Acceleration of protons in a Luce diode with a Teflon anode

The number of protons collectively accelerated in a Luce diode with a Teflon anode was determined from the activity of the $^{13}$N radionuclide formed in a graphite target by the nuclear reaction $^{12}$C$(p,\gamma)^{13}$N. It is shown that the average number of protons accelerated per shot at a chamber residual atmosphere pressure of 3 $\cdot$ 10$^{-5}$ and 2 $\cdot$ 10$^{-4}$ Torr is approximately the same within the error, and the efficiency of direct capture of protons into acceleration from the residual atmosphere does not exceed 0.25%. It is also shown that, due to the hydrophobicity of polytetrafluoroethylene, the number of protons captured in acceleration ($\sim$4 $\cdot$ 10$^{12}$) is on average an order of magnitude lower compared to the use of anodes made of polyethylene (10$^{14}$), BN (5 $\cdot$ 10$^{13}$) и Al$_2$O$_3$ (3 $\cdot$ 10$^{13}$).