Table of contents
- 1. MG002 Correlation Report
- 1.1. General
- 1.2. Status
- 1.3. Fringes
- 1.4. Notes
- 1.5. Post-Correlation checks
- 1.5.1. FITS completeness (pclist)
MG002 Correlation Report
General
- Session info: http://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/
- Station feedback: http://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/sessions/apr17/feedback_apr17.asc
- ALMA QA2: 2016.1.01116.V was used for polarization conversion
- This experiment has ALMA with 32x62.5MHz, VLBA with 2x128MHz channels, and most of the EVN with a 1x512MHz channel
- Two EVN stations (Yebes, Pico Veleta) observed in an incorrect backend mode, with a 32 MHz polyphase filterbank. Yebes had the correct backend mode in scans No0064 to No0067 but not in later scans.
- Due to the issue at Yebes and Pico, three correlations were performed:
- a) standard ALMA correlation setup (58 MHz bands)
- b) narrower band correlation setup (32 MHz bands)
- c) emulated standard ALMA correlation setup (58 MHz bands), accomplished via a mixed-bandwidth correlation with additional postprocessing of all baselines to Yebes and Pico Veleta to reconstruct 58 MHz bands
- The details of correlation run (c) are: the experiment was correlated with 58 MHz bands and several narrower bands that fitted the Pico/Yebes recorded bands (e.g., 32 MHz, 24 MHz, 2 MHz and similar). After correlation the visibility data were ran
through a post-processing script in order to form 58 MHz bands from the narrow bands (i.e., combining visibilities in frequency domain from e.g. 32 + 24 + 2 MHz bands). This step included spectrally averaging inside the 58 MHz bands from a total of 3712 channels per band down to the final 116 channels per band that matched the originally intended correlation mode. Correlation (c) was run twice, first for scans No0064 to No0067 where only Pico had the incorrect backend mode, then for other scans where both Pico and Yebes had the incorrect backend mode. Scans without Pico and Yebes were not re-correlated but were taken from standard correlation (a). - The FITS files are delivered in two variants due to the problems with Pico and Yebes that were outlined above.
- mg002.fits: Standard correlation (a) with Pico and Yebes excluded during correlation
- mg002_merged_set1.fits, mg002_merged_set2.fits: Special correlation with post-processing (c). Note1: scan No0078 contained corrupted DiFX output data, and unfortunately a recorrelation of that scan is not possible, since raw recordings of this and other experiments have been lost due to a computing cluster file storage issue. Note2: Yebes (but not Pico) briefly had the correct backend mode during scans No0064 to No0067
The output is unfortunately provided as two sets, that need to be merged in AIPS, as DiFX difx2fits is failing to combine into one FITS file the data from certain scans that have a differing number of antennas than other scans.
Status
| What | Date |
|---|---|
| Correlation 2nd round finished | 21.8.2017 |
| Conversion to HOPS | 5.9.2017 |
| Fourfit fringe fitting | 5.9.2017 |
| Conversion to FITS with -u (union) option | 5.9.2017 |
| PCList check | 5.9.2017 |
| aedit plots, alist v6 residual rate and delay plots | 5.9.2017 |
| re-run with updated polconvert | 18.12.2017 |
| Material sent to PI | (pending final ALMA QA2 solutions) |
Fringes
| Station | Fringes | Comment |
|---|---|---|
| Ef | yes | Effelsberg DBBC2 |
| Eb | yes | Effelsberg RDBE |
| On | yes | |
| Aa | yes | |
| Mh | no | faulty backend configuration |
| Pv | yes | LCP bad (2bit sample dist. 78%:0:0:22%), is OK in ma008 and mb007 |
| Ys | yes | |
| Fd | yes | |
| La | yes | |
| Pt | yes | weak or no fringes |
| Nl | yes | |
| La | yes | |
| Kp | yes | |
| Ov | yes | |
| Mk | no | wide fringe search but no fringes found |
| Br | yes |
Fringes plotted on all baselines to Effelserg (No0134 Effelsberg PDF), and ALMA (No0140 ALMA PDF), and VLBA only (No0200 VLBA FD PDF).
Notes
- In case (c) the additional processing consisted of, first, correlation with 58 MHz bands and several narrower bands that fitted the Pico/Yebes recorded bands (e.g., 32 MHz, 24 MHz, 2 MHz and similar), secondly, after correlation passing the visibility data through a post-processing script to form 58 MHz bands on the affected baselines using the narrow bands (i.e., combining visibilities in frequency domain from 32 + 24 + 2 MHz bands), thirdly, spectrally averaging inside the 58 MHz bands from 3712 channels per band to the final goal of 116 channels per band that matches the originally intended correlation mode.
- Yebes began recording 20 seconds late in every scan; lost scans No0061 to No0063; recorded scans No0064 to No0067 in wideband mode as intendend; recorded scans No0068 until the end in 32 MHz polyphase filter bank mode
- Pico restarted backend for scan 092-2100, bad sampler statistics in earlier scans
Post-Correlation checks
Residuals
reference A (ALMA), pols LL and RR, residuals in 32 MHz correlation run (a)
reference Y (Yebes), pols LL and RR, residuals in 32 MHz correlation run (a)
reference A (ALMA), pols LL and RR, residuals in 58 MHz correlation run (c)
reference Y (Yebes), pols LL and RR, residuals in 58 MHz correlation run (c)
reference E (Effelsberg), pols LL and RR, residuals in 58 MHz correlation run (c)
FITS completeness (pclist)
Legend:
o: station is included in the FITS-file (data is complete)
x: expected station is missing in the FITS-file
number: percentage of job time in the FITS-file compared to expected time.
