Some Remarks on Calibration of BCAL.  After recent communications with the BCAL team, seems that we have to use a 2 wire cable, 5- 10 cm, from the board.

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Presentation transcript:

Some Remarks on Calibration of BCAL.  After recent communications with the BCAL team, seems that we have to use a 2 wire cable, cm, from the board so as only the LED is attached on the light guide. I made some tests and I didn’t measure any deterioration of the signal.  Do we need an extension with the trapezoidal L-Gs?

Pending issues.  Position and support of the board. Piggy-back on the Amplifier board. Any other suggestion from the engineers.  Protocol: Any 2-wire protocol. Serial Xon/Xoff as requested.

Intensity and Dynamic Range.  Intensity can be Controlled by: Dc Voltage Adjustment. A piece of Film Filter between LED and the Light Guide.  Range: Using an LED with Longer Wavelength, Below the Absorbing Band of the Fiber (not enough). Lower the Voltage of Near Side to a Safe Value, while Pulsing the Far Side. Possible magic.

Test with trapezoidal light guide. There is enough space between the L-Gs for the LED board. We positioned the board 3 cm from the photocathode. We used the demo, (baby) calorimeter. We measured the pulse high at the near and the far side. The ratio near / far was 8 to 10. Variation because of positioning.

Pictures of Light guide with LED board.

Pictures of pulsesI Near side Far side

Pictures of pulses II Near side Far side

Other Approaches.  Return to fibers.  Not as elegant as it sounds. Splitters Cost ~ 2000 $ for 16 channels Inflexible Need Groove on Light Guide.