Meetings :: KSP Synergy meeting (25 May 2007, Amsterdam)
Date | 25 May 2007 |
Location | Amsterdam |
Participants | C. Vogt, I. Snellen, Peter Barthel, A. Horneffer, B. Stappers, R. Fender, G. de Bruyn, L. Koopmans, H. Rottgering, L. Baehren, R. Wijers |
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Invitation
As Friday and thus, our meeting on KSP (observation) synergies draws closer, it is time to think about preparing a bit for the meeting. The meeting will be held on Friday, May 25, starting at 11am - 3pm in Amsterdam (Pannekoek kamer at the Pannekoek Institut/UvA)
The main aim of this meeting is to identify where and when observation and (re-)processing time can be shared and/or optimised between the KSPs. A secondary goal would be to flag further synergies which should be discussed at a later meeting.
In order to achieve this, a little preparation from all of us might be necessary. I attach to this email a document which Michiel van Haarlem drafted a year ago concerning observation requests from each of the KSPs. It would be great if each KSP could check the numbers and update the document if necessary by Wednesday night and send their updates to me for further distribution. These summaries should contain the following points:
Where on the sky
What resolution (baselines)
What frequencies, bandwidth and spectral resolution
How long/deep individual observations and total observation time
Scheduling constraints
What processing steps are envisaged/final data products
Calibration requirements (if any thoughts exist already)
Agenda
11.00 | Welcome + Intro (Wijers & Vogt) |
Setting the scene: Short presentations by the KSP concerning their observation proposal (detailing the points above)
11.10 | EoR - de Bruyn |
11.20 | TKP - Fender |
11.30 | CR - Bähren |
11.40 | Survey - Röttgering |
11.50 | Discussion: Identify possible synergies |
12.30 | lunch |
13.30 | Discussion: Feasiblity of identified synergies |
14.15 | Disucssion: Where to go from here? - Realistic observation schedule |
14.30 | Discussion: Flag further synergies between KSP's (and foreign KSP's) to be explored at follow-up meetings |
15.00 | End of Meeting |
Notes from the presentations
Introduction (Corina)
goals of the meeting:
software synergies to be coordinated via Michael
switching of observation data (esp. with international partners); current existing plan is relative, but it is not clear where the absolute reference point is
reminder of the requested details
time table for meeting
Epoch of Reionization (Ger)
EoR Observing Plan
definition of 3 subprojects
A shallow survey of the Galactic halo:
claimed as minimum scientific output for the KSP → this is disputed, since this interferes with the goals of the other KSPs
at least 10 core + all available outer stations
32
MHz bandwidth at CEP and 8 beams
900 hrs for shallow survey
NCP observations using 10 beams times 3 settings times 3 hours at 96
MHz coverage
a single beam survey of 3-5 EoR windows
a deep multi-beam survey of 3-5 EoR windows
selection of frequency bands and times should be worked out by the individual KSPs, using data available from CS-1
hour angle - elevation plan plot for identifying observing windows (e.g. taking into account the minimum integration time)
selection for low (polarized) galactic foreground
Transients (Rob)
radio sky monitor mode
zenith scanning
pointing: 8 locations at <m>delta</m>=53 deg spaced by 3h in RA
baselines: core only
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bandwidth: 1
MHz, increasing to 32
MHz when possible
depth: 3h scans of 320 sec cycle (160 sec per frequency)
synergies: generated maps might be of use for other KSPs
galactic plane scanning
targetted observations
trigger response mode
Piggybacking
Pulsar All Sky Survey
Cosmic Rays (Lars)
Surveys
Outcome of LC meeting (07/03/2007)
baselines: long
frequency settings:
Depth: flexible, but aim is Nx5 hours
scheduling constraints: flexible, but ionospheric conditions such that reduced maps with PSF < 1.2 synthesized beam
calibration: close to thermal noise
data products: source catalog
synergies: EoR and Transients
Which surveys first: shallow survey from top-down in frequency
List of norther fields: overlap with Transients observing regions? not yet checked
long baselines for EoR? → up to 20-30 km, depending on possibility to do proper calibration (tomographic imaging of the ionosphere volume through which the observation is done), also to do substraction of foreground sources
Notes from the discussion(s)
Will the scheduling software be able to consider overlap in the submitted observations or is this something which needs to be done by the observers themselves? Some scheduling software is able to do this. Questions is however how the observation parameters need to be defined/provided to enable automatic combination.
