Log entry time 21:07:12 on December 12,2002

Entry number 54103

Followups:

• 54105 12/12/02 22:03 Pitt FastSEE part of Paul's plan

Author: Paul King (pager: 584-7194)

Purpose:


This test plan is to evaluate the ability of the 120 Hz data collection
mode to determine the 60 Hz noise of the beam. We will take data both with
and without Fast Energy Feedback and Fast Position Feedback, which are supposed
to suppress 60 Hz and higher harmonics when they are running.
Also in both states (feedback on and off) we will ask the MCC to do some
"FastSEE" scans of some BPMs.

Time Needed:


About two hours of beam [4 hours with overhead].

Conditions Needed:


Stable beam at a "reasonable" beam current (10-20 microamps);


SMS at 4500 A;


LH2 target in the beam;


Detectors turned on at "reasonable" high voltage settings
("standard proton with reduced gain");


Thresholds should be set at 50 mV for the French and ``5'' for the NA;


The DMCH modules should be operated in Front if Back buddy, with the
NPN ``on''.

Test plan:

1. Take data with beam on the LH2 target in the "ts_scaler" run type
   with the following prescale settings for the time specified.
   The accelerator fast feedback should be on.
   
   

   
   
   

   
   
   1. "Normal" 30 Hz only mode (10 minutes).
      The IA setting should be 5.
      
      

      
      ps1=0xFFFFFF,ps2=0xFFFFFF,ps3=0xFFFFFF,ps4=0xFFFFFF,ps5=0xFFFF,ps6=0xFFFF,
      
      
      ps7=0xFFFF,ps8=0xFFFF,nawidth=0,nathresh=5
      
      

      
      

   
   
   2. A short Oversampling (T120) run (10 minutes).
      The IA setting should be 5.
      
      

      
      enable120Hz,tsnoprogram1,ps1=0,ps2=0,ps3=0xFFFFFF,ps4=0xFFFFFF,ps5=0xFFFF,
      
      
      ps6=0xFFFF,ps7=0xFFFF,ps8=0xFFFF,nawidth=0,nathresh=5
      
      

      
      

   
   
   3. A short Oversampling (T120) run (5 minutes).
      The IA setting should be 1.
      
      

      
      enable120Hz,tsnoprogram1,ps1=0,ps2=0,ps3=0xFFFFFF,ps4=0xFFFFFF,ps5=0xFFFF,
      
      
      ps6=0xFFFF,ps7=0xFFFF,ps8=0xFFFF,nawidth=0,nathresh=5
      
      

      
      

   
   
   4. A short Oversampling (T120) run (5 minutes).
      The IA setting should be 9.
      
      

      
      enable120Hz,tsnoprogram1,ps1=0,ps2=0,ps3=0xFFFFFF,ps4=0xFFFFFF,ps5=0xFFFF,
      
      
      ps6=0xFFFF,ps7=0xFFFF,ps8=0xFFFF,nawidth=0,nathresh=5
      
      

   
   
   
   
   

   
   (30 minutes)
   
   

   
   



2. Have the accelerator do "FastSEE" scans of the SEE BPMs for the
   energy determination and for one or two other BPMs and log them into their
   logbook and then you can put appropriate links in our logbook..
   
   

   
   Mark Pitt suggests:
   I would recommend having them do 3C12 (for the energy) and then the most
   downstream BPM they can do. It looks like the most downstream one they
   could do in September was 3C17, but I would ask if they could do 3H00A or
   (even better) 3G0B. If the MCC is having any troubles with this (and it
   is during the daytime), you might want to ask them to consult Richard
   Dickson who is the expert on this system.
   
   

   
   (?)
   
   

   
   



3. Have the accelerator fast feedback turned off.
   Take data with beam on the LH2 target in the "ts_scaler" run type
   with the following prescale settings for the time specified.
   
