Some more full notes are in the sections below, but a brief summary of useful datasets is:
Sept 10 Superconducting Power Spectra /users/penarray/Diagnostics/sep10/super2006_09_10_14:02:44.fits ECCOSORB POTTING IN PLACE I THINK
Sep 11 -- beam measurement with chopper in lab -- /home/scratch/bmason/parlab/beam ECCOSORB POTTING IN PLACE I THINK
Sep 12 -- power spectra with a single good tuning and set of detector bias settings, variety of loads. main data in
/home/labdata/TPAR/sep12/Rcvr_PAR. Auxilliary data in /home/gbtlogs/par-detbias ECCOSORB POTTING IN PLACE I THINK
Dec 2006 Dark Data collected with brass plate in place of bandpass filter (at 300 mK). live in /home/scratch/pkorngut/NoiseVBias
Jan 2007 Dark Data similar to Dec 2006 dark data, but there is a series of scans. /home/scratch/pkorngut/NoiseData
March 2007-- Victory Dataset: aka "post-death", after the initial vibration mitigation on the PT405. This is archived on GB at /home/scratch/pkorngut/NoiseData/Postdeath ; a more complete & systematic such dataset is under Postdeath/PCdata (the short file is a cal file)
July/Aug 2007 -- it would be good to have
- PT407 with heatstrap2 (being the Postdeath heatstrap; heatstrap 1 being the Death heatstrap used prior to March 2007). /home/scratch/pkorngut/NoiseData/PostDeath/PT407/2007_07_10_14:44:53.fits
- PT407 data with heatstrap3, in the lab -- /home/scratch/pkorngut/NoiseData/PostDeath/PT407/2007_07_23_10:34:58.fits
* PT407 data with heatstrap3, on the telescope -- those we have! /home/labdata/TPAR_Aug11 and /home/gbtdata/TPAR_{09,11}, for instance.
I looked at one cal scan from TPAR_01 and one from TPAR_02 and found that by and large,
the pixels i would identify as unstable were consistent:
col row
4 3 *
4 2
4 6 *
5 0
6 5
2 3 *
2 0 *
1 4
1 3
I identified these by looking at the DAC plots. "*" indicates in addition, consistently have crazy anomalous signals (large maximum absolute deviations in comparison to typical SAE rms's of 15-30 counts)
Sep 10 -- superconducting power spectrum -- /users/penarray/Diagnostics/sep10/super2006_09_10_14:02:44.fits
Also, slide the absorber across the window in a set pattern (see diagram attached)
qcal=readparfits('/home/gbtdata/TPAR/Rcvr_PAR/2006_09_10_15:27:40.fits')
q=readparfits('/home/gbtdata/TPAR/Rcvr_PAR/2006_09_10_15:15:27.fits')
Shunt Resistance Values from the Superconducting johnson noise measurements, in ohms.
;IDL> print,rshunt[0:7,0:7]
; 0.000965792 0.00933001 0.00146571 6.88844 0.00183486 0.00172469 0.00142603 3.27291
; 0.000912460 0.00149841 0.00160556 6.96465 0.00165583 0.00189681 0.00139460 3.26813
; 0.00230803 0.00123597 0.00160815 6.89291 0.00168434 0.0119896 0.00126465 3.20921
; 0.00246464 0.00125361 0.00162230 7.12690 0.00169527 0.00177807 0.00150659 3.21868
; 0.00113462 0.00125729 0.00149759 6.89700 0.00166594 0.000579094 0.00138296 3.27118
; 0.00118428 0.00119946 0.00169652 6.90252 0.00177322 0.00119262 0.00136614 3.24217
; 0.00124462 0.00123787 0.00169382 6.83786 0.00162561 0.00186029 0.00141756 3.24024
; 0.00126105 0.00135550 0.00173893 6.91827 0.00189125 0.00204378 0.00132133 3.20331
Typical values are 1.1-1.7 milliOhms. Notable outliers are c1r0 (9.3 mOhm!), c0r2 and c0r3 (2.4 mOhm), c5r4 (0.6 mOhm). values in this table of order an ohm are bogus (columns or pixels that we didn't get good data on)
Sep 11 -- beam measurement with chopper in lab -- /home/scratch/bmason/parlab/beam
Sep 12 -- power spectra with a single good tuning and set of detector bias settings, variety of loads. main data in
/home/labdata/TPAR/sep12/Rcvr_PAR. Auxilliary data in /home/gbtlogs/par-detbias. notes attached, also:
; brass reflector, cal on
q=readparfits('/home/labdata/TPAR/sep12/Rcvr_PAR/2006_09_12_09:55:56.fits')
