Impact parameter resolution study for ilc detector
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Impact parameter resolution study for ILC detector. Tomoaki Fujikawa (Tohoku university) ACFA Workshop in Taipei Nov. 11 2004. Outline. Study the pair e + e - background hit rate for vertex detector with various B fields. (tool:CAIN,Jupiter).

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Impact parameter resolution study for ilc detector

Impact parameter resolution study for ILC detector

Tomoaki Fujikawa (Tohoku university)

ACFA Workshop in Taipei

Nov. 11 2004


Outline

Study the pair e+e-background hit rate for vertex detector with various B fields. (tool:CAIN,Jupiter)

Optimize the vertex detector radii for each B field.

Obtain the impact parameter resolutions with optimized radii. (tool:TRACKERR)


Pair background hit rate study

Simulation tools

  • CAIN

(for e+e- pair background (dominant) generation)

Monte-Carlo program for the beam-beam interaction. (by Yokoya-san)

Included interactions are…

・Jupiter

(for pair background hit rate estimation)

JLC Uniform Particle Interaction and Tracking EmulatoR. GEANT4 based full simulator for ILC (under construction…)


Beam parameters (input parameters for CAIN)

Beam parameters are similar to those in the TESLA TDR.

crossing angle = 7mrad.


Detector configuration (for the Jupiter)

Detector is constructed with the Beam pipe, Vertex detector (Ladder construction), Intermediate tracker, Mask, etc. and base geometry is “Old” one. (Namely, designed for “Warm” machine.)


The configuration of the vertex detector

These conditions are applied to estimate pair background hit rate as first layer radius is varied.


Pair background hit rate for the vertex detector

1.hit point uniformity (for 1st. layer)

B = 3tesla, R1 = 1.2cm.

Z vs. phi

Z

We can use the average hit rate to estimate the occupancy.


2. Number of fired pixels per track hit (for 1st. layer)

Number of fired pixels per 1 track passage is about 3.7. (independent of radius and B field)

Number of fired pixel per track hit


3. Determination of first layer radius

  • 20 readouts per train

  • 3.7 fired pixels per track hit

  • Pixel occupancy(%) = hit rate (/bunch/cm2) 0.326

  • Set the first layer radius such that its pixel occupancy = 0.5%


First layer hit rate vs. first layer radius

3 tesla

4 tesla

5 tesla

fit function:

0.5 % occupancy occurs at


Impact parameter resolutions

Use TRACKERR program (also momentum resolution).

Assume pions.

TRACKERR:

FORTRAN program to calculate tracking error matrix with using cylindrically symmetric system.

Energy loss, energy loss fluctuation and multiple scattering effects are included. Track fitting uses Kalman filter.


Detector configurations for TRACKERR

3 tesla

4 tesla

5 tesla

Beam pipe (Be)

VTX detector (Si pixel)

IT (Si strip)

TPC


Impact parameter resolutions of the r-phi plane

Impact parameter resolutions are mostly the same for each magnetic field case. (true for other configurations with different thickness for BP and VTX detector.)


Other configuration results are as follows (at polar angle = 90 deg.):

For P = 1GeV/c 3tesla is worse than 4(5) tesla by 12.0(19.2) %.

For P = 10GeV/c 3tesla is worse than 4(5) tesla by 6.4(8.8) %.


Momentum resolutions 90 deg.):

Momentum resolution is better for high B at low P, and better for low B at high P.


Other configuration results are as follows (at polar angle = 90 deg.):

Momentum resolution is better for high B at low P, and better for low B at high P.


Comparison with other detector configurations 90 deg.):

1. TESLA detector:




2.New VTX detector configuration (proposed by Sugimoto-san): 90 deg.):

Polystyrene foam

VTX detector

Layer




Other configuration results: 90 deg.):

Momentum resolutions are mostly the same as single layer case, but impact parameter resolutions are different. (single layer case does not have support design yet.)


Summary and Plan 90 deg.):

Summary

  • Impact parameter resolution and momentum resolution are mostly the same in each B field case. (More detailed study (namely, b- and c-taging efficiency study) is needed to estimate the best B field.)

  • Thickness of the detector components are quite important to obtain the good impact parameter resolution.

Plan

Estimate the impact parameter resolutions (and more) by using a full simulator. (To do so, development of the simulator is necessary…)


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