Ignore:
Timestamp:
Aug 18, 2011 7:02:23 PM (13 years ago)
Author:
Jae Cho <jhjcho@…>
Branches:
master, ESS_GUI, ESS_GUI_Docs, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc, costrafo411, magnetic_scatt, release-4.1.1, release-4.1.2, release-4.2.2, release_4.0.1, ticket-1009, ticket-1094-headless, ticket-1242-2d-resolution, ticket-1243, ticket-1249, ticket885, unittest-saveload
Children:
83bf44e1
Parents:
b470477
Message:

updated help doc and wave pulse shapes(TOF)

Location:
calculatorview/src/sans/perspectives/calculator/media
Files:
3 added
2 edited

Legend:

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  • calculatorview/src/sans/perspectives/calculator/media/resolution_calculator_help.html

    r9e2af9a rf67ed10  
    33<h4>SANS Q Resolution Estimator</h4> 
    44<ul> 
    5 <li><a href="#Description">Description:</a></li> 
     5<li><a href="#Description">Description</a></li> 
    66<li><a href="#HowTo">HowTo?</a></li> 
    7  
     7<li><a href="#Theory">Theory</a></li> 
    88</ul> 
    99<h5><a name="Description">Description</a></h5> 
     
    1717<h5><a name="HowTo">HowTo?</a></h5> 
    1818<p> 
    19 1. Change the default values of the instrumental parameters as desired, 
    20 and type the qx and qy value where the resolution 
    21 is calculated.  
     191. Select the source and source type (Monochromatic or TOF).  
     20Note that the computational difference between the sources is  
     21only the gravitational contribution due to the mass.</p> 
     22<p> 
     232. Change the default values of the instrumental parameters as desired.</p> 
     24<p> 
     253. The input formats of wavelength and its spread (=FWHM/wavelength) depend on the source type. 
     26<li>For monochromatic wave, the inputs are just one values as shown with the defaults.</li> 
     27<li>For TOF, the min and max values should be separated by "-" to describe the wavelength band range. 
     28Optionally, the input of the wavelength (NOT of the wavelength spread)  
     29could be extended by adding "; ##" where the ## is the number  
     30of the bins for the numerical integration. 
     31Otherwise, the default value "10" bins will be used.  
     32The same number of bins will be used for the corresponding wavelength spread in either cases.</li> 
    2233</p> 
     34<p>4. For TOF, the default wavelength spectrum is flat.  
     35The custom spectrum file (with 2 column text: wavelength(A) vs. intensity)  
     36can also be loaded by selecting "Add new" in the combobox.</p> 
    2337<p> 
    24 2. Select the coordinate system from the radio button. 
    25 </p> 
    26 <p> 
    27 3. Click on the compute button. 
     385. Once set all the input values, click the compute button.  
     39Depending on computation loads the calculation time will vary. 
    2840</p> 
    2941<p>  
    30 4. 1D and 2D dQ will be displayed in the text-box at the bottom of  
     426. 1D and 2D dQ will be displayed in the text-box at the bottom of  
    3143the panel. Two dimensional resolution weight distribution  
    3244(2D elliptical Gaussian function) will also be  
    3345displayed in the plot panel even if the Q inputs are outside  
    3446of the detector limit. 
    35 The red lines indicate the limits of the detector.  
     47The red lines indicate the limits of the detector (if a green lines appear (for TOF),  
     48it indicates the limits of the maximum q range for the largest wavelength  
     49due to the size of the detector). 
     50The summary can be accessed by clicking the 'light-bulb' icon  
     51at the bottom of the SansView main window. 
    3652</p> 
    3753<p><img src="resolution_tutor.gif"> 
     54</p> 
     55<h5><a name="Theory">Theory</a></h5> 
     56<p> 
     57The scattering wave transfer vector is by definition,</p> 
     58<p> 
     59<img src="q.gif" width="600" height="300"> 
     60</p> 
     61<p>In the limit of the small angle, the variance of q in the first order approximation is</p> 
     62<p> 
     63<img src="sigma_q.gif"> 
     64</p> 
     65In summary, the geometric and gravitational contributions depending on the shape of each factors can be expressed   
     66as shown the table.</p> 
     67<p> 
     68<img src="sigma_table.gif"> 
     69</p> 
     70<p> 
     71Finally, we use a Gaussian function to describe the 2D weighting distribution of the uncertainty in q. 
    3872</p> 
    3973</body> 
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