Medium Resolution Settings for CD22 flights

N. Rangwala's requested medium mode settings have particularly high fluxes. We will have to take special measures to observe them while staying efficient.

The slit length needs to be at least 60" long in order to nod on source. This is about 300 pixels. The angle of the spectrum to the detector rows is arctan(0.095), so that an additional ~96 rows must be read out to get the slit length specified. Therefore, we'll work with 400 rows for these settings.
The command is:
1 1 152 200 0 1032 400 ectpat
1 ectgopat
(0 ectgopat returns to 1032x1024 full frames)

Setting 1: 
NGC 253 S(1). med.  2.4" wide slit.  wn0 = 586.55 cm-1.  order 3.  nod on slit for stepped map as above.

tested setup: 

587.0 cm-1, order 3, 18a, decker open, 1.9" slit (change from request)

Frametime = 0.5 sec, detector bias= 1.0 V (DC12, VDET= -3.5 V), OTPAT: D0 or D0 T0

Caption: 587cm-1, 3rd order, looking at room (295K); gas cell with 584.71 cm-1 H2O line.

Data must be taken with OTPAT: D0 (or D0 T0). Probably with many repeats, so that we spend a reasonable time per step. There is no detectable image difference between D0 or D0 T0. We will have to make sure 0.5s D0s save to the computer without glitches. 

Here is the histogram of pixel values on the room (295K). I subtracted the data frames from a D0 frame with the lens mirror in (dark). 

Histogram of pixel values for 587cm-1,3rd, looking at room.
We expect 1.5x less flux on 260K blackbody.

Using mplanck.pro, we should expect the 260K blackbody to have 1.5x less flux than the 295K room.

Setting 2: 
NGC 6240 S(1).  med.   2.4" wide slit.  wn0 = 573.00 cm-1 order 3 nod on slit.

tested setup: 

573.0 cm-1, order 3, 18a, decker open, 1.9" slit (change from request)

Frametime = 0.5 sec, detector bias= 1.0 V (DC12, VDET= -3.5 V), OTPAT: D0 or D0 T0

 

Caption: 573cm-1, 3rd order, looking at room (295K); gas cell with 571.29 cm-1 H2O line.

As above, this must be taken with OTPAT: D0s. 

Here is the histogram of pixel values on the room (295K), subtracted from a D0 frame with the lens mirror in (dark). 

Histogram of pixel values for 573cm-1,3rd, looking at room.
We expect 1.5x less flux on 260K blackbody.

Setting 3: 
NGC 253 S(2).  med.  2.4" wide slit.  wn0 = 813.74 cm-1.  order 4.  nod on slit for stepped map.  Plan is full slit width steps on either side of start position.  9 total steps

tested setup: 

814.0 cm-1, order 4, OCLI S, decker open, 1.9" slit (change from request)

Frametime = 0.5 sec, detector bias= 1.0 V (DC12, VDET= -3.5 V), OTPAT: D0 or D0 T0

OTPAT: D0, 814cm-1, 4th order, looking at room.
There are no water lines in this setting, so I do not show the gas cell spectrum.

This must be taken with OTPAT D0. Really counting on the 1.71x lower factor when we are using the 260K blackbody. 

Here is the histogram of pixel values on the room (295K), subtracted from a D0 frame with the lens mirror in (dark). 

Histogram of pixel values for 573cm-1,3rd, looking at room.
We expect 1.71x less flux on 260K blackbody.

Hi-med settings for CD22 flights

Some of the instrument settings required for the science in the Aug 2015 flight series have very high flux. We have to choose the best way to handle the flux level from the blackbody by : reducing the frame time (default 1.0s), selecting a narrower slit or using subarray mode.

The goal is to get the peak flux of the brightest parts of the order to ~8000 DN (3000 DN below 11000 dark level).

