View source for RTP Driver @ CEBAF Meeting February 12, 2019

==Agenda==
;[https://wiki.jlab.org/ciswiki/index.php/CEBAF_laser_table_historical_photos_and_layout_pdf%27s John's archive of laser table layouts]
;Overview and scope of work slides [[media:190212_RTP_Driver.pptx]]

;Attending
:Aaron, Omar, John, Roger, Caryn, Shukui, Joe

==Additional Materials==
;Caryn's RTP driver schematics and pics [[media:190212_2ndRTPmtg.pptx]]

;[https://www.jlab.org/accel/inj_group/laser2001/pockels_files/pockels_switch_notebook.htm John's notes on Pockel's cells]

 This is a historical background on my history with HV switches for pockels cell here at CEBAF.  It shows what happened before 2007 and then a little about my discovery of the opto- HV switches and why they are useful for this system.  When I told the company about my use, they decided to offer the Opto-diodes in a stand-alone polished package for users like me.

;John's schematics and text (these should be updated into engineering documentation for the new RTP driver)

:: Pockels Cell Dragon Driver 2018 [[media:pockels cell dragon driver 2018.pdf]]
::SFH 4235 [[media:SFH 4235.pdf]]
:: PC Driver Board [[media:pcdriver board 2018.pdf]]
:: PC Driver Schematic [[media:pcdriver 2018 schematic.pdf]]

 I have attached more information concerning the parts of this system that I designed.  It would have worked well if I had used a simple 1-shot at IC5C and IC5D instead of trying to play a delay trick with an inverter gate.  This is the section that is supposed to give the brief "high pulse" to the LED's. NOTE:  It was not mentioned before that these cells are not happy when you leave them at a DC high voltage for an extended period of time.  You can apply an AC or flipping DC for 10 years, but if you leave one at DC, it has an ion migration that darkens the cell.  For this reason, you will notice IC6, which turns off all LED's if the helicity rep rate falls below 5 Hz.