[BTeam] B beam is blown. For that matter, the whole machine is blown.

[Jay Benesch]

More recent material

Ops matched at 7E01 https://logbooks.jlab.org/entry/4381741
harp traces post-match
https://logbooks.jlab.org/entry/4381745 7E01 A beam
https://logbooks.jlab.org/entry/4381746 7E01 B beam still big
https://logbooks.jlab.org/entry/4381751 AE01 A beam
https://logbooks.jlab.org/entry/4381755 AE01 B beam still big
https://logbooks.jlab.org/entry/4381756 2C05 X below design, Y 3x design
https://logbooks.jlab.org/entry/4381753 Hall B now makes it to the 
dumplette without tripping ILM7S/9S01!

My recommendation to reduce the B laser spot to ~1.3 mm round still 
holds.  I also recommend rematching Injector to NL  YMMV

On 5/23/25 07:16, Jay Benesch wrote:
> Colleagues,
> 
> A selection of elogs.  Scan the logbook for a fuller picture.
> 
> https://logbooks.jlab.org/entry/4380694 Yan's summary Wednesday
> https://logbooks.jlab.org/entry/4381729  IHAAE01 with B beam
> https://logbooks.jlab.org/entry/4381709  IHAAE01 with A beam
> https://logbooks.jlab.org/entry/4380687  chopper scans - B beam widest
> https://logbooks.jlab.org/entry/4380556 laser size measurements in pdf
> 
> All values 4 sigma from pdf
> A laser X 1.60 mm Y 1.61 mm
> B laser X 1.92 mm Y 2.00 mm
> C laser X 1.22 mm Y 1.27 mm
> D laser X 1.27 mm Y 1.42 mm
> 
> Joe told me that they allow a larger spot for B because of the narrow 
> slit.  The slit constains the beam in the longitudinal dimension, not 
> transversely.
> 
> I suggest the B laser spot be adjusted to match C and D, ~1.3 mm in both 
> planes, this morning.
> 
> https://logbooks.jlab.org/entry/4381707 fopt results with half-kick. 
> Scraping in AL and BL.  No response on the first kick in either plane 
> implies to me that the injector-NL match is blown.  The sensitivity to 
> MBL0R03 suggests the beta functions there are far larger than the design 
> (x,y) (19.1, 13.3) m.
> 
> Jay