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| '''8h30 UT:''' Andrea arrive to the 30m to cool down the NIKA cryostat and to prepare all the facilities for the polarisation run. | '''8h30 UT:''' Andrea arrives to the 30m to cool down the NIKA cryostat and to prepare all the facilities for the polarisation run. |
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| '''10h00 UT:''' Pumped the dilution circuit (until Jpi=2.2e-2mbar). Pumped the trap. | '''10h00 UT:''' Pumped the dilution circuit (until Jpi=2.2x10e-2mbar). Trap pumped. |
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'''20h15 UT:''' T4K=278K. Tstill=265K. Good night and good luck (to myself) == October 1st 2014 == '''STATUS OF THE INSTRUMENT''' Cooling down still going on. '''05h40 UT:''' T4K=90K. Tstill=75K. Flux set at 630mbar. '''07h00 UT:''' T4K=31K. Tstill=40K. Flux set at 530mbar. '''10h35 UT:''' T4K=25K. Tstill=31K. Flux set at 360mbar. '''14h45 UT:''' T4K=7.2K. Tstill=10.3K. Flux set at 300mbar. Since the still and the mixing chamber are cooling down slowly, we decide to pump directly from ev17. The slope is much better. |
Contents
September 30th 2014
8h30 UT: Andrea arrives to the 30m to cool down the NIKA cryostat and to prepare all the facilities for the polarisation run.
STATUS OF THE INSTRUMENT
9h00 UT: Status of the Camera pulse tube : J1=96.3mbar - J2=329.8mbar - J3=297.3mbar - J4=160mbar - J5=350mbar
09h30 UT: Cryostat connected to the leak detector. Residual pressure in the cryostat 16mbar.
10h00 UT: Pumped the dilution circuit (until Jpi=2.2x10e-2mbar). Trap pumped.
11h UT: Pressions stables. The zero on J1 was -41mbar. Reset it again to 0mbar by changing the config file.
11h30 UT: M5 and M6 mounted. Optical alignment of the cryostat with Santiago, OK. LUNCH TIME.
12h30 UT: First Leak test. From 3x10e-9 to 2x10e-8, little scary, I'll do it again before switching on the pulse tube.
13h00 UT: Warm impedance test: between 18 and 20mbar/min at 2.9bar (ev1 closed). Consistent with the last cooling down.
13h15 UT: Circulation throught the capillar starts.
14h00 UT. Pumped ev18 for a few minutes with the turbo pump (down to 2e-4mbar). We had 0.2mbar in ev18. REMEMBER NOT TO TOUCH AGAIN ev18 from now on.
15h45 UT. Second Leak test. From 9.3x10e-9 to 2.5x10e-8. LET'S CONTINUE!
16h30 UT. Pulse Tube on. Low pressure and High pressure OK. Mixture circulates at 2.95bar (J4) and 950mbar (J2 with preref on).
20h05 UT: Lowering to 850mbar. Keep this value for the night.
20h15 UT: T4K=278K. Tstill=265K. Good night and good luck (to myself)
October 1st 2014
STATUS OF THE INSTRUMENT
Cooling down still going on.
05h40 UT: T4K=90K. Tstill=75K. Flux set at 630mbar.
07h00 UT: T4K=31K. Tstill=40K. Flux set at 530mbar.
10h35 UT: T4K=25K. Tstill=31K. Flux set at 360mbar.
14h45 UT: T4K=7.2K. Tstill=10.3K. Flux set at 300mbar. Since the still and the mixing chamber are cooling down slowly, we decide to pump directly from ev17. The slope is much better.