT Presentation

  • Uploaded on

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

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'A Silicon Disk Tracker in forward direction for STAR' - anevay

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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 direction for STAR

  • 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 direction for 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 direction for STAR

  • 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 direction for STAR

  • 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) direction for STAR

  • 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 direction for STAR

  • 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 direction for STAR

  • 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 direction for STAR

  • 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 direction for STAR

  • elegant solution for STAR-SSD developed by THALES

Bellwied, June 2001

Ssd tab technology
SSD-TAB technology direction for STAR

  • 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 direction for STAR

  • 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 direction for STAR and h Coverage

Bellwied, June 2001

Pt coverage from ftpc
pt coverage (from FTPC) direction for STAR

Bellwied, June 2001

Occupancy direction for STAR

  • 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 direction for STARInvolvement

  • 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 direction for STAR

  • 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