I used a vacuum pump for the accelerator tube. This will optimize beam emission off of your source (2 below) as well as ensure you reduce the likelihood of atmospheric conduction and related discharge (can you say 'lightning', quite literally the same as in a storm) Hv ramping circuit... Google 'cw hv circuit'. Run the output of this circuit through a bent coat hanger (copper) for a VERY primitive electron accelerator. This is literally what is in an old CRT television. A cw circuit is typically low current while offering tremendous voltage potential. Alternatively, you could break the glass off of an old incandescent light bulb and use that. Magnetic coils (self wound or hollow core inductors are fine. This is used as beam constrictors/crossovers for focusing and filtering. This will be used to optimize your accelerator A sealable tube to mount your electron gun on one end with at least one port to attach your vacuum pump. Remember too that you will need to mount your condensing coils along the way. The base of the electron gun tube should mount on your sealable specimen chamber (also will be under vacuum) Detectors for the incident beam and beam currents are where things really can get complex... The accelerator is the easy part. There are multiple detection methods of varying complexities and proprietary design. This is where cost and complexity can and likely will come in on your project. Now the disclaimers: HV over 10-15kv will cause the air to become conductive... Hence the above request for a vacuum system. It is not possible to be more precise with this statement because atmospheric conditions (pressure, humidity, etc) dictate the propensity to charge/conduct electricity Further, please note that impact energy electrons will be in the form of kA, kB, and gamma radiation as well as other tertiary, novel energy types which will kill you over time (or instantly if ramped high enough... Say in the MeV range) without proper shielding. In closing and summary: the above is a basic linear electron accelerator. There are variants that can operate at near atmospheric pressure.
