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| == Tuesday 30th September 2014 == | [[NikaRun9|Back to the NIKA run 9]] |
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| '''16h00.''' Alessandro (remote). Checked J5 in the last run: was 351 mbar. Today Andrea has measured J5=350mbar. OK, the 3He is still there. Mixture fluxes are still: on J4 (3000mbar) -20mbar/min; on J1 (J4=3000mbar, ev1 closed) +2.5mbar/min. Like last time (run 7, 14/01/2014). OK. | <<TableOfContents(2)>> == 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. '''17h35 UT:''' T4K=5.6K. Tstill=4.74K, R_BM=1.315kOhm Flux at 172mbar. '''Condensation Started'''. '''STATUS OF THE POLARISATION FACILITIES''' |
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.
17h35 UT: T4K=5.6K. Tstill=4.74K, R_BM=1.315kOhm Flux at 172mbar. Condensation Started.
STATUS OF THE POLARISATION FACILITIES