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BOS Testbeam Results in 2001. 1. Drift time spectra 2. RT-relation 3. Resolution - HV & threshold dependance -Comparison with the 1999 data 4. Summary. MPI & LMU, Munich.

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bos testbeam results in 2001

BOS Testbeam Results in 2001

1. Drift time spectra

2. RT-relation

3. Resolution

-HV & threshold

dependance

-Comparison with

the 1999 data

4. Summary

MPI & LMU, Munich

________________________________________________________________________________________

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

teststand program
Teststand & Program

3 sections scanned, 10 cm each

ML2

Chamber: BOS-0

- same chamber type as in the 1999 testbeam,

(differrent electronics!)

- runs with 2 or 4 mezzanine cards

- flowing nitrogen in ML2,

to avoid high HV currents

Threshold scan: 60 mV

77 mV

90 mV

98 mV

HV scan: 2980 V

3080 V

3180 V

Angular scans (900-1000, 1100-1300) => still to be analised…

ML1

______________________________________________________________________________________ 1

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

drift time spectra
Drift Time Spectra

2001:

60 mV threshold,

trise=(10.6±0.3) ns

1999:

25e threshold,

trise=(8.4±0.4) ns

3080 V

77 mV

60 mV

77 mV

98 mV

2980 V

3080 V

3180 V

_____________________________________________________________________________________ 2

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

fine time oscillations
Fine Time Oscillations

Channel 2

Channel 16

Fine time spectra

Fine time spectra

Uncorrected Drift Time

Uncorrected Drift Time

Corrected Drift Time

Corrected Drift Time

trise=12.8 ns

trise=11.6 ns

Excluded from the analysis!

_____________________________________________________________________________________ 3

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

maximum drift time rise time
Maximum drift time & Rise time

trise=4T0

Dt=t0-tmax

  • Dt decreases with : threshold (due to the change in t0)
  • HV (due to t0 & tmax)
  • trise degradation at higher threshols and lower HV =>
  • implies degradation in the tube resolution

______________________________________________________________________________________ 4

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

rt relation
RT-relation

residuals

1. step:

applying the rt-relation from 1999 testbeam

(determined by a silicon tracker)

and tracking through the 6 layers

(using LMU analysis software)

2. step:

Autocalibration –

correcting the rt-relation using residuals from the track,

15 bins of 1 mm

r=4.5mm

r=10.5 mm

_____________________________________________________________________________________ 5

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

tube resolution
Tube Resolution
  • Method:
  • - tracking through the 5 layers,
  • track interpolation to
  • the tube in the excluded layer
  • (excluding layers 1, 3, 4 & 6)
  • histograming the distance of the
  • real hit from the track, rextrapolated-rmeasured
  • Measured resolution:
  • smeas=s(rextrapolated-rmeasured)

Correcting for the fit error-> tube resolution:

  • sreal= sqrt (s2measured-s2corr),
  • Where s2corr=s2(m)*z2+s2(b),
  • track is given by : y=z*m+b

_____________________________________________________________________________________ 6

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

tube resolution results
Tube Resolution - Results

Preliminary!

Preliminary!

  • Similar resolution curves
  • obtained for all layers.

- Good reproducibility!

_____________________________________________________________________________________ 7

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

tube resolution threshold hv dependence
Tube Resolution – Threshold & HV dependence

Preliminary!

Preliminary!

  • degradation of the resolution with the rising threshold
  • resolution improves with higer HV (at lower radii)

_____________________________________________________________________________________ 8

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

comparison with the 1999 data
Comparison with the 1999 data

Resolution curve for the 1999 testbeam:

obtained using the same analysis

method as for 2001 testbeam data

This is compared to the

single tube resolution,

obtained by a silicon tracker =>

5-hit tracking method

gives similar results as silicon tracker

(differences for large radii)

2001 testbeam results show a

slight degradation in the resolution

with respect to the 1999 testbeam

(same chamber type and gas as in 1999)



Electronis?

Preliminary!

_____________________________________________________________________________________ 9

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

bos bil 2001 testbeam results
BOS <-> BIL2001 testbeam results

BOS

BIL

  • BOS resolution curve rises somewhat more slowly
  • similar resolution at large r

_____________________________________________________________________________________ 10

Sandra Horvat

10.12.2000, Testbeam meeting, CERN

summary
Summary

Drift time spectra :

  • low noise
  • larger rise time compared with 1999.
  • dependence on threshold & HV
  • fine time oscillations in some channels

Tube Resolution:

  • calculated by tracking through 5 layers (LMU software)
  • similar resolution for all layers, reproducible results
  • dependence on threshold & HV
  • degradation with respect to the 1999. data

(both silicon tracker and tracking through 5 layers

give similar result for 1999.)

  • BOS 2001. comparable to BIL 2001. testbeam results

Many, many special thanks to the

ROME group, for the constant

help, support & encouragement !!!

_____________________________________________________________________________________ 11

Sandra Horvat

10.12.2000, Testbeam meeting,CERN

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