Notes from Local Meeting on May 27, 2004
In attendance: Tim Holmstrom, Ryan Snyder, Kent Paschke, Riad Suleiman, Bryan Moffit, Lisa Kaufman, David Armstrong, Rich Holmes
General Info
- HAPPEX installation begins Friday June 4 because Pentaquark was extended.
- Optics running will be June 8 or 9.
- Take out sieve on June 9 or 10.
- Cool He starting June 10 or 11.
Source
- Source install will be June 4 or Monday June 7.
- The source group has planned to install the Ocelot-2 laser for Hall C and possibly reactivate cathode in Gun 3.
Injector Beam Studies
- We observe differences in our results from previous beam studies.
- Cathode seems to have small analyzing power, but RHWP seems to have a large analyzing power in comparison.
- We see big position differences due to helicity-correlated clipping related to injector transmission.
- We need to tell accelerator (Reza) that we will certainly need high injector transmission for the HAPPEX run.
Phase Trombone
Target Boiling
- It seems like the 4 cm LH2 target was boiling as 1/(area of raster) but Hachemi will do a more detailed analysis.
Septum
- 7.2 K with 15 uA on the 15 cm LH2 target.
- This temperature is approx. 1 K above septum temp with no beam current.
- We need to decide on a lower limit for the amount of current we can take on the 20 cm or 15 cm cell due to septum heating and/or target boiling.
- Sieve slits will be installed during the detector install - perhaps we could look at septum heating by ramping up current on Carbon.
Tim
- MySQL database is started and seems to be working.
- EPICS data from starts and ends of run included in database.
- 24 Pb blocks need to be moved for septum shielding.
- Tim has been trained for Pb - need two more people. Riad and Bryan volunteered to help. Riad is also already Pb trained.
Bryan
- Runbird gui is up and running.
- shows status for each kind of feedback.
- help button needs to be updated.
- will also make expert button to change slopes, etc.
- will also list iocs that runbird talks to in order to diagnose problems with the readbacks.
- Making and finding cables for HAPPEX detector.
- Made one ADC for H, He, Profile detectors with gains: 2 channels @ 20 uA, 1 chan @ 6 uA, 1 chan @ 2.5 uA
- Need to make 2 more ADCs - one for the other spectrometer and a spare.
- Now we need to test feedback - Lisa will give him the IA and PITA slopes.
Rich
- Made link from HAP webpage for shifters info.
- how to page
- panchain.C macro to look at multiples runs at a time - need to make a global counter.
Lisa Kaufman