The function of WiMDA is to analyse and display the data collected from SR experiments. As a Windows-based application, WiMDA is designed to be convenient and easy to use on the most universally available computing platform. The program enables an experimenter to work with their data both during and after their experiment, to view the data, to fit the data to a standard and user programmed models, to plot fit parameters, and, if required, to perform frequency spectrum analysis.
Although WiMDA is designed to work with data originating from many different muon sources, the emphasis of this manual is mainly on the use of WiMDA with ISIS data. However, some additional features related to PSI, KEK and TRIUMF data are partly covered.
The WiMDA data analysis programme was written by Francis Pratt. Any comments or suggestions about the WiMDA programme or this manual should be emailed to firstname.lastname@example.org
WiMDA can be downloaded from http://www.isis.rl.ac.uk/muons/wimda/index.htm
Installation instructions can also be found on this site.
It is particularly important to note the environment variable gle_top must be set to the root directory where gle is installed and the correct command line invocation (e.g. c:\gle\gle_ps.exe) must be listed in the wimda.ini file. If this is not done WiMDA will be unable to produce postscript plots of the results.
Windows 95 and 98
Go into the autoexec. bat file and write gle_top = root directory where gle is installed, e.g. gle_top= d:\Wimda\gle3.5\
Start settings control panel environment. Then write GLE_TOP in the variable box and put the location of the root directory in the value box e.g. d:\Wimda\gle3.5\
My computerproperties advancedenvironment variables. Then same as for Windows NT
Figure 1.1 Methods for setting an environment variable in Windows.
Figure 1.2. Setting environment variable gle_top in Windows XP.
The following data is displayed in the dialogue box.
Run Number file name
Title title allocated by the user.
Temperature mean average experimental temperature in Kelvin. This value can either be taken from the temperature log from the label stored in the file or entered by the user by selecting the appropriate option from the Optionssub menu in the Fit Table (see Analysis section 7.10)
Field magnetic field value during experiment as entered by user in Gauss
Comment notes made by the user, often sample type.
A different file can be viewed by either clicking on STEP, LOAD or typing the run number into the field. STEP>> or < increase or decrease the run number by 1 without loading a file. LOAD>> or < increase or decrease the run number by 1 and then load the corresponding data file. LOAD loads in the run number that is in the dialogue box.
CO-ADD allows the user to add together the data in of two or more runs. An average result weighted by the number of events in each run in produced. CO-ADD>> or < add together the present run with the run number one higher or lower. CO-ADD adds the current run to the next run number to be entered into the dialogue box.