Notes from Main Injector/Recycler Group Meeting
Monday, 7 October 2002
Bruce C. Brown

Cons Gattuso -- RR Aggregate Development

     In addition to the other aggregate developments which are
refining new RR procedures, Cons has developed a new SA (secondary
application) tied to the sequencer which provides a visual
representation of the recycler manipulations in the form of a flow
chart.  This display should help users to understand what their
current condition is and what options are provided to proceed.  Other
new efforts include setting plot axes to match current conditions
(especially intensities).  The aggregates under development only
control RR devices so MI or other device changes must be coordinated
properly.

Krish Gounder -- Results of Recent Scraping Studies

There recently have been several opportunities to make measurements
with the beam scraper system.  These have included

     1)  Hor scrape of not-so-well cooled pbars   
	 sigma ~3.5 mm (no MI Ramps)
     2)  Ver scrape of well cooled pbars w/ top jaw
	 sigma ~1.56 mm (emitt = 2.8 pi-mm-mr)
	 IPM measurement before scrape gave 5.6 pi-mm-mr
	 but it is believed that there is a x2 calibration difference.
     3)  Horiz scrape of well cooled pbars w/ wall jaw
	 sigma ~1.55 mm (emitt = 2.73 pi-mm-mr)
     4)  Proton scrape with MI Ramping
	 sigma ~2.79 mm (emitt = 8.94 pi-mm-mr)
     5)  Pbar scrape after big pbar store had data collection problems
	 Analysis by digitizing picture from e-log gave
	 sigma ~2.35 mm (emitt = 6.7 pi-mm-mr)

A preliminary version of the MI Note in preparation on this is available: 
http://www-ap.fnal.gov/~bcbrown/MtgNotes/KG_MINote_on_Scraper_Profiles_021011.pdf
and has been put into the document database as
http://beamdocs.fnal.gov/cgi-bin/DocDB/ShowDocument?docid=377

Brajesh Choudhary -- BPM efforts with Digital Receiver Cards

In addition to the BLT (beam line tuner) efforts using the digital
receiver cards, there are now 4 channels available for use with the
BPM software.  The DSP software filters for a 2.5 MHz signal which it
processes into a sine-like and a cosine-like term which are then
combined to provide position signals.  At present, the intensity does
not get back to the rest of the software system.  Four channels are
currently available with four additional channels to be provided very
soon.  On the study day being reported, the current RR bpm system
provided an RMS error on position of .09 - .16 mm.  New cards gave an
RMS error of .01 to .028 mm.  Measuring the response to a local 3-bump
(calculated using the design lattice properties), one observed

Horiz Bump  Measured -4.95 mm motion  Calculated  -4.65 mm motion.
Vert Bump   Measured  4.65 mm motion  Calculated   2.99 mm motion.

Shekhar -- Short Term Plans

	Try to have several pbar transfers to get 200 mA in RR, then
extract to MI and accelerate to 150 GeV.  Consider getting transfers 
on both Saturday and Sunday which net 50 E10 each, then more on 
Monday.  

Chandra Bhat & Bruce Brown -- PBar acceleration

Still need to work on our kludge for a momentum jump when
going to the MI.  To permit easy development of this, a new
$2E ramp has been developed.  It manipulates the MI magnet 
current to provide an independent reset within the ramp so
that the hysteretic field which is achieved can be controlled
by modifying both the injection current and the reset current.
This ramp is currently structured as follows:

Nom Inj Cur => 40 GeV => Reset Cur => Pbar Inj Cur => 150 GeV