Overall status: B configuration (dipole installation 26 Apr (after this no L/S-band polarimetry)). CBE issues may be resolved! Correlator hw resources support up to 56 BlBprs (that many sub-bands or use for additional resolution).
Ongoing work with alerts (will lead to improved flagging); rolling forward and back on CBE as needed. OPT 1.09 coming at the end of the month (see AOB).
CASA Update (new functionality available/issues/enhancements):Notes (Miriam): Bug fixes for release; hoping for next week; currently there are more resolved than created JIRA tickets; new stable today.
AIPS Update (new functionality available/issues/enhancements): Notes (Eric): NOIFS was mis-scaling maps; fixed. IM2CC (can take a model image from CASA and break it up into facets and make a CC file - used for comparing wide field imaging algs); improvements in FARS user interface.
NOTE: Please cc me on submitted tests so that it can be assigned the appropriate priority!
Commissioning priorities for the week (McMullin, Chandler)
Double maintenance day week:
Mon
1200-1700: Testing/software development time
1800-0930: Science operations and testing
Tue:
1200-1700 Testing/software development time
1800-0900: Science operations and testing
Wed: Maintenance day
0900-1700: Maintenance operations
1800-0900: Science operations and testing
Thu, Fri (to be negotiated for additional observing time):
0900-1700: Testing/software development time
1800-0900: Science operations and testing
Sat-Sun
Science operations + planned testing
Issues Affecting Science Observing:
Correlator: Missing/lost scans in data sets. May be related to overall issues with CBE; major focus
Correlator: fshift sub-band anti-aliasing causing phantom spectral lines when using recirculation for narrow bands (only worry if Michael has to prep your file).
Correlator: time mislabeling in SDM data (non-synchronous operation between correlator dumps and CBE can require additional 1/2 integration time padding for online flags);Update from last week; no further work due to other CBE issues; will resume once this is solved.
Array/Construction: Frequency offset tests (Dhawan/Rupen). Update: The pattern suggests that crossing 32 MHz (one of the discontinuities in the L302 tuning plan) leads to the phase jumps. No explanation for the magnitude of the phase jump is offered here (~120 degrees). Switches from 2 other vendors have been ordered and will be tested soon.
Correlator: Delay rocking across bands. Implementation pending factor-of-2 reconciliation.
Array: Amplitude wobbles seen on subset of antennas; phase jumps at scan boundaries also seen on subset of antennas (Ka, Q bands only thus far).
Array: Zoo of other effects (some data are very good, some still seeing antenna-based IF/Polarization issue).
Testing This week
Correlator: Pokorny: CBE
Correlator: Momjian: Zeeman testing
Correlator: Rupen: S-band shadow testing
Correlator: *; L-band SEFD confirmation
Spectral line: Momjian: HI High resolution bandpass testing
Notes: Amy began testing last week with Michael trying to replicate previous installed system; not quite there. 1/3 of antennas phased up (applied the correct phasing output), some phased to some value other than zero.