JLS Current Status

Date: 31 January 2008

TELESCOPE	Nothing to report.
HARP/ACSIS	The current status of HARP is summarised below: Receptor H03 is missing from the cryostat. Receptor H14 is currently unusable due to large oscillations in the mixer. Receptors H09 and H12 are operational but have high resistance in series with the junction. For H09, this resistance has been present since the instrument was delivered. For H12, its high resistance appeared after a scheduled warm up in September. An interim solution has been to increase the bias voltage on these receptors, with minimal effect on data quality. The dewar is showing temperature drifts which are affecting the performance of the mixers. The compressor and cold-head are suspected to be the cause - the latter may need to be replaced in April.
CALIBRATION	There have been variations in calibrations since December. Investigations are ongoing to determine the cause and resolution of these. Receptor-to-receptor gain variations have been reported whose cause are being investigated. These variations are frequency dependent (12CO tunings perform much better than 13CO, for instance).
PROGRESS	The January JLS observing block was observed at the beginning of the month. See the summit occupancy page for January 2008 to see who the observers were. There were a total of 84 hours available of which 40.6 hours were spent observing JLS. Specifically, 37 hours were spent observing for NGS and 3.4 hours for GBS. Quality assurance of this data by the teams is now needed. The observing seems to have gone smoothly. The weather was at times too good for the JLS projects and observations from the queue were executed. Some time (approximately 20 hours) was used in an effort to finally complete the HARP Guaranteed Time project. The next observing block, hosted by SLS, is due to start next week. 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 reference, the JLS allocations are given here.
ARCHIVED REPORTS	An archive of previous JLS status reports is accesible from the links below:

<back to JLS home>