Minutes of DRAGON meeting January 30, 2007

Present: CD, MT, DO, DH (recorder), LB, PM, CR, CV, MP

1. Minutes of previous meeting and business arising
        o no corrections
        o gate valve IV61 is in the hands of Vacuum group who will
        fix it when they have time.  Meanwhile we have an old but
        leak-tight valve on loan.
        o XIA: PC support group is working on getting the software
        going (Windows 2000, S/P2 the only viable platform?)

2. Acceptance study  CR, DO, et al.
        o we begin by installing the Si strip detector in a small box
        just upstream of the Final slit box, at the location where
        normally there is a 4" bellows as a limiting aperture
        o some last-minute snags in getting the DSSSD ribbon cable
        to allow full detector motion in one direction.  Solution
        may be to rotate 180 degrees so ribbon-cable side of DSSSD
        is opposite the vacuum feed-through instead of beside it.
        This creates a problem with a ledge on the Cu mounting/cooling
        block--concerns about electrical insulation or crunching the
        delicate wires of the DSSSD.  A party of 5 to make a site visit
        after the meeting.
        o JP is willing to show how the alpha source was mounted in
        previous alpha measurements.
        o the DSSSD mounting stage adjustment screws will be calibrated
        for -2", 0" and +2"; we can go farther if need be.
        o should be ready to assemble and pump down by tomorrow
        o CV will check the MCP now, while it is vented to atmosphere

3.  20Ne(p,g)21Na run of November 2006  MT
        o re-examining yields on the plateau; online calculations of
        yield were inconsistent (15-20% spread)
        o online wg calculated to be higher than literature and our
        measurement of 2002
        o 2 runs runs with 18% online yield difference were re-analyzed
        with consistent cuts on recoil singles spectrum; get a ratio of
        yields 1.07 +/- 0.03 which is still somewhat troublesome.
        o will continue analyzing more runs and looking at other
        features of the data (e.g. CCD intensity).

4. Other business
        o solar cell project (REA-747): Brian Evans has test soldered a
        cell in place -- no damage ("solderable cells").
        Awaiting a quote on price of cells.
        o Annual Report 2006 contribution for DRAGON facility was
        submitted today; 40Ca(a,g) contribution will be closer to
        February 15 deadline.
        o budget request for "TRIUMF DRAGON" account was submitted
        yesterday by CR
        o for next week: 20Ne(p,g); 40Ca(a,g) analysis

Meeting ended at 14:35