Microchannel Plate Power Supply CW power supply Powers screen and channel Voltage ramp feature protects MCP Remote control via TTL input Grazing incidence 'noise' suppression

The Model 735 operates single stage or chevron microchannel plate intensifier assemblies. It provides high voltage to the MCP assembly screen and channel as well as low voltage for use when operating in the positive channel mode.

Operation of microchannel plates implies a vacuum of at least 10-6 torr. The best vacuum systems however are still subject to human or other failure. The arc protection circuit (interfaced to pump controller) adds a safety factor not available with other supplies.

Additional features include the optional addition of supplies required to operate 2 stage or chevron type assemblies. Also, the voltage applied can be set to ramp slowly to full MCP assemblies this way extends their life by eliminating sudden power up and possible arcing.

Model 735 microchannel plate power supply Specifications

Specification	Screen	Channel
Voltage	+/- 5000-V	+/- 2000-V
max Current	500-uA	500-uA
Ripple	< 10-mV P-P at max output	< 25-mV P-P at max output
Stability	0.005% per hour	0.005% per hour
Readout	LCD Display	LCD Display

Model 735 General Features

Remote Operation	TTL input
Suppression	0 to 15-V (neg polarity) with LCD readout, use in positive channel mode
HV Ramp Time	selectable from 0.25 to 60-minutes
HV, arc and Vacuum Status	LED inicators
Vacuum Failure	Audible alarm
Supply	selectable, 110 or 220-V operation

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On grazing incidence spectrometers sometimes "noise" caused by stray electrons and ions overwhelms the signal of interest. Use of suppression eliminates this unwanted contribution. The graph shows electron noise as a gray line which was eliminated from the spectra (black) by applying low negative voltage to the microchannel plates face. The suppression feature is standard in the Model 735 microchannel plate power supply.

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