italian vlbi experiments - results and challenges to … › workshop › ivtw2016 › ...italian...
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Italian VLBI Experiments - results and challenges to be tackled
Matteo Stagni - IVTW 2016 Haystack - 12 October 2016
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Italian VLBI recapSTATIONS Dish Backend Formatter Recorder Network
Link
Medicina 32 mt dBBC Fila10G Mark5C 10 Gbit
Noto 32 mt dBBCFila10G
+ Mark5B
Mark5B 10 Gbit
SRT 64 mt dBBCFila10G
+ Mark5B
Mark5B +
Mark5C-
Matera(ASI) 20 mt VLBA Mark5B Mark5B 500 Mbit
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Cluster view
Infiniband 40Gbit connection
10 Gbit network
16 cores each
24 disks bay
Now 150 TB available (20 TB SATA + 30 TB SAS each)
Now purchasing a new node
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VLBI - IT astro
• Data from most station (Sr - Mc - Nt - Ys - On) is now VDIF coming from DBBC backend
• SCHED/SKED need workarounds for this - Maybe VEX2 is the answer?
• At the moment correlator side manual hacks kick in
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VLBI - IT astro*================================================== * DEFINITION OF VDIF TRACK BLOCK USING DIFX *================================================== $TRACKS def VDIF; track_frame_format = VDIF/8032/2; enddef;
*================================================== * DEFINITION OF VDIF THREAD BLOCK USING SFXC *================================================== $THREADS; *** single-thread set-up *** FORMAT: last field = total bit-rate over all threads *** THREAD: thrd.ID : backend # : recorder # : data-rate of thread : N_chan : N_bit : : : bytes/packet ; def VDIF512; format = VDIF : : 512;thread= 0:1:1:512:16:2:::8000; channel = &CH01 : 0 : 8;channel = &CH02 : 0 : 12;channel = &CH03 : 0 : 0;channel = &CH04 : 0 : 4;channel = &CH05 : 0 : 9;channel = &CH06 : 0 : 13;channel = &CH07 : 0 : 1;channel = &CH08 : 0 : 5;channel = &CH09 : 0 : 10;channel = &CH10 : 0 : 14;channel = &CH11 : 0 : 2;channel = &CH12 : 0 : 6;channel = &CH13 : 0 : 11;channel = &CH14 : 0 : 15;channel = &CH15 : 0 : 3;channel = &CH16 : 0 : 7;
DiFX SFXC
DiFX also needs re-arranging of $FREQ block
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VLBI - IT astroASTRO VDIF ASTRO2 VDIF ASTRO3 VDIF GEO VDIF
CH Sideband BBC Pol CH Sideband BBC Pol CH Sideband BBC Pol CH Sideband BBC Pol
1 U BBC1 R 1 U BBC1 R 1 U BBC1 R 1 U BBC1 R
2 U BBC2 R 2 U BBC2 R 2 U BBC3 R 2 U BBC2 R
3 U BBC3 R 3 U BBC3 R 3 U BBC5 R 3 U BBC3 R
4 U BBC4 R 4 U BBC4 R 4 U BBC7 R 4 U BBC4 R
5 U BBC5 L 5 U BBC9 L 5 U BBC9 L 5 U BBC5 R
6 U BBC6 L 6 U BBC10 L 6 U BBC11 L 6 U BBC6 R
7 U BBC7 L 7 U BBC11 L 7 U BBC13 L 7 U BBC7 R
8 U BBC8 L 8 U BBC12 L 8 U BBC15 L 8 U BBC8 R
9 L BBC1 R 9 L BBC1 R 9 L BBC1 R 9 L BBC1 R
10 L BBC2 R 10 L BBC2 R 10 L BBC3 R 10 L BBC8 R
11 L BBC3 R 11 L BBC3 R 11 L BBC5 R 11 U BBC9 R
12 L BBC4 R 12 L BBC4 R 12 L BBC7 R 12 U BBC10 R
13 L BBC5 L 13 L BBC9 L 13 L BBC9 L 13 U BBC11 R
14 L BBC6 L 14 L BBC10 L 14 L BBC11 L 14 U BBC12 R
15 L BBC7 L 15 L BBC11 L 15 L BBC13 L 15 U BBC13 R
16 L BBC8 L 16 L BBC12 L 16 L BBC15 L 16 U BBC14 R
Table 2: Channels, BBCs, Sidebands and Polarization assignments when using the several ASTRO and the GEO setups on a DBBC when
VDIF data format is selected
12
See M.Stagni publication (memo) https://www.ira.inaf.it/Library/rapp-int/495-16.pdf
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VLBI - IT astro
+Torun (Poland) Yebes (Spain)
Irbene (Latvia) Onsala (Sweden)
HartRAO (South Africa)
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VLBI - IT data
• Yebes - Onsala - SRT transfer data through m5copy*
• Torun - Hart - Irbene through FTP
* thanks to Harro Verkouter
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SCHED VEX
FieldSystem
correlator (DiFX)
dBBC Fila10G (formatter) VSMScheduler+ jive5ab
Scan files
network
MK5B
MK5C MK6Mark5B as formatter
VLBI - IT dataMedicina
+ Noto
standard procedure
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Configuring jive5ab on telnet port 2620 in Fila10G Mark5B mode telnet: connect to address 127.0.0.1: Trying 127.0.0.1... Configuration done!
