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Discussion Part I: Commissioning, Data Analysis, and Storage
James M Anderson
anderson@mpifr-bonn.mpg.de

On behalf of LOFAR


LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25 James M Anderson 1/11


Agenda


Get you started on major decision points for MKSP Let you talk things over at dinner At the bar afterward Sleep on things Come back tomorrow prepared to argue your case in Discussion Part II

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25

James M Anderson

2/11


Time


MKSP optimisticly gets 12% of KSP time For 5 years of LOFAR, this is 5260 hours More realisticly, get only half of that, so 2630 hours What can we do with LOFAR in 2600 hours of time?
­ ­

What can we piggyback? What do we drop? Will probably take longer to process data that to observe Processing facility allocation more important than observing time May need to purchase processing facilities for the MKSP



Processing time
­ ­ ­

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25

James M Anderson

3/11


Data Volume


NaОve calculation for Full LOFAR gives 2.25 PB for 100 h nearby galaxy observations
­

Ionospheric calibration may require simultaneous observation and calibration of multiple (say 4) fields, multiplying the storage requirement



If commissioning tests/science drivers allow, may be able to gain back factors of 4--16 from time/frequency averaging
­

What angular/RM resolution/field of view do you need?



Shallow observations on many targets, then go deep later on on a subset?
­ ­ ­

Need to store visibilities/images/RM cubes to add to later? How many? 10 targets at 10 h each is still 2.25 PB

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25

James M Anderson

4/11


Questions for Afternoon Talks?


MKSP Overview LOFAR Status

(Beck)

(Brentjens) (de Bruyn) (de Bruyn) (Anderson)

Polarization Calibration

Commissioning Timeline Data Volumes
(Anderson)

LOFAR Technical Details Project Documents

(Anderson) (Heald)

RM Synthesis Frequency Coverage RM Wavelet Transform Source Finding
(Scaife) (Duscha)

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25

James M Anderson

5/11


Questions for Working Groups?


Milky Way

(Haverkorn) (Beck)

Nearby Galaxies Radio Galaxies Pulsars
(Noutsos)

(de Bruyn)

Jets and Transients

(?)

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25

James M Anderson

6/11


Questions for Other KSPs?


Surveys EoR Solar
(---)

(Roettgering)

(de Bruyn)

Transients SKA

(---) (---)

Cosmic Rays
(Alexander)

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25

James M Anderson

7/11


Commissioning



HELP!?!
3
­

Preparing for MS MS
­

Things we can do right now
3



No earlier than 2009 Oct May have all LOFAR stations by end of MS3 What extra will we need to commission/test/develop Sign-up list
James M Anderson 8/11



After MS3 (Full LOFAR)
­ ­



Need to start commissioning reduction in April
­

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25


Data Analysis


Development task groups RM synthesis Source finding Visualization Astronomer interaction

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25

James M Anderson

9/11


Data Storage


Groningen facilities MKSP archive center? Processing/reprocessing Data access (network access, disk shipping, etc.) Visibility data volumes Image/RM cube data volume

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25

James M Anderson

10/11


MKSP Documents


Project Plan
­ ­

Working group leaders Major discussion on what we can accomplish in the MKSP given reasonable KSP time allocation and LOFAR technical details Need to organize a full day meeting for working group leaders and technical experts to get these finished



Use Cases
­



Calibration Document Commissioning Plan
­

Need to get started on this at this meeting



LOFAR observing proposals
James M Anderson 11/11

LOFAR Magnetism KSP Meeting, Cambridge, 2009 Mar 25