Beam test of Silicon-Tungsten Calorimeter
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Beam test of Silicon-Tungsten Calorimeter Prototype. 7 th ACFA workshop, Taipei 2004/11/10 Youngdo Oh (Kyungpook National University).

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Beam test of Silicon-Tungsten Calorimeter Prototype

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Beam test of silicon tungsten calorimeter prototype

Beam test of Silicon-Tungsten Calorimeter Prototype

7th ACFA workshop, Taipei2004/11/10

Youngdo Oh (Kyungpook National University)

On behalf ofEwha womans University: S.J. Baek, H.J. Hyun, A.L. Jeong, S.W. Nam, I.H. Park, J. Yang Korea University: J.S. Kang, S.K. Park, J.H. ChoiKyungpook National University: Y.D. Oh, K.H. Han, D.H. Kim, J.S. Seo, U.C. YangSeoul City University: I.K. ParkSungkyunkwan University: I.T. Yu, Y.P. YuYonsei University: B.S. Jang, S.H. Jeong, J.H. Kang, Y.J. Kwon


Beam test of silicon tungsten calorimeter prototype

Beam test Condition

Beam Test : Aug. 30 – Sep. 7 2004

SPS : 400GeV proton beam

Beam interaction with a target (T2)

Beam cycle length 18.0 sec.

4.8 sec spill length

User controls test beam particle type,

energy(10,20,30,50,80,100,150 GeV),

focus, and the intensity

Test beam energy accuracy +/- 0.3%

Beam particle purity > 95%


Beam test of silicon tungsten calorimeter prototype

Tungsten and mechanics

Tungsten size : 65.5 mm X 57.5 mm ( ~ sensor size)

purity : close to 99% ( Rm = 9mm)

thick : 3.5 mm (= 1 X0)


Beam test of silicon tungsten calorimeter prototype

Sensor and analog electronics

The heritage from space experiment

1mm inactive gap between sensors

Silicon Sensor

32 pixels

in a layer

131mm X 115mm

Analog Board

Aluminum 1.5mm

pcb structure 10 mm

Tungsten 3.5 mm

Aluminum 1.5 mm

15 mm

Rt= a layer / tungsten = 15.0/3.5 = 4.8

(CALICE ~ 2)

Eff. Rm = 9mm * (1 + Rt) = 52mm

Total 20 layers = 20 X0, 30cm thick

19 layers of shower sampling


Beam test of silicon tungsten calorimeter prototype

Assembly & Mechanic support

Tungsten 1X = 35mm

Rt= a layer / tungsten = 150/35 = 4.8

(CALICE ~ 2)

Total 20 layers = 20X

(a CALICE prototype.: 30 layers 30X)


Beam test of silicon tungsten calorimeter prototype

Assembly


Beam test of silicon tungsten calorimeter prototype

Beam Test Activity

1. Tunning time delay

2. Detector Alignment run

3. MIP calibration of all channels

(no tungsten)

4. Data Run (20 layers)

(electron 150,100,80

50,30,20,10 GeV

hadron 150 GeV

muon 150 GeV)

5. Data Run (10 layers)

: to study transverse shower

profile

beam


Beam test of silicon tungsten calorimeter prototype

Monitoring data & alignment

Detector alignment

Data monitor : online, offline


Beam test of silicon tungsten calorimeter prototype

Data Summary (50GB)

Beam

Beam Energy (GeV)

files

Etc

4x4x20

Muon

150

23

TD Check

Electron

50

33

TD Check

Pion

150

35

Sensor scan

4x4x20

Tungsten

Pion

150

12

Muon

150

42

Electron

150,100, 80,50, 30 ,20 ,10

399/37~89

3

4x8x10

Tungsten

Pion

150

Muon

150

18

Electron

150, 100, 50, 20

162/36~48


Beam test of silicon tungsten calorimeter prototype

Channel Scan for MIP calibration

  • Channel summary

  • noisy(~10%)

  • ADC unstable(~5%)

  • deal channels (~5%)

One panel of sensor shown as an example


Beam test of silicon tungsten calorimeter prototype

Gain Calibration of Individual Channels

  • 150 GeV Muon Beam

  • Scan over All 640 Channels

  • Size of signal from the pedestal level of a channel is used to calibrate the channel

  • S/N (signal to noise rate) = 5.2

    (5243 -5207)/7.2

Pedestal :

Gaussian Fit

Mean : 5206.9

Sigma : 7.2

Signal :

Landau Fit

Peak : 5243

ADC Counts


Beam test of silicon tungsten calorimeter prototype

Detector Response to Different Particles

First look of data

Just sum of all channels

Including noisy, bad and dead

channels

Not optimized detector

No calibration

No beam position information

considered

50 GeV Electron

50 GeV pion

150 GeV Muon

Total ADC of an event / 640


Beam test of silicon tungsten calorimeter prototype

Detector Response to Electron Beam(sum of all channel)

First look of data

150 GeV Electron

100 GeV Electron

80 GeV Electron

50 GeV Electron

30 GeV Electron

20 GeV Electron

10 GeV Electron

Total ADC of an event / 640


Beam test of silicon tungsten calorimeter prototype

Calorimeter Calibration : ADC vs. Beam Energy

First look of data

Very preliminary

Total ADC above pedestal / 640

Fit to Straight Line

-> Slope 4.2 (ADC/GeV)

Electron Energy in GeV


Beam test of silicon tungsten calorimeter prototype

Energy Resolution vs Energy

First look of data

Very preliminary

dE / E (%)

Electron Energy in GeV


Beam test of silicon tungsten calorimeter prototype

Summary

  • 1. Beam test of Silicon-Tungsten during Aug. 30 to Sep. 7 at CERN

  • 2. ~50GB data collected using electron, muon and pion beam

  • 3. Analysis is under way

  • : noisy, unstable, dead channel. leakage due to large effective RM (52mm)

  • not optimized electronics and detector for LC calorimeter

  • 4. Require detailed MC study for the accurate geometry

  • 5. Si/W Detector is working .

  • The result will be presented in next LCWS.

  • 6. In Korea, R&D for LC calorimeter is going on.

  • This beam test experience will give positive idea for R&D activity.


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