You are scheduling the following scans for experiment ij15l :
Scan ij15l_mc_no0001 @ 2015-02-19 13:00:00 Scan ij15l_mc_no0002 @ 2015-02-19 13:01:15 Scan ij15l_mc_no0003 @ 2015-02-19 13:02:30 Scan ij15l_mc_no0004 @ 2015-02-19 13:03:45 Scan ij15l_mc_no0005 @ 2015-02-19 13:14:00 Scan ij15l_mc_no0006 @ 2015-02-19 13:28:00 Scan ij15l_mc_no0007 @ 2015-02-19 13:29:15 Scan ij15l_mc_no0008 @ 2015-02-19 13:30:30 Scan ij15l_mc_no0009 @ 2015-02-19 13:31:45 Scan ij15l_mc_no0010 @ 2015-02-19 13:42:00 Scan ij15l_mc_no0011 @ 2015-02-19 13:56:00 Scan ij15l_mc_no0012 @ 2015-02-19 13:57:15 Scan ij15l_mc_no0013 @ 2015-02-19 13:58:30 Scan ij15l_mc_no0014 @ 2015-02-19 13:59:45 Scan ij15l_mc_no0015 @ 2015-02-19 14:10:00 Scan ij15l_mc_no0016 @ 2015-02-19 14:24:00 Scan ij15l_mc_no0017 @ 2015-02-19 14:25:15 Scan ij15l_mc_no0018 @ 2015-02-19 14:26:30 Scan ij15l_mc_no0019 @ 2015-02-19 14:27:45 Scan ij15l_mc_no0020 @ 2015-02-19 14:38:00
Waiting for start time ... first scan should begin recording at 2015-02-19 13:00:00
VSMScheduler
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VLBI - IT data
• Yebes - Onsala - SRT transfer data through m5copy*
• Torun - Hart through FTP
* thanks to Harro Verkouter
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VLBI - IT stats• ~ 20 experiments since January 2016
• 50% of VLBI-IT experiments in 2016 gone wrong
• Receivers problems at the stations - sometimes
• Most of all is setups gone wrong because of manual overrides at the backend or misunderstanding in software correlation.
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CYGX3 Experiment
Coverage is continuous from a few up to ~150 Mega-wavelengths, which is important for image fidelity. The source is at about 40 degrees elevation (at lower elevation, the coverage would be a bit 'flatter').
Plot file version 1 created 21-SEP-2016 09:19:45V vs U for CYGX3.SPLIT.2 Source:CYGX3Ants * - * Stokes RRLL IF# 1 Chan# 1
Meg
a W
avln
gth
Mega Wavlngth150 100 50 0 -50 -100 -150
150
100
50
0
-50
-100
-150
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CYGX3 ExperimentCalibrated visibility phase (top panels) and amplitudes (bottom panels) versus frequency for a scan on the phase reference source J2007+4029, for baselines to Sardinia. The phases are very stable, and the amplitudes are also reasonably consistent among IFs. The baseline to Ys is more noisy - we are investigating about the reason.
