From: <garrett_at_email.protected>
Date: Thu, 21 Apr 2011 13:03:03 +0200

Hi Steve - memo 125 left the door open for PAFs to be included in SKA_1 or
some
subset of it. I think we are quite explicit in the text. You are right that
the
baseline SKA_1 has single-pixel feeds but we recognised the possibility that

ome technologies (specifically PAFs) might reach maturity on fairly short
time-scales,
so that a decision point (2014?) was introduced to re-visit their
feasibility as a potential cpt of phase 1.
I see in some follow-up documents that this point is not always fully
appreciated or that
conflicting statements arise in these documents. Memo 125 is pretty clear on
this however and
I have been consistent in all other publications and have highlighted
problems when other
docs have sometimes not fully appreciated this aspect of SKA_1.

cheers, Mike.

On 21 April 2011 10:43, Steve Torchinsky <torchinsky_at_obs-nancay.fr> wrote:

> Hi Carole,
>
> Regarding PAF and SKA_1, I'm afraid I'm unclear about this. Memo 125
> and Memo 130 defined SKA_1 with single pixel feeds. As I understand
> the history, there was a criticism at the system CoDR (early 2010)
> that SKA was leaving too many options open, and there was a need to
> make technology decisions. The result was Memo 125, and then Memo 130
> with a more detailed technology description.
>
> Is it really possible (from a management point of view) for PAF to be
> selected for SKA_1?
>
> cheers,
> Steve
>
> --
> Steve Torchinsky, directeur adjoint / assistant director
> Station de radioastronomie de Nancay / Nancay Radio Astronomy Facility
> Observatoire de Paris & CNRS & Universite d'Orleans
> ph. +33 2 48 51 82 41, http://www.obs-nancay.fr
>
> On Wed, 20 Apr 2011, Carole.Jackson_at_csiro.au wrote:
>
> Date: Wed, 20 Apr 2011 07:54:49
>> From: Carole.Jackson_at_csiro.au
>> To: pafska_at_atnf.csiro.au
>> Subject: [pafska] PAFSKA teleconf 27 April 21 UT - details & outline
>> agenda
>>
>>
>> Hi
>>
>> The next PAFSKA teleconf will be on Wednesday 27 April at 21 UT. Please
>> use the call in using the numbers given below.
>>
>> Agenda
>>
>> 0. Review of discussion of 3 March & follow up actions.
>>
>> 1. Quick round table of progress & significant events (Apertif, ASKAP,
>> BYU, DRAO etc)
>>
>> 2. PrepSKA WP2.2 CoDR developments - major events/progress (Neil)
>>
>> 3. Preparation for PrepSKA WP2.2.3 CoDR, PAF inputs.
>>
>> During this discussion we will
>>
>> - review of the identified system concepts for PAFs;
>>
>> - discuss how we assess their viability (cost/performance) ahead of the
>> CoDR, and how to present a convincing argument for a PAF technology to be
>> adopted as part of SKA_1;
>>
>> - What contributions those in this PAFSKA group wish to make for all of
>> the above.
>>
>> Noting that the PAF system concepts which are under development for the
>> CoDR are
>>
>> (i) PAF Feed Array CSIRO-led concept - Chequerboard (being drafted - not
>> ready for circulation)
>> (ii) PAF receiver CSIRO-led concept - RFoF (RGG et al draft attached)
>> (iii) PAF receiver CSIRO-led concept - I/Q mixer (RGG et al draft
>> attached)
>> (iv) PAF receiver DRAO-led concept - direct sampled system
>>
>> (v) PAF beamformer design (Bunton/Grant); already submitted as part of DSP
>> CoDR (SKA wiki)
>>
>> 4. PAFSKA workshop; based on level of interest we'll determine
>> whether to proceed with this; scheduled at BYU for 25-27 May.
>>
>> Please feel free to circulate any relevant material ahead of the telecom.
>>
>> Best regards
>> Carole
>>
>> .................
>>
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>>
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>>
>>
>> Dr Carole Jackson
>> Business Development Manager & WP2 leader
>> CSIRO Astronomy and Space Science
>>
>> Phone: +61 2 9372 4407 | Mobile: 0432 925 932
>> carole.jackson_at_csiro.au | www.csiro.au | www.atnf.csiro.au
>> Address: CSIRO RadioPhysics Laboratory, cnr Vimiera & Pembroke Roads,
>> Marsfield, NSW 2212
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-- 
Professor Michael A. Garrett
General Director & Scientific Director ASTRON
Netherlands Institute for Radio Astronomy
Postbus 2, 7990 AA Dwingeloo, The Netherlands.
Phone (office): +31 521 595126;
Phone (PA): +31 521595119;
Phone (Reception): +31521595100
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e-mail: garrett_at_astron.nl
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blog: mikegarrett.blogspot.com
www.twitter.com/astron_lofar
Also affiliated with Sterrewacht Leiden, (Leiden University) & Centre for
Astrophysics & Supercomputing, Swinburne.

Received on 2011-04-21 21:03:53