Minutes of the DRAGON group meeting of March 26, 2008
   held at 9:30am in the High Energy Counting Room of ISAC-1
------------------------------------------------------------
(Note: the regular Tuesday meeting was postponed because of conflict with 
presentations to the Special EEC meeting.)

Present: CR, DH (recorder), CV, UH, LE, DO, PM

1. Vacuum at the End Station
	-the large electrostatic mirror assembly was mounted in the Final 
slit box.  Over the Easter weekend the vacuum got no better than the 
mid-to-low 10^-6 Torr range (CV).  No leak was present according to the 
He leak detector (DO/DH).
	-the mirror and actuator were removed and its port blanked off.  
After 3 hours IG52 had broken below 1E-6 Torr and after 18 hours had 
reached 3.8E-7 Torr.
	-the changes were: removal of the actuator bellows (but a leak 
here should have shown up in the leak test?); removal of the mirror, which 
has G10 parts.  Literature says G10 takes a long time to outgas, so this 
is the most likely culprit.
	-Machine Shop has trouble making the Ion Chamber Pickup Flange 
from Al, will begin to make it from st.steel within 1-2 days  (CV)

2. Actuator for the large MCP/mirror/foil
	-if we use an available air cylinder, it will need a short spacer 
in order to get the mirror assembly far enough up in the Out position.  
DO is concerned that because air is a compressible fluid, any tendency to 
stick will lead to Stick-and-Jump motion with destruction of the thin 
foil.
	-the motor drive from the previous Foil actuator is available, but 
would need a bare shaft to be docked and an adapter welded on its end.

Priorities:
	#1 implement the motor drive as MCP actuator (DO/PM/CV)
	#2 have Controls fix EPICS interlocks, displays (CR)
	#3a re-mount mirror and observe pump-down for up to 1 week 
	#3b attach 'tree', including new turbo, to IV61 port (DO)
	#4 assemble and mount multi-mesh beam attenuator (DO/CR) 

3. DAQ
	-priority is to have electronics for Ion Chamber and MCP's set up 
in time for May test beam.  Need to recover 5 switchable delays for the IC
	-this week can generate test signals to compare the New Analyzer 
vs the previous analyzer or vs Nova (LE/CV)
	-need to do a demo of BGO gain calibration when the missing 
library for HV script is provided (LE/CV to contact Konstantin O.)
	-for 23Mg beam need the beta monitors and Ge mounted and connected 
to electronics.  DH will check connections to "Operations" EPICS scalers.

4. MCP foils
	- CV and LE spent 3 hours yesterday trying to pick up large, thin 
foils.  Release from the slide onto water is not a problem, but pickup 
onto a mesh is tricky.  More practice is needed.

5. Supernanogan
	-CR has warned W-P Liu and Anuj Parikh of the possibility 
that Supernanogan will not have been commissioned by the time it is 
supposed to deliver a 33S beam to us in August.  The run will be shown on 
the schedule and pressure kept on to get it commissioned in time.

6. 22Na(p,g) experiment
	-Anne S. has tried cleaning the target ladder that held the 22Na 
targets shipped from TRIUMF to Seattle, but activity remains.  They will 
make a new ladder and send it to TRIUMF, rather than deal with issues of 
shipping an active ladder.
	-date of run with 22Na target has not yet been set.