Re: [Bicep2-list] [keckarray] Keck Pole update and warmup plan 11/20 -- NO telecon Thanksgiving day
21 Nov
2012
21 Nov
'12
12:03 p.m.
Hi Zak, Colin, Jon, Chin Lin, Howard, and Grant:
Thanks for sending updates yesterday and for calling in to the B2
telecon (until we lost you). Clem is out and due to the holiday we'll
skip this week's Keck telecon. I'm in the office today and Friday so
you can call me at 617-496-0611 if you'd like to check on on anything.
Obviously from your report you guys are working hard, and your plan
below (and as discussed yesterday) sounds good. Here are a few comments
that may have come after you dropped off the call:
2) B2 will not be very productive between the 20th and 23rd because they are ready for
either our mast or the RPS. This should be fine as we can catch up a lot on B2 in short
order.
On the call yesterday we requested two more sets of B2 uber-chopper maps
that you can do during this time:
a) DK = +/-45 deg rotation (may need to increase EL range). This is
a check of which vertical/horizontal near sidelobe features seen in the
DK=0,90,180,270 maps rotate with the instrument.
b) stop the uber chopper down to an aperture size similar to ze
choppa (or go back to ze choppa). This is because Randol reports some
pixels still exhibit non-linear response to the brighter uber-chopper at
all the biases tried, and for those pix we can main beam parameters
directly comparable with last season's.
We discussed whether to do (a) with the full strength or stopped-down
uber-chopper, but the meeting notes do not record what we agreed. I
think Randol preferred stopped-down (correct if wrong).
3) B2 will have the RPS from the 23rd for 3 days or more, and then can take the pin switch
out and use it in the noise source for far sidelobes.
4) Because of point 3), Keck cannot do any mapping for the 23rd-30th unless we put the far
field flat on to do uber-chopper. not really a big priority. Instead, Keck will probably
start far sidelobe mapping when B2 is done on the 30th.
It sounds like Keck will be idle Nov 27-30, due to lack of a second BNS
source for simultaneous far sidelobe mapping (unless some of the
lower-power B2 far sidelobe maps are done with the uber chopper, which
we may want to consider).
But I imagine a few days of Keck beam measurement down-time would be
fine, given how busy you guys must be. If you have follow-up ideas for
PT-excess noise this period may be a chance to pick that up again, at
your leisure.
Jon K: on B2 thermal characterization, Darren and I were wondering how
close we are to closing out those measurements. Have you analyzed the
PID bandwidth schedules you've taken and been able to draw/post
conclusions? He also mentioned there were a couple outstanding
follow-up suggestions for thermal filter measurements. I think the
thermal measurement thread is nearly done, but it will be good to hear
your wrap-up of it next week.
good luck to you all,
John
On 11/20/12 3:14 AM, Staniszewski, Zachary (Guest) wrote:
Hi All,
We plan on finishing RPS maps up and warming up the two receivers very soon, so I
wanted to give both an update and our plan before we pull the plug in a couple days.
Short story on the RPS is that we had grounding problems where the mast would charge
and shock and kill the pin switch. We hunted this problem down and fixed it after the
second incident. Replaced the pin switch with one on loan from SPT. Spares are on their
way.
Our main goal is to run the RPS schedule at 5 dk angles before warming up, and also a
couple dk angles of moon observations. We have completed the moon man observations, and 2
of the 5 RPS schedules. We are on track for finishing these measurements on the 23rd which
is just enough time to warm up RX3 and RX4, get tiles out, and FPUs into Zak's hands
to take out the 29th.
The implications of this are follows;
1) We will have the RPS data in hand for all receivers. Also the necessary moon data.
2) B2 will not be very productive between the 20th and 23rd because they are ready for
either our mast or the RPS. This should be fine as we can catch up a lot on B2 in short
order.
3) B2 will have the RPS from the 23rd for 3 days or more, and then can take the pin
switch out and use it in the noise source for far sidelobes.
4) Because of point 3), Keck cannot do any mapping for the 23rd-30th unless we put the
far field flat on to do uber-chopper. not really a big priority. Instead, Keck will
probably start far sidelobe mapping when B2 is done on the 30th.
