Minutes from target meeting held May 13 2011 in 892-2-009

These minutes are available also from:

http://wwwcompass.cern.ch/compass/detector/target/Minutes/2011/

a) Reconnect water pipes to the helium-3 roots heat exchangers on Monday.
The broken plastic water flow spinners replaced with new ones. New
water flow system set up. The system includes an adjustable 
pressure regulator, an overpressure valve at +6 bar and a control valve
for the flow. First test on the repaired roots pumps were done at +0.6 bar 
water inlet pressure. Also the outlet pressure can be monitored with a 
pressure gauge. Two water leaks on the copper pipes were fixed with soft 
soldering. The flow regulation valves after the spinners were checked 
and used to get air out from the water circuit.

b) Leak test and cool down helium-3 circuit LN2 trap on Tuesday. Start
helium-3 roots and pump the outlet with a leak detector through the LN2
trap. Spray helium on the different o-rings in the roots blowers. No helium
leaks observed.

c) On Thursday fill the mixing chamber and helium-3 roots with helium gas
to atmospheric pressure. Drain the oil from each of the pump and fill in
new oil to the gear boxes.

d) Fabrice: magnet precooling with LN2 started on Wednesday. Set small
helium flow into the magnet LHe vessel to compensate pressure drop due
to cooling down. 

e) Thermometers cables were connected to the target holder. LabVIEW can now
read the diode thermometers and send the data to the COMPASS DCS system.

f) Magnet cryogenic monitoring PC that is used to program also the PLC
failed again 3 weeks after changing the power supply. New PC ordered.

g) Yuri: test new thermocouple type microwave power meter. Calibration
can be checked by comparing to the old model.

h) Hiroki: install new cable from the control room to the platform for
an ultrasonic motor microwave attenuator control.

i) Cold cathode isolation vacuum gauge on the top of the dilution cryostat
probably broken.