RxH3 Observations
RxH3 Observations and other tests
November 2007
RxH3 successfully used to obtain pointing offsets after SMU was returned
into the telescope for repair. Small maps were made (stdMap 7 and smaller).
13 October 2007
160 GHz 16 freqs map 20071013-020024. Rms 22.3 micron, the best measured
with RxH3 until now!
10 October 2007
Adjustment based on 20070924-015944.
4 October 2007
Previous map confirmed by 20071004-000645, rms 25.4 micron. Thermal
stabilization of RxH3 problematic because cabin is much colder at night
than before the shutdown due to removal of cabin door and RxB3.
24 September 2007
20070924-015944 first new nighttime 160 GHz map. Rms 25.7 micron.
30 August 2007
Until this date there were software and Eurotherm problems which prevented
obtaining maps. On this date the first new 80 GHz map was obtained
(20070830-175217). The rms was 31.1 micron.
12 April 2007
Eurotherm is burned and a replacement will be ordered. There are also problems
with the DRAMA software.
3 April 2007
RxH3 turned on in telescope. Eurotherm does not appear to be regulating the
plate temperature.
20 March 2007
RxH3 returned to cabin.
24 March 2006
Eurotherm checked in laboratory - it appears to be ok (see fault 20050830.003)
27 October 2005
RxH3 removed from cabin to make place for AzTEC (and
SCUBA-2). Will be reinstalled at position of RxB3 in 2006.
19 September 2005
20050919-004954 80 GHz 16 freqs map in bad (tau 0.38) but very stable weather.
Equivalent 160 GHz rms 26.8 micron with no systemativ deviations.
Waiting for good 160 GHz map, but all attempts (on several dates) after this
failed because plate and/or Gunn temperature were out of range due to broken Eurotherm.
12 September 2005
20050912-025747. 160 GHz 16 freqs map. tau about 0.1. Map is ok, but shows rather large systematic errors
in some sectors.
Need to be confirmed before adjusting dish.
7 September 2005
20050907-005123. 80 GHz 16 freqs. map. Test map with reverse 1. Map ok, but with stripes due to reverse?
Why not the problems of 20050724? After ACSIS tests with reboot of SMUT?
29 August 2005
Eurotherm heater indicates error and is probably broken
(see fault 20050830.003). A spare has been sent.
14 August 2005
20050814-015019. 80 GHz 16 freqs map. Same problem as on 20050724, but in Azi and Elv.
20050814-042214. 160 GHz 16 freqs map. Same problem as on 20050724, but in Azi and Elv.
27 July 2005.
20050727-021529. 80 GHz 16 freqs map. Same problem as on 20050724.
20050727-072516, 20050727-081219, 20050727-090535. Different 80 GHz maps with tests of SMU offsets.
Maps ok, but noisy because dish heated. Why no phase changes??
24 July 2005.
20050724-021529. 160 GHz 16 freqs map. Map shows large phase changes (wrapping) over dish in elevation.
Possibly because new SMU electronics used putting the SMU at wrong position? Pointing errors (due to model based on RxA3 instead of SCUBA).
4 July 2005.
20050704-233528. 160 GHz 16 freqs map. Same problem, same solution, but map is
good (rms 24 micron). In future map time signal cable should be swapped with
ACSIS one at mount computer.
1 July 2005.
20050701-015154. 160 GHz 16 freqs map. Time signal disturbed; map can be reduced by fixing the number of points (con.grid_npts) to 256. However map not very good, probably because of atmosphere.
26 June 2005. After solving these errors an 80 GHz testmap (20050626-082528) wascompleted without problems.
26 May 2005, 19 June 2005
Attempts to do holography failed, because of problems with on-source pulse (due to modifitions for ACSIS), errors in the script (testing of new SMU version),
and a bumped mirror of the reference signal (above SCUBA).
26 May 2005
Attempts to do holography failed, probably because of problems with on-source pulse (due to modifitions for ACSIS).
20 April 2005
Two 80 GHz maps at beginning and end of night (with sun heating the dish). 20050420-083335 and 20050420-172845 (tau 0.05). A difference map clearly shows bending of the panels.
