Muon Unscripted Testing: EMU

Introduction

These tests are for the EMU instrument at ISIS. This section will show some advance fitting and plotting features of the GUI. It would be worth closing the muon GUI and clearing the ADS before doing the second test. This is to give a clean state so it is easier to find the correct results table.

Ionic Diffusion Test

Time required 5 - 10 minutes

  • Open Muon Analysis (Interfaces > Muon > Muon Analysis)

  • Change Instrument to EMU, found in the Home tab

  • Load runs 51341-3

  • Go to the Fitting tab

    • Check the Simultaneous fit over checkbox, and change from Run to Group/Pair

    • Right click the empty table area; Select Add Function

    • Add a FlatBackground (Background > Flat Background)

    • Similarly, add DynamicKuboToyabe (Muon > MuonGeneric > DynamicKuboToyabe)

    • Check the Global checkbox for the parameters A0, Asym, Delta and Nu

    • Set A0 = 0.05, Asym = 0.15, Delta = 0.2 and Nu = 0.1

    • Click the value for the Field parameter; A ... should appear next to it, click it. A new window should appear

    • Check the box called Log

    • Change the log to be field_danfysik

    • Click a row in the table

    • Click the Set drop down menu and choose Set all to log

    • The values should be roughly 0, 5 and 10.5

    • Do the same but this time choose Fix all, then click Ok

    • Click Fit

  • Expected Values are (similar to within 50%):

    • f0.A0: -0.0467

    • f1.Asym: 0.155

    • f1.Delta: 0.389

    • f1.Nu: 0.474

  • Tick Plot Difference check box

  • In the plotting window click the External Plot button

  • You should get a plot that looks like the following:

MATestingIDF.png
  • Go to the Fitting tab

    • Remove the DynamicKuboToyabe function

    • Uncheck the Simultaneous fit over checkbox

    • Press fit

    • Tick the Exclude Range option in the table

    • Enter values of 0 to 6

    • Press fit, notice that the fit line moves to lower y values

Superconducting Copper Test

Time required 5 - 10 minutes

To use the Model Fitting tab see the Muon Feature Flags documentation. You will need to set model_analysis:2 before opening Workbench and starting this test.

  • Open Muon Analysis (Interfaces > Muon > Muon Analysis)

  • Change Instrument to EMU, found in the Home tab

  • Load run 20889-20900

  • Go to the Fitting tab

    • Right click the empty table area; Select Add Function

    • Add ExpDecayMuon (Muon > MuonGeneric > ExpDecMuon)

  • Go to the Sequential Fitting tab

    • Click Sequentially Fit All

  • Go to the Results tab

    • At the bottom of the interface, click Output Results

    • Notice that the text for the output button is now in red (to warn the user they will overwrite it)

    • Change the name to “Results2” and it will turn black again

    • Above the log values table is a case sensitive search bar

    • Add the “run_number” and “Field_Danfysik” logs by ticking them

    • Click Output Results

  • Go to the Model Fitting tab

    • In the Results table combobox you will see that two options are listed

    • Pick “Results2”

    • Set the Select Data to “Field_Danfysik” and “Lambda”

    • The plot will look similar to the one below (but a scatter plot)

    • Add a peak function (e.g. Gaussian)

    • Move the peak centre to around 79

    • You should be able to fit to the data

    • Pressing the Covariance Matrix button will give a pop up containing it

    • Ticking the Errors box below the plot will show the error bars on the data along with a shaded region

    • Change Plot guess using to “Uniform points across data range”

    • Tick Plot guess, a smooth curve will appear

  • The x and y values below the plot can be used to zoom in on specific regions of the data

Cu-fitting.png