Abstract: A compact string tensioning tuning assembly for a stringed instrument comprising two or more worm gear tuners where the tuner worm gears are in axial alignment and individual tuners are rotationally positioned around the worm gear axis such that the tuner knobs are separated from each other and finger access to individual tuner knobs is improved.

Abstract: A closed drift ion source is provided, having an anode that serves as both the center magnetic pole and as the electrical anode. The anode has an insulating material cap that produces a closed drift region to further increase the electrical impedance of the source. The ion source can be configured as a round, conventional ion source for space thruster applications or as a long, linear ion source for uniformly treating large area substrates. A particularly useful implementation uses the present invention as an anode for a magnetron sputter process.

Abstract: A closed drift ion source is provided, having an anode that serves as both the center magnetic pole and as the electrical anode. The anode has an insulating material cap that produces a closed drift region to further increase the electrical impedance of the source. The ion source can be configured as a round, conventional ion source for space thruster applications or as a long, linear ion source for uniformly treating large area substrates. A particularly useful implementation uses the present invention as an anode for a magnetron sputter process.