Earlier that week holography forgotten by TSS; later overridden because of grade 1 weather.
13 February 2005
8h HST fans in cabin centerbeams turned on. Hope is to decrease temperature
difference changes between centerbeams and rest of telescope structure.
20050213-173829 80 GHz 16 freqs map. Tau 0.03-0.04.
20050213-205300 80 GHz 16 freqs map.
20050213-214437 160 GHz 16 freqs map.
26 January 2005
20050126-014223 160 GHz 16 freqs map. Tau 0.05. Shows larger rms than on
20050119. RxA3i again on - can this explain this?
19 January 2005
20050119-230706 160 GHz 16 freqs map. Tau about 0.3, but quality good!!!
RxA3i was turned off at this time, so less heat in cabin?
19 December 2004
20041219-235811 160 GHz 16 freqs map. Tau 0.13 - 0.15; map shows significant
coma in elevation, which I don't trust. SMU offset?
8 December 2004
During day repair of fans and insulation around center beams in cabin. Fans
remain turned off. This repair possibly affects surface.
20041209-004350 160 GHz 16 freqs map. Tau 0.12 - 0.10; map shows stripes and
arcs; not usable.
20041209-022652 80 GHz 16 freqs map. Tau 0.10; map ok, but rms higher than
expected due to above changes.
17 November 2004
20041117-211625 80 GHz 16 freqs map (tau 0.045)
20041118-010140 160 GHz 16 freqs map (tau 0.045)
Adjustment based on average of 20041111 and 20041118 maps on 20041201.
11 November 2004
Seven 80 GHz 16 freqs maps between 171908 and 221936 to study changes
in the surface (tau 0.12 - 0.06)
20041111-23095 80 GHz 16 freqs map with reverse=1; shows unexplained
symmetric systematic errors.
20041111-234518 160 GHz 16 freqs map - tau 0.06
9 September 2004
20040909-015400 80 GHz 16 freqs map
20040909-024418 160 GHz 16 freqs map - tau 0.14 - 0.12
8 August 2004
20040808-224129 80 GHz 16 freqs map
20040808-234534 160 GHz 16 freqs map - tau 0.08 - 0.09
11 July 2004
20040712-001239 160 GHz 16 freqs map. (tau 0.07, rms 24.3 micron).
16 June 2004
Seven 80 GHz 16 freqs map between 173629 and 224347 to study changes in the
surface (tau 0.16 -> 0.12).
20040616-233344 160 GHz 16 freqs map (rms 25.2 micron).
15 June 2004
20040616-011557 80 GHz 16 freqs map (tau 0.10).
12 June 2004
20040613-013630 80 GHz 16 freqs map (tau 0.10).
9 June 2004
20040610-011851 80 GHz 16 freqs map (tau 0.06).
6 June 2004
20040607-024103 80 GHz 16 freqs map (tau 0.08).
5 June 2004
20040606-012607 80 GHz 16 freqs map (tau 0.06).
27 May 2004
20040528-003722 80 GHz 16 freqs map. Check to see if nothing went wrong
(tau 0.10). Also start surface monitoring.
24 May 2004
20040524 16h54 adjustment based on 20040428-235444
28 April 2004
20040428-223803 80 GHz 16 freqs map
20040428-235444 160 GHz 16 freqs map (tau 0.10 -> 0.08; rms 28.7 micron)
Scan reversal test failed.
24 April 2004
Seven 80 GHz 16 freqs maps in between 174409 and 224519 to study changes in
the surface (tau about 0.13). First some problem with new TCS.
20040424-233514 160 GHz 16 freqs map for comparison (rms 26.9); adjustment
still not possible.
Results of analysis are shown
here
20 March 2004
In mean time holography plagued by bad weather.
20040320-003429 160 GHz 16 freqs map (rms 26.3 micron; tau 0.13). Attempts to
do an adjustment based on this map failed because of problems with the
adjuster micro and programs (would not boot, faults with writing NVRAM
adjuster data).
27 January 2004
20040127-174238 80 GHz test map - SMU position is now correct. Tau 0.21.
