Restored B beam was definitely scraping on the Lambertson
Log Number: 4483728Logbook(s): Entry Makers: alexsBody:
We knew that Hall B's beam was low on the Lambertson viewer before doing AT09V steering at the start of the shift. After restoring the allsave from the start of the shift, things restored even worse than when the save was made. There were clear signs that a significant amount of the beam was getting scraped off around the Lambertson. Steering with the AT09V corrector got us back to the full current reaching the hall and minimized loss rates. Resteering target positions to come, but this change was necessary if we ever hope to run more than 10 nA to Hall B without tripping BLMs.
