Minutes of DRAGON Group meeting, 6 August, 2002

Present: L.Buchmann, J. D'Auria, M. Chatterjee, J.Fallis, D. Gigliotti, 
         D. Hutcheon, C. Jewett, A. Laird (recorder), M. Lamey, J. Rogers,
	 C. Wrede


1. Minutes of the previous meeting adopted with the following revisions:
   - in those listed present Suzzi Lapi should be Suzi Lapi
   - under the second bullet point, it should read Cary Davids
   - under the fourth bullet point, add that the eurocrate was powered
     down

Business Arising

2. JDA reported that the DSSSD had been destroyed.  DRAGON was running
   with attenuated beam and the voltmeter was being watched.  However,
   the Eurocrate had been unplugged and so there was no reading.
   Attenuated not full beam was on the detector for several minutes.
   The DSSSD then exhibited high leakage currents.

3. JDA agreed to order 2 new detectors.

4. JDA has contacted Cary Davids about material for the IC from
   Argonne and is waiting for a reply.

Up coming run

5. CJ reported that 21Ne is preferable to 20Ne due to the presence
   of more resonances and that it was suggested that we start with
   the 510.2 kev/u resonance.

6. DAH reported that currently the trigger signal from the IC is taken
   from anode 1 and asked if there was any reason to change this.  CJ
   reported that AC had wanted to use anode 3 to avoid triggering on
   'trash'.  LB stated that the expected rates are low enough for this
   not to be a problem and we should record everything.  DAH inquired
   what the chance of anode 1 missing real events is?

7. JR suggested checking the DA for the IC by using an alpha source.
   DAH suggested pulsing the grid.  JR warned that the discriminator
   levels should be checked so we are not missing events.

8. DAH suggested the need for a training course on filling the IC.

9. JF reported that the MCP shows good position information but the 
   timing is questionable.

10. DAH reported that NOVA can be used to look at the MCP data, the
    DSSSD should be removed from NOVA and the IC inserted.

11. LB suggested mounting the alpha source on the back of FCF.

12. JDA reported that EPICS is not up to date on the hardware side.

13. JDA reported that the thick windows are currently on the IC
    and we should work out procedures before replacing them with
    thin windows. 

14. JDA suggested adding the 730 kev resonance to the list since
    it is broad and all those currently on the list are narrow.

15. DAH reported that George Mackenzie was interested in Prague
    magnet calibrations.  JR added that we should use this run
    to check the calibration of the elastic monitor since we need
    to recover the ability to measure beam energy and width from
    the elastic data.  DAH suggested that we focus on the IC.

16. JDA reported a problem with the cryo pumps.  ED2 is now ok\
    and ED1 should be ready in a few hours.

17. JDA reported that the dry pumps exhibit a low grinding noise.
    This is not critical and there are backups.

18. DAH reported that RP should be turned off when not in use.

19. DAH reported that there is a drip from quads 3 and 5 and 
    it is not critical.

20. DAH reported that the plexiglass shields had been removed 
    from Q1 and Q2 and that this was not safe practice.


Miscellaneous

21. JDA reported that a fume hood was being added at TR13 for
    Suzi's work.

22. DAH reported on discussions with David Jenkins on the intention
    together with Brian Fulton to measure 12C+12C with DRAGON.
    DG has undertaken some simulations on this using GEANT.  There
    was interest expressed in this measurement.

23. CW reported on the status of the SSD's - 3 fried, 2 broken
    wires and one single sided ok.

24. CW reported on new design for SSD holder including cooling.
    The leakage current dropped by an order of magnitude with
    cooling but the resolution was not improved.

25. CW stressed that the SSD have extremely fragile wires and
    great care should be taken in handling them.  JR added that
    gloves should be worn.

26. DG reported that the trays for moving the BGO array run
    extremely smoothly and any resistance indicates a problem.