Merge pull request #13999 from mantidproject/13997_source_z_pos

Fix Bilby IDF and Loader for Source Position based on Logs

Framework/DataHandling/src/LoadBBY.cpp

@@ -405,6 +405,7 @@ void LoadBBY::exec() {
       createChildAlgorithm("LoadInstrument");
   loadInstrumentAlg->setProperty("Workspace", eventWS);
   loadInstrumentAlg->setPropertyValue("InstrumentName", "BILBY");
+  loadInstrumentAlg->setProperty("RewriteSpectraMap", false);
   loadInstrumentAlg->executeAsChildAlg();
 
   setProperty("OutputWorkspace", eventWS);
@@ -826,4 +827,4 @@ void BbyDetectorBankFactory::createAndAssign(size_t startIndex,
 }
 
 } // DataHandling
-} // Mantid
\ No newline at end of file
+} // Mantid

instrument/Bilby_Definition.xml

@@ -26,7 +26,7 @@
   <component name="Source" type="source">
     <location x="0.0" y="0.0" />
     <parameter name="z"> 
-      <logfile id="L1_chopper_value" eq="1*value"/>
+      <logfile id="L1_chopper_value" eq="-1*value"/>
     </parameter>
   </component>
   <type name="source" is="Source" />
@@ -503,4 +503,4 @@
    
   
 </instrument>
-  
\ No newline at end of file
+