From:	James P. Morgan
Sent:	Friday, March 30, 2018 3:04 PM
To:	Brendan Kiburg; Nathan Froemming; Dean A. Still
Cc:	Gerald E Annala; Brian E Drendel; Nathan Froemming
Subject:	Proposed momentum scraper study

Hi,

   Nathan and I would like to do a study that would involve selecting different "slices" of beam 
with the Delivery Ring momentum scrapers and to determine the momentum distribution of the 
injected muon beam into the g-2 Storage Ring. We would also like to do a shorter study using 
the same scrapers to measure the dispersion in the M4/M5 Lines. It would be most efficient to 
do these two studies together, but the dispersion measurement could be separated if need be.

   The first study will involve data from the experiment and we will need a healthy Ring and 
DAQ. We would like to have the experiment do runs for 5 different central momentum slices in 
the Delivery Ring. The outer slices will likely have a lower number of stored muons, so I would 
like to have longer runs for these points. In addition to recording decay positrons and T0 values, 
we would request three additional numbers from the tracker team: The equilibrium horizontal 
position, The horizontal CBO amplitude and the horizontal CBO lifetime.

   I expect the study to take about 5-6 hours: 1 hour or less for the dispersion measurement, 1 
hour each for the outer momentum slices and 45 minutes each for the three inner momentum 
slices (plus restarting runs, etc.). I think the experiment could still use the data from these runs 
as these slices of beam all normally contribute to stored muons by varying degrees. The counts 
will be very low during the dispersion measurement, but again these slices of beam 
normally  reach the Ring.

   I'd prefer doing the studies during weekday day and/or evening shifts and we'll be ready to go 
early next week, whenever time is available.

   Thanks,

    Jim