Beam Line

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

.doc file and htm file

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 hast 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:

    - you might have to modify some details 
    - the code should print out the new pedestals at the end 
    - 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:

    - covering at least the area the raster will cover 
    - repeat harp and coda runs