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Contents

September 30th 2014
October 1st 2014

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

Cooling down still going on. Tests on acquisition software going on. We found few problems still to be fixed. Lots of e-mails and skype conversations between IRAM and Cardiff. The status is resumed in the STATUS OF THE POLARISATION FACILITIES

STATUS OF THE INSTRUMENT

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

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-  ⇤ ← Revision 4 as of 2014-09-30 14:00:56 → 
  Size: 282
  Editor: NikaBolometer
  Comment:
+   ← Revision 33 as of 2014-10-01 20:52:00 → ⇥
  Size: 2794
  Editor: NikaBolometer
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
-== 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) -18mbar/min; on J1 (J4=3000mbar, ev1 closed) +2.5mbar/min.
+<<TableOfContents(3)>>

== 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 ==

Cooling down still going on. Tests on acquisition software going on. We found few problems still to be fixed. Lots of e-mails and skype conversations between IRAM and Cardiff. The status is resumed in the '''STATUS OF THE POLARISATION FACILITIES'''



'''STATUS OF THE INSTRUMENT'''


'''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'''


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