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This page gather the information on the technical observations that are needed to perform NIKA2 calibration.

Contents

Pointing
Beammaps
Opacity
Calibrators
Gain-elevation monitoring

Pointing

A full pointing session was executed on the first night, from scans 20180116s116 to 20180116s156, interrupted to do a gain-elevation measurement on 3C84, and resumed from scans 20180116s168 to 20180117s19., with 34 measurements in total. Overall, the pointing at 2mm where of good quality. During that night, the beam was very stable with FWHM values at 1mm of 11.3” and 17.6” @ 2mm, the focus did not change much. Data has been sent to Juan Penalver and Albrecht Sievers. The new pointing model was applied on 2018-01-17T15:34 (from scan 20180117s194 onward).

Beammaps

Beammap sequences, which are focus + pointing + beammap, are to be done at least once a day, spanning various elevation, at the best average focus (z central - 0.2 mm).

Beammap analysis status

The table below gathers the beammap scan ID, comments related either to the observing condition or to the reduced beammap quality and the analysis status

Status "done" means the analysis is completed, namely the kidpar file is produced using a 2-step iteration analysis, and uploaded in SVN.

	observing condition				analysis status
scan ID	source	UT	elevation	comments	analyser ID	data quality	status
20180115s108	Uranus	14:10	35 deg	closest focus scan 15s106	HA	V0 done, 2mm seems OK, 1mm no., show rotation difference azel to nasmyth measured and fitted, bof...
20180115s109	Uranus	14:35	39 deg	scan in elevation (constant azymuth)
20180115s122	Uranus	16:00	54 deg	closest focus scan 15s120	LP	v0 done, usable
20180115s123	Uranus	16:25	57 deg	z0 - 0.1	HA
20180115s124	Uranus	16:50	60 deg	z0 - 0.3	LP
20180115s125	Uranus	17:15	61 deg	z0 - 0.4
20180116s68	Uranus	17:04	61 deg	z0 - 0.2
20180117s92	Mars	07:56	35 deg	z0 - 0.2	HA, BL, LP	v0 done, promizing! v2: avg FWHM=12.4, 12.2, 18.2 and number of valid KIDS = 869, 758 and 454 for A1, A3 and A2	done
20180118s205	Uranus	18:00	62 deg	tau225=0.35, Huge beams right after the beammap: focus drift	HA	v0 done, wavy kid positions. Bof...
20180119s73	Jupiter	06:55	36 deg	tau225=0.4
20180119s74	Mars	07:20	34 deg	tau225=0.4	LP	abnormal refraction
20180121s92	Mars	07:05	33 deg	tau225=0.2	LP	v0 done, abnormal refraction : not usable
20180122s82	Mars	07:34	34 deg	tau225=0.15	LP	v2: avg FWHM 12.4, 12.2, 18.2 and nb of valid KIDS = 864, 736, 439 for A1, A3 and A2	done
20180122s309	3C84	23:20	41 deg	tau225=0.16	HA	V0 done, usable. V2 done, FWHM 12.0,11.9 and 18.3, Mb kids = 826, 808, 504 OK. usable. Recalibration using 3C84 flux: kidpar_20180122s309_v2_HA_skd13_calUranus12.fits	done
20180123s97	Mars	07:21	34 deg	tau225=0.15

Special beammap sequences

For the optimization of the best average focus, a few series of beammaps at different axial focus in a row are needed: the focus settings to be spanned are z0 - 0.2mm, z0 - 0.3mm and z0 - 0.4mm.
For the study of the elevation impact and the test of destriping methods, couples of beammap with orthogonal scanning startegy will be made (using @beammap99.. a (default) and e (along the elevation)).

Opacity

A skydip scan per 8-hour observation shift, in all possible weather conditions, is needed

Table of the Skydip scans

Dates	scan #	tau225	UT	comment
20180115	110	0.16	14:58
20180115	126	0.14	17:40
20180116	69	0.33	17:30
20180117	20	0.22	00:51
20180117	195	0.12	15:38
20180118	31	0.16	02:49
20180118	197	0.34	17:06
20180119	8	0.36	01:24
20180119	71	0.41	06:32
20180119	129	0.31	12:22
20180119	228	0.23	17:32
20180120	58	0.17	05:17
20180120	188	0.25	18:34
20180121	93	0.21	07:28
20180122	135	0.16	12:10
20180122	212	0.15	16:07