Random notes before listing our proposed schedule for the next week.
a) Jamie T. left, Grant and Howard arrived
b) Grant and Howard will check out the wire bonder tomorrow
c) Chin Lin will verify that the moon man maps look good. Already verified that one dk
angle looks good.
d) FTS has been pulled forward from CHC and could arrive by the end of the week
e) Zak has Steele working on mast extension for Keck's far sidelobe mapping
f) Colin made a post is working hard on RPS analysis
Proposed schedule to finish measurements, warm up, and get FPU out on time. Other things
will be happening, but this is the stuff relevant to getting the FPUs out.
20th, Tues: RX2 RPS
21st, Wed : RX0 RPS
22nd, Thu : RX1 RPS, start warming up RX3 and RX4 as they are not on mirror, do some RGA
23rd, Fri : FFFlat off today because Saturday and Sunday will be hard to find help as it
is Xgiving
24th, Sat : Continue warming up RX3/RX4 and pull off back side electronics
25th, Sun : Warm up
26th, Mon : Take RXs out of the mount and start taking the cryostats apart
27th, Tue : Take RXs apart, getting the FPUs out
28th, Wed : Grant, Howard do tile removing
29th, Thu : Zak leaves with the two FPUs
_______________________________________________
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KeckArray(a)lists.stanford.edu
https://mailman.stanford.edu/mailman/listinfo/keckarray
--
___________________________________________________________________
John Kovac jmkovac(a)cfa.harvard.edu
Assistant Professor, Astronomy and Physics, Harvard University
160 Concord Ave rm 310, Cambridge MA 02138, 617-496-0611
21 Nov
21 Nov
12:14 p.m.
New subject: [keckarray] Keck Pole update and warmup plan 11/20 -- NO telecon Thanksgiving day
On the call yesterday we requested two more sets of B2
uber-chopper maps
that you can do during this time:
a) DK = +/-45 deg rotation (may need to increase EL range). This is
a check of which vertical/horizontal near sidelobe features seen in the
DK=0,90,180,270 maps rotate with the instrument.
b) stop the uber chopper down to an aperture size similar to ze
choppa (or go back to ze choppa). This is because Randol reports some
pixels still exhibit non-linear response to the brighter uber-chopper at
all the biases tried, and for those pix we can main beam parameters
directly comparable with last season's.
We discussed whether to do (a) with the full strength or stopped-down
uber-chopper, but the meeting notes do not record what we agreed. I
think Randol preferred stopped-down (correct if wrong).
For a) I'd prefer the unattenuated chopper at the high bias settings
(7_ffflat_mapo_28_xxx.sch). For b) the old chopper is preferred since you can run it at a
faster chop rate and faster slews/shorter schedules, but do what's easiest for you
guys.
3) B2 will have the RPS from the 23rd for 3 days or
more, and then can take the pin switch out and use it in the noise source for far
sidelobes.
4) Because of point 3), Keck cannot do any mapping for the 23rd-30th unless we put the
far field flat on to do uber-chopper. not really a big priority. Instead, Keck will
probably start far sidelobe mapping when B2 is done on the 30th.
It sounds like Keck will be idle Nov 27-30, due to lack of a second BNS
source for simultaneous far sidelobe mapping (unless some of the
lower-power B2 far sidelobe maps are done with the uber chopper, which
we may want to consider).
But I imagine a few days of Keck beam measurement down-time would be
fine, given how busy you guys must be. If you have follow-up ideas for
PT-excess noise this period may be a chance to pick that up again, at
your leisure.
Jon K: on B2 thermal characterization, Darren and I were wondering how
close we are to closing out those measurements. Have you analyzed the
PID bandwidth schedules you've taken and been able to draw/post
conclusions? He also mentioned there were a couple outstanding
follow-up suggestions for thermal filter measurements. I think the
thermal measurement thread is nearly done, but it will be good to hear
your wrap-up of it next week.
good luck to you all,
John
On 11/20/12 3:14 AM, Staniszewski, Zachary (Guest) wrote:
Hi All,
We plan on finishing RPS maps up and warming up the two receivers very soon, so I wanted
to give both an update and our plan before we pull the plug in a couple days.
Short story on the RPS is that we had grounding problems where the mast would charge and
shock and kill the pin switch. We hunted this problem down and fixed it after the second
incident. Replaced the pin switch with one on loan from SPT. Spares are on their way.
Our main goal is to run the RPS schedule at 5 dk angles before warming up, and also a
couple dk angles of moon observations. We have completed the moon man observations, and 2
of the 5 RPS schedules. We are on track for finishing these measurements on the 23rd which
is just enough time to warm up RX3 and RX4, get tiles out, and FPUs into Zak's hands
to take out the 29th.