6 January 2004
Made six 80 GHz 16 freqs maps between 180506 and 221630. Aim was to study
changes in the surface during a shift. However had to give priority to
check SMU tilt position which correction was not applied to RxH3 after repair
(as well as to all other non-bsw observations).
Had to try software commands and maps were made with different tilts and
therefore are not well comparable. See pointing offsets in logs.
Very good weather (tau about 0.05).
22 December 2003
Since October several surface shifts could not be used due to bad weather.
20031222-014018 80 GHz 16 freqs map. Shows increased rms (like all 80 GHz maps
before), 31.9 micron due to incorrect masking of shadows of SMU support
legs.
20031222-023408 160 GHz 16 freqs map, tau_cso 0.07 (stable). rms 26 micron, rather large deviations in outer parts of sectors 3 to 5.
Boards of SMU electronics were removed in November for repair, so no adjustmentspossible at this moment.
6 October 2003
20031006-015503 160 GHz 16 freqs map, tau_cso 0.104 (stable).
7 September 2003
20030907-032809 160 GHz 16 freqs map, tau_cso 0.05 (stable). No coma visible
in this very good map - rms is 25.2 micron.
19 August 2003
20030819-032635 160 GHz 16 freqs map, tau_cso 0.07 (stable). Also this map
shows some increased coma in Y, but much less than the previous one. Rms is
26.7 micron.
On 26 August I. Coulson applied receiver independendt focus corrections of
-0.19 mm (X) and 0.04 mm (Y).
17 August 2003
20030819-032635 160 GHz 16 freqs map, tau_cso increasing from 0.07-0.09. Map
shows strong coma in Elevation suggesting a displacement of the SMU of 0.7 mm
in X. This causes a large rms in the map of 29.7 micron.
30 July 2003
Adjustment based on 160 GHz map from 30 June.
Tests in relatively stable weather, but not very good tau_cso (0.16-0.17).
20030730-172814 80 GHz map, test of X, Y SMU positions after repair. Added additional offset (as determined for other Rx's)
in script (0.55, 0.80mm), but this caused coma effect in map, so took these offset out (correction was already applied).
OOF measurements with SCUBA of Uranus (scan 67-75). Middle three with +16 steps offset for 200 good motors in sectors 3, 4, 5.
20030731-004329 80 GHz map with panels in normal position - shows no panels that did not move back. Rms about 29 micron.
30 June 2003
Tests in good weather - tau 0.084 - 0.087
20030630-234232 160 GHz 600 sec. cal at (483,0)
20030630-235645 160 GHz 16 freqs standard map. rms 25.3. Can be used for adjustment.
29 June 2003
600 seconds calibration tests with tau 0.13 - 0.135.
20030629-231041 160 GHz at (483,0)
20030629-232549 160 GHz at (0,0)
20030629-233840 160 GHz 16 freqs standard map. rms 27.8 - weather not ideal (some stripes in map.
13 June 2003
Calibration tests (10 minutes) in unstable (tau 0.12-0.16) grade 4 weather in daytime.
20030613-111128 80 GHz at (307,0)
20030613-113035 160 GHz at (483,0)
20030613-114901 80 GHz at (0,0)
20030613-120122 160 GHz at (0,0)
20030613-135640 80 GHz 16 freqs standard map - rms 39.2 (high humidity, unstable weather).
20030613-143147 80 GHz 16 freqs map with reverse - rms 38.9 (no difference wrt previous map).
Weather is not good enough to decide if reverse more is usable.
19 May 2003
20030519-032416 160 GHz map made in grade 2 weather.
Rms is still 19-25 micron, but map shows systematic deviations in some
sectors.
14 May 2003
Adjustment using moves from 9 April 160 GHz map.
20030514-232916 160 GHz map made in grade 3/4 weather shows increased noise.
The dish is not out of shape, but map cannot be used for adjustment.
9 April 2003
0030409-005744 80 GHz 16 freqs map. During the map there were NBS errors
due to a server fault which caused the SMU to be out of position. The map shows
strong coma terms.
0030409-022221 80 GHz 16 freqs map. Map looks good; rms about 28 micron.