   

   
   
   

   
   
   1. A short Oversampling (T120) run (5 minutes).
      The IA setting should be 9.
      
      

      
      enable120Hz,tsnoprogram1,ps1=0,ps2=0,ps3=0xFFFFFF,ps4=0xFFFFFF,ps5=0xFFFF,
      
      
      ps6=0xFFFF,ps7=0xFFFF,ps8=0xFFFF,nawidth=0,nathresh=5
      
      

      
      

   
   
   2. A short Oversampling (T120) run (5 minutes).
      The IA setting should be 1.
      
      

      
      enable120Hz,tsnoprogram1,ps1=0,ps2=0,ps3=0xFFFFFF,ps4=0xFFFFFF,ps5=0xFFFF,
      
      
      ps6=0xFFFF,ps7=0xFFFF,ps8=0xFFFF,nawidth=0,nathresh=5
      
      

      
      

   
   
   3. A short Oversampling (T120) run (10 minutes).
      The IA setting should be 5.
      
      

      
      enable120Hz,tsnoprogram1,ps1=0,ps2=0,ps3=0xFFFFFF,ps4=0xFFFFFF,ps5=0xFFFF,
      
      
      ps6=0xFFFF,ps7=0xFFFF,ps8=0xFFFF,nawidth=0,nathresh=5
      
      

   
   
   
   
   

   
   (20 minutes)
   
   

   
   



4. With the fast feedback off, have the accelerator do "FastSEE" scans
   of the SEE BPMs for the energy determination and for one or two other BPMs.
   
   

   
   (?)
   
   

   
   



5. With the fast feed back off, take a "Normal" 30 Hz only mode (10 minutes).
   The IA setting should be 5.
   
   

   
   ps1=0xFFFFFF,ps2=0xFFFFFF,ps3=0xFFFFFF,ps4=0xFFFFFF,ps5=0xFFFF,ps6=0xFFFF,
   
   
   ps7=0xFFFF,ps8=0xFFFF,nawidth=0,nathresh=5
   
   

   
   (10 minutes)
   
   

   
   



6. If we receive permission from Hall B to try adding
   60 Hz noise:
   
   
   

   
   Mark has suggested that it may be possible to use the ``injector
   fast feedback'' to introduce 60 Hz noise in the beam.
   He reports that it:
   uses steering coils in the 100 keV
   part of the injector to correct for 60 Hz beam motion (mainly for Hall B).
   But it can also be used for deliberately inducing 60 Hz motion if desired.
   The guy to contact would be Richard Dickson, and it would have to be done
   sometime when Hall B agrees to it since it is exactly what they don't want.
   
   

   
   If Hall B agrees, and Richard Dickson is able to set this up to introduce
   60 Hz noise for us (all of these should probably be done with the
   Hall C fast feedback turned off):
   
   

   
   
   1. Have MCC do some FastSEE scans without the additional 60 Hz noise.
      
   
   
   2. Without additional 60 Hz noise, take a 10 minute run in
      30 Hz mode.
      
   
   
   3. Without additional 60 Hz noise, take a 10 minute run in
      120 Hz mode.
      
   
   
   4. After adding additional 60 Hz noise, take a 10 minute run in
      30 Hz mode.
      
   
   
   5. After adding additional 60 Hz noise, take a 10 minute run in
      120 Hz mode.
      
   
   
   6. Have MCC do some FastSEE scans with the additional 60 Hz noise.
      
      
   
   
   
   
   

   
   ( WIDTH="41" HEIGHT="28" ALIGN="MIDDLE" BORDER="0"
   SRC="img1.png"
   ALT="${}>40$"> minutes)
   
   

   
   



7. Have the fast feedback turned back on, and restore the prescales
   to 30 Hz mode, and verify the DAQ has restored to normal operation by
   taking a few minute run (10 minutes).
   
   

   
   (10 minutes)
   

Analysis Remarks:


The standard analyzer is not yet able to properly decode the
120 Hz data. Jason will use a preliminary version of the 120 Hz
analyzer to evaluate the 60 Hz residual as a function of 60 Hz
phase.

The data from the FastSEE scans should be examined to estimate
the suppression of 60 Hz noise when the fast feedback system
is operating to be compared to what is extracted using the
oversampling.