Current the example has a 14MeV source

my_source.energy = openmc.stats.Discrete([2.5e6], [1]) 

Or you can do something better with the openmc.stats.muir distribution

my_source.energy = openmc.stats.muir(e0=2500000.0, m_rat=4.0, kt=20000.0)

I can offer more complex mixed sources if that helps

When you mention the source, are you referring to the electric potential generated, modelled as a point source, or discrete ions? Is this how you recommend implementing Deuterium over Tritium?

Essentially, my team has a spherical IEC device, and we use a deuterium fuel. I am curious if there are ways to modify the existing code to reflect our specific reactor shape, fuel source, and operating values (i.e. voltage, pressure, temp)? We need to develop a simulation model and submit results to our national board in order to gain experimental approval.

And we are specifically looking to model the Bremsstrahlung radiation/ X-Ray Emission?

When you mention the source, are you referring to the electric potential generated, modelled as a point source, or discrete ions? Is this how you recommend implementing Deuterium over Tritium?

openmc can offer photon or neutrons for the source term. The code is a monte carlo particle transport code and doesn't know about electric potential. To change the code to model neutrons from DD instead of neutrons from DT then you can simple change the neutron energy from 14MeV to 2.5MeV

Essentially, my team has a spherical IEC device, and we use a deuterium fuel. I am curious if there are ways to modify the existing code to reflect our specific reactor shape, fuel source, and operating values (i.e. voltage, pressure, temp)? We need to develop a simulation model and submit results to our national board in order to gain experimental approval.

Yes OpenMC and DAGMC can support different geometry types. Perhaps have a look at the documentation
https://docs.openmc.org/en/stable/usersguide/geometry.html

And we are specifically looking to model the Bremsstrahlung radiation/ X-Ray Emission?

Yes openmc can simulate photons. change the my_source.particle=='photon' as it defaults to neutron