MINUTES OF DRAGON MEETING : NOVEMBER 04, 2003
Present: MMP (recorder),JDA,DH,AO,LB,NC,MT,DFOT,CJ,DG,PM,Zl,JR(at 11:20)
Agenda includes: 
1. Minutes of Meeting of Oct. 29, 2003 ( circulated previously) 
2. Business arising 
3. Facility notes: 
        -report from solid target run 
3. Status of the Run in progress C12(alpha,gamma) LB 
4. GEANT simulations MT 
5. AOB

MEETING STARTS 10:40
1. Some minor corrections to Minutes of Oct 29 noted by LDA. 
        Corrected version approved.
2. Next week meeting WED NOV 12 in the afternoon (time/place TBA). Nov 
        11 is a stat holiday.
3. 12C+12C solid target run : DH (figures attached) 
  o generally successful run 
        - target lived 
        - runs 10097-10100 showed indications of 24Mg peak in DSSSD 
        with 10100 (std tune -4%) showing clearest indication 
  o acceptance issues discussed 
        * needs to be studied in more detail 
  o glass is a good scintillating material to view beam spot 
        - no ill effects. beam stops in glass 
        - Kapton blackens over time so not as good 
  o not sure of 12C target thickness, hence energy loss 
        - can't bend 1.46 MeV/u 12C+++ beams 
        - some speculation that residual gas in system might be used to 
        strip beam to 6+ charge state, and then we can bend that. 
        * need to sort out energy loss/thickness issue 
  o Elastic monitor responsible for ~99% of all events. 
        - DH speculates that 12C+12C--> a+X AND p+Y could explain it
** ACTION ITEM 
        - some question as to BGO voltage settings. Spectra puzzling 
  => PUT BGO VOLTAGES ON PRE-RUN CHECKLIST 
        - CHECK FOR MESSAGE ON ODB INDICATING MISMATCH BETWEEN 
        ACTUAL VS. ODB VOLTAGE SETTINGS
4. "Real" 12C+12C run starts Mon. Nov. 10 --> Nov 16 (?) 
        - group from York arriving this weekend 
        - bodies will be needed to supplement York crew
5. 12C(alpha, gamma)16O report from LB 
  o in principle, weekend scan of quads done to check acceptance 
        * however, LB notes _huge_ fluctuations in nrmlzd yields (x2,x3) 
        - tune dependent, doesn't appear reproducible 
  o (near endless) discussion ensued of what could be causing this 
        a) beam mistuning ? 
        > doesn't explain why _normalized_ yields change 
        b) charge state fractions of recoil changing ? 
        > no convincing mechanism 
        c) data acquisition ? 
        > dead times don't appear that large though 
        > however, dacq could be stopping for periods of time 
        though this also seems unlikely 
        *d) near end of meeting, LB suggests that a small energy shift 
        in beam, say 30 keV (?) might explain it 
        > idea considered plausible, not totally crazy 
  o LB "flabbergasted" by the problem 
        - frustration that ops can't simply "dial-up" a good tune
  o ML suggests that integration time on CCD be adjusted to see if 
        beam spot image changes. 
        - perhaps usual 10s is too long
** ACTION ITEMS 
        - put together a plan to SYSTEMATICALLY INVESTIGATE problem 
        - talk to B. Laxdal about the tunes 
        - JR will look into elastic monitor to quantify problem 
6. LB would like a Ge detector tested with DRAGON 
  o Idea to get better energy resolution --> resolve cascades 
  o NONTRIVIAL hardware change required to put it into system 
        - needs peak-sensing ADCS (Selena?) for best resolution 
  o _much_ discussion about hwo to set this up, how long it will take 
        - talk of ~week (or more) to put it in and take it out 
  o suggestion that putting signal in a FERA (?) ADC would be 
        easier to set up. 
        - however, less resolution on this ADC 
  o JR suggests testing it out with source and PC-based analyzer first 
* ACTION ITEM 
        - go over after meeting (lunch) and look at setup, 
        see what can be done 
7. Safety meeting Wed Nov 5 morning to discuss DH report on 
        1.8 MeV/u max energy upgrade
8. TUDA requests gas handling stuff from ion chamber 
        o some bits actually owned by Oppenshaw 
        - should just buy one for DRAGON 
        o OK, as long as care taken (no "holes",leaks (DH)) 
* ACTION ITEM 
        - ML will take lead on this
9. MT reports on Geant3 separator simulation
  o varied Q1,Q2 in "standard" and JR "broad" tunes (see attached) 
  o old target geometry 
  o acceptance plateaus _not_ centred at 0% (see figures) 
  o working hard to get new geometry implemented in G3 
        - confusing and contradictory accounts of said geometry 
10. JDA presents idea to bring small Long Island cyclotron to TRIUMF
  o 17 MeV proton, 8 MeV deuteron machine. two beam lines. 
  o idea is to have an alternate source for e.g. 15O and other volatile isotopes 
production 
  o LI will "give" TRIUMF the cyclotron (apart from packing and 
        shipping costs 200k$ ??!) if TRIUMF asks for it _very soon_ 
        - comes with targets, power supplies, pumps, beam lines, magnets, 
etc..... 
  o JDA intends to submit an EEC proposal on "alternate source" idea 
        - use TR13 for proof-of-principle 
        - will approach Div. Heads with idea 
  o long discussion ensured on infrastructure, $$$ needed 
        - acknowledged that an operator type person will be required 
        - infrastructure support 'significant' 
        - likely >1year after delivery before operation (at least: DH) 
        - a room near hot cells  might be proposed to be used. Big, close enough 

  o perhaps bring it here and store it for a while ??

MEETING ADJOURNED 12:20
MMP head stops spinning 12:25