EF EB ON YS PV MH NL FD PT LA KP OV BR AA MK
mg002_01 No0061 OJ287 3mm_ddc o o o x x 93 . . . . . . . . .
mg002_02 No0062 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_03 No0063 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_04 No0064 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_05 No0065 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_06 No0066 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_07 No0067 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_08 No0068 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_09 No0069 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_10 No0070 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_11 No0071 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_12 No0072 OJ287 3mm_ddc o o o x x 95 . . . . . . . . .
mg002_13 No0075 J0510+18 3mm_ddc o o o x x x o o o o o o o . .
mg002_14 No0078 J0510+18 3mm_ddc o o o x x x o o o o o o o . .
mg002_15 No0081 OJ287 3mm_ddc o o o x x x o . . . . . . o .
mg002_16 No0084 J0510+18 3mm_ddc . . . . . . . o o o o o o . .
mg002_17 No0087 OJ287 3mm_ddc o o o x x 50 o . . . . . . o .
mg002_18 No0090 J0510+18 3mm_ddc . . . . . . . o o o o o o . .
mg002_19 No0093 OJ287 3mm_ddc o o o x x 95 o o o o . . . o .
mg002_20 No0096 OJ287 3mm_ddc o o o x x 95 o o o o o . o o .
mg002_21 No0099 J0510+18 3mm_ddc o o o x x . o o o o o o o o .
mg002_22 No0102 OJ287 3mm_ddc o o o x x 95 o o o o o o o o .
mg002_23 No0105 OJ287 3mm_ddc o o o x x 95 o o o o o o o o .
mg002_24 No0108 OJ287 3mm_ddc o o o x x 95 o o o o o o o x .
mg002_25 No0111 J0510+18 3mm_ddc . . . . . . o o o o o o o o o
mg002_26 No0112 1055+018 3mm_ddc o o o x x o . . . . . . . . .
mg002_27 No0115 OJ287 3mm_ddc o o o x x 95 o o o o o o o o .
mg002_28 No0118 OJ287 3mm_ddc o o o x x 95 o o o o o o o o .
mg002_29 No0121 OJ287 3mm_ddc o o o x x 95 o o o o o o o x .
mg002_30 No0124 J0510+18 3mm_ddc . . . . . . o o o o o o o o .
mg002_31 No0125 1055+018 3mm_ddc o o o x x 16 . . . . . . . . .
mg002_32 No0128 OJ287 3mm_ddc o o o x x 95 o o o o o o o o .
mg002_33 No0131 OJ287 3mm_ddc o o o x x 95 o o o o o o o o .
mg002_34 No0134 OJ287 3mm_ddc o o o x x 95 o o o o o o o x o
mg002_35 No0137 1055+018 3mm_ddc o o o x x 95 o o o o o o o o .
mg002_36 No0140 OJ287 3mm_ddc o o o x x . o o o o o o o o o
mg002_37 No0143 OJ287 3mm_ddc o o o x x . o o o o o o o o o
mg002_38 No0146 1055+018 3mm_ddc o o o x x . o o o o o o o x .
mg002_39 No0149 OJ287 3mm_ddc o o . x x . o o o o o o o o o
mg002_40 No0152 OJ287 3mm_ddc . . . . . . o o o o o o o o o
mg002_41 No0155 OJ287 3mm_ddc . . . . . . o o o o o o o o o
mg002_42 No0158 1055+018 3mm_ddc . . . . . . o o o o o o o x .
mg002_43 No0161 OJ287 3mm_ddc . . . . . . o o x o o o o o x
mg002_44 No0164 OJ287 3mm_ddc . . . . . . o o x o o o o o x
mg002_45 No0167 OJ287 3mm_ddc . . . . . . o o x o o o o o x
mg002_46 No0170 1055+018 3mm_ddc . . . . . . o o x o o o o x x
mg002_47 No0173 OJ287 3mm_ddc . . . . . . o o x o o o o o x
mg002_48 No0176 OJ287 3mm_ddc . . . . . . o o x o o o o o x
mg002_49 No0179 1055+018 3mm_ddc . . . . . . o o 73 o o o o o 73
mg002_50 No0182 OJ287 3mm_ddc . . . . . . o o o o o o o . o
mg002_51 No0185 OJ287 3mm_ddc . . . . . . o o o o o o o . o
mg002_52 No0188 OJ287 3mm_ddc . . . . . . o o o o o o o . o
mg002_53 No0191 1055+018 3mm_ddc . . . . . . o o o o o o o . o
mg002_54 No0194 OJ287 3mm_ddc . . . . . . o o o o o o o . o
mg002_55 No0197 OJ287 3mm_ddc . . . . . . o o o o o o o . o
mg002_56 No0200 OJ287 3mm_ddc . . . . . . o o o o o o o . o
mg002_57 No0203 1055+018 3mm_ddc . . . . . . o o o o o o o . o
mg002_58 No0206 OJ287 3mm_ddc . . . . . . o o o o o o o . o
mg002_59 No0209 OJ287 3mm_ddc . . . . . . o o o o o o o . o
mg002_60 No0210 OJ287 3mm_ddc . . . . . . x x x x x x x . o
Comments