HRPD Parameters file

[Nick Draper]

From Aziz (therefore I'm pretty sure this is HRPD):

Playing with the new _parameters.xml file I finally understood why guesses were computed wrong : There is no need for inserting a conversion factor in the “Fullprof formulaes” : these can be literally used as they are. However, since the formulae parametrize a peak profile in TOF, the proper behaviour is obtained by setting all results units in <TOF> as follows:

<component-link name="bank_bsk" >
  <parameter name="BackToBackExponential:S" type="fitting">
    <formula eq="sqrt(7.429*centre^4+132.188*centre^2)" unit="dSpacing" result-unit="TOF" />
  </parameter> 
  <parameter name="BackToBackExponential:A" type="fitting">
    <formula eq=" 0.086851/centre" unit="dSpacing" result-unit="TOF" /> <fixed />
  </parameter>   
  <parameter name="BackToBackExponential:B" type="fitting">
    <formula eq=" 0.005047/(centre^4)+0.023347" unit="dSpacing" result-unit="TOF" /> <fixed />
  </parameter>  
</component-link>

[Martyn Gigg]

Anders said he didn't understand why this change should actually make any difference given the factor that was removed should have been exactly the same as setting the result to dSpacing.

[Anders Markvardsen]

(In [10463]) Bring BackToBackExponentialTest back into live. re #2578.

[Anders Markvardsen]

(In [10591]) Updated HRPD parameter file.

Tested that it works for the 1st bank in TOF and dSpacing and for focussed data for all 3 banks in dspacing.

Taken out temporary TOF-dSpacing constants once put in as a temporary measure while code for param units was developed.

re #2578

[Anders Markvardsen]

(In [10596]) Fix broken test.

re #2578

[Stuart Campbell]

This ticket has been transferred to github issue ​3425