Revision as of 15:42, 2 December 2021

Friday, December 3

1. Last 24h:
   • Tried re-tuning the beam yesterday (reducing MQP5C11). Resulted in lower PS rates (~2.8 kHz) consistent with what was observed previously when we tried this. See: [1],[2]
   • After reverting to optics before the change, PS rates back up (~3.3 kHz). See: [3],[4]
2. Issues:
   • (not urgent but noted) Hall D staff need access to retrieve CPP equipment in the next week.
3. Plan:
   • run on carbon at 150nA´
   • Rotate the radiators and use both configurations
   1. • Stop the beam ALWAYS before changing the radiator configuration (even with the same radiator). Between radiator change (0/90 <--> 35/145) ALWAYS ask MCC to insert the dumplette.
4. Analysis update

Thursday, December 2

1. Last 24h:
   • Established beam last night before midnight.
   • Harp scan extrapolation looks to be focused a bit differently than before. PS rates seemed around 3.2kHz as before with 150nA beam so we kept this.
   • Radiation levels at 50nA acceptable.
   • Continued production on C target at 150nA. Beam not available for most of Early Riser shift so far.
2. Issues:
   • Rates came back lower [5]
   • Tagger magnet came back at slightly lower field [6]. From meeting this morning "DC Power lowered HMax from 290 to 285A and supply cycled fine."
3. Plan:
   • run on carbon at 150nA´
   • Rotate the radiators and use both configurations
   1. • Stop the beam ALWAYS before changing the radiator configuration (even with the same radiator). Between radiator change (0/90 <--> 35/145) ALWAYS ask MCC to insert the dumplette.
4. Analysis update