I took the opportunity this evening to start tuning the magnetic injection coils to find appropriate gain values for when we drive them. I was able to get through both frequency bands (10-100 Hz and 100-1000 Hz) for the CS vertex, CS SQZ-bay, EX VEA, and EX E-bay coils. To find the right values, I drove the coil using a uniform noise awg injection with an 8th-order butter bandpass filter around the frequency range and changed the gain until I saw saturations on either the ADC for the nearest magnetometers or the DAC driving the coil, then lowered the gain until no more saturations occurred. I plan to finish tuning the remaining coils tomorrow.

After these coils were tuned, I updated the injection gains in the PEM_MAG_INJ guardian and used it to run through all eight injections with a 128-second duration. This proved to be a useful test of this guardian node; the resulting injection log file is:

/ligo/www/www/exports/pem/WeeklyMagneticInjection/logs/1367909400.txt

and is attached for reference.