From slaughte@fnal.gov Fri Jan  9 13:47:55 2004
Date: Fri, 09 Jan 2004 13:43:05 -0600 (CST)
From: Jean Slaughter <slaughte@fnal.gov>
Reply-To: slaughter@fnal.gov
To: slaughter@fnal.gov
Cc: il1of12@yahoo.com
Subject: notes

Notes, Jan 7, 2004, Instrumentation/Beam Physics Meeting

Today^Òs agenda:
	1. SyncLite work - Stephen P.
	2. uniform long. Emittance measuring system - Fritz
	3. update on MI intensity measurements - Krish

Next meeting - Jan 14, 2:00-3:30 Huddle - Tev tune measurements

1. SyncLite
     During the 16 house quench down period, SyncLite was slid out of the
     beam line.  Both P and Pbar arms were inspected and look to be as
     documented.  The mirrors are barely into the beam pipe.  In the
     proton arm, the filter was adjusted to aim light at the photodiode.
     In the Pbar arm, a laser was put where the beam would be coming in.
     The purpose was to measure the resolution of the system.  This was not
     very successful as the data don't make sense.  It was found that the
     inside of the beam pipe is very shiny and reflections can be focused
     onto the camera.  The system was put back in the beam and appears to be
     working just like it did before the exercise was done.

    Next steps:
	1. investigate getting a non-shiny beam pipe
	2. move the pbar mirror
	3. do a separator scan
	4. setup a test system upstairs
        5. instrumentation studies request Stephen sent to Vladimir.

   Alvin suggested that one could use a polarization filter to get rid of
   reflections.  Vic suggested baffles.

2. Uniform longitudinal emittance measuring system

	1.  There will be a prize for a suitable acronym
	2.  Fritz's slides will be included in the document area.
	3.  Bob and Fritz  have a scope on loan and are investigating if
            it is suitable. A scope will be ordered in the next week or
            so.  The goal is get a first order implementation up and going
            as soon as possible.
	4.  Based on discussions during and after the meeting, Fritz is revising
 	    his plan.
	5.  There may be a free device that can be used for developing the
	    system.  Alvin was  very concerned about noise and reflections
	    when using the multiply split signals.

	6. Adam Para described his progress in implementing Alvin's
		algorithms.  He has talked with Bob Flora and knows
		how to interface into the existing code.  He had questions
		about the lack of robustness in the fits when he can't
                average like Alvin was doing.  Interpolation will probably be a
		solution, but the detailed discussion was taken offline.

3. Update on MI intensity devices - Krish
     1. Krish's talk is document 964.  His conclusions were that the
		relative scale factors for  DCCT, SBD, FBI are the same
		as before the shutdown.  (They were moved).  However the
		spread, particularly in the SBD, had gotten worse, from about
		2.5% to 5%.
     2. Krish is going to investigate the spread to see if the baseline is
		 moving up or down or anything else obviously wrong with
		the signals.
     3. Possible explanation for increased SBD spread.  Jean reported
		that Vaia has found that the MI SBD was missing  data.
		After the meeting we learned from Bob Flora that the digitizing
		range was being under utilized.  He suspected that the
		signals were marginal.  Just before store 3132 he changed the
		gain on both the p and pbar signals up by a factor of two.
	 	He doesn't know the recent history of these gain settings
                but will try to find out from Chandra.


Jean Slaughter
Beams Division MS 306
Fermilab, Batavia, IL 60510
pager 630-218-3081 (best)
phone 630-840-3993