Muon Unscripted Testing: PSI

Introduction

These are unscripted tests for PSI data and introduce background corrections. For continous sources background corrections are very important. Fitting a flat background to the data (sometimes along with a exp decay), it is possible to remove the background from the data.

Loading Data Test

  • Open Muon Analysis

  • On the Home tab set the instrument to PSI

  • The load current run button should be greyed out

  • Load dolly 1529 using the Browse button

  • Set Rebin to Fixed and enter a value of 5

  • You will get 4 lines that all curve upwards

  • If you tick the Plot raw option the data will change

Auto Background Corrections Test

  • Go to the Corrections tab

  • For the Background select Auto

  • The plots will now average around 0

  • The values should be (approximatley):

    • Forw: 19.2

    • Back: 93.6

    • Left: 104.4

    • Rite: 77.2

  • Tick the use Raw box and the values will change

  • The new values should be similar (within 1) to before

Flat Background Corrections Test

  • Change the Select Function to Flat Background

  • The curves will be curved upwards again and the table will report an error

  • The Corrections tab will show a red asterisk

  • Go to the Home tab

  • Untick Time Zero

  • Switch the plot from Asymmetry to Counts

  • Set the Time Zero to be 0

  • The plots will now show a large peak, prior to this is only background

  • Using the options at the bottom of the plot, set the x range from 0.0 to 1.0

  • Go to the Corrections tab

  • Change the Start X to 0.0, it will automatically change to 0.006

  • Change the End X to just before the peak in the plot

  • This will fit a flat background to the data before the peak

  • The results should be similar to before

Manual Background Corrections Test

  • Change the plot back to Asymmetry

  • Change the Background to Manual

  • Untick the Apply parameter change to all domains

  • Change some of the background values, but leave some as they are

  • Go to the Home tab

  • Tick the Time Zero box

  • The plots that you changed will drift away from zero at large times

  • The plots that you did not change will average around zero