Diff for "NK2013_Jun13" - www.iram.es Main Wiki

Differences between revisions 36 and 39 (spanning 3 versions)

Describe NK2013_Jun13 here.

Back to list of day to day logbook of observations

2013-06-13

Cryostat Temperature: 220mK .
Arrays status today: 192 pixels 1mm ; 128 pixels 2mm
Modulation frequency: 8kHz 1mm, 4kHz 2mm

Opacity is measured with the new taumeter at 225 GHz

For start:

Working with the new pointing model (rms went from 5 to 2 arcsec for yesterday pointing session)
Nasmyth offset 28, 28 implemented in the pointing model
offset 0 0 /system nasmyth

Set pointing : 0, 0

NEW and definitive pointing model determined from yesterday

Set Focus : -1 mm

Quick description of the session:
Mars Pointing, focus, otfgeom.
Secondary calibrators
Bright extended source(s): Crab, NGC2023, OrionLBS
Skydip
Arp220
Faint sources to measure noise figures (20-40 mJy range at 1mm)
SZ on RXJ

At 12:50 the NCS process that control the adjustment of the M2 focus depending on the temperature gradient stopped without anybody noticing it (no alarm); this had no effect until the evening since the outside temperature was stable, but after sunset we lost about ~10 degrees in ~2 hours. Up to scan 178 everything was OK, but after integration on a faint source at scan 199 we found huge beams, we spent a significant time on various focus before figuring out that we had to move M2 by more than 3mm before finding again reasonable beams ! Such a big change of focus is very unusual, that's how we figured out the problem.

