Kara M., Philippe N., Robert S., Sharan B.

Kara has written a script that will make 6 magnetic injections in a row with the parameters that the PEM investigations so far have indicated are optimal. The script is intended to be run by operators every Tuesday morning at 7:45AM. It is called PEM_weekly_magnetic_injection.py, and it is saved in:

/opt/rtcds/userapps/release/sys/h1/scripts/

It can be run with the command

./PEM_weekly_magnetic_injection.py

The script runs for about 7 minutes, making injections through these channels in the following order:

H1:PEM-CS_GDS_0_EXC

H1:PEM-EX_GDS_1_EXC

H1:PEM-EY_GDS_1_EXC

We request that these channels remain exclusively for PEM magnetic injections for the duration of O3. At the moment, the CS channel sends its excitation to the wall-mounted coil in the LVEA (described in 43406), but the EX and EY channels have not been connected to any injection equipment yet (See 46388 for proposed magnetic injection coil plans).

In its current configuration, the script sends a 10-100Hz broadband excitation through all three channels consecutively, then a 100-1000Hz broadband excitation through all three channels consecutively (similar to Figure 4 of 47881). Upon completion, the script will say "Done with all injections."

The script can be interrupted with "Control+C", which stops any ongoing injection and cancels any remaining injections.

The script logs its injections in .txt files containing the parameters for each of the 6 injections in the following format: channel,start_time,end_time,lower_frequency,higher_frequency,gain.

These logs will be saved to

/ligo/www/www/exports/pem/WeeklyMagneticInjection/logs