The implications of this are follows;
1) We will have the RPS data in hand for all receivers. Also the necessary moon data.
2) B2 will not be very productive between the 20th and 23rd because they are ready for
either our mast or the RPS. This should be fine as we can catch up a lot on B2 in short
order.
3) B2 will have the RPS from the 23rd for 3 days or more, and then can take the pin
switch out and use it in the noise source for far sidelobes.
4) Because of point 3), Keck cannot do any mapping for the 23rd-30th unless we put the
far field flat on to do uber-chopper. not really a big priority. Instead, Keck will
probably start far sidelobe mapping when B2 is done on the 30th.
Random notes before listing our proposed schedule for the next week.
a) Jamie T. left, Grant and Howard arrived
b) Grant and Howard will check out the wire bonder tomorrow
c) Chin Lin will verify that the moon man maps look good. Already verified that one dk
angle looks good.
d) FTS has been pulled forward from CHC and could arrive by the end of the week
e) Zak has Steele working on mast extension for Keck's far sidelobe mapping
f) Colin made a post is working hard on RPS analysis
Proposed schedule to finish measurements, warm up, and get FPU out on time. Other things
will be happening, but this is the stuff relevant to getting the FPUs out.
20th, Tues: RX2 RPS
21st, Wed : RX0 RPS
22nd, Thu : RX1 RPS, start warming up RX3 and RX4 as they are not on mirror, do some RGA
23rd, Fri : FFFlat off today because Saturday and Sunday will be hard to find help as it
is Xgiving
24th, Sat : Continue warming up RX3/RX4 and pull off back side electronics
25th, Sun : Warm up
26th, Mon : Take RXs out of the mount and start taking the cryostats apart
27th, Tue : Take RXs apart, getting the FPUs out
28th, Wed : Grant, Howard do tile removing
29th, Thu : Zak leaves with the two FPUs
_______________________________________________
KeckArray mailing list
KeckArray(a)lists.stanford.edu
https://mailman.stanford.edu/mailman/listinfo/keckarray
--
___________________________________________________________________
John Kovac jmkovac(a)cfa.harvard.edu
Assistant Professor, Astronomy and Physics, Harvard University
160 Concord Ave rm 310, Cambridge MA 02138, 617-496-0611
_______________________________________________
Bicep2-list mailing list
Bicep2-list(a)lists.fas.harvard.edu
https://lists.fas.harvard.edu/mailman/listinfo/bicep2-list 
4:18 p.m.
New subject: [keckarray] Keck Pole update and warmup plan 11/20 -- NO telecon Thanksgiving day
After the meeting yesterday, we spent some time stepping down the power of
the uber-chopper and are currently integrating on it. I'm not sure what
the status of "Ze choppa" is but I'll ask Colin/Zak. After this schedule
completes (and the data looks ok), I can remove the "attenuator" and take
queue up schedule a).
On Wed, Nov 21, 2012 at 9:14 AM, Randol Aikin <rwa(a)caltech.edu> wrote:
_______________________________________________
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On the call
yesterday we requested two more sets of B2 uber-chopper maps
that you can do during this time:
a) DK = +/-45 deg rotation (may need to increase EL range). This is
a check of which vertical/horizontal near sidelobe features seen in the
DK=0,90,180,270 maps rotate with the instrument.
b) stop the uber chopper down to an aperture size similar to ze
choppa (or go back to ze choppa). This is because Randol reports some
pixels still exhibit non-linear response to the brighter uber-chopper at
all the biases tried, and for those pix we can main beam parameters
directly comparable with last season's.
We discussed whether to do (a) with the full strength or stopped-down
uber-chopper, but the meeting notes do not record what we agreed. I
think Randol preferred stopped-down (correct if wrong).
For a) I'd prefer the unattenuated chopper at the high bias settings
(7_ffflat_mapo_28_xxx.sch). For b) the old chopper is preferred since you
can run it at a faster chop rate and faster slews/shorter schedules, but do
what's easiest for you guys.
3) B2 will have the RPS from the 23rd for 3 days
or more, and then can
take the pin switch out and use it in the noise source for
far sidelobes.
