Patent Number: 
Section: claims

1. A system comprising:a plurality of beam generating units disposed proximate to one or more channels, wherein each of the plurality of beam generating units comprises a cavity formed between a cathode wall and an anode wall opposite the cathode wall, and one or more intermediate walls joining the cathode wall and the anode wall, wherein the cathode wall and the anode wall are perpendicular to the one or more channels;a magnetic field generator configured to generate a magnetic field that is orthogonal to the one or more channels; andan electric field generator having a main cathode, a main anode, and a voltage source, the electric field generator configured to generate an electric field between the main cathode and the main anode parallel to the one or more channels. 2. The system of claim 1, further comprising a housing having the one or more channels formed therein, wherein the housing is a vacuum housing, and wherein the plurality of beam generating units is disposed within the housing. 3. The system of claim 1, wherein a length of each of the plurality of beam generating units is less than 9.3 mm. 4. The system of claim 1, wherein the cathode wall comprises a cathode, and wherein the anode wall comprises an anode. 5. The system of claim 1, wherein each of the plurality of beam generating units further comprises a channel opening connecting the cavity to the one or more channels. 6. The system of claim 1, wherein at least two of the plurality of beam generating units are aligned in a row. 7. The system of claim 6, wherein adjacent ones of the row of beam generating units share at least one of a cathode wall and an anode wall with one another. 8. The system of claim 7, wherein the shared wall comprises an aperture for linking cavities of the adjacent ones of the row of the beam generating units. 9. The system of claim 1, wherein the plurality of beam generating units are disposed between the main cathode and the main anode. 10. A method comprising:generating a plurality of streams of charged particles in one or more channels using a plurality of beam generating units, wherein each of the plurality of beam generating units comprises a cavity formed between a cathode wall and an anode wall opposite the cathode wall, and one or more intermediate walls joining the cathode wall and the anode wall wherein the cathode wall and the anode wall are perpendicular to the one or more channels;exposing the plurality of streams to a magnetic field that is orthogonal to the one or more channels; andexposing the plurality of streams to an electric field that is parallel to the one or more channels. 11. The method of claim 10, wherein the magnetic field is approximately 100 Gauss. 12. A system comprising:a housing having one or more channels formed therein;at least one beam generating unit disposed within the housing, the at least one beam generating unit comprising a cavity formed between a cathode wall and an anode wall opposite the cathode wall, and one or more intermediate walls joining the cathode wall and the anode wall wherein the cathode wall and the anode wall are perpendicular to the one or more channels, wherein the cathode wall comprises a cathode the anode wall comprises an anode, and wherein a length of the at least one beam generating unit is less than 9.3 mm;a magnetic field generator configured to generate a magnetic field that is orthogonal to the one or more channels and approximately 100 Gauss; andan electric field generator coupled to the housing, the electric field generator having a main cathode, a main anode, and a voltage source, the electric field generator configured to generate an electric field between the main cathode and the main anode parallel to the one or more channels. 13. The system of claim 1, wherein the magnetic field is approximately 100 Gauss.