  For quantum systems or materials, a common procedure for probing their
behaviour is to tune electronic/magnetic properties using external parameters,
e.g. temperature, magnetic field or pressure. Pressure application as an
external stimuli is a widely used tool, where the sample in question is
inserted into a pressure cell providing a hydrostatic pressure condition. Such
device causes some practical problems when using in Muon Spin
Rotation/Relaxation ($\mu^+$SR) experiments as a large proportion of the muons
will be implanted in the pressure cell rather than in the sample, resulting in
a higher background signal. This issue gets further amplified when the
temperature dependent response from the sample is much smaller than that of the
pressure cell,which may cause the sample response to be lost in the background
and cause difficulties in aligning the sample within the beam. To tackle this
issue, we have used pySRIM to construct a practical and helpful simulation tool
for calculating muon stopping fractions, specifically for the pressure cell
setup at the $\mu$E1 beamline using the GPD spectrometer at the Paul Scherrer
Institute, with the use of TRIM simulations. The program is used to estimate
the number of muon stopping in both the sample and the pressure cell at a given
momentum. The simulation tool is programmed into a GUI, making it accessible to
user to approximate prior to their experiments at GPD what fractions will
belong to the sample and the pressure cell in their fitting procedure.
