Minutes from target meeting held February 1 2013 in 892-2-009

These minutes are available also from:

http://wwwcompass.cern.ch/compass/detector/target/Minutes/2013/

a) Modification of the target loading platform for the Drell-Yan setup was 
discussed. In the present plans the loading platform needs to be shortened 
by 100 cm. The limited space could make the craining of the loading platform
more difficult than before. It might be impossible to unmount the dilution 
cryostat from the magnet due to limited space at upstream of the target 
platform and no access available to the downstream flange of the magnet.

b) Norihiro: plan to move the microwave table one meter upstream inside
the control room. A new rack for the microwave power supplies could be 
installed. The microwave guides should go straight through the concrete
wall from the microwave table with only bending them down to pass the 
guides under the false floor. The cooling water supply lines should stay
at the present position.

c) Kaori: move the PXI crate for the NMR to the control room (now on Saleve
side concrete wall). Longer PXI cable needed than what is in use now. 

d) Kaori: microwave PSU from CPI expected in mid March. Needs to be tested
in the control room.

e) Microwave generator security interlock was discussed in case of a remote
operation. Remote switching off could be implemented with the Siemens PLC.
Now the PLC switches off the generators if the temperature at the EIO tube
waveguide becomes too high. Also the possibility to switch off by going first
to the standby mode was discussed.

f) Jaakko: test reading of AVS46 and LakeShore 218 using with GPIB bus with
Perl scripts. Now the device reading and database writing latencies can 
be seen online. See http://wwwcompass.cern.ch/elog/target_polar/184

g) The needs for access to the target platform during the Drell-Yan data 
taking were discussed. The LHe dewar could need to be checked sometimes
by the cryogroup. The diffusion pump below the platform might need some
intervention (pressurized air and water). The servo motor for the microwave
attenuator did not work always very reliably in the run 2011. The cavity
needle valve had to be operated manually and was thus broken. The NMR rack
needs water cooling and the initial tuning of the Q-meter boxes. The tape
and air heaters might need to be readjusted. Sometimes it is necessary
to melt a block of ice with a heat gun.