INSTRUMENT MODIFICATIONS: MULTI-COLLECTOR FC AMPLIFIER PUMP (2010)

Multi-collector FC amplifier housing should be under vacuum (~0.2 torr) in order to reduce noise from radioactivity in the air. Original system was connected to rough pumping line of detection chamber 500L turbo pump, so that amplifier housing was evacuated until it reach a certain pressure (<0.1 torr) and left closed without any pressure monitor. The amplifier housing vacuum leaked significantly over the time, which would degrade noise level. To maintain the stability of gain and noise level of the amplifiers, we added stand alone small scroll pump dedicated to the amplifier housing and additional Thermo Couple (TC) gauge. The housing is kept under the constant pressure (~0.2 torr).

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