[GMVAtech 73] Re: Draft GMVA Block Schedule for Session 2023/I starting on May 04

Jun Yang jun.yang at chalmers.se
Mon Mar 13 16:04:03 CET 2023


Hi Eduardo, Thomas and Helge,

Onsala has circular polarisation data. So, there is no need to do a polarisation conversion. We need the frequency range to investigate whether we can get both DBBC2 and DBBC3 run the observations in parallel. Our DBBC3 backend is an independent system (FS + DBBC3 + Flexbuff). We have 400-TB disk space in the new Flexbuff. We might add another station name for the independent backend in the schedule file. Anyway, I have no guarantee of the participation of the DBBC3 backend. Right now, this is a preliminary investigation. 

Regards,

Jun


> On 13 Mar 2023, at 14:54, Thomas Krichbaum <tkrichbaum at mpifr-bonn.mpg.de> wrote:
> 
> ok, I see. the main point would be to define the lower and upper edge of the wider frequency band.
> Most likely I should be roughtly centered on the 86012-86524 MHz band. The formal band center would be
> at 86012+512/2 = 86012 + 256 = 86268. MHz.
> Do you or Helge know the low/high freqs for the recorded ALMA band before the zoom band is applied ?
> This may be a question to the APP team. I don't know this.
> 
> best Thomas
> 
> 
> 
> On 13/03/2023 14:41, jwagner wrote:
>> Regarding correlator spectral output, it would be multiple 64 MHz bands like in "normal" mode. The wideband 2048 MHz baselines will have quite a few more of the 64 MHz bands, many that absent on 512 MHz baselines.  For FITS-IDI the limit to the maximum number of IFs is iirc 32 IF (?). I'll have to double-check. But that would just match a 2048 MHz total.
>> On 2023-03-13 14:03, Thomas Krichbaum wrote:
>>> fyi, please talk to Helge for possible limitations within the existing standard setup.
>>> Do you really have time to deal with additional data, which in the end will not be used
>>> in the scientific analysis ?  I cannot imagine how to fringe fit and combined
>>> broad band data of a small sub-array
>>> with the 'normal' mode.
>>> 
>>> best Thomas
>>> 
>>> 
>>> -------- Forwarded Message --------
>>> Subject: [GMVAtech 71] Re: Draft GMVA Block Schedule for Session 2023/I
>>> starting on May 04
>>> Date: Mon, 13 Mar 2023 13:59:58 +0100
>>> From: Thomas Krichbaum <tkrichbaum at mpifr-bonn.mpg.de>
>>> To: Jun Yang <jun.yang at chalmers.se>, Eduardo Ros <eros at mpifr-bonn.mpg.de>,
>>> Helge Rottmann <rottmann at mpifr-bonn.mpg.de>, gmvatech
>>> <gmvatech at lists.mpifr-bonn.mpg.de>
>>> CC: Roger Hammargren <roger.hammargren at chalmers.se>
>>> 
>>> Hi
>>> 
>>> I haven't thought deeply about this, since it requires
>>> coordination with all stations, including ALMA, GLT, LMT.
>>> 
>>> I leave it to Helge to answer this and I cc to gmvatech.
>>> 
>>> Of course the band should include the standard sky frequency range
>>> 86012.00 -> 86524.00  MHz.
>>> 
>>> Since the wideband recording is an untested add-on, please make sure that
>>> standard setup, circular polarisation performance and data transfer is not
>>> affected in any bad way. We don't want to corrupt approved proposals.
>>> 
>>> 
>>> Helge: The larger bandwidth may affect polarisation. I guess the circular polarizers
>>> are calculated for optimal performance within our 512 MHz band. I don't know
>>> how the cross-polarisation changes outside this band. Owing to limitations at
