User Manual for REAL TIME DATA ANALYSIS on SAMI

CROSS:

1. log on sami

2. edit todo_cross.pro, update scan_num, day and the reference detectors if needed.

2. in idl, type .r todo_cross

3. the corrections are output on the plots and in offset1 and offset2. These corrections must be added as is to your current values of pointing offsets. e.g., you started your observation with SET POINTING 3.4 -1.2. After running todo_cross, you find DeltaAz=0.5, DeltaEl=1. Then, in PAKO, type SET POINTING 3.9 -0.2. In the pako help file, it was said to give the pointing corrections without the initial offset because it assumed you were doing the cross on the center pixel with azimuth and elevation offsets zero.

FOCUS:

1. log on sami

2. edit todo_focus.pro, update scan_num, day and the reference detectors if needed.

2. in idl, type .r todo_focus

3. The returned value of the focus must be passed to PAKO as is. e.g. if you find z = -1.9, then in PAKO type : SET FOCUS -1.9

OTF Geometry:

Please read OTFGeometryHelp carefully before...

1. Edit otf_geometry_help.pro and follow the guide. This is not a standard idl routine file, it is just a memo with the relevant lines to cut and paste into the idl terminal window.

=== General information ==

1. Log on Sami with username archeops and the usual passwd. You are then in the Home directory 2. From a terminal window type: emacs todo_NameOfProcedure.pro & 3. You may then either cut and paste directly the lines of this file into the IDL terminal window, or, in the idl window, type: .r todo_NameOfProcedure

4. if the keyword png is set (either png=1 or /png), the relevant files are put in the directory $NIKA_PLOT_DIR/day_scannum. For unclear reason, it prevents the plots to pop up properly in source_map.pro though....

  1. General Info:
    • all the products of the real time data analysis (.png, .fits, .save) are stored in this folder ………..;
    • the parameter scan_num (number of scan) is an integer
    • the parameter day (date of the scan) is a string as 'yearmonthday' (ex: '20121120')
  2. Preliminary actions:
    • start idl
  3. POINTING PROCEDURE:

Determine pointing offset by making 4 subscans (see pointing Pako procedure on …….).

……………………………

offset returns the value of the RELATIVE offset for the two arrays wrt previous value set in Pako. The value obtained from 1mm array has to be considered as priority.

  1. FOCUS PROCEDURE

The procedure intends to maximize the power on one reference pixel (where the considered source is centered) when the position of the secondary mirror is changed by X steps (see Pako procedure on …..).

the procedure produces 4 plots, 2 for each array. Two plots, one for 2mm array and the other for 1mm array, show the TOD of the procedure. (and the fraction of the plateau chosen for the analysis (in green). Plots IDL33 (2mm array) and IDL35 (1mm array) show the total power (in Hertz!) versus the position of the secondary, for reference pixel (top right in red) and for nearby pixels (9). The best position is fitted with a second order polynomial.

z_final returns the values of the ABSOLUTE best position of the secondary mirror for the two arrays (z_final(0)=best pos 2mm - z_final(1)=best pos 1mm). The value obtained from 1mm array has to be considered as priority.

  1. SELECT KIDS PROCEDURE

This procedure computes individual maps to determine the kids parameters that can be upgraded in otf_geometry. This procedure should be run only once at the beginning of the campaign.

  1. OTF GEOMETRY PROCEDURE
    • Open the IDL script RealTime/todo_x.pro
    • execute from line X1 to line X2
    • execute 'otf_geometry, scan_num, day, info=info'