0030409-032446 160 GHz 16 freqs map. Good map - rms about 25 micron; tau was
about 0.12 similar to earlier maps with stripes - this will be investigated.
18 March 2003
20030318-234025 160 GHz 16 freqs map. CSOtau about 0.12, but map shows some
increased noise (stripes).
Most motors with wheel errors and wheel reference moved on 5 March appear
indeed to have moved and should be less out. rms 24-29 micron due to stripes.
5 March 2003
Adjustment using moves from 11 February 160 GHz map.
Adjustment (test) of motors with wheel error and wheel reference.
20030305-144217 160 GHz 16 freqs map at high (90%) and variable humidity.
Maps shows stripes due to weather; rms 30-35 micron.
11 February 2003
Adjustment using moves from 19 January 160 GHz map.
20030211-021516 160 GHz 16 freqs map in stable weather (grade 1/2).
Rms is 24 micron.
18 January 2003
Adjustment using moves from 18 December 160 GHz map.
20030118-235710 80 GHz 16 freqs map in stable weather.
20030119-004817 160 GHz 16 freqs map.
Rms is still about 25 micron.
18 December 2002
Tests with SCUBA confirm that surface becomes better using RxH3
adjustments:
FCF values are higher when moving back
to surface as it was before 4 November.
20021218-040740 - 160 GHz 16 freqs map made in grade 1/2 weather after
adjustment using moves derived from 4 November 160 GHz map.
Rms weighted with 10 dB edge taper is 25 micron.
4 December 2002
20021204-003719 - 160 GHz 6 freqs map shows that during nighttime the rms is
still as low as one month ago.
However map is not very good because telescope does not go below elevations
of about 8.2 (all rows there are at the same elevation).
Sector 5 panel 37 is still out (46 steps) and might be stuck.
4 November 2002
Adjustment of dish based on 160 GHz map 20021021-033800. Grade 1/2 weather.
20021104-031328 160 GHz map (16 frequencies). Rms is 26.8 micron (adjuster
rms 23.0 micron; without bad motors 13.0 micron).
Observe some standards with RxB to see if these show an improvement - most
are somewhat stronger.
Two panels appear to have moved too far - unclear why. Try to move back half
the amount.
20021104-064727 80 GHz map (16 frequencies).
One panel not back in position - try another time.
20021104-085423 80 GHz map (16 frequencies).
These 80 GHz maps were made after sunrise with sun behind UKIRT (no
clouds), and show larger rms.
21 October 2002
Optimize illumination at 160 GHz by change in TMU Y-position
(-5021 to -5000).
Move 12 panels up, one in each sector (10 panels 33 steps, 1 panel 66 steps,
1 panel 17 steps).
Aim is to investigate the accuracy of the software which derives moves files.
20021021-015157 Make 16 frequencies 160 GHz map.
20021021-033800 Move panels back and make another map. Rms is 35 micron.
7 September 2002
Tests of 60 frequencies 80 GHz maps to study standing waves
and investigation of stops.
Option in script to enter calibration position. (307,0) was used in maps.
First test of lock range.
20020907-225833 with stops, 1 msec sampling. Only 59 frequencies measured?
Open Rx and take out stops.
20020908-004225 without stops, 2 msec sampling.
27 August 2002
Investigation of He loss of heterodyne Rx during RxH3 observations.
Last motor tests:
20020827-134959. Move up (4 panels) 33 steps (80 GHz).
20020827-150302, Move back.
Rasters are correct.
18 August 2002
Adjuster hardware test: move up 3 good motors of one panel in each sector,
make map: 20020818-115425
move back, make other map: 20020818-211202
Had to close at 13h due to rain. The second map is rather noisy, but panels
moved.
Change to "OB" system did not yet work, so went back today to "AZ" -
should work next time.
16 August 2002
New version 2.0 of reduction software installed which derives panel moves
from maps (for the moment only for testing).
13 August 2002
Changed coordinate system in script used for map offsets from "AZ" to "OB"
(i.e. no refraction correction);
map centre position remained in "OB".
