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Ｇａｉｎ　Ｍｏｎｉｔｏｒｉｎｇ　Ｓｙｓｔｅｍ

Gain monitoring system for analyzing fiber distribution, LED direction impact, ADC distribution with and without LED, and the effectiveness of tracing paper. Optimize signal-to-noise ratios and determine the number of CMBs efficiently.

jonah-henson
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Ｇａｉｎ　Ｍｏｎｉｔｏｒｉｎｇ　Ｓｙｓｔｅｍ

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  1. Ｇａｉｎ　Ｍｏｎｉｔｏｒｉｎｇ　ＳｙｓｔｅｍＧａｉｎ　Ｍｏｎｉｔｏｒｉｎｇ　Ｓｙｓｔｅｍ 28th Feb. 2008 KOBE Hiroko Ikeda

  2. Status • 0.8mm thick, 10mm width, and flat acrylic plate is considered to be the best. • Fiber distribution has been done. • Now trying the system with two layers (twin, as follows) With only 1 layer Acrylic plate (27.0cm long) LED Acrylic plate（15cmlength) Acrylic plate（15cmlength) Acrylic plate（15cmlength) Acryl Frame Acrylic plate（15cmlength) Acryl Frame ＬＥＤ Acryl Frame ＬＥＤ Acryl Frame Scintillator strip (1 x 4.5 x 0.3 cm) ＬＥＤ WLSF Scintillator strip (1 x 4.5 x 0.3 cm) WLSF Scintillator strip (1 x 4.5 x 0.3 cm) WLSF Scintillator strip (1 x 4.5 x 0.3 cm) WLSF

  3. Fiber Distribution LED direction toward each fiber varies. Clear fiber There are 20 fibers per a bundle. Amount of LED light greatly depends on the direction. Vbias:77.0V LED width:20ns Compared Np.e. of the ‘closest’ fiber to the light axis with one of the ‘farthest’. ●:nearest ●:farthest ●:closest ●:farthest 12.12% 6.318% ADC distribution of the ‘closest’ ADC distribution of the ‘farthest’

  4. Double Distance (No fiber) 2 layers adjoin 2.853% Black: Noise (w/o LED) Red: w/ LED Np.e. can be calibrated.

  5. Double Distance (with fiber) Closest Farthest ●:Farthest ●:Closest ●:w/o fiber 40.68% 24.04% 35.25%

  6. Tracing Paper • In order to reduce the dispersion due to the LED direction, pinched the tracing paper between LED and fiber. 2 Tracing paper (40g/m ) ●:farthest, w/o tracing paper 35.25% ■:farthest, w/ tracing paper 57.66% ▲:closest, w/o tracing paper 38.50% ▼:farthest, w/ tracing paper 41.43%

  7. Summary & Plans • Np.e. depends on which fiber we use. • Np.e. of the scintilator far from the LED is very small. (About half of the signal is dark noise. ) • There isn’t a significant difference between direct and fiber in the latter 9cm. • Tracing paper isn’t effective. Need something thicker. • Determine the number of CMB by this weekend.

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