Coating Ring-down Measurement Lab elog
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Mon Jan 30 15:16:54 2017
Four samples in chamber
checked that the high voltage paths are working:
the DAC signal is properly received and amplified by the Trek 2220 HV amplifier
the HV switch box is working as expected: I can switch on and off each path individiually using the DAC signals
installed four samples (refer to the optical drawing for the numbering)
S1600472 in bay 1
S1600478 in bay 2
S1600473 in bay 3
S1600480 in bay 4
balanced all samples and centered all optical levers. There is a problem with the fifth connector in the ADC interface board (or maybe with one ADC channel). So one of the quadrants of QPD4 was not working. I moved the connector to number 6 and updated the model. Everything looks fine now.
the power in the four QPD is quite diverse: this is not unexpected, since it depends on the interference of the reflection from the two surfaces of the disk
installed the picomotor controllers on the bench, connected them to the net using the switch on the top of the clean room. For the moment being they are using DHCP.
connected all picomotors to the controllers.
Bottom controller, from left to right: QPD1x, QPD1y, QPD2x, QPD2y
Top controller, from left to right: QPD3x, QPD3y, QPD4x, QPD4y
tested the remote control and motion of all picomotors