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Si VTX Workshop 2003.08.12. Y. Akiba. Agenda and goals. Goal A PAC Proposal 9:00 - 9:30 Physics with vtx, PAC+DOE proposal overviews, what needs to go in, when due: Yasuyuki 9:30 - 9:50 Status of Simulations, Vladimir 9:50 - 10:10 Rate Assumptions to use: Tony F

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Si vtx workshop 2003 08 12

Si VTX Workshop2003.08.12

Y. Akiba

Agenda and goals
Agenda and goals

  • Goal A PAC Proposal

  • 9:00 - 9:30 Physics with vtx, PAC+DOE proposal overviews, what

    needs to go in, when due: Yasuyuki

  • 9:30 - 9:50 Status of Simulations, Vladimir

  • 9:50 - 10:10 Rate Assumptions to use: Tony F

  • 10:10 - 10:25 D=>Kpi update: Craig:

  • 10:25 - 10:40 coffee

  • 10:40 - 10:55 open flavor via semi-leptonic decay, what needs to be

    done for the proposal+by whom, all

  • 10:55 - 11:10 gamma+jet, what needs to be done for the proposal+by

    whom, all

  • 11:10 - 11:40 x-range update for different channels, barrel,endcap+barrel: Pat

  • Goal B: DOE proposal

  • 11:40 - 12:00 Discussion of proposal scope: endcap+barrel, or barrel then endcap later: all

  • 12:00 - 12:30 R&D fund proposal for allocation: Craig


  • Recent news on Proposal (from Axel)

    • The September PAC (9/29 – 9/30) will not discuss upgrade proposal (as Axel hear it from Tom Kirk 1 week ago. This is new)

    • DAC (Detector Advisory Committee) will probably become a sub-panel of PAC. It is possible that there will be a meeting by DAC (or Upgrade sub-panel of PAC) in Oct/Nov period

    • Exact formalism/mechanism how the proposal is presented is unclear at this moment.

    • We still aims for producing proposal by end of August/beginning of September

      • Necessary to get DOE funding from the US FY05

      • Focus on physics (this is physics proposal)

      • Possible “optimization” of the Strawman model, but this can be done later in proposal  CDR period

      • Cost and schedule need to be shown (to DOE)

Questions to loi to be addressed
Questions to LOI to be addressed

  • X range coverage plot

    • Physics significance (DAC,Tony F, MJL)

    • Expected statistical error (Abbay)

    • Theory comparison for shadowing (MJL)

  • Jet angle resolution (DAC, MJT)

  • Realistic rate estimate (DAC, Tony, MJT)

    • Should include realistic uptime, efficiency, etc (DAC/Tony/MJT)

    • Ldt should be shown each of performance plot (Tony)

    • Rate estimate for barrel and end-cap should be consistent (Tony)

  • Trigger

    • CDF like vertex trigger (MJT)

    • LVL3 trigger (Tony)

  • Impact on electron measurement (DAC, Tony, MJT)

    • Impacts

      • Trigger

      • Existing central arm

      • HBD upgrade

    • Full simulation + reconstruction should be presented (DAC, Tony, MJT)

    • Mechanics option: can you remove barrel? (DAC, Tony)

    • Barrel/end-cap interface is too close to Z=0 (MJT)

Partial/qualitative answer

Should be given in proposal

Physics issue to be addressed in Proposal

Technical issue that can be addressed in Proposal

Issues that we can not be fully answered in proposal

More questions to be considered
More questions to be considered

  • Strawman model and optimization

    • Is the barrel geometry optimal?

      • 2 layer or 3 layers of strips

      • Radius of the strip layers

      • Z-coverage of the barrel

    • Is the barrel/end-cap interface at optimal position?

    • Is the end-cap geometry optimal

      • Do we need 4 layers?

      • Can the pixel layer be used as the first layer for end-cap?

  • Full simulation on the end-cap and muon arm

    • How well the muon track can be connected to endcap tracks

  • Effect of finite beam spot size

    • Beam size is larger than DAC

      Full simulation is required to fully address those questions.

      Some answers should be given in the proposal

Possible modified strawman barrel
Possible modified strawman (barrel)


Strip 1 R=14 cm

Strip 1 R=10 cm

Pixel R=2.5cm

beam pipe


  • DAC resolution is determined by pixel (unchanged)

  • Large R for strip can be better

    • For connecting to central arms

    • Momentum resoultion for self tracking (in pp or pA or light ion)

  • Less material  reduced mult scattering and conversion

  • Pixel ladder 2×3×3 chips (±13.5mm) or longer

    • cost?

