Changeset 5555

Timestamp:

May 3, 2023 1:59:30 PM (7 months ago)

Author:

toby

Message:

expand simulations tutorial w/r to scale factor & "edit range" reset

File:

• Tutorials/Simulation/SimTutorial.htm (modified) (3 diffs)

Tutorials/Simulation/SimTutorial.htm

@@ -753 +753 @@
 "Times New Roman"'><o:p></o:p></span></p>
 
+<A name="fraction">
 <h2><span style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:
-"Times New Roman"'>Step 3: Set Phase Fractions<o:p></o:p></span></h2>
+"Times New Roman"'>Step 3: Set Scale Factor/Phase Fractions<o:p></o:p></span></h2></A>
 
 <p class=MsoNormal><!--[if gte vml 1]><v:shape id="Picture_x0020_1" o:spid="_x0000_s1026"
@@ -869 +870 @@
 "Times New Roman"'><o:p></o:p></span></p>
 
+<A name="scale">
 <h2>Step 5: Change Histogram Scale Factor</h2>
+</A>
 
 <p class=MsoNormal><span style='font-size:12.0pt;mso-fareast-font-family:"Times New Roman";
@@ -958 +961 @@
 </div>
 
+<h2>Step 7: Visualizing Parameter Changes on the Pattern (optional)</h2>
+Since the "observed" diffraction pattern is set only on the first
+"Refine" computation, if any parameter, such as a lattice,
+profile or atomic parameter is changed, and a "Refine" computation is
+repeated after making the change, only the computed pattern is changed
+so the difference curve will show the impact of the change,
+superimposed on simulated counting statistics noise.
+<P>
+To reset the "observed" diffraction pattern to match the current
+computed pattern, use the histogram's "Edit Range" button. 
+used to reset this. The range does not actually need to be changed in
+this step to
+force this. Simply opening the window and pressing "Save" to resave
+the old values will cause the "observed" diffraction pattern to be
+recomputed the next time that Calculate/Refine is used. 
+
+
+<H3>Problems</H3>
+The most common problem that is encountered is that after performing a
+simulation, the diffraction intensities are too small to be seen. This
+is addressed by increasing the histogram scale factor <A
+href="#scale">(discussed in Step 5)</A>. Then invoke the
+Calculate/Refine menu command. Note that the "observed"
+pattern will remain at the initially computed values after performing
+the calculation, unless the histogram's "Edit Range" button is used to
+reset this prior.
+
+
+
 </body>