Minutes, May 29, 2007 Weekly meeting
Taken by MJ
Meeting starts: 2:00

Mitutoyo
DO:
-Making progress but not working yet.
-Process of calibration  is different.
-Not in correct place, but no reason (presumably) that it can't be moved there.
-Might have to recalibrate in epics (outer limit switch has moved - new reference point).
-Recalibrating will be a major undertaking (via sighting?), but may need to be done 
before energy measurements can be made.
CR:
-Needs to be properly calibrated before used to measure energies (for alpha testing as 
well).
DO:
-Unit is not absolute, so we need an absolute reference point and need to disable the 
zeroing function.  Also the new Mitutoyo requires a mounting system which the old ones 
did not.

Shipment to Seattle
DO:
-Packaged
-Can't find address - CR will reprint address. 
-Radiation safety wants to re-survey pump and valve (since they found 1220 counts/s 
on cryo previously, mix of several elements - some long lived)
PM:
-The radiation is 'loose' but sticky
-wash, replace ring, seal (clamped lid)
DH:
-What are the regulations on shipping contaminated material? - needs looking into

DSSSD electronics
CR:
-took two days to re-cable
-hopefully it will take less time now that everything is labeled
-maybe add the diagram to the operator notes on the web (by AG or MJ?)

TOTAL station
MJ:
-Things look good
-some errors in calculations (now fixed by DH)
-some inconsistencies (DH has measured by hand and corrected)
-A few changes, most make sense but some are harder to explain
-Data passes most logical first-tests
-Accurate and precise to the level we need
DH:
-Not actually very many changes
-No angles changed
-Some lengths extended to match reality (some adjustments may still be necessary)
-Most changes typically around 5mm
-MJ will write up a report
-Notes on the data
-Some along axis shift may be necessary
-Q4 looks rolled
-The optic axis seems to run downhill approx. 4mm over sep. length?
-Perhaps simulations may need adjusting to include differing lengths?


Alpha tests
CR:
-Detector is set up and calibrated
-Ready to adjust the mysql to reset the gains
-Waiting on slits (Mitutoyo) before starting (slits are open for tests, but don't 
want to interrupt the test)


Back to Mitutoyo
DO:
-Can rush it
-Need help from someone who knows epics (for re-zeroing)
-This time tomorrow should be working


Alpha tests cont'
CR:
-Using the same limits Jonty used to verify his (and CR's) results
-Then start adjusting/testing the second stage to see how things can be optimized
-Would like some optics calculations so it's not just blind guessing


SIMION
CR:
-Chris has 'finished' program in raytrace to map the MD fields (slices)
-You can only use one coordinate system to import into SIMION, so the fringe fields 
do not lie along axes, so the step sizes are skewed transversing the fringing fields
-Need a small step size
-1/3 of magnet gap for differential step is recommended and seems to work best
-Using that step size, things seem workable
AG:
-For importing into SIMION you need to write some code that SIMION reads
-It's unclear about whether the code or SIMION does the interpolating
-It is a nontrivial task that will probably take a while

Solar cells
CR:
-Cables half the length of the longest sections, with ribbon connectors to provide a 
possible extension
-This avoids bunching in vacuum
-Need to think about feed-through
-Final design should be ready soon to have things made

Mylar windows
-Check with Christof

Other:
DH:
-Request brief after-meeting meeting about vibrating wire, in hope of being ready to 
go for July

DO:
-4:00 meeting to sort out Mitutoyo
-Count steps as a means of zeroing
-Redefine zero using steps in epics

Meeting ends 2:45