NAME¶

lalapps_mkcalfac - generates frame and ILWD calibration factor files

SYNOPSIS¶

lalapps_mkcalfac -run run -ifo'H1'|'H2'|'L1' file [[-ifo'H1'|'H2'|'L1' file2 ]...]

DESCRIPTION¶

lalapps_mkcalfac generates frame-format and ILWD-format calibration factor files from a set of ascii-format files.

The calibration factors, alpha and alpha x beta, are factors that represent a scale change in the gain of the sensing (cavity response) function and the open-loop gain compared to an epoch when a point reference response was measured. These gains are observed to drift with time, and it is necessary to use these factors to correct a reference closed-loop response function for the interferometer for time of interest. The factors are determined by using injected calibration lines or by other means.

For any given run (e.g., E7, S1, ...) there may be one (L1 at LLO) or two (H1 and H2 at LHO) interferometers operating at a given site. Each interferometer has its own ascii-format calibration file. However, the frame-format file containing the calibration factors must include all interferometers operating at that site. Hence, it is possible to specify multiple ifos for a given run. (See the examples below.)

The ascii-format calibration files found at URL: http://blue.ligo-wa.caltech.edu/engrun/Calib_Home/html/cal_home.html

OPTIONS¶

-run run

Specify the run run for the output file names, e.g., E7, S1, etc.

-ifo ifo filename

Specify the interferometer ifo (one of H1, H2, or L1) and the associated ascii-format file filename

EXAMPLE¶

The command

will generate S1 calibration factor files for LLO from the ascii file S1-L1-CAL-FACTORS.txt. The command

will generate S1 calibration factor files for LHO from the ascii files S1-H1-CAL-FACTORS.txt and S1-H2-CAL-FACTORS.txt.

AUTHOR¶

Jolien Creighton