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

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

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	2:10 p.m.	35 deg	closest focus scan 15s106
20180115s109	Uranus	2:35 p.m.	39 deg	scan in elevation (constant azymuth)
20180115s122	Uranus	4:00 p.m.	54 deg	closest focus scan 15s120	LP	v0 done
20180115s123	Uranus	4:25 p.m.	57 deg	z0 - 0.1
20180115s124	Uranus	4:50 p.m.	60 deg	z0 - 0.3
20180115s125	Uranus	5:15 p.m.	61 deg	z0 - 0.4
20180116s68	Uranus	5:04 p.m.	61 deg	z0 - 0.2
20180117s92	Mars	7:56 a.m.	35 deg	z0 - 0.2

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	comment
20180116	69	0.3

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 secondary calibrator scans

Dates	scan #	source	elevation	comment
20180116	82-85	MWC349	29-26	otf 8x5
20180116	102-105	Uranus	45-44	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

-  ⇤ ← Revision 4 as of 2018-01-11 10:51:25 → 
  Size: 3919
  Editor: NikaBolometer
  Comment:
+   ← Revision 26 as of 2018-01-17 13:47:47 → ⇥
  Size: 4266
  Editor: NikaBolometer
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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-<<TableOfContents(3)>>


== Calibration observation plan == 

Draft discussed in ’Tiger Team’ meeting with Hervé, Nico, Juan, Martino, Jean-François, Samuel & Laurence  

 1. Alignment checks 
    * to do if the first pointing sequence (pointing, focus, pointing) is off-source
    * check the alignment using the laser on Monday before the campaign
if beammaps are not good despite a good weather, a better matching of the optical and radial axis can be tempted (using the ecosorb)  
 1. Mini pointing session
    * to be done the first night of the campaign            
 1. Beammap at optimal axial and lateral focus
    * perform a beammap sequence, focus + pointing + beammap,  at least once a day
    * span various elevation 
    * if good weather try and use lateral focus corrections from the maps of the residual after subtraction of a Gaussian beam 
    * do a few series of beammaps at different axial focus in a row: at z0 - 0.2mm, z0 - 0.3mm and z0 - 0.4mm 
  1. Opacity 
    * several skydips a day in all possible weather conditions, basically one per 8-hour shift
  1. Calibration 
    * Monitor primary and secondary calibrators. Few of them but repeatedly along the run and at various elev.
    * 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)
  1. Gain elevation correction
    * at least two complete spans of the elevation from about 20 to 80 degrees using 3C84
+This page gather the information on the technical observations that are needed to perform NIKA2 calibration.
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+Line 7:
-The pointing model is to be checked on the first night of the campaign by means of a mini pointing session (about 10 sources), and if needed a complete session (minimum 15 sources, 30 is better). 
[Add here a summary of the pointing session(s)]
+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
-Line 41:
+Line 11:
-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). If the weather conditions are good enough, lateral focus corrections can be implemented as well, using the maps of the residual after subtraction of a Gaussian beam.
+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).
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+Line 22:
-|| '''Scan ID''' || '''analyser initials''' || '''comments'''                || '''status'''               ||
|| 20171030s268  ||   LP   || Uranus, obs. date is 11:15 p. m., elev about 60 deg, finished 30 min. before a crash of the main pump, A1 has 12.5 arcsec average fwhm||   done                         ||
+||                |||||||| ''' observing condition '''     |||||| '''analysis status''' ||
|| '''scan ID'''  ||  ''source''|| ''UT'' || ''elevation'' ||  ''comments''  || ''analyser ID'' || ''data quality'' || ''status'' ||
|| 20180115s108 || Uranus || 2:10 p.m. || 35 deg ||  closest focus scan 15s106  ||  ||  || ||
|| 20180115s109 || Uranus || 2:35 p.m. || 39 deg ||  scan in elevation (constant azymuth)  ||  ||  || ||
|| 20180115s122 || Uranus || 4:00 p.m. || 54 deg ||  closest focus scan 15s120   || LP || v0 done || ||
|| 20180115s123 || Uranus || 4:25 p.m. || 57 deg ||  z0 - 0.1 ||  ||  || ||
|| 20180115s124 || Uranus || 4:50 p.m. || 60 deg ||  z0 - 0.3  ||  ||  || ||
|| 20180115s125 || Uranus || 5:15 p.m. || 61 deg ||  z0 - 0.4  ||  ||  || ||
|| 20180116s68  || Uranus || 5:04 p.m. || 61 deg ||  z0 - 0.2  ||  ||  || ||
|| 20180117s92  || Mars   || 7:56 a.m. || 35 deg ||  z0 - 0.2  ||  ||  || ||
-Line 66:
+Line 43:
-''Table for gain curve task (3C84, i.e. 0316+413 in nikas-17)''
+''Table of the Skydip scans''
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+Line 46:
-|| 20180112   ||            ||        ||          ||
+|| 20180116   || 69         || 0.3    ||          ||


== 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:

{{attachment:Visibility_calib.pdf | Science Visibility plot | width=850}}

''Table of secondary calibrator scans'' 

|| Dates      || scan #     || source ||  elevation || comment  ||
|| 20180116   || 82-85      || MWC349 ||  29-26     || otf 8x5  ||
|| 20180116   || 102-105    || Uranus ||  45-44     || otf 8x5  ||
-Line 74:
+Line 67:
-''Table for gain curve task (3C84, i.e. 0316+413 in nikas-17)''
+Observe at least two complete spans of the elevation from about 20 to 80 degrees using 3C84
-Line 76:
+Line 69:
-|| Dates       || scan #    || UT || elevation || comment  ||
|| 20180116    ||           ||    ||           || otf 8x4  ||
+''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 ||