>>> the correlator, we should avoid polarisation conversion from other stations than
>>> ALMA and LMT.
>>> 
>>> 
>>> 
>>> kind regards, Thomas
>>> 
>>> 
>>> 
>>> On 13/03/2023 13:29, Jun Yang wrote:
>>>> Hi Eduardo, Thomas and Helge,
>>>> 
>>>> What is the observing frequency range at the 16-Gbps stations in the upcoming GMVA session? Onsala may also run the 16-Gbps observations via our DBBC3 backend in parallel.
>>>> 
>>>> 
>>>> Regards,
>>>> 
>>>> Jun
>>>> 
>>>>> On 9 Mar 2023, at 22:09, Eduardo Ros <ros at mpifr-bonn.mpg.de <mailto:ros at mpifr-bonn.mpg.de>> wrote:
>>>>> 
>>>>> 
>>>>>                  GMVA Session   May 2023
>>>>>                  =======================
>>>>> 
>>>>> 
>>>>>    To:   GMVA Principal Investigators and Observatory Staff
>>>>> 
>>>>> 
>>>>> Please find attached Version 0.6 of the Block Schedule for the coming
>>>>> GMVA 3mm VLBI session May 2023. The projects which are scheduled
>>>>> have been selected by the VLBA and European GMVA Schedulers, based on
>>>>> the proposal reviews at NRAO and other GMVA observatories.
>>>>> 
>>>>> 
>>>>> PI's role in schedule making
>>>>> ==========================
>>>>> Thomas Krichbaum (tkrichbaum at mpifr-bonn.mpg.de <mailto:tkrichbaum at mpifr-bonn.mpg.de>) will make an
>>>>> integrated observing schedule for the session.
>>>>> 
>>>>> **  PIs are asked to contact him, to specify to what extent they wish
>>>>> **  to be involved in designing the schedule for the section of the
>>>>> **  session when their project is being observed.
>>>>> 
>>>>>      ===> PIs should contact him at the latest by 25 MARCH
>>>>>                                                   ========
>>>>> 
>>>>>  **************************************************************
>>>>>  *  PIs of projects with non-standard set-ups or frequencies  *
>>>>>  *  should contact Thomas and specify these precisely.        *
>>>>>  **************************************************************
>>>>> 
>>>>> The final, integrated schedule for the session will be made available
>>>>> to the GMVA observatories by 06 APRIL, this time exceptionally (due
>>>>> to the planning of the coming EHT session in April) four weeks
>>>>> before the start of the session on 04 MAY
>>>>>                                    ======
>>>>> 
>>>>> 
>>>>> Participating telescopes
>>>>> ========================
>>>>> Unless otherwise indicated on the schedule, the participating European
>>>>> telescopes ("Eu" on the schedule) are:
>>>>> 
>>>>>    Effelsberg   (Eb)
>>>>>    IRAM NOEMA   (Pb)
>>>>>    Yebes-40m    (Ys)
>>>>>    Onsala-20m   (On)
>>>>>    Metsaehovi   (Mh) (on a best-effort basis)
>>>>>    Greenland T. (Gl) (on a best-effort basis)
>>>>> 
>>>>> 
>>>>> The telescopes available at the VLBA are:
>>>>> 
>>>>>    VLBA_NL
>>>>>    VLBA_FD
>>>>>    VLBA_LA
>>>>>    VLBA_PT
>>>>>    VLBA_KP
>>>>>    VLBA_BR
>>>>>    VLBA_OV
>>>>>    VLBA_MK
>>>>> 
>>>>> Telescopes of the Korean VLBI Network (KVN) will take part in projects:
>>>>> 
>>>>>    MP005A
>>>>>    MI004
>>>>>    MN004A
>>>>>    MR014A
>>>>>    POLCAL3
>>>>>    MJ004
>>>>>    MR014B
>>>>>    MP008
>>>>>    MK025
>>>>>    MB019C
>>>>>    MR014C
>>>>>    MP005B
>>>>> 
>>>>> The GBT will take part in projects:
>>>>> 
>>>>>    MP005A
>>>>>    MI004
>>>>>    MP008
>>>>>    MK025
>>>>>    MP005B
>>>>> 
