Overall status: In CnB configuration; many deferred changes in the system (particularly correlator-based) so expecting impact on science; attempted science restart last night but not quite ready yet (more in Correlator section).
News from the ALMA Spectroscopy workshop.
Propose no meeting next Tuesday in honor of the upcoming proposal submission deadline and the ongoing move activities.
Key dates: * 01 Feb: Proposal deadline for D configuration+ * 03-04 Feb: Dish verification review ($KA)
05 Jan - 06 Apr: John Cannon sabbatical at DSOC
New RSRO Scientists: Sergio Dzib, Hendrik Linz, Ashley Zauderer
Commissioning priorities for the week (McMullin, Chandler)
Single maintenance day week:
0900-1700 Testing/software development time
1800-0900: Science operations
Wed: Maintenance day
Interrupt status for additional 3-bit testing
Hardware status and updates (Langley, Perley, Rupen)
EA16 to array on 27Jan; EA13 to AAB on 27Jan.
Antennas with 3-bit samplers: EA12, (EA15), EA22, EA28
Array: Dhawan/Rupen: RF switch tests with rapid monitoring; status
Notes: Major suite of changes encompassing a range of CMIB updates; currently experiencing issues with loss of correlation on sets of antennas due to problems on particular baseline boards; being investigated.
Followup details: Mostly good stability less than 1% bandpass for most; some indication of attenuators not 'remembering' between band changs leading to 1-2% issues with bandpass; key problem. Other signs of issues with phase stability at X, Ku; switched power testing shows good correction for variations (diurnal in receivers) with the exception of 1-2 antennas.
Calibration: Hunter/Brogan/McMullin: Residual delays in observations
Status/discussion: no differences between wide-band and narrow-band observations. Overall seeing delays of ~2-3 ns which is currently within the operating specification regime. However, Todd has noted that ALMA's spec is much smaller (1 picosecond) and errors on the order of our 'standard' will still lead to dynamic range issues if not solved for. There are apparently two different routines available that need to be tested out for CASA reduction: K term calibration in gaincal; multi-band group delay script from Nick (CAS-2618).