Scan	UT	Source	Command	Az	El	Pointing X, Y, Focus	Tau225	Found	Comment
123	10h05	Mars	Track	133	69	0, 0, -2.4	0.84		tuning the KIDs, checking file transfer
124	10h10	Mars	Track	133	69	0, 0, -2.4	0.84
125	10h19	Mars	Track	133	69	0, 0, -1	0.84
126	10h23	Mars	Track	139	71	0, 0, -1	0.84
127	10h26	Mars	cross	141	71	0, 0, -1	1.16	2mm -3 0
128	10h32	Mars	pointliss			-3, 0, -1	1.16	1 and 2mm -7 3
129	10h38	Mars	cross	149	73	-7, 3, -1	1.16	2mm -4,4 Map:-6,3
130	10h42	Mars	pointliss	152	73	-7, 3, -1	0.938	-2,2;-2,3
131	10h46	Mars	pointliss	154	73	-2, 3, -1	0.938	-5,-2;-5,-1
132	10h50	Mars	pointliss			-5, -1, -1	0.579	-8,6	sky is cloudy and noisy
133	10h56	Mars	pointliss	163	74	-8, +6, -1	0.739	-5,-2;-5,-1	pointing keeps changing
134	11h01	Mars	faintliss	167	74	-5, -1, -1	1.09	-6,2;-6,2 Fwhm 16.7,20	PSF spread is large
135	11h09	Mars	pointliss	174	75	-6, +2, -1	1.09	-5,2;-5,2 Fwhm 15,19
136	11h16	Mars	pointliss	180	75	-6, +2, -1	1.09	-7,2;-6,2 Fwhm 16,20
137	11h20	Mars	focusp2	184	75	-6, +2, -1	4?!	-0.1?;-0.75	focus +-2mm Sky unstable at 1mmm
138	11h45	Mars	otfgeom	205	73	-6, +2, -1		-7,4;-7,4 Fwhm 14.5 19.5	for lunch
139	11h45	Mars	otfgeom	205	73	-6, +2, -1			cancelled. Scan never started.
140	12h20	Mars	otfgeom	231	68	-6, +2, -1			stopped in the middle. Block in antenna
141	12h48	Mars	otfgeom	231	68	-6, +2, -1			cancel
142	13h03	Mars	track	244	62	-6, +2, -1
143	13h10	Mars	otfgeom	246	61	-6, +2, -1			many clouds resonances lost in the middle
144	13h39	Mars	track	253	55	-6, +2, -1			resonances found by Nello
145	13h41	Mars	pointliss	254	55	-6, +2, -1		0,9;-1,11 but uncertain
146	13h44	Mars	pointliss	254	55	-2, +10, -1	0.841	-8,4 ?
147	13h49	Mars	pointliss	256	54	-2, +10, -1		-8,2;-9,2	Went off resonance, sky so fluctuating
148	14h04	Mars	pointliss	256	54	-9, +2, -1		-9,1;-9,1	lots of resonances lost
149	14h08	Higelev	track	179.7	79.9	-9, +2, -1			Go to a stall position HO 180 80 and wait for an hour
	14h20	Higelev	nothing	179.7	79.9	-9, +2, -1			resonances OK, >14h42 no tuning
150	16h32	3C279	track	123	28	-9, +2, -1			resuming observations, sky a bit clearer
151	16h32	3C279	pointliss			-9, +2, -1		-8 0; -8 -1	not too far
152	16h37	3C279	pointliss			-8, 0, -1		-8 2; -8 0	ok
153	16h42	3C279	cross			-8, 0, -1	0.932	map -9 3;-9 1, X -9 2; -7 0 Fl 8,12Jy	ok
154	16h47	3C279	faintliss			-8, 0, -1	0.84	-9 0;-10 1
155	16h55	3C279	focusp2			-9, 0, -1		-2?,-1~	+-2mm
156-160	16h58	3C279	focusliss			-9, 0, -1	0.914	-1.6 best trade-off	-1,-1.6,-2.2,-0.4,0.2
161	17h12	3C279	pointliss			-9, 0, -1.6		-8 -1;-8 -1 Fw15.7;19.8 Fl 11,12Jy
162	17h16	3C279	otfgeom			-8, -1, -1.6	0.892		cloudy but reso not lost
163	17h27	3C279	faintliss	137	37	-8, -1, -1.6	0.860	-5 0;-5 0 Fw16.8,20 Fl 10,18Jy
164	17h39	IRC10216	track			-5, 0, -1.6
165	17h40	IRC10216	pointliss			-5, 0, -1.6		-6 2;-5 1 FW25arcsec,Fl 3.6,0.7Jy	Extended?
166	17h43	IRC10216	faintliss			-5, +1, -1.6		-6 3;-7 2 Fw22,26 Fl4,0.7Jy
167	17h49	IRC10216	faintliss			-5, +1, -1.6		-5 2;-5 2
168	17h56	M82	track	347	56	-5, +1, -1.6
169	18h01	M82	pointliss	347	55	-5, +1, -1.6	0.829		look ok
170	18h03	M82	faintliss	347	55	-5, +1, -1.6	0.810
171	18h10	M82	faintliss	345	55	-5, +1, -1.6	0.894	fl1.2,0.5Jy
172-173	18h17	M82	otf3x3	345	55	-5, +1, -1.6	0.840		Az and El 3x3 arcmin scans
174	18h30	M87	track	154	63	-5, +1, -1.6	0.894		Readout Box rebooted
175	18h49	M87	faintliss	164	64	-5, +1, -1.6			all right
176	18h55	0923+392	track	285	58	-5, +1, -1.6	0.822
177	19h01	0923+392	pointliss	285	58	-5, +1, -1.6		-5,+2; -4,+2
178	19h03	0923+392	faintliss	286	56	-4, +2, -1.6		-6,+2; -6,+2, Fw13.6,17.3arcs,Fl6.3,5.5Jy
179	19h08	HLS091828	track	308	54	-6, +2, -1.6
180-181	19h13	HLS091828	faintlisst	308	54				faintliss followed by a track to tune resonances
182-183	19h17	HLS091828	faintlisst	308	53				detected at 1 and 2mm
184-185	19h24	HLS091828	faintlisst	308	52
186-187	19h30	HLS091828	faintlisst	308	51
188-189	19h36	HLS091828	faintlisst	308	50
190-191	19h42	HLS091828	faintlisst	308	49
192-193	19h50	HLS091828	faintlisst	308	48
194-195	19h59	HLS091828	faintlisst	308	47
196-197		HLS091828	faintlisst	308	47
198	20h11	0923+392	track	291	43	-6 -2 -1.6	0.659
199	20h11	0923+392	faintliss	291	43	-6 -2 -1.6	0.659	-7,2;-7,0 Fw23,19 Fl2.3,4.1Jy
200-203	20h18	DIY	skydip scan 202	291		-6 -2 -1.6	0.677-0.614		No problem
204	20h27	0923+392	track	292	40	-6 -2 -1.6	0.659
205	20h28	0923+392	pointliss	292	40	-7 0 -1.6	0.640	2mm: -8,1
206	20h30	3C279	track	198	45	-7 0 -1.6	0.594
207	20h34	3C279	pointliss	199	45	-7 0 -1.6		-9 2;-9 1;Fw 27,20;Fl7,14Jy
208	20h38	3C279	focusp2	199	45	-7 0 -1.6		0.27 -0.67	Big change as expected
209	20h42	3C279	pointliss	201	45	-9 2 -0.5			Very large beams?
210	20h47	3C279	focusp2	203	44	-9 2 -0.5		-2.4 -1.9
211	20h49	3C279	focusp	203	44	-9 2 -2.0		-1.3 ?
212-216	20h54	3C279	focusliss	203	44	-9 2 -2.0		Focus is -2.7!!	-1.5,-2.1,-2.7,-0.9,-0.3 two last scans many 1mm pixels lost
217	21h08	3C279	focusp	209	42	-10 -1 -3.0		-2.5 found 1mm
218	21h13	3C279	pointliss	211	42	-10 -1 -2.5		-13 1;-13 1Fw23,22Fl11,19Jy	strange
219-223	21h21	3C279	focusliss	213	41	-10 -1 -2.5		-7,0 -3.7!	-2.5 -3.1 -3.7 -1.9 -1.3
224-228	21h21	3C279	focusliss	213	41	-10 -1 -2.5	0.490	-4 1 foc:-3.5	-4 -4.6 -5.2 -3.4 -2.8
229	21h21	3C279	focusliss	220	38	-4 -1 -3.5			canceled reboot kid readouts + see note above

-  ⇤ ← Revision 36 as of 2013-06-13 21:50:22 → 
  Size: 10985
  Editor: NikaBolometer
  Comment:
+   ← Revision 39 as of 2013-06-13 22:02:09 → ⇥
  Size: 11639
  Editor: NikaBolometer
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 33:
+At 12:50 '''the NCS process that control the adjustment of the M2 focus depending on the temperature gradient stopped without anybody noticing it (no alarm)'''; this had no effect until the evening since the outside temperature was stable, but '''after sunset''' we lost about ~10 degrees in ~2 hours. Up to scan 178 everything was OK, but after integration on a faint source at scan 199 we found '''huge beams''', we spent a significant time on various focus before figuring out that we had to '''move M2 by more than 3mm before finding again reasonable beams !''' Such a big change of focus is very unusual, that's how we figured out the problem.