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| === Prep Sun 12/05 === Left Grenoble by car in the morning, stopped at Calp |
[[NikaRun6|Back to the NIKA run6 page]] |
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| === Prep Mon 13/05 === Arrived at the telescope around 3:30pm. Unloaded the car, installed archeops8, archeops9 and THz in the control room. Updated with SVN. Experiment file for next NIKA run: nika_iram2.txt |
[[PrepRun6|Go to preparation run daily reports]] Preparation visit before Run6 [[NikaRun6|Back to the NIKA run 6]] === Daily Reports === === Mon 03/06 === Left Grenoble by car in the morning. Andrea, Alain, Alessandro. Reached the telescope at 20h30. === Tue 04/06 === During the maintenance craned up again NIKA, installed. '''Warm impedance test: 20mbar/min at 3 bar''' Start cooling down at 13h30. Test with VNA at 300K: {{attachment:VNA_1mm.jpg||width=600}} {{attachment:VNA_2mm.jpg||width=600}} ''Figures: VNA scans at 300K (0-8GHz). Left: 1mm array; right: 2mm array.'' Installed the electronics with the cables. {{attachment:nika_back_1.jpg||width=600}} {{attachment:NIKA_back_2.jpg||width=600}} ''Figures: NIKA installed again.'' We have also visited the back of the antenna and in particular the receivers cabin roof for possible installation of the NIKA-2 electronics. Space available is 80cm (H) x 200cm (Width) x 100cm (Depth). In order to have enough space to work, we will use a maximum depth of 60cm. The total COAX cables length if this solution is chosen is 6-8m. {{attachment:roof2.jpg||width=600}} ''Figures: Cabin top, possible place for NIKA-2 electronics.'' '''Cryostat temperatures at 18h (T0 + 4h30). 4K: 255K (14K/h slope); Still: 235K (25K/h slope); R_BM: 1011 Ohm.''' The 4K is slower compared to the last Grenoble runs. We have checked the PT compressor pressures and they're OK: high=28.5bar; low=10bar. So we haven't lost helium. At 18h20 we reduce a bit the preref flux (from 1000mbar to 900mbar) to see if the 4K was affected (it shouldn't in principle). Actually YES, the 4K accelerated and the still slowed down a bit. '''Cryostat temperatures at 20h30 (T0 + 7h). 4K: 207K (20K/h slope); Still: 165K (27K/h slope); R_BM: 1020 Ohm.''' '''Cryostat temperatures at 22h30 (T0 + 9h). 4K: 164K (20K/h slope); Still: 115K (22K/h slope); R_BM: 1026 Ohm.''' === Wed 05/06 === Cooling a bit slower than last time in Grenoble but still comparable. Hopes for condensation start in the morning. Pressures in the PT compressor: 27bar (high); 10bar (low). '''Cryostat temperatures at 9h30 (T0 + 20h). 4K: 6.5K (0.4K/h slope); Still: 9.2K (4K/h slope); R_BM: 1190 Ohm (10.3K).''' |
Go to preparation run daily reports
Preparation visit before Run6
Daily Reports
Mon 03/06
Left Grenoble by car in the morning. Andrea, Alain, Alessandro. Reached the telescope at 20h30.
Tue 04/06
During the maintenance craned up again NIKA, installed. Warm impedance test: 20mbar/min at 3 bar
Start cooling down at 13h30.
Test with VNA at 300K:
Figures: VNA scans at 300K (0-8GHz). Left: 1mm array; right: 2mm array.
Installed the electronics with the cables.
Figures: NIKA installed again.
We have also visited the back of the antenna and in particular the receivers cabin roof for possible installation of the NIKA-2 electronics. Space available is 80cm (H) x 200cm (Width) x 100cm (Depth). In order to have enough space to work, we will use a maximum depth of 60cm. The total COAX cables length if this solution is chosen is 6-8m.
Figures: Cabin top, possible place for NIKA-2 electronics.
Cryostat temperatures at 18h (T0 + 4h30). 4K: 255K (14K/h slope); Still: 235K (25K/h slope); R_BM: 1011 Ohm.
The 4K is slower compared to the last Grenoble runs. We have checked the PT compressor pressures and they're OK: high=28.5bar; low=10bar. So we haven't lost helium. At 18h20 we reduce a bit the preref flux (from 1000mbar to 900mbar) to see if the 4K was affected (it shouldn't in principle). Actually YES, the 4K accelerated and the still slowed down a bit.
Cryostat temperatures at 20h30 (T0 + 7h). 4K: 207K (20K/h slope); Still: 165K (27K/h slope); R_BM: 1020 Ohm.
Cryostat temperatures at 22h30 (T0 + 9h). 4K: 164K (20K/h slope); Still: 115K (22K/h slope); R_BM: 1026 Ohm.
Wed 05/06
Cooling a bit slower than last time in Grenoble but still comparable. Hopes for condensation start in the morning. Pressures in the PT compressor: 27bar (high); 10bar (low).
Cryostat temperatures at 9h30 (T0 + 20h). 4K: 6.5K (0.4K/h slope); Still: 9.2K (4K/h slope); R_BM: 1190 Ohm (10.3K).