    • Rad length? (but thicker rad length in large Z only may not be a problem

    • Pixel layer can be the first layer of end-cap

  • Somewhat longer strips (about ± 20 cm) to move “interface” away from Z=0

Contents of proposal
Contents of proposal

  • Physics case (Main part)

    • Physics case for

      • b/c measurement in AA/pA/pp

      • Gamma-jet measurement in pp/pA

    • Realistic rate estimate for *ALL* figures and tables

      • Estimated statistical errors for physics quantities

      • Comparison with theory curves

      • Consistent with 5 year EBUP, the decadal plan, and the existing measurement and rate

      • Consistent in barrel and end-cap

      • Effect of finite beam spot size

      • Effect of jet angular resolution

    • Impacts on existing PHENIX and upgrade

      • Some answer to the questions to be given. (Full answer waits for full simulation)

  • Implementation

    • Strawman model

      • Based on LOI strawman

      • Possible optimization in barrel/endcap geometry

    • Technology choices

      • Alternative technology options should be mentioned

  • Management issues (mainly to DOE)

    • Management structure

    • Responsibilities

  • Schedule and Costs

    • Target year for (partial) installation (RUN7, RUN8,…)

    • Barrel+Endcap or Barrel first + Endcap later

Si vtx workshop 2003 08 12

Project Manager

Deputy Project Manager



End caps

Ancillary Systems

And integration




Pixel layer

Strips layers


Sensor readout hybrids

Mechanical Support

Data Collection Modules


Readout Card

Detector ladders


Slow Control

Offline Analysis

Front End Module

Ladder Readout Module


Online Monitoring

Front End Module

System Integration

Draft organization chart (by Axel Drees)

Possible time time
Possible Time time

















Read-out chips




Construction (barrel)


Support, etc











Work need to be done for proposal
Work need to be done for Proposal

  • Realistic and consistent rate estimate of *ALL* physics performance figures

    • Use Tony’s rate estimate as guide line

  • Some estimate of impact of finite beam spot size

    • For Au+Au --- it is easy. We can reconstruct collision vertex.

    • For p+p  Need some PYTHIA study to estimate vertex reconstruction efficiency

  • Some estimate for jet angular resolution

    • Need PYTHIA study

  • Estimate for impact on electron measurement

    • We require that an electron track is confirmed by inner-most pixel layer. Thus conversion in 2nd – 4th layer does not contribute if the tracking is perfect.

      • This logic fails if the conversions are accidentally confirmed by the pixel layer due to high occupancy.

      • This “accidental” confirmation probability can be estimated from occupancy and resolution of DC track – SVT projection.

      • Penalty (efficiency loss) due to track confirmation can also be estimated

  • Estimate of the impact to electron trigger

    • Already, S. Lebedev made study from the converter run

  • Estimate of track-SVTX matching for the barrel and the end-cap in Au+Au

    • This can be estimated from angular resolution and occupancy of tracks

      (We should assume that event vertex is precisely reconstructed in Au+Au)

  • More…

After proposal
After proposal

  • Proposal is only one step for starting the project

  • Next steps are

    • DAC(?) presentation

    • Internal PHENIX approval

    • CD0 (in DOE side)

    • CDR

  • What is needed from Proposal to CDR

    • Full simulation of the proposed detector

    • Realistic evaluation of the impact to PHENIX

    • Optimization of the proposed detector

    • More realistic estimate of the rate, strengthen physics cases

    • Most of the Technology choices should be made by CDR

Questions comments to loi
Questions/comments to LOI

  • DAC summary

    • Jet angle resolution. How does it work. Mom resolution of VTX track.

    • Better x range coverage plot.

    • More detailed rate. Should be consistent with RHIC 5 year projection

    • Comprehensive simulation and reconstruction

    • Impact from conversion to (i) existing system (ii) HBD (iii) lvl1 e-trigger

    • Mechanical design (remove barrel and leave end-cap)

  • Tony Frawley

    • Significance from x-range increase is unclear.

    • What is the required luminosity (x40 needed?)

    • Consequence of 4-8% radiation length of SVX to e-trigger.

    • Consistency between C-arm and Mu-arm rate of BJ/PSI

    • Remove barrel, leave end-cap option

    • Ldt needed for each of the performance plot.

    • Need realistic luminosity and efficiency should be included in rate estimate. (RHIC uptime, PHENIX uptime, vertex cuts, reco efficiency, etc)

Questions comments to loi1
Questions/comments to LOI

  • Mike Leitch

    • Clearer physics case.

    • Emphasize that charm measurement become more robust even for “existing” x-range.

    • In p+A shadowing plot --- present theory curve (Eskola).

    • Muon J/PSI mass will be improved(?)

  • Abbay

    • Show projected statistical errors on the x-range plot.

  • MJT

    • Rad length of SVT is a concern. (trigger and reco)

      • Need full simulation

      • Use thick converter run to measure the effect

    • CDF like vertex trigger should be included

    • Need realistic MC of jet measurement by SVT

    • Realistic rate estimate based on realitic assumption needed

    • Barrel is too small. Also, the transition between barrel to endcap can cause too much background.