Calibrators

Monitor primary and secondary calibrators. Few of them but repeatedly along the run and at various elevation
Observe in priority MWC349: use the loop script comprizing 4 OTF scans, 3 times a day
Observe also Uranus, Mars & Neptune + NGC7027 (and optionally CRL2688)

Below the visibility plot:

Table of OTF 8x5 scans of primary calibrators

Dates	scan #	source	elevation	comment
20180116	102-105	Uranus	45-44	otf 8x5
20180117	282 + 284-287	Uranus	30-26	otf 8x5

Table of OTF 8x5 scans of secondary calibrators

Dates	scan #	source	elevation	comment
20180116	82-85	MWC349	29-26	otf 8x5
20180118	65-68	MWC349		otf 8x5
20180119	187-191 + 193-196	MWC349		otf 8x5
20180120	169-172	MWC349		otf 8x5
20180121	113-116 + 117-120	MWC349		otf 8x5
20180122	95-98, 112-116, 118-121	MWC349		otf 8x5

Gain-elevation monitoring

Observe at least two complete spans of the elevation from about 20 to 80 degrees using 3C84

Table for gain curve task (3C84, i.e. 0316+413 in nikaw-17)

Dates	scan #	UT	elevation	comment
20180116	111-114	20:55-21:15	76-73 deg	otf 8x5
20180116	163-167	23:30-23:40	48-46 deg	otf 8x5
20180117	35-38	2:30-2:45	17-14 deg	otf 8x5, OUT OF FOCUS
20180117	39-42	2:45-3:00	14- deg	otf 8x5, focus set by hand without having used @focusOTF-Z, but we checked the focus was stable (no sizeable change) afterwards
20180117	300-303	22:45-23:00	56- deg	otf 8x5, scan 300: RTA crashed with error "end of file encountered in the imbfits file"

Table for gain curve task (2251+158 in nikaw-17)

Dates	scan #	UT	elevation	comment
20180119	108-111	10:10	20 deg	otf 8x5
20180121	149-152	12:30	50 deg	otf 8x5
20180119	182-186	15:21	70 deg	otf 8x5
20180120	184-186	18:30	45 deg	otf 8x5
20180120	208-211	20:20	20 deg	otf 8x5

-  ⇤ ← Revision 63 as of 2018-01-23 01:55:51 → 
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-A full pointing session was executed on the first night, from scans 20180116s116 to 20180116s156, interrupted to do a gain-elevation measurement on 3C84, and resumed from scans 20180116s168 to 20180117s19., with 34 measurements in total. Overall, the pointing at 2mm where of good quality. During that night, the beam was very stable with FWHM values at 1mm of 11.3” and 17.6” @ 2mm, the focus did not change much. Data has been sent to Juan Penalver and Albrecht Sievers
+A full pointing session was executed on the first night, from scans 20180116s116 to 20180116s156, interrupted to do a gain-elevation measurement on 3C84, and resumed from scans 20180116s168 to 20180117s19., with 34 measurements in total. Overall, the pointing at 2mm where of good quality. During that night, the beam was very stable with FWHM values at 1mm of 11.3” and 17.6” @ 2mm, the focus did not change much. Data has been sent to Juan Penalver and Albrecht Sievers. The new pointing model was applied on 2018-01-17T15:34 (from scan 20180117s194 onward).
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-|| 20180122s82  || Mars    || 07:34 || 34 deg ||  tau225=0.15 || LP || v2: avg FWHM = 12.4, 12.2, 18.2 and nb of valid KIDS = 864, 736, 439 for A1, A3 and A2  || done ||
|| 20180122s309 || 3C84    || 23:20 || 41 deg || tau225=0.16  || HA || V0 done, usable. V2 done, FWHM 12”, 18” OK. usable. Recalibration using 3C84 flux TBD || done ||
+|| 20180122s82  || Mars    || 07:34 || 34 deg ||  tau225=0.15 || LP || v2: avg FWHM 12.4, 12.2, 18.2 and nb of valid KIDS = 864, 736, 439 for A1, A3 and A2  || done ||
|| 20180122s309 || 3C84    || 23:20 || 41 deg || tau225=0.16  || HA || V0 done, usable. V2 done, FWHM 12.0,11.9 and 18.3, Mb kids = 826, 808, 504 OK. usable. Recalibration using 3C84 flux: kidpar_20180122s309_v2_HA_skd13_calUranus12.fits || done ||
|| 20180123s97  || Mars    || 07:21 || 34 deg || tau225=0.15  ||  ||   || ||
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+|| 20180122   || 95-98, 112-116, 118-121 || MWC349 ||     || otf 8x5  ||