40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Entry  Thu Apr 18 19:54:01 2013, tara, Notes, DAQ, EPICS channel for slow feedback to laser C3PSL_LASER_SLOW.png
    Reply  Mon Apr 22 17:13:24 2013, tara, Notes, DAQ, slow feedback to laser via EPICS is on KP.jpgKI.jpgCTN_DAQ_wiring.png
       Reply  Wed May 8 01:11:09 2013, tara, Notes, DAQ, slow feedback to laser via EPICS is on 
Message ID: 1151     Entry time: Thu Apr 18 19:54:01 2013     Reply to this: 1155
Author: tara 
Type: Notes 
Category: DAQ 
Subject: EPICS channel for slow feedback to laser 

I created a channel for feedback to slow DC to the laser head. The servo will be done digitally using a perl script similar to what we have for the vacuum can.

 

There are unused channels for temperature monitor, so I modify them for FAST MON instead.

In the database file "cavities.db" in the sun machine, I changed [C3:PSL-BOX_SENS1] to [C3:PSL-ACAV_FMON]. For input +/- 10 V.

The next thing is to create perl scripts for the servos. Then find an output channel for feeding back to the laser.

 I made an medm screen for controlling the slow feedback signals to both lasers.

C3PSL_LASER_SLOW.png

 Channels that will be created are:

input

  • C3:PSL-ACAV_FMON

soft channels

  • C3:PSL-ACAV_PID_KP
  • C3:PSL-ACAV_PID_KI
  • C3:PSL-ACAV_PID_KD

 output

  • C3:PSL-ACAV_SLOWOUT
ELOG V3.1.3-