8 August 2002
Tests for FCO after JCMT shutdown.
20020808-020537 6 Freqs 80 GHz map with calibration as on 15 June
(rms 39 micron).
20020808-030827 32 Freqs map (spacing 1 MHz) without calibration made to
study standing waves (sampling rate 2 msec).
20020808-040131 Small 64 Freqs map, 10 rows (1 MHz) without calibration at
1 msec sampling rate.
20020808-040833 6 Freqs map at 160 GHz without calibration (rms 35 micron).
15 June 2002
More adjuster tests (as on 27 May).
20020615-174616 (10 panels up; 1 panel down) 6 Freqs map without calibration
(tau_cso 0.07).
However present version of reduction program does not like maps without
calibration so we have to repeat the map:
20020615-185218
20020615-200010 (11 panels back)
20020615-210923 (8 panels up)
20020615-221559 (8 panels back)
Then some tests were made to find a better calibration position (without
large gradients)
20020615-234633 Special 80 GHz map at tilted 160 GHz raster to
investigate the gridding
10 June 2002
Commissioned 6 adjusters in sector 6, all work ok.
6 June 2002
Installation of new method of frequency deciphering in reduction program.
Reduction of maps with stripes is now without problem. Rms no longer strongly
dependent on frequency.
2 June 2002
More adjuster tests (as on 27 May).
20020602-102205 (4 panels up) 5 freqs. map. Reduction shows strong
stripes and it is not possible to see which panels moved
(reduction ok with new deciphering 6 June).
20020602-112531 24 freqs. map. Reduction without problem...
20020602-122052 (4 panels back)
(some SMU problems)
20020602-153034 (12 panels up)
20020602-163048 (12 panels back)
27 May 2002
Adjuster tests: try to move flagged motors (no wheel reference,
but wheel error, no phase error) and other motors in same
panel up 33 steps (100 micron) and down again. Make 80 GHz
map after each move.
20020527-105909 (5 freqs, but no enough range, which
reduction program does not like). 7 panels up.
20020527-120703 (back to standard 24 freqs.)
(some problems with 0h UT, and carousel, and high Gunn
temperature (30.4 C) (maps won't start) - increase fan speed
until it drops below 29C.
20020527-162514 (7 panels back)
20020527-173757 (12 panels up)
20020527-184810 (12 panels back)
20020527-195508 (9 panels up) - noisy - stripes
20020527-210218 (9 panels back)
Sector 2, motor 22 is still not completely back to 0
24 May 2002
Calculate offsets of stuck motors in sector 2 and try
to move them again to 0.
15 May 2002
Maps made by TSS
20020515-201043 (80 GHz at 1 frequency instead of 24 -
bug in script (corrected))
20020515-212058 (160 GHz standard map)
20020516-070232 (80 GHz with 160 GHz raster)
The maps show that motors 10, 22, 34, 46 are still out
but less than before.
13 May 2002
Theory is that those panels did not (or little) move up,
but did move down, so we calculate necessary correction,
and try to move them back again.
12 May 2002
Did adjuster hardware test of half of the dish (sectors
1 to 6), by moving in each sector one panel with 3 motors
that are thought to be good (up 33 steps (100 micron), and
back), making 80 GHz standard map after moves:
20020512-141303 (noisy - make more calibration measurements)
20020512-155843
20020512-173948
The rms of the dish is very dependent on the frequency:
select only those frequencies where rms is low. Moving panels back to 0
(no more frequency dependence with new frequency deciphering 6 June).
20020512-184645
Results: 6 panels moved ok (and back) with expected amount.
Five panels in sector 2 moved on 10 May are still at negative
offset (several 100 micron): 10, 22, 34, 46, 52
10 May 2002
Tried to commission motors in sector 2 that were not tested
in August 2000: 4, 10, 16, 22, 28, 34, 40, 46, 52, 58, 64
by moving up +170, -170, -170, +170 steps to find wheel
references. Some datums were found, but not always (e.g.
going up but not down), and some motors got stuck. Tried
to move them back to 0.
