chalice 4
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Notes of LAPPD Photocathode Development
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scanMap2 Electrometer data from QE measurment position scan at 350nm 3D plot scanMap3 Same but Contour plot histo1 100 read histogram with mean and standard deviation and equal area gaussian. histo6 Six histograms of 100 reads Ed May
A python program has been created which moves the light source (monochronometer) in a square spiral from the Chalice center via the VMX controller. The Keithley electtometer current is recorded and the x,y position is recorded to a logfile. A 9 point test scan and current vs position map is shown in figure at spiralScan. Ed […]
I have completed the first version of some Python based programs to implement basic operations for the VMX transport motor controller when using the RS232 interface. They are located in the directory /home/LAPPD/VMX There is a README file which describes the basic operations. Currently README contains: Some Python scripts have be prepared to issue typical […]
electrometer circuit for QE This is a sketch of the circuit used to readout the current with an electrometer during QE measurement on photocathode deposited on Chalice. It was found the signal to noise ratio when using the mono-chronometer was poor. The noise level observed in the electrometer was unacceptably large. It is believed to […]
RGA log during Chalice Bakeout 9-12 Mar 2012. During AM 12 March heater turned off. Upgraded to show proper date/time axis. Ed May