Minutes 2005-07-12
begin 10:45
present DH,TK,HC,LF,BW,AP,LE,JP,MT,JDA,AL,JC,RL,AC,AO,DFOT,AH,MH,BG,CV 
(recorder)

0) after run party:
    no alcohol is allowed on site any more (without an authorized, outside 
catering firm)....breaking a 30-year tradition...

1) Hardware:
    MD1 power supply problem after switching off at the end of the run
    Q3 is leaking
    mass slits need some safety
    gas target is warming up (Helium will be used if the TUDA run needs gas in)
    Ge detector will be refilled until calibration measurements are finished
    HC (with help from LF) will calibrate Ge, NaIs and DSSSD
    it is planned to measure the dead layer of the DSSSDs again using the 
box in the detector lab. AO and AH will look after the electronics. TUDA's 
3alpha source will be used for that.

2) End of 26gAl run (E989):
    CR/AP presented analysis of runs with old DSSSD only
    AP: ET^2 plot (attachment 1) leaky beam used as calibration for mass 26 
(E from DSSSD, T from local TOF), good recoil events show up at mass 27.2
    CR: probabiltiy analysis (similar to DH's)
        for DSSSD energy a exponetial tail is used, for recoils a gaussian 
distribution at the position from energy loss calculation in gas, MCP foil 
and dead layer
        x-distribution: for recoils a gaussian shape around the center 
whereas leaky beam shows up on left side
        attachment 2: black dots big TOF window for background, red dots 
for small TOF window where the recoils are expected
	      good events should be on the bottom right side
    half-height events in DSSSD E not used at the moment
    DH: leading gamma E distribution can give additional discrimination, we 
need GEANT simulation for spilled 26Na

    we have 2 +/- 1 good events after the energy change to 199 keV/u, 
"events look more centered at the gas target..."

    CR will ask for additional beam time (~3 weeks) in fall
    a report should be ready in September

    some discussion about 26Na reduction to reduce spill at target
      tuning beam: better focus at the target instead of parallel beam
      beam skimmer (slits or iris aperture) at a focus point upstream (FC4 
position)
      larger entrance aperture of gas cell
    end of July we should decide what strategy we use for the next run

3) E1027 Implantation of 22Na:
    JC showed slide show (attachment 3)
    only 50% transmission of both stable 23Na and 22Na + less than 1 nA of 
22Na allowed only to make a ~10 uC target
    samples are still in the implantation station
    quoted beam intensity was 25 nA, but maybe measured with bias at FC off !?

4) Upcoming runs:

    TUDA 12C + 12C run (E1031):
      requires precise beam energy measurement - can be done at DRAGON 
using MD1
      energy range 6.6 to 8 MeV, 60 keV/u per energy change

    16O + 12C (E1022 Strassburg people)
      solid target ladder, they provide man power, only some local help needed

    40Ca (E1024)
      a few days in August 18-21 and one week in September 15-19 (12/13 
40Ca dev.)
      Michael Paul from Israel and Toni Wallner from Vienna plan to come 
for the September run
      a minor modification of the charge state booster is necessary to 
protect the thin CSB foil when they are in out position

5) AOB

    EEC was in general happy with E995 (alternate prodution of radionuclides)

    Beam request for fall:
       19Ne - possible candidate for FEBIAD ion source test in December 
(for DRAGON and TUDA)
       26gAl - 3 weeks
       22Na - cont. of implantation
       40Ca - phase II (if approved by EEC)
       27Si - charge state distribution for E989

    BW presented work on HVcalib, MCP TAC time vs. DSSSD strip calibration, 
advances in DRAGON ROOT TREE structure (Attachement 4)

    still some photos for the homepage missing, should be finish today and 
sent to MT

    MT, AO are setting up alternative elog for comunication of data evaluation


end of meeting 11:50