[Louis, Gabriele]
We did again the noise injections for retuning the MICH FF, analysis and fit will follow tomorrow.
New fit done, loaded into FM2, not tested yet.
We tested the new FF, and it didn't perform as well as expected. However
- the old FF filter now performs worse than right after it was tuned
- the new FF filter performs better than the old one now
We therefore used the measurement to fit another MICH FF, we'll test it soon
Gabriele created two new filters in FM1 and FM2 to try out in DARM. Currently, we are using FM3. I ran an injection using the current filter, and then for each of Gabriele's new filters. Overall, if we want the most suppression 10-20 Hz, we should go with the current, FM3. If we want to do better 20-40 Hz, we can choose one of the new filters. FM2 is worse from 40-70 Hz, but I'm not sure how much that matters. FM1 will inject a few dB more noise than the others from 7-10 Hz, again, not sure how much that matters. I am staying with FM3 pending some evaluation.
