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

[Jay Benesch]

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