Overall status: B configuration (dipole installation 26 Apr (after this no L/S-band polarimetry)). Ongoing issues with operational stability of CBE - it continues to be the focus of testing. Correlator hw resources support up to 56 BlBprs (that many sub-bands or use for additional resolution). Update to RSRO recommendations.
Notes (Rupen/Sowinski): Ken away for ~3 weeks; testing with 3-bit samplers looming in the coming weeks; will interrupt some activities. Episodic issues with some BlBs linked to power supply units (being replaced as possible).
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
1300-1700: Testing/software development time
1800-0930: Science operations and testing
Tue: Maintenance day
%RED0930-1700: Testing/software development time
1800-0630: Science operations and testing
Wed: Maintenance day
0630-1700: 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).
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: Rupen: Subarray testing; CBE merge.
Planetary: Clark/Butler: Jupiter tracking test of new CALC libraries
Spectral line: Momjian: HI High resolution bandpass testing
Spectral line: Dhawan/Clark: Frequency offset phase jumps
Notes: Work on statistics of C configuration (Ashley)
Adv: Solar (Perley):
Notes: Results are that the quiet sun is well handled without the attenuator; consistent results with/without attenuator (with delay); some issues with T304 settings.