After the work done on the laser bench during the morning shift(43914), we recovered standard working conditions of the Injection system.
We started by checking the IMC locking loop and we optimized it. We increased the gain of the loop by 5dB (att from 17 dB to 12 dB). Note that now the IMC locks between 5dB and 22dB.
We measured the OLTF of the IMC (see figure 1). Now the UGF is 180 kHz. Unfortunaly we had some troubles with the floppy disk drive and we couldn't save the data.
I tried to superimposed the amplitude of the TF on our reference curves (see figure 2). Yesterday's measurement is represented by the black line on the top plot.
All the loops have been closed properly and the ITF could be locked without much problem afterwards. The gain change noticed on the SSFS loop is likely to be related to the optimization of the IMC loop.
