28 Aug
2013
28 Aug
'13
11:28 a.m.
Clem - the more I stare at those maps, the more
correlated they look.
The big, blue blobs at ra~-5 seem very much the same.
Well there are clearly correlation with Keck2012 also (as we already know from
"experiment jack" and B2xKeck2012 spectra). I am still bothered by the lack of
power in Keck2013 on the left side - but perhaps it is just chance.
Here is a puzzle I just noticed which I expect you can clear up: Go to B2,
real, deproj=none, type1=Q, type=map, jack=dk - we see enormous diff point
induced TtoPol leakage in the Q/U maps (which cleans up in jack=none due to
coadd of 180 deg complement angles, and also clean up if we switch to
deproj=dp).
Now select Keck2013 and rx=3 - which is B2 isn't it? Now there is no obvious
TtoPol. But the only difference observing wise is the presence of 90 deg
complements added to each half of the jack - but those shouldn't cancel diff
point leakage (at least not much). What is going on? Have the differential
pointing gone way down with transplant of B2 focal plane to Keck cryostat?
Clem
--
**********************************************************************
Clem Pryke - Associate Professor - Physics
University of Minnesota,
Room 313 Tate, 116 Church Street S.E. Minneapolis, MN, 55455
Tel: 612-624-7578 Fax: 612-624-4578 email: pryke(a)physics.umn.edu
**********************************************************************
28 Aug
28 Aug
12:13 p.m.
New subject: Keck 2013
Hi
From the 2013 far field beam maps, it does look like
the rx3 differential
pointing looks different from Bicep2. In the difference maps I
linked
below, I'm relatively sure the color scale is the same. Doing a comparison
has been on my list of things to do.
rx3 2013 Feb Uber chopper far field beam map:
http://bmode.caltech.edu/~spuder/keck_analysis_logbook/analysis/20130216_po…
Bicep2 Uber chopper beam map, Nov 2012:
http://bmode.caltech.edu/~spuder/analysis_logbook/analysis/20130610_elipgau…
Chin Lin
On Wed, Aug 28, 2013 at 11:28 AM, Clem Pryke <pryke(a)physics.umn.edu> wrote:
Clem - the
more I stare at those maps, the more correlated they look.
The big, blue blobs at ra~-5 seem very much the same.
Well there are clearly correlation with Keck2012 also (as we already know
from
"experiment jack" and B2xKeck2012 spectra). I am still bothered by the
lack of
power in Keck2013 on the left side - but perhaps it is just chance.
Here is a puzzle I just noticed which I expect you can clear up: Go to B2,
real, deproj=none, type1=Q, type=map, jack=dk - we see enormous diff point
induced TtoPol leakage in the Q/U maps (which cleans up in jack=none due to
coadd of 180 deg complement angles, and also clean up if we switch to
deproj=dp).
Now select Keck2013 and rx=3 - which is B2 isn't it? Now there is no
obvious
TtoPol. But the only difference observing wise is the presence of 90 deg
complements added to each half of the jack - but those shouldn't cancel
diff
point leakage (at least not much). What is going on? Have the differential
pointing gone way down with transplant of B2 focal plane to Keck cryostat?
Clem
--
**********************************************************************
Clem Pryke - Associate Professor - Physics
University of Minnesota,
Room 313 Tate, 116 Church Street S.E. Minneapolis, MN, 55455
Tel: 612-624-7578 Fax: 612-624-4578 email: pryke(a)physics.umn.edu
**********************************************************************
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1:12 p.m.
New subject: Keck 2013
Yep, as Chin-Lin says the difpoint has changed dramatically (and has
gone way down) for D2 in B2 vs. in Keck2013 rx3. We don't understand
it. It is at least consistent with our best working model that
near-field mismatch is necessary but not sufficient to produce far-field
mismatch (i.e. the optics play a role in translating the former into the
latter).
J
On 8/28/13 12:13 PM, Chin Lin Wong wrote:
Hi
From the 2013 far field beam maps, it does look like the rx3
differential pointing looks different from Bicep2. In the difference
maps I linked below, I'm relatively sure the color scale is the same.
Doing a comparison has been on my list of things to do.
rx3 2013 Feb Uber chopper far field beam map:
http://bmode.caltech.edu/~spuder/keck_analysis_logbook/analysis/20130216_po…
Bicep2 Uber chopper beam map, Nov 2012:
http://bmode.caltech.edu/~spuder/analysis_logbook/analysis/20130610_elipgau…
Chin Lin
On Wed, Aug 28, 2013 at 11:28 AM, Clem Pryke <pryke(a)physics.umn.edu
<mailto:pryke@physics.umn.edu>> wrote:
--
___________________________________________________________________
John Kovac jmkovac(a)cfa.harvard.edu
Associate Professor, Harvard University Astronomy Department
160 Concord Ave rm 310, Cambridge MA 02138, 617-496-0611
Clem - the more I stare at those maps, the more
correlated they look.
The big, blue blobs at ra~-5 seem very much the same.
Well there are clearly correlation with Keck2012 also (as we already
know from
"experiment jack" and B2xKeck2012 spectra). I am still bothered by
the lack of
power in Keck2013 on the left side - but perhaps it is just chance.
Here is a puzzle I just noticed which I expect you can clear up: Go
to B2,
real, deproj=none, type1=Q, type=map, jack=dk - we see enormous diff
point
induced TtoPol leakage in the Q/U maps (which cleans up in jack=none
due to
coadd of 180 deg complement angles, and also clean up if we switch to
deproj=dp).
Now select Keck2013 and rx=3 - which is B2 isn't it? Now there is no
obvious
TtoPol. But the only difference observing wise is the presence of 90 deg
complements added to each half of the jack - but those shouldn't
cancel diff
point leakage (at least not much). What is going on? Have the
differential
pointing gone way down with transplant of B2 focal plane to Keck
cryostat?
Clem
--
**********************************************************************
Clem Pryke - Associate Professor - Physics
University of Minnesota,
Room 313 Tate, 116 Church Street S.E. Minneapolis, MN, 55455
Tel: 612-624-7578 <tel:612-624-7578> Fax: 612-624-4578
<tel:612-624-4578> email: pryke(a)physics.umn.edu
<mailto:pryke@physics.umn.edu>
**********************************************************************
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2 comments
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participants (3)
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Chin Lin Wong -
Clem Pryke -
John Kovac