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Gain Monitoring System Hiroko Ikeda (Kobe Univ.) 6,Aug. 2007 Gakujutusouseikaigi@KEK
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Gain Monitoring System

Jan 20, 2016

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Hiroko Ikeda (Kobe Univ.) 6,Aug. 2007 Gakujutusouseikaigi@KEK. Gain Monitoring System. Motivation. To monitor the gain by watching 1 p.e. peak position at BT. LED light has to be distributed to all the strips. LEDs will be controlled by CMB (Calibration Monitoring Board). - PowerPoint PPT Presentation
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Page 1: Gain Monitoring System

Gain Monitoring System

Hiroko Ikeda (Kobe Univ.)

6,Aug. 2007

Gakujutusouseikaigi@KEK

Page 2: Gain Monitoring System

Motivation• To monitor the gain by watching 1 p.e. peak

position at BT.

• LED light has to be distributed to all the strips.

• LEDs will be controlled by CMB (Calibration Monitoring Board).

• One CMB can deal with 12 LEDs.

Page 3: Gain Monitoring System

MPPCs(1600 pixels)

Acryl Frame

Scintillator strip(1 x 4.5 x 0.3 cm)

To trigger reflection, put reflective material on strips.

Then, set the acrylic plate covered by the same material on it.

And, shade all from light with black sheet.

ADC

AMP

PC

WLSF

Page 4: Gain Monitoring System

Status・ Signal from flat cable is integrated by ADC,

and number of photons which enter each MPPC is calculated and shown as histograms.

Page 5: Gain Monitoring System

Measurement1• Signal was so small, cut 2mm diameter holes in

reflector sheet on each strip to get bigger signal.

greatly improved but still small

Page 6: Gain Monitoring System

Result11ch 2ch 3ch

4ch 5ch 6ch

9ch8ch7ch

Number of p.e. is calculated as:

20℃

77V

Np.e. = Mean ー ped

d

Page 7: Gain Monitoring System

Measurement2• To increase amount of light, cut tiny hollows on

acrylic plate.

• Due to these holes, reflections thought to occur frequently.

Page 8: Gain Monitoring System

Comparison

▲ : with hollows

● : w/o hollows

Page 9: Gain Monitoring System

Summary• Gain monitoring system in Kobe is running

well.

• Correlation between the distance and amount of light has observed.

• Hollows on acrylic plate increase the amount of light.

Page 10: Gain Monitoring System

Plans• Measure all the channels simultaneously.

• For the BT, much thinner plates and many more photons are needed.

• Try acrylic plate with hollows (all the hollows are exactly the same).