3 May 2002
Repeat of 160 GHz map (20020503-025212), and all samples are
good. However the weather during the map was bad (tau_cso
0.4-0.6), so map cannot be used.
Same for 80 GHz map
(20020503-043423) (although the total rms is only slightly
increased compared to maps of 30 April - 45.5 micron)).
30 April 2002
Changed plate temperature from 30C to 32C (80 GHz worked
fine for 32C before it was changed).
Made two 80 GHz maps (with and without tilt):
20020430-205357 and 20020430-222641, and both are good, with
rms which is equal within 1 micron (44.9 vs 45.2 micron).
160 GHz map (20020430-232229) shows missing samples in three
rows which makes map useless. We have no explanation yet
(rest of map is good).
27 April 2002
Another daytime map at 80 GHz - 20020427-144513, showing the
same high rms as on 14 April.
14 April 2002
During the day we made some maps - 20020414-144044 (80 GHz)
and 20020414-154742 (160 GHz).
The 80 GHz map shows a high rms, the cause is unclear at this moment.
The 160 GHz map
looks good (total rms 34 micron, small-scale 31, large-scale
15 micron).
Some difference in rms between reduction in Hilo and Cambridge
which is being investigated (was due to different masking of subreflector
shadows).
3-6 April 2002
During a visit of Richard Hills many improvements of the
system were made. Due to rather bad weather only one 80 GHz
test map could be obtained (20020405-201035).
The total rms
of the dish was about 42 micron (small-scale errors 37 micron,
large-scale errors 20 micron), and ranging from 28 micron in
ring 4 to 58 micron in ring 7.
15 March 2002
Cable at UKIRT repaired and reference mirror realigned.
28 February 2002
Problem with cable pulled (and broken) from Source PC at UKIRT.
20 February 2002
RxH2 was removed from the cabin and will be slaughtered...
19 February 2002
RxH3 software is working fine.
15 February 2002
New RxH3 reduction software installed, but problem to run
because of some missing file.
12 February 2002
80 + 160 GHz maps made by TSS.
Gunns in both maps unlocked mainly in beginning of rows
(first few seconds).
20020212-204756 80 GHz
20020212-214123 160 GHz
Unclear if maps are useful.
We intend to check alignment of reference signal 24 February
(mirrors might be touched during repairs sector 2 etc).
Using new software we see that the low ref power at 80 GHz
is far outside the map whereas the signal power is peaked
at the expected position.
11 February 2002
80 GHz map made by TSS
160 GHz map stopped because of some error
rasterplot of 80 GHz map looks nonsense, with telescope
continuing to measure after end of row towards centre
position. Most samples too long - sample pulse missing?
20020211-212334 80 GHz
7 February 2002
Sector 2 (and 1 to 6) repairs. Should be tested by moving
one panel in each sector over significant distance.
5 February 2002
Bug found in SMU commands causing it to stay at value for
value from previous centre command (for different receiver)
when TCS not restarted. This explains coma terms (wrong X, Z
value).
centrew instead of centre -wait
added track update
Tested, works ok now.
1 February 2002
Dish adjusted using moves file from 80 GHz map 1 January.
80 GHz + 160 GHz maps. No restart of TCS. Maps show large coma term.
20020201-034718
20020201-044139
20 January 2002
80 GHz map for comparison with 1 January map
20020120-215205 80 GHz
18 January 2002
Moves files arrived late, weather forecast bad, so decided to postpone dish
adjustment.
1 January 2002
Obtained 80 GHz + 160 GHz + 80 GHz maps. In between SCUBA OOF measurements.
Last map shows large coma term (similar to RxH2 measurements of 2001).
20020101-022538 80 GHz
20020101-042033 160 GHz
20020101-071541 80 GHz
28 December 2001
Dish adjusted using moves file from 80 GHz map 5 December.
5 December 2001
Obtained 80 GHz + 160 GHz maps
20011205-024049 80 GHz
20011205-050455 160 GHz
November 2001
RxH3 plate temperature put to 32C, Gunn lock is much more
stable now and useful data can be obtained.
November 2001
RxH3 right cover removed with plate heater at 19C. Plate
temperature varies during day between 24C and 29C.
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