source: sans/Dev/trunk/NCNR_User_Procedures/Reduction/USANS/KIST_USANS_Utils.ipf @ 962

#pragma rtGlobals=1             // Use modern global access method.
#pragma version=2.20
#pragma IgorVersion=6.1

// utilities and constants that are specific to the KIST USANS
//
// contains updated instrument constants (MHK) 2014-06-20
// added to NCNR SVN 9/2015 (SRK)

//facility-specific constants
Function Init_USANS_Facility()

        //INSTRUMENTAL CONSTANTS 
        //Variable/G    root:Packages:NIST:USANS:Globals:MainPanel:gTheta_H = 3.9e-6            //Darwin FWHM   (pre- NOV 2004)
        Variable/G      root:Packages:NIST:USANS:Globals:MainPanel:gTheta_H = 7.59e-6           //Horizontal divergence of kist-usans,  mhk--08/2102012
        //Variable/G    root:Packages:NIST:USANS:Globals:MainPanel:gTheta_V = 0.014             //Vertical divergence   (pre- NOV 2004)
        Variable/G      root:Packages:NIST:USANS:Globals:MainPanel:gTheta_V = 0.057    // KIST-USANS Vertical divergence =0.057 radian (2013) * (ÇÑŒö°æ ³ëÆ®ºÏ¿¡¿¡ 2014-06-20  Àû¿ë)
        //Variable/G  root:Globals:MainPanel:gDomega = 2.7e-7           //Solid angle of detector (pre- NOV 2004)
        //Variable/G    root:Packages:NIST:USANS:Globals:MainPanel:gDomega = 7.1e-7             //Solid angle of detector (NOV 2004)
        Variable/G      root:Packages:NIST:USANS:Globals:MainPanel:gDomega = 1.73e-6            //KIST-USANS Solid angle of detector (mhk----07/18/2013) **(2014-06-20  Àû¿ë)
        Variable/G      root:Packages:NIST:USANS:Globals:MainPanel:gDefaultMCR= 1e6             //factor for normalization
        
        //Variable/G  root:Globals:MainPanel:gDQv = 0.037               //divergence, in terms of Q (1/A) (pre- NOV 2004)
        //Variable/G    root:Packages:NIST:USANS:Globals:MainPanel:gDQv = 0.117         //divergence, in terms of Q (1/A)  (NOV 2004)
           Variable/G   root:Packages:NIST:USANS:Globals:MainPanel:gDQv = 0.09          //detector divergence, in terms of Q (1/A), mhk --09-12-2012 
        

        String/G root:Packages:NIST:gXMLLoader_Title=""
        
        //November 2010 - deadtime corrections -- see USANS_DetectorDeadtime() below
        //Only used in BT5_Loader.ipf and dependent on date, so defined there on each file load.
        
        
        // to convert from angle (in degrees) to Q (in 1/Angstrom)
        //Variable/G root:Packages:NIST:USANS:Globals:MainPanel:deg2QConv=5.55e-5               //JGB -- 2/24/01
        // Variable/G root:Packages:NIST:USANS:Globals:MainPanel:deg2QConv=2.741557e-2          //motor position in degree unit MHK for KIST ---08/15/2012
        Variable/G root:Packages:NIST:USANS:Globals:MainPanel:deg2QConv=1.5707963e-4    // motor position in mm (x100) MHK for KIST ---07/19/2013
        // Variable/G root:Packages:NIST:USANS:Globals:MainPanel:deg2QConv=1.5707963e-2 // motor position in mm  MHK for KIST ---07/19/2013

                
        // extension string for the raw data files
        // -- not that the extension as specified here starts with "."
        // String/G     root:Packages:NIST:USANS:Globals:MainPanel:gUExt = ".bt5"
            String/G    root:Packages:NIST:USANS:Globals:MainPanel:gUExt = ".kusan"     //mhk--08/15/2012
        
        
        
        
        return(0)
end


// returns the detector dead time for the main detectors, and the transmission detector
//
// NCNR values switch based on a date when hardware was swapped out. other facilities can ignore the date
//
// also, if dead time is not known, zero can be returned to inactivate the dead time correction
//
//
//Discovered significant deadtime on detectors in Oct 2010
//JGB and AJJ changed pre-amps during shutdown Oct 27 - Nov 7 2010
//Need different deadtime before and after 8th November 2010
//
Function USANS_DetectorDeadtime(filedt,MainDeadTime,TransDeadTime)
        String filedt
        Variable &MainDeadTime,&TransDeadTime
        
//      if (BT5Date2Secs(filedt) < date2secs(2010,11,7))
//                      MainDeadTime = 4e-5
//                      TransDeadTime = 1.26e-5
//                      //print "Old Dead Times"
//                      //MainDeadTime = 0
//                      //TransDeadTime = 0
//      else
//                      MainDeadTime = 7e-6
//                      TransDeadTime = 1.26e-5
//                      //print "New Dead Times"
//      endif
        
        MainDeadTime = 0
        TransDeadTime = 0


        return(0)
end