I've set up a PID script that senses the EX-PSL Green Beat note (from the frequency counter) and actuates on the temperature of the end laser to drive the beat note to a given setpoint.
- I've added the necessary EPICS channels to
c1iscaux and rebooted it so that the channels are live. They are listed in a new database file slow_grnx_pid.db
- This database was added to the list of those loaded by
startup.cmd.
- The PID script,
GRNXSlowServo, is just a modified version of FSSSlowServo.
- The version I've been running is currently in /cvs/cds/caltech/users/abrooks/.
- There's also an MEDM screen in this directoy,
C1LSC_EX_GRN_SLOW.adl, there that shows the PID settings.
Right now the script only passes the initial sanities checks, that is:
- It runs.
- You can enable/disable it without any errors and it starts actuating.
The settings all need to be tuned up - e.g. maximum_increment, hard_stops, time_step, PID constants.
Additionally, the units in the whole thing are pretty useless - some of the channels are in VOLTS, others in WATTS. I'd like to change all these to be in Hz.
EPICS channels added:
grecord(ao,"C1:LSC-EX_GRN_SLOWKD")grecord(ao,"C1:LSC-EX_GRN_SLOWKP")- grecord(ao,"C1:LSC-EX_GRN_SLOWKI")
grecord(ao,"C1:LSC-EX_GRN_PID_SETPT")grecord(ao,"C1:LSC-EX_GRN_TIMEOUT")grecord(stringin,"C1:LSC-EX_GRN_SLOWVERSION")grecord(bi,"C1:LSC-EX_GRN_SLOWLOOP")grecord(bi,"C1:LSC-EX_GRN_DEBUG")grecord(bi,"C1:LSC-EX_GRN_SLOWBEAT")
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