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Progress Report on the Proposed Monitoring System for EMCalorimeter

Progress Report on the Proposed Monitoring System for EMCalorimeter. TV Meeting June 15, 2006 Niigata University/MSU-IIT Anthony Paul D. Ramirez, Hiroaki Ono, Prof. Hitoshi Miyata. Proposed Monitoring System for EMCalorimeter. possible location of clear fibers. Clear fiber.

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Progress Report on the Proposed Monitoring System for EMCalorimeter

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  1. Progress Report on the Proposed Monitoring System for EMCalorimeter TV Meeting June 15, 2006 Niigata University/MSU-IIT Anthony Paul D. Ramirez, Hiroaki Ono, Prof. Hitoshi Miyata

  2. Proposed Monitoring System for EMCalorimeter possible location of clear fibers Clear fiber WLS fiber in Strip scintillator GAP for readout GAP for readout GAP for readout

  3. Experimental Setup PMTs WLS fiber TILE and STRIP scintillators are used to gather data. Slits where light enters the scintillators clear fiber scintillator LED (~370 nm) WLS fiber 3M reflector

  4. WLS fiber STRIP scintillator Oscilloscope signal Pulse height versus position on the strip scintillator where LED is used as source Pedestal-signal distribution

  5. Positions where light enters the scintillators (STRIP and TILE) Voltage supply for LED

  6. Sample data gathered in experiments. The left side plots shows the ADC counts from scintillators (tile and strip) while the right side plots are ADC counts for checking the LED. Data for fiber with 15 cuts (TYPE B diameter = 0.7 mm , depth = 0.2 mm) Data for fiber with 5 cuts (diameter = 0.3 mm , depth = 0.2 mm)

  7. In order to compare plots, the data from scintillator is divided by the data for monitoring LED to take into account the fluctuations on the LED The plot is then shifted such that the first point is at 1 at y-axis. with this, the plots for both tile and strip scintillators must be the same…

  8. 2 3 1 4 5 6 The 5th plot shows a higher value even at cut 5. This is a good prospect for type of cut to be used for the monitoring system

  9. 2 3 1 4 5 6 The 5th plot shows (it must be the same result for tile scintillator) a higher count even at cut 5.

  10. 2 1 3 4 Graphs for both tile and strip scintillators (5 cuts only)

  11. Conclusion • The type with cylindrical “cut” (0.3mm diameter, 0.2 mm depth) showed a large count even at cut 5, which means the fiber can be extended and can monitor more than 5 scintillators at a time. • The graph showing the data from strip scintillators showed sudden change in patterns compared with the data from tile scintillators. This maybe due to its small dimension that little change of position of clear fiber causes changes in counts due to direct absorption of light to WLS fiber.

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