Meet Jane, a traveling medical physicist. Jane enjoys traveling as a medical physicist to aid in advancing the knowledge and skill of physicists in LMICs. 

Jane isn't just any medical physicist, Jane is a self-proclaimed LINAC-mathpreneur. 

Jane has been focused on helping physicists in LMICs be able to troubleshoot and self-diagnose failures that may occur in their linear accelerators.

Jane has noticed there is a clear environmental factor that is not experienced in HICs, but that is prominent in LMIcs and affects the performance of the linac. 

Not only are there more failures in the linacs residing in LMICs, but there are fewer engineers who know how to diagnose and fix these mechanical issues. 

Jane decided to travel to a hospital in Nigeria and put her LINAC-mathpreneur gift to the test and get to the bottom of these mechanical issues using the power of math and physics. 

Jane visited a clinic where the physicists said they had just experienced some power supply fluctuations.

Initially, after the power dip, they were unable to obtain any beam data.

Jane realized that the power dip decreased the vacuum pressure due to low ion pump rate and also inhibited the RF power source from pulsing at a frequency above the cutoff frequency of the LINAC. 

Jane explained this revelation to the chief physicist at the clinic. She told her that the cutoff frequency of an electromagnetic waveguide is the lowest frequency for which a mode will propagate in it.

Jane broke down linac failures into 12 categories. She found that the vacuum subsystem only failed in the LMIC centers, not in the HIC centers, and the failure rate in an LMIC environment was the most common failure. 

The cause for failures due to inadequate vacuum pumping from fluctuations in power supply led Jane to create a new Low power RF conditioning method for LMICs. This prepares the vacuum to remain stable at low power.

This would allow the physicists to treat the failure and prepare their linacs for future power shortages. 

Jane also worked with a the local engineer to build uninterruptible power supplies (UPS) that support the vacuum during periods of power failure. A story for another time.