Minutes of DRAGON Meeting of March 4, 2003

Present: Joel Rogers(JR),Dave Hutcheon(DH),John D'Auria(JDA),Chris Wrede(CW),Sabine Engel(SE),Cybele
Jewett(CJ),Art Olin(AO), Lothar Buchmann,Dave Ottewell(DO),Catherine Neish(CN),Aaron Bebington(AB),
Dario Gigliotti(DG)recorder

1)Previous Minutes
  -no corrections
2) Hardware

a)(DH) Reports have been written for the new Q9, Q10 power supplies. See 
the web page. Also a saved file has been created, with the appropriate 
values, for the scaling program. This file does not include correct values 
for ED1 and ED2

b)(DH) A drawing for the solid carbon, "chain drive" target has been 
drawn by the design office. The design includes the following: 
-material obstructing gammas has been reduced 
-motor drive present. 
-switch exists to reset position of targets in case of software problems or power outage 
-pumping will be done through the beam line apertures, and through the turbos for roughing 
-chain drive is on a ~8 week delivery time 
-~3 month completion date on the target 

See attached diagrams for further details

c)(AL) Faraday cups 
-FC1 and FCCH have working current integration in place, FC4 does not as of yet

d)(DH) Profile monitor 
-motor drive tested and hooked up but not yet useable

3)Beam Related 
- (JDA) Suggestions for upcoming beam time scheduling were 
presented. C12 will be available today(?) and all April; IC 
chamber should then be installed, O16 next week. No weekends will 
be run in March. Days will be 16 hours.
-(AB) A departure from the trend in ion energy versus pulse position found in 
runs 6500-7000 was found to be due to a difference in gains and 
offsets for DSSSD settings. After a adjustment to these parameters 
was made to correct for the difference these runs followed the 
previous trends.  See attached figures for more details.

4)(JR) DAQ Hardware=-Deadtime Correction and Threshold Test 
-reported that 0.5 MeV separation between hardware and software 
thresholds is sufficient for doing analysis 
-deadtime will vary depending on if you are looking at gamma or HI 
singles 
-90% livetime at a count rate of 4K/s 
-80% livetime at a count rate of 10K/s 
-there was a change to the electronics which shortens the pulses 
to the gammaTDC, which reduces event length and therefore reduces 
deadtime.
-change in odb to change the HI "wait time" 
-see attached figures for more details

5)(CN)Demonstration of CCD camera 
-see www.triumf.ca/dragon/CCD_instructions.html

6)(AO)Demonstation of "new" DRAGON DAQ 
-see "local resources" link on www.triumf.ca/dragon