Setup of Gain Monitoring System with Mr. Uozumi

1
Setup of Gain Monitoring Systemwith Mr. Uozumi

• Kobe Univ.
• Hiroko Ikeda
• 18,May 2007

2
STATUS

• Mr.Uozumi brought 3flat cables (with MPPCs),
• a circuit for readout, a LED driver, and LEDs
• (high-functional, and UV).
• The LED driver, and one of the flat cables had
• been broken.

3
STATUS

• Signal from flat cable is integrated by ADC,
• and number of photons enter each strip is
• calculated.

4
ADC
PC
MPPCs (1600 pixels)
AMP
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.
Acryl Frame
Scintillator strip (1 x 4.5 x 0.3 cm)
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EFFORT?

• At first, there was only one hole on the
  reflective
• material.
• Signal was very small, so, in order to observe
• larger one, cut holes on the center of each
  strip.

Small change observed.
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EFFORT?

• Signal was still small.
• To see much larger signal, make one of holes
• bigger roughly, and other 2 holes a single one.

Obvious change observed. Measurement is ongoing
in this circumstance now.
7
RESULTS

• Size and position of hole
• Distance from LED
• At least 5 photons reach each strip now.

effect on amount of light
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OUTLOOK

• Make much more stable structure to get
  recreativity.
• Use multi channel amp .
• Study and compare about material and
  characteristic of
• acrylic plate.
• Examine which effects more on amount of light
  size or
• distance of holes
• ?if size, need to consider effect of cross-talk
• Reduce LED noise.