; brass reflector, cal off
q=readparfits('/home/labdata/TPAR/sep12/Rcvr_PAR/2006_09_12_09:59:42.fits')
; sky, cal off
q=readparfits('/home/labdata/TPAR/sep12/Rcvr_PAR/2006_09_12_10:02:26.fits')
; sky, cal on
q=readparfits('/home/labdata/TPAR/sep12/Rcvr_PAR/2006_09_12_10:04:46.fits')
; nitrogen, cal on
q=readparfits('/home/labdata/TPAR/sep12/Rcvr_PAR/2006_09_12_10:30:16.fits')
; nitrogen, cal off
q=readparfits('/home/labdata/TPAR/sep12/Rcvr_PAR/2006_09_12_10:32:23.fits')
; hot, cal on
q=readparfits('/home/labdata/TPAR/sep12/Rcvr_PAR/2006_09_12_11:38:11.fits')
; hot, cal off
q=readparfits('/home/labdata/TPAR/sep12/Rcvr_PAR/2006_09_12_11:41:07.fits')
; read firmware ramp and bias files
f=readfwfbrampfile('/home/gbtlogs/par-fwramp/2006_08_12_09:40:22.txt')
bbrass=readbiasfile('/home/gbtlogs/par-detbias/brassreflect2006_08_12_09:45:02.txt')
bsky=readbiasfile('/home/gbtlogs/par-detbias/cloudysky2006_08_12_10:11:25.txt')
bnitro=readbiasfile('/home/gbtlogs/par-detbias/nitrogen2006_08_12_10:22:35.txt')
bhot=readbiasfile('/home/gbtlogs/par-detbias/roomtemp2006_08_12_11:28:53.txt')
From this data, the raw cal response (in counts per cal) against the cold and hot loads respectively:
IDL> print,cgain
662.904 0.00000 687.737 0.00000 495.252 -561.569 624.167 0.00000
680.978 -684.890 548.631 0.00000 572.511 -537.448 731.703 0.00000
0.00000 0.00000 623.504 0.00000 571.932 0.00000 727.356 0.00000
0.00000 -742.142 666.842 0.00000 540.394 -493.889 730.750 0.00000
652.726 -671.869 539.885 0.00000 542.677 0.00000 708.159 0.00000
581.397 -735.449 559.615 0.00000 557.388 66.8260 686.466 0.00000
459.736 -534.925 504.923 0.00000 524.312 -528.641 637.947 0.00000
452.744 -562.716 506.862 0.00000 502.724 -297.654 623.488 0.00000
0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
IDL> print,gain
644.021 0.00000 668.158 0.00000 463.839 -534.950 604.339 0.00000
662.817 -666.174 528.799 0.00000 545.052 -509.362 722.862 0.00000
0.00000 0.00000 628.741 0.00000 555.012 0.00000 699.479 0.00000
0.00000 -683.018 642.898 0.00000 534.960 -483.893 680.353 0.00000
608.721 -660.490 526.244 0.00000 507.201 0.00000 667.080 0.00000
615.499 -693.011 540.085 0.00000 527.880 57.8926 668.474 0.00000
467.253 -514.802 485.878 0.00000 502.574 -488.942 608.953 0.00000
431.739 -534.209 497.153 0.00000 481.117 -43.6579 600.246 0.00000
0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
Here are the ratios:
IDL> print,cgain/gain
1.02932 -NaN 1.02930 -NaN 1.06772 1.04976 1.03281 -NaN
1.02740 1.02809 1.03750 -NaN 1.05038 1.05514 1.01223 -NaN
-NaN -NaN 0.991670 -NaN 1.03049 -NaN 1.03985 -NaN
-NaN 1.08656 1.03724 -NaN 1.01016 1.02066 1.07408 -NaN
1.07229 1.01723 1.02592 -NaN 1.06994 -NaN 1.06158 -NaN
0.944594 1.06124 1.03616 -NaN 1.05590 1.15431 1.02692 -NaN
0.983913 1.03909 1.03920 -NaN 1.04325 1.08119 1.04761 -NaN
1.04865 1.05336 1.01953 -NaN 1.04491 6.81788 1.03872 -NaN
Here are plots of some of the raw data.
- cal signal against hot load:
- cal signal against cold:
- cal signal against hot load, physical layout:
Notably unstable or bad pixels, and possible explanations, are:
- c0r2, c0r3, c1r0 (high Rs). c1r0 is way high--- factor of 8.
- c5r2, c5r4 (low Rs--- factor of 2-3)
- c1(r2,r4,r5); c2(r0,r3); c4(r3,r4,r5,r6) --- unexplained
- Good chopper measurements of many-detector time constants (strong signal; range of chop freqs; shutter signal fed into IX card)
-- BrianMason - 19 Sep 2006
Also here is a movie to watch using IDL
- download the file saturn_movie.dat and Brians scanmovie.pro
restore,'saturn_movie.dat'
.compile scanmovie.pro
scanmovie,saturn,crmask=cr,unitoff=mapping
Revision r1.8 - 21 Aug 2007 - 18:18 GMT - BrianMason
Parents: WebHome
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photo2.pdf 
hotcal.png 
