Beam Line

E06-010 Instrumentation Requirement List: Jian-Ping Chen's memo to Kees De Jager, 08/07/08

.doc file and htm file

File of Physics/MCC experiment planner, by MCC Lester Richardson 10/21/2008

doc file page-1 and pdf file page-1, doc file page-2 and pdf file page-2

HARP and HARP scan procedures

Please follow the directions at the Harp Scan Page [Harp Scan page]

Beam position monitors (BPM) and calibration procedure

How to perform a BPM pedestal run:

1. MCC has to follow the following procedure:

    - open BPM window "BPM Diagnostics - SEE"
    - from there pull down the "Expert Screens" and open "Gain Control"
    - for IOCSE10, use the pull down window and change from "auto gain" to "forced gain". 
    - then change the forced gain values x and y to zero.

2. CODA has to run in pedestal mode:

    - if you were running before you first have to press Abort
    - choose the appropriate configuration in runcontrol
    - select "PEDRUN"  - Press RunTypes button in RunControl

3. Have MCC change the BPM gain back to "auto gain".

4. Run get_bpm_pedestals.C in the root analyzer: Updated on October 26, 2008!

    - this code is now available from the onlana account on the adaq machines
    - run analyzer and type:
          get_bpm_pedestals(<runnumber>,<number of events>) with the run number and number of events you want to replay. 
    - the code should print out the new pedestals at the end 
    - an expert  should load the database into an editor and change them (2nd line of the [BPMx] blocks)

How to perform a bulls eye scan:

1. You need unrastered beam:

    - caution you should not do this with a target requiring rastered beam
    - use carbon, BeO, optics, or in the worst case empty instead

2. Ask MCC to steer the beam to the nominal center of the target.

3. Wait until beam is stable and perform a harp scan and a coda run during the same time.

4. Ask MCC then to steer the beam to positions around the nominal center:

    - cover at least the area the raster will cover: (2,2), (2,-2), (-2,-2), (-2,2) and repeat (0,0)
    - repeat harp and coda runs for each position

How to analyze the bulls eye scan:

 - detailed instructions can be found at the Analyzing BPMs website.