Krishna had suggested that we could use an intermediate blend filter for the BSC (more aggressive than the 750mhz blends, less aggressive than the LLO blends), to take advantage of the sensor correction. At the SEI call today, it was suggested that we try the 01_28 blend being used on the HAMs, which is a ~250mhz blend. After a little hacking, I was able to get something that could be installed. All I had to do was make extra copies of the filters in a mat file and change some variable names, but it took a little while to figure that out. The blend routine was then able to compute the complementary filters for the T240 and L4C's. The X and Y blends for St2 look a little funny, they aren't quite complementary above the blend, but we don't need these filters for St2. See attached plots for complementary forms, St1 on the first page, St2 on the second page.
I won't install these new filters until next week, so I won't risk disrupting commissioners.
J. Kissel For the record, the design of sensor correction filter installed with which we hope to get improvement by increasing the blend frequency is detailed in SEI aLOG 594. Though this filter was originally designed for use in the Z DOF, it has been installed in the X direction on H1 ISI ETMX.