Roll-out plans:
Coordination of the various observations and their execution strongly depends on the available infrastructure (including software); some of the required pieces can be identified based on the worked out processing pipelines. Relevant is also the development plan from the side of the project (station roll-out, central software capabilities).
Testing vs. science:
Some KSPs already might get some initial science out of the commissioning work, whereas for other KSPs there is a rather clear separation between commissioning/testing and science operation.
What about encountered results: are they about to be published and if so who should be credited?
Should it be responsibility of the project to clearly draw a line between commissioning work and preparatory science of the individual KSPs?
Need for discussion later on: who owns the science? → this is e.g. the above issue concerning certain types of surveys.
also with commissioning there is the competition between e.g. general software development and dedicated pipeline development
Discussion on publication rights and arrangements to be held in ARC, preferably until end of the summer (otherwise there will be considerable problems to get everyone together); it is not considered too likely that substantial science will come out of CS-1 – with the 15+5 setup in 2008 chances for serious observing are considerable
keep in mind the timelines set by the available funding
is there the need for some sort of accounting system
suggestion to request from the KSPs an observation plan for 2008, which should be handed in until November 2007 (to be decided upon by the ARC by December)
What about coordination of requirements and priorities? To some degree an overview has been compiled with the SEG and the USG, based on the available input from the KSPs.
Possibility of sub-stations, to combine LBA and HBA observation? This might introduce additional flexibility in combining observations or have observations taking data in parallel in both frequency ranges.
Feedback from DCLA review:
Not yet considered: international KSPs and their contribution/requirements.
List of identified synergies
Start with synergies in final LOFAR: brief document discussion suggested synergies, including
scheduling (common fields, bandwidth usage, etc.)
required software (user software, central processing)
compute power
equal partner relationships
main/minor relationships of observations
Synergy areas in combination of observations
Targeted observations of known transient sources/pulsars in Survey fields [Ben]
Targeted observations of known transient sources/pulsars in EoR fields [Ben, Ger]
Pulsar surveys in EoR fields [Ben, Ger]
Pulsar surveys in Survey fields [Ben]
RSM fields & Deep Surveys → technical requirement: parallel handling of long and short baselines [Rob]
CR with Surveys LBA observations [Andreas,Huub]
CR with Transients LBA observations [Andreas,Ralph]
Galactic foreground for EoR from Surveys (30
MHz) and Transients (120
MHz)
[Leon,Peter,Rob]
Nearby galactic and extragalactic Pulsars in Survey fields [Ben,Rafaella]
Persons listed in brackets [] are to provide names of the persons to actually take up the task to work out the synergies; information should be provided within 1 week notice.
Synergy areas in processing
Tied-array clock precision (on-line calibration) [Ben, Andreas]
De-Dispersion module (CR/Pulsars) [Andreas]
Databases: design & architecture [Lars, Bart, Vriend]
Polarization calibration [Ger]
source finding and characterization [Huub] → some of this is computing infrastructure to be provided via USG
Image differencing (Transients, Surveys, EoR) [Rob → James]
Mosaicing aspects [Huub]
Timeline
Aug 15
Sep 01
Oct 01
Nov 01
Action items
Item | Description | Responsible |
01 | Assign people to work out synergy areas in combination of observations | participants listed in brackets above |
02 | Assign people to work out synergy areas in processing | participants listed in brackets above |