>>>>> ALMA will take part in projects:
>>>>> 
>>>>>    MP005A (2023.1.00750.V)
>>>>>    MI004  (2023.1.01054.V)
>>>>>    MN004A (2023.1.00366.V)
>>>>>    MN004B (2023.1.00366.V)
>>>>>    MN004C (2023.1.00366.V)
>>>>>    MJ004  (2023.1.00853.V)
>>>>>    MK025  (2023.1.00710.V)
>>>>>    MP005B (2023.1.00750.V)
>>>>> 
>>>>> The LMT will participate on a best-effort basis in experiments with a
>>>>> preference for night scheduling (04-13 UT in May 2023):
>>>>> 
>>>>>    MP005A (2023-S1-MX-1)
>>>>>    MI004  (2023-S1-MX-3)
>>>>>    MR014A (2023-S1-US-17)
>>>>>    MJ004  (2023-S1-MX-2)
>>>>>    MR014B (2023-S1-US-17)
>>>>>    MR014C (2023-S1-US-17)leaning on
>>>>>    MP005B (2023-S1-MX-1)
>>>>>    MP008  (2023-S1-MX-23, potentially with daytime observations)
>>>>> 
>>>>> ATCA and Mopra will participate on a best-effort basis for experiments:
>>>>>    MP005A
>>>>>    MI004
>>>>>    MJ004
>>>>>    MP005B
>>>>> 
>>>>> Haystack is expected to participate on a best-effort basis for experiments:
>>>>> 
>>>>>    MI004
>>>>>    MR014A
>>>>>    MR014B
>>>>>    MR014C
>>>>> 
>>>>> 7mm observations, potentially including Noto for common coverage with
>>>>> the VLBA, have been requested for experiments:
>>>>>    MB019B
>>>>>    MB019C
>>>>> 
>>>>> 
>>>>> Recording mode
>>>>> ==============
>>>>> 
>>>>> All projects are aimed to be recorded at GMVA observatories using the
>>>>> GMVA 4 Gbps DDC mode, for the stations which can support that.
>>>>> 
>>>>> Several projects have requested a subset of the antennas to observe
>>>>> at 16 Gbps, this is being implemented.
>>>>> 
>>>>> All data will be correlated at the Bonn DiFX software correlator.
>>>>> Available disk capacity will determine the fraction of the scheduled
>>>>> time which can be spent recording data.  Helge Rottmann (Chair of the
>>>>> GMVA Technical Group) will make a final decision on this when all the
>>>>> constraints have been considered.
>>>>> 
>>>>> 
>>>>> Polarization
>>>>> ============
>>>>> All observations will be recorded using dual LHC+RHC polarization at
>>>>> those telescopes where this is possible.
>>>>> 
>>>>> 
>>>>> General considerations
>>>>> ======================
>>>>> 
>>>>> A copy of the block schedule is available on the MPIfR FTP server in
>>>>> case minor mistakes are fixed.  Major changes and the final schedule will be
>>>>> communicated via email.  This is the address:
>>>>> ftp://ftp.mpifr-bonn.mpg.de/outgoing/ros/GMVA/MMschedule_2023_1.asc <ftp://ftp.mpifr-bonn.mpg.de/outgoing/ros/GMVA/MMschedule_2023_1.asc>
>>>>> ftp://ftp.mpifr-bonn.mpg.de/outgoing/ros/GMVA/MMschedule_2023_1.pdf <ftp://ftp.mpifr-bonn.mpg.de/outgoing/ros/GMVA/MMschedule_2023_1.pdf>
>>>>> 
>>>>> 
>>>>> ==> Please contact me (ros at mpifr-bonn.mpg.de <mailto:ros at mpifr-bonn.mpg.de>) IMMEDIATELY if you
>>>>>    find any mistakes or problems with this version of the schedule.
>>>>> 
>>>>> 
>>>>> Eduardo Ros
>>>>> 
>>>>> (European GMVA Scheduler)
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> <MMschedule_2023_1.asc><MMschedule_2023_1.pdf>
>>>> 
> 
> -- 
> Dr. Thomas P. Krichbaum
> Max-Planck-Institut fuer Radioastronomie
> Auf dem Huegel 69
> D-53121 Bonn / Germany
> 
> Mail: tkrichbaum at mpifr-bonn.mpg.de
> Tel.: (Germany +49)-228-525-295
> Web : http://www.mpifr-bonn.mpg.de/research/vlbi
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