4) Because of point 3), Keck cannot do any
mapping for the 23rd-30th
unless we put the far field flat on to do uber-chopper.
not really a big
priority. Instead, Keck will probably start far sidelobe mapping when B2 is
done on the 30th.
It sounds like Keck will be idle Nov 27-30, due to lack of a second BNS
source for simultaneous far sidelobe mapping (unless some of the
lower-power B2 far sidelobe maps are done with the uber chopper, which
we may want to consider).
But I imagine a few days of Keck beam measurement down-time would be
fine, given how busy you guys must be. If you have follow-up ideas for
PT-excess noise this period may be a chance to pick that up again, at
your leisure.
Jon K: on B2 thermal characterization, Darren and I were wondering how
close we are to closing out those measurements. Have you analyzed the
PID bandwidth schedules you've taken and been able to draw/post
conclusions? He also mentioned there were a couple outstanding
follow-up suggestions for thermal filter measurements. I think the
thermal measurement thread is nearly done, but it will be good to hear
your wrap-up of it next week.
good luck to you all,
John
On 11/20/12 3:14 AM, Staniszewski, Zachary (Guest) wrote:
> Hi All,
> We plan on finishing RPS maps up and warming up the two receivers very
soon,
so I wanted to give both an update and our plan before we pull the
plug in a couple days.
> Short story on the RPS is that we had
grounding problems where the
mast would charge and shock and kill the pin switch.
We hunted this problem
down and fixed it after the second incident. Replaced the pin switch with
one on loan from SPT. Spares are on their way.
> Our main goal is to run the RPS schedule at
5 dk angles before warming
up, and also a couple dk angles of moon observations. We
have completed the
moon man observations, and 2 of the 5 RPS schedules. We are on track for
finishing these measurements on the 23rd which is just enough time to warm
up RX3 and RX4, get tiles out, and FPUs into Zak's hands to take out the
29th.
> The implications of this are follows;
> 1) We will have the RPS data in hand for all receivers. Also the
necessary
moon data.
> 2) B2 will not be very productive between the
20th and 23rd because
they are ready for either our mast or the RPS. This should be
fine as we
can catch up a lot on B2 in short order.
> 3) B2 will have the RPS from the 23rd for 3
days or more, and then can
take the pin switch out and use it in the noise source
for far sidelobes.
> 4) Because of point 3), Keck cannot do any
mapping for the 23rd-30th
unless we put the far field flat on to do uber-chopper.
not really a big
priority. Instead, Keck will probably start far sidelobe mapping when B2 is
done on the 30th.
>
> Random notes before listing our proposed schedule for the next week.
> a) Jamie T. left, Grant and Howard arrived
> b) Grant and Howard will check out the wire bonder tomorrow
> c) Chin Lin will verify that the moon man maps look good. Already
verified
that one dk angle looks good.
> d) FTS has been pulled forward from CHC and
could arrive by the end of
the week
> e) Zak has Steele working on mast extension
for Keck's far sidelobe
mapping
> f) Colin made a post is working hard on RPS
analysis
>
> Proposed schedule to finish measurements, warm up, and get FPU out on
time.
Other things will be happening, but this is the stuff relevant to
getting the FPUs out.
>
> 20th, Tues: RX2 RPS
> 21st, Wed : RX0 RPS
> 22nd, Thu : RX1 RPS, start warming up RX3 and RX4 as they are not on
mirror,
do some RGA
> 23rd, Fri : FFFlat off today because Saturday
and Sunday will be hard
to find help as it is Xgiving
> 24th, Sat : Continue warming up RX3/RX4 and
pull off back side
electronics
> 25th, Sun : Warm up
> 26th, Mon : Take RXs out of the mount and start taking the cryostats
apart
27th, Tue
: Take RXs apart, getting the FPUs out
28th, Wed : Grant, Howard do tile removing
29th, Thu : Zak leaves with the two FPUs
_______________________________________________
KeckArray mailing list
KeckArray(a)lists.stanford.edu
https://mailman.stanford.edu/mailman/listinfo/keckarray
--
___________________________________________________________________
John Kovac jmkovac(a)cfa.harvard.edu
Assistant Professor, Astronomy and Physics, Harvard University
160 Concord Ave rm 310, Cambridge MA 02138, 617-496-0611
_______________________________________________
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https://lists.fas.harvard.edu/mailman/listinfo/bicep2-list
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2 comments
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participants (3)
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John Kovac -
Jon Kaufman -
Randol Aikin