Muon Testing¶

Preparation ¶

For these tests you will be using the files; EMU00051341-51343.nxs for Ionic Diffusion Test, EMU00020882-20900.nxs for Superconducting Copper Test, HIFI000134028-13439 for HIFI Transverse Field Simultaneous Fitting, and MUSR62260 for Transverse Field Asymmetry Test. You will need access to the data archive for this which can be activated through manage user directories.

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 Flat Background (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
- Do the same but this time choose Fix all, then click Ok
- Click Fit
Go to the Results tab
- At the bottom of the interface, click Output Results
- A table should appear in the workspaces toolbox called Results Table
Click on the main Workbench window and open the results table
Expected Values are (similar to within 50%):
- f0.A0: -0.0467
- f1.Asym: 0.155
- f1.Delta: 0.389
- f1.Nu: 0.474
In the plotting window click the External Plot button
You should get a plot that looks like the following:

Time required 5 - 10 minutes

Open Muon Analysis (Interfaces > Muon > Muon Analysis)
Change Instrument to EMU, found in the Home tab
Load run 20889-20900
Using the > button, step through a couple files (Plot should update each time)
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
- In the Log Values table, check run_number and Field_Danfysik
- Click Output Results
Go to the Model Fitting tab
Set the Select Data to field_danfysik and Lambda
The plot will look similar to the one below
Add a peak function (e.g. Gaussian)
You should be able to fit to the data

Time required 5 - 10 minutes

Open Muon Analysis (Interfaces > Muon > Muon Analysis)
Change Instrument to HIFI, found in the Home tab
Load runs 134028-39
Go to the Grouping tab
- In the Pair table, click Guess Alpha
- In the resulting dialog, change the run to HIFI134034 to be used for the calculation
- A value close to 1.3 should appear
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 Flat Background (Background > Flat Background)
- Similarly, add ExpDecayOsc (Muon > MuonGeneric > ExpDecOsc)
- Set all parameters to Global, except Frequency
- Click Fit
The fit should fail with a large Chi value (>100)
Now to try the fit a different way.
- Click Undo Fits
- Click the value for the Frequency parameter; A ... should appear next to it, click it. A new window should appear
- Enter values for each run in the table as from 0.0 to 1.1 in steps of 0.1
- Click Ok
- Click Fit
This time the fit should work with a significantly lower value for Chi squared (<10)
Back in the main workbench window, expand the fitting workspace and pick one of the fitted workspaces
Double click and with plot type as Individual, click Plot All
You should get plots that look like this:

Time required 5 minutes

Time required 5 minutes

Open Muon Analysis (Interfaces > Muon > Muon Analysis)
Change Instrument to ARGUS, found in the Home tab
Load run 71799
Go to the Grouping tab
- click Guess Alpha, should get 0.95
Load the next run
Go to the Fitting tab
- Add a StaticKuboToyabeTimeExpDecay and FlatBackground
- Click the Fit button
Expected Values are (similar):
- A: 0.13
- Delta: 0.52
- Lambda: 0.11
- A0: 0.07

Time required 5 minutes This users the same sample as the single pulse test

Open Muon Analysis (Interfaces > Muon > Muon Analysis)
Change Instrument to ARGUS, found in the Home tab
Load run 71796
Set to Double Pulse
Go to the Grouping tab
- click Guess Alpha, should get 0.93
Load the next run
Go to the Fitting tab
- Add a StaticKuboToyabeTimeExpDecay and FlatBackground
- click the Fit button
Expected Values are (similar):
- A: 0.12
- Delta: 0.55
- Lambda: 0.13
- A0: 0.09
These values are slightly different from the single pulse results
Load run 71796
Go to the Home tab
- Change back to Single Pulse
- Untick the Time zero and set the value to 0.493
Go to the Grouping tab
- Click Guess Alpha, should get 0.91
Load the next run
Go to the Fitting tab
- Add a StaticKuboToyabeTimeExpDecay and FlatBackground
- Click the Fit button
Expected Values are (similar):
- A: 0.12
- Delta: 0.59
- Lambda: 0.14
- A0: 0.1

If at any point data cannot be loaded check your manage user directories to see if you have turned on archive search.
If you cannot see all the runs once you reach the ... step for a simultaneous fit, go back to the Fitting tab and make sure Simultaneous fit over is checked and it is over Group/Pair, not Run