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| TELESCOPE |
There are no problems to report. From next week (May 12) the telescope will be shutdown for two weeks for SCUBA-2 integration work, opening again for eSMA commissioning on May 26. |
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| SCUBA-2 |
Work on the SCUBA-2 instrument has gone well. The instrument was assembled and is now being pumped down and tested for leaks. During the upcoming shutdown period, the instrument will undergo final optical alignment before being cooled down. By early June, SCUBA-2 will be at its operational temperature. |
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| HARP/ACSIS |
The current status of HARP/ACSIS is summarised below:
- H03: missing from the cryostat since delivery.
- H14: currently unusable due to large oscillations in the mixer. This receptor has now been switched off in the data acquisition.
- Receptors H09 and H12 are operational but have high resistance in series with the junction.
- The performance of H09 has continued to deteriorate, especially at low frequencies, with the intermittent appearance of interference spikes in the spectra.
Because of these problems, data from receptor H09 below 340 GHz are now masked out by the pipeline processing (note that they are still in the original time-series spectra).
Since the cold-head was replaced during the April shutdown, the performance of HARP has improved. It is now consistently holding its temperature and the dewar is at its specified temperature. This seems to have had a beneficial effect on the data quality.
Despite this, the situation with the receptor bias settings previously reported is still present. Work continues in establishing the optimal bias settings for each receptor across the B-band frequency range.
A real solution to this problem is being investigated by colleagues at MRAO (work on this should start in May).
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| CALIBRATION |
No change from previous reports, although as mentioned above the performance of the HARP receptors has improved since the cold head was replaced.
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| JLS PROGRESS |
The April JLS observing block was hosted by the NGS. See the summit occupancy page to see who the observers were.
Unfortunately the team were plagued by the weather and less than 4 hours of data could be observed on the JLS from the 60 that were available. We thank Jamie and Boon for coming out and supporting the run nonetheless.
The current progress is shown in the bar charts below, illustrating the amount of time charged to each survey and the current completion rate (for just the HARP survey components). The NGS team have done a lot of their quality assurance (QA) manually and this is reflected in the bar chart - they are currently 87% complete.
The JDUG have reviewed and approved a document developed by members of the GBS team (based originally on a NGS document) to perform QA tasks within the summit pipeline. Coding this into the pipeline has begun.
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For reference, the JLS allocations are given here.
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| ARCHIVED REPORTS |
An archive of previous JLS status reports is accesible from the links below: |
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