Hello. I'm not sure if this question is to project-specific, but I will try to explain as best that I can. I am working with a system such as this one, with only a few differences: http://www.sciencedirect.com/science/article/pii/S0168583X1400706X it is a cryogenic stopping cell. The part I am running simulations on is the RF carpet. The current carpet configuration uses a sinusoidal wave for the RF amplitude. I am running simulations on a carpet that would use a rectangular wave, with 4 electrodes. I can change the frequency of these electrodes. I set the phase shifts to 0, 180, 0, 180 over the electrodes. I was testing different phase shifts, and now I am testing this one. In principle, I test to see how many ions can get extracted from the system (transmission efficiency) When I test this rectangular wave with a frequency of 1MHz, it takes an RF Amplitude of 76V to get 100% transmission efficiency. When I test it with 3MHz, it only takes 14V to get 100% transmission efficiency. What would explain why a higher frequency requires a lower voltage for ion extraction? I hope this was well explained. let me know if there are more explanations needed.