From: <devos_at_email.protected>
Date: Thu, 21 Apr 2011 13:23:51 +0200

I can add to this that in the PEP, decision points and processes have
been identified for inclusion of AIP technologies (most notably PAFs) in
SKA_1. See the GANTT chart on page 55 and text on a.o. pg 11, section
4.2.1.2, 4.2.4.
Please note that the PEP stresses the need for adequate risk mitigation
and for a thorough impact analysis of the inclusion of AIP technology in
SKA1.
Groeten,
Marco.

>>> Mike Garrett <garrett_at_astron.nl> 2011-04-21 13:03 >>>
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
some 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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Received on 2011-04-21 21:24:41