DRAGON meeting 9 Dec 2008

present: DO, DH, CR, LB, PM, UH (rec)

* power down
 - all biases are switched off
 - all NIM crates on the heavy ion side are off
 - all optics except for the EDs are off
 - cryos and turbos are off
 - gas target off
 - IC under vacuum but not pumped

* EPICS problem
 - elements on optics page 2 could not be turned off using EPICS

* BCM2 problem
 - lower left plate reads lower current for centred beam

* Na21 run
 - beam was tuned through to ED1
 - ED1 could not be brought up to the required voltage for charge state 10
 - beam was centred manually on the mass slits to match the recoil position
 - runs were taken with ED1 at nominal value, and ED1 at +/- 1%
 - results overview:

Run#    ED1     FC4 (epA)   FCCH    Time     NaICts     HPGeCts     Live     NaIEff           HPGeEff
-----------------------------------------------------------------------------------------------------
19668	0%	183+/-2	    14+/-1  692	     1855	N/A	    0.96     (3.2+/-0.3)e-7    N/A
19669	-1%	167+/-4	    14+/-1  472	     1319	N/A	    0.97     (3.4+/-0.2)e-7    N/A
19670	+1%	167+/-1	    13+/-1  685	     2427	2856	    0.99     (4.5+/-0.3)e-7    (2.7+/-0.2)e-4
19671	0%	169+/-1	    14+/-1  685	     1984	2832	    0.99     (3.3+/-0.2)e-7    (2.4+/-0.1)e-4

 - +1% has the highest NaI efficiency
 - DH found the NaI/S7 ratio to be consistent
 - getting an absolute efficiency for S7 would be difficult and is not necessary

* dragonroot
 - was compiled on trcomp but does not run
 - problems with root and rootana versions
 - needs cleaning up, GR will look into it

* Na22
 - DO, CR met with Collin, Jow Mildenberger and Friedhelm
 - an oxygen percentage meter will be needed
 - controlled access for target change
 - a camera has been installed
 - current integrator is implemented in DRAGON EPICS under diagnostics: Integrator ILTIOC, the current is resent when the IOC is restarted -> take regular notes of current
 - attach current source to the Faraday cup cable to check the integrator