Minutes of DRAGON meeting, May 24, 2005

Present: DFOT, DH, CO, AP, CV, TK, BG, LB, JP, CR, MT, JC

Recorder: JC

- no objections on minutes, as they were sent out at 10:35am

CV reports on 40Ca:

- 100 epA, 8+ 40Ca, from hybrid surface source
- very clean 40Ca beam, little 40Ar and 20Ne
- tried looking for recoils, but hard to say whether any 44Ti recoils or not
- fairly clean where expected 44Ti recoils lie

DH reports that 27Al beam, possibly delivered tonight

AO reports on scaling difficulties:

- CO, CV report that the scaling routine fails by the field settings
being OK, but A/E/Q being wrong ??

FCCH problems: 

- reports roughly half of actual beam reaching it. FCM and FCF read
same values, but FCCH reads half of that. "Beam-in-a-box" testing
indicate readout is fine, so it must be somewhere inside the chamber ??

DFOT reports no obvious leaks in gas target...

Coming week: 
- 26Mg, 27Al, or possibly 40Ca depending...
- 27Al requires DSSSD, no charge state booster, downstream pumping
tubes don't matter for this test
- possibly see if we can establish "useful" intensity of 40Ca
- tentative plan: give Keerthi ~24 hrs to develop more 40Ca, then no
later than Thursday switch to 27Al/26Mg
- need to replace 30degree elastic monitor for 27Al(p,g)
- run plan forthcoming, shift schedule as well

DRAGON meetings: discussion of switching meeting place to main
building conference room on first floor with built-in video
capabilities. AO indicates that a "VERY CUTE" new projector is
available from Melva. Decided that we will try that first.

AP: GEANT simulations of 26Al(p,g)27Si transmission

- finds that transmission is slightly higher for interactions that
happen on the beam left (+x) by 1mm (by a few percent; question: 
statistically significant?)
- mistune in geant simulation by -3% in Energy gives maximum
transmission, but this is not a "real" problem, only a geant problem.
- problem is that heavy-ion energy losses are not done properly in
geant and this feature is simply not supported well, and therefore not 
easy to fix. 
- problem is not fixed from geant3 to geant4
- will check simulation with past data
- Uwe's student will do DRAGON GEANT4 simulation
- AO thinks AP, CR, and AO should "gang up on Peter Gumplinger"

Meeting adjourns at 11:35am