(I)1
550450350250150
2 3 4 5 6 7 8
200
-200
Plot file version 1 created 21-SEP-2016 09:26:33J2007+4029 I6245.UVDATA.1Freq = 22.1715 GHz, Bw = 16.000 MH Calibrated with CL # 8 and BP # 1 (BP mode 1)
Lower frame: Milli Ampl Jy Top frame: Phas degVector averaged cross-power spectrum Several baselines displayed
MC - SR 1 - 3
(I)1 2 3 4 5 6 7 8
NT - SR 2 - 3
(I)1
10 30
550450350250150
2
10 30
3
10 30
4
Channels10 30
5
10 30
6
10 30
7
10 30
8
10 30
200
-200SR - TR 3 - 4
(I)1
10 30
2
10 30
3
10 30
4
Channels10 30
5
10 30
6
10 30
7
10 30
8
10 30
SR - YS 3 - 5
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CYGX3 ExperimentThe cleaned and restored image of the phase calibrator, which shows a clear extension to the west (a core-jet structure). While this is not ideal for calibration (the 'ideal' calibrator should be point-like), it is still good enough for its purpose, and it shows clearly that the adopted uv-coverage is able to image also extended features. The noise level is 1.2 mJy/beam and the beam size is 1.3 x 0.9 mas, in position angle -84degrees
BOTH: J2007+40 IPOL 22235.365 MHz J2007+4029.ICLN.1PLot file version 1 created 21-SEP-2016 09:30:06
Grey scale flux range= -5.4 366.5 MilliJY/BEAMCont peak flux = 3.6648E-01 JY/BEAMLevs = 3.753E-03 * (-1, 1, 2, 4, 8, 16, 32)
0 100 200 300
Decl
inat
ion
(J20
00)
Right Ascension (J2000)20 07 44.9456 44.945244.945044.944844.944644.944444.944244.9440
40 29 48.614
48.612
48.610
48.608
48.606
48.604
48.602
48.600
48.598
48.596
48.594
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Italian Link for Time and Frequency (LIFT)
• 642 Km from INRIM (Turin) to UNIFI (Firenze) through Medicina station
• double round trip on a single fiber
High-accuracy coherent optical frequency transfer over a doubled 642-km fiber link, D.Calonico et al., Applied Physics B
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• Matera will be the next station to be connected
• Plans to connect also Noto and Cagliari
Italian Link for Time and Frequency (LIFT)
Planned
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MediLIFT Experiment
• 24 hours Geodetic Experiment
• Medicina set permanently on LIFT clock
• Baseline Medicina - Noto
• VDIF recording in real time
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MediLIFT Experiment
Clock jumps
17:30 UTC11:10 UTC
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MediLIFT Experiment
A first SOLVE automatic analysis
produced a solution
containing data from
17:30 UTC to 11:10 UTC
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MediLIFT ExperimentX-band of the session $16SEP27XI; MEDICINA:NOTO (ambig. spacing: 100.0 [ns])
Time (UTC); 2016 Sep 27
Res:
GR
dela
y,
ns
0
0.1
0.2
0.3
-0.1
-0.2
-0.3
-0.4
2016 Sep 28 06:0018:00
A second more detailed
analysis, where 2 clock brakes were placed, has produced results for the
whole series of data but the
error has increased on the baseline
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MediLIFT Experiment
Beginning of experiment
S/X Single Band delay 0
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MediLIFT Experiment
End of experiment
S/X Single Band delay 2 µsec
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EUR137 INRIM clock @ Medicina
Solutions ok for a few hours
Re-syncs form Turin
Alternate scan clocks 50% local maser 50 % LIFT clock
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MediLIFT Experiment
• Was MediLIFT successful? Getting better…
• Need to investigate -> more experiments to follow
• Need to investigate also WhiteRabbit technology (less expensive)
• Funding in progress to connect Matera antenna
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One more thing…
100Gbit
40Gbit
10Gbit IRA Bologna
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Questions - comments?
Matteo Stagni - IVTW 2016 Haystack - 12 October 2016