Setting 1

wn0 = 811.32 cm-1, order 4, high-med, Slit 6 (3.2")

for 03_0065 (Rangwala) NGC 1068 S(2)

instrument configuration

slit6, ddeg ~36.5, OCLI S, edeg=47.798 deg

811.3 cm-1, 4th order, looking at 295K room

For frametime=1.0 we get >6500 counts in N0 D0

For frametime=0.5 we get 4000 counts in N0 D0

Histogram of net pixel DN (11000-lastframe) for Frametime=1.0 (red) and Frametime=0.5s (green)

The scaling from 295K room to 260K is a factor or 1.72.

Solution: FT=0.65 sec, SLIT6, N0 D0

We want to keep slit6 because the sources are so faint. Straight Ds might compromise the data quality. Not known yet, so too risky. 

Also, maybe we can actually linearize up to 3500? Allowing us use a longer frametime.

Setting 2

wn0 = 584.8 cm-1, order 3, high-med, Slit 6 (3.2")

for 03_0065 (Rangwala) NGC 1068 S(1)

instrument configuration

slit6, ddeg=41.567, 18a, edeg=50.561

584.8 cm-1, 3rd order, looking at 295K room

Histogram of net pixel DN (11000-lastframe) for Frametime=1.0(red), Frametime=0.5 (green)

For frametime=1.0 we get 5600 counts in N0 D0

For frametime=0.5 we get 3000 counts in N0 D0

The scaling from 295K room to 260K is a factor or 1.5.

Solution: FT=0.75 sec, SLIT6, N0 D0

Setting 3:

wn0 = 1888.06 cm-1, 11th order, (03_0067, Goto).  2.4" wide slit (slit5)

instrument configuration

slit5, ddeg=32.95(+), N05340, edeg=62.0191

OTPAT: ~3000DN for N3 S22 N2 D0 while looking at room. Estimate 108 seconds needed on 260 K blackbody.

1888.0 cm-1, 11th order, slit5, gas cell with H2O lines

Setting 4 (GTO):

wn0 = 1778 cm-1, 10th order

instrument configuration

slit TBD, ddeg=32(+), BBP5500_6000, edeg=58.295

1778 cm-1, 10th order, gas cell with H2O lines

Setting 5 (GTO):

wn0 = 1748 cm-1, 10th order

instrument configuration

slit TBD, ddeg=32.7, BBP5500_6000, edeg=60.020

Setting 5 (GTO): 

wn0 = 1620 cm-1, 9th order

instrument configuration

slit TBD, ddeg=32.6, Reading 6.2um, edeg=57.120

Quick timing from Feb/Mar syslogs

Using Mike's CSV file from the syslogs from Feb/Mar, I looked a little at the numbers.  The CSV is in EE/analysis/cd21/timing/ along with my journal file and Mike's python.

DONE was returned 25% of the time faster than 5.156 seconds, 50% of the time faster than 6.281 seconds, and 75% of the time faster than 7.828 seconds.

We had a time out of 4 seconds.  Comparing the total of all the waits (what would have been elapsed time with no time out) and what we should have experienced (any wait longer than 4 seconds gets replaced with 4.0), find that

• total of all waits was 405 minutes over 5 flights
• total of our time-out adjusted waits was 222 minutes
• Difference is roughly 3 hours of waiting time.
• without a time out, the waiting time was 1.82X longer

Labeled Filter and Decker Wheel for CD22

Filter Wheel

F1 OPEN
F2 BBP5500+ CaF2
F3 18a + ZnSe
F4 Reading 6.2 + MgF2
F5 N04679+MgF2
F6 N07466+CaF2
F7 BP14100
F8 Soifer
F9 BP4990 + MgF2 (from ISP)
F10 BP6000 + MgF2
F11 OCLI S + BaF2
F12 N05340 + MgF2 (From ISP)

Numbers F 1-12 are etched in wheel underneath retaining plates.


Decker Wheel

D1 BP13465 + BaF2
D2 N07053 + CaF2
D3 BP6600+MgF2 (ISP)
D4 BBP5030+MgF2 (ISP)

Decker wheel filters loaded for CD22

Numbers for D 1-4, scratched into Al of decker wheel