DRAGON group minutes 10 Jun 2008

Present: CV, CR, DO, DH, LB, LE, SF, PM, PB, UH (rec)

Run E810:
* lost BGO coincidences
 - The signal from the BGOs was 10 ns long, it should be longer. It has know been changed to 300 ns.
   With this signal, in a background run with random coincidences 17 out of 238000 coincidences were lost.
 - A pulser could be used during the run to check for lost coincidences. The pulser signal should go into the scaler and both triggers.
* IC window
 - There have been problems with leaking windows. New windows were glued with a fresh batch of fresh epoxy, and seem to be tight.
 - The IC window possibly charges up during a run causing small discharges. A possible solution would be to coat the window with aluminium. CV will look into that.
* MCP foils:
 - There is a spare foil for MCP1 (large foil) stored on top of MD2
 - A spare foil for MCP0 will have to be floated (CV, UH, LE)
* offline analysis:
 - The analysis will be done in DragonRoot and carpere
 - carpere supports the fit functions built into Root
* efficiency of the MCP-IC setup
 - The transmission of the MCP foils was measured to be 78%, which is close to the calculated 77%
* Ge detector
 - The Ge detector has been set up and cooled down.
 - The fill cycle is 3-4 days, SF will keep track of it and keep it cooled.
 - Calibrations will be done with various sources. The relevant energy range is ~400-500 keV
* NaI detectors
 - The NaI detectors are fixed in position.
 - The calibration was done with 22Na. The efficiency is ~0.22%
* attenuator
 - The attenuator was not centred during the last run, which probably affected the transmission.
 - A factor 100 attenuation was added. The attenuator is now back in place.
* elastic monitor
 - SB0 showed strange spectra during the last run. It was tested in a dark box and found to be ok.
 - The cables should be checked.
* gas target
 - The gas target is in place, the right appertures are in, the roots are running.
* BGOs
 - The BGO calibration will be done when cooled down.
 - A second temperature gauge should be installed in the DRAGON area
* GEANT
 - CR is writing an input file with all the relevant levels and branching ratios.
   He will also put some instructions on the web.
* run plan
 The E810 run plan can be found under http://dragon.triumf.ca/runplan.html
* Q1/Q2 alignment
 The quads might be moved again, using the stable beam transmission as control.
 The dial gauges would be needed for that.

Logbooks:
 - The DRAGON elog is for analysis etc.
 - Paper logs should be kept to write down what you do as you do it.
 - These notes should then be put into the MIDAS logbook

Na22:
 - CR asked permission from remote handling to use the fume hood, it will be set up for Wednesday morning
 - The Ortec 672 has arrived and will be send to Seattle.

AOB:
 - CR submitted a stage 2 proposal for 18F(p,g) as the required intensity was reached during the recent TUDA run.