Ignore:
Timestamp:
Apr 5, 2019 3:11:26 PM (4 years ago)
Author:
srkline
Message:

updates to the beam center corrections that take into account the lateral variation of zero points of the tubes. This is an important correction to the reference beam center, especially when the graphite monochrmoator is used.

various bug fixes included as part of reduction , largely to catch missing or incorrect information in the file header.

New "patch" functions have been added for number of guides, beam stops, source aperture, etc. which were missing in the file and caused the resolution calculation to be totally incorrect.

File:
1 edited

Legend:

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  • sans/Dev/trunk/NCNR_User_Procedures/Reduction/VSANS/V_Initialize.ipf

    r1138 r1141  
    8585// 
    8686// 200 appears to be a better value - (empirical, based on teflon/converging pinhole data) 
    87 Constant kReadNoiseLevel_bin4 = 200 
    88 //Constant kReadNoiseLevel_bin4 = 208 
    89 Constant kReadNoiseLevel_Err_bin4 = 14 
    90  
     87//Constant kReadNoiseLevel_bin4 = 200 
     88//Constant kReadNoiseLevel_Err_bin4 = 14 
     89// after binning/processing changes from March 2019: 
     90Constant kReadNoiseLevel_bin4 = 3160                    // from bkg area of sans30201 (a transmission measurement) 
     91Constant kReadNoiseLevel_Err_bin4 = 50          //estimated 
    9192 
    9293// TODOHIGHRES: these values are complete fiction 
    9394Constant kReadNoiseLevel_bin1 = 20 
    9495Constant kReadNoiseLevel_Err_bin1 = 1 
    95  
    96  
    9796 
    9897// Pixel shifts for the back detector to bring the three CCDs into registry 
     
    112111Constant                kShift_BottomX_bin1 = 20 
    113112Constant                kShift_BottomY_bin1 = 130 
    114  
    115113 
    116114 
     
    249247        Execute "Initialize_VSANSPreferences()"  
    250248 
     249        Execute "V_TubeZeroPointTables()"                       // correction to the beam center 
    251250         
    252251        // set the lookup waves for log/lin display of the detector images 
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