Colorado State University Research Foundation

Other

Martinez, Rafael a.

Williams, John D.

Rand, Lauren P.

Rafael A Martinez

John D Williams

Casey C Farnell

Joel A Moritz, Jr

Lauren P Rand

Matthew S Muraczewski

Lars Lindskog

Brian J Morton

Stephen C Iverson

Kevin B Graves

Bryan S Petrofsky

A miniature Hall current plasma source apparatus having magnetic shielding of the walls from ionized plasma, an integrated discharge channel and gas distributor, an instant-start hollow cathode mounted to the plasma source, and an externally mounted keeper, is described. The apparatus offers advantages over existing other Hall current plasma sources having similar power levels, including: lower mass, longer lifetime, lower part count including fewer power supplies, and the ability to be continuously adjustable to lower average power levels using pulsed operation and adjustment of the pulse duty cycle. The Hall current plasma source can provide propulsion for small spacecraft that either do not have sufficient power to accommodate a propulsion system or do not have available volume to incorporate the larger propulsion systems currently available. The present low-power Hall current plasma source can be used to provide energetic ions to assist the deposition of thin films in plasma processing applications.

Hall current plasma source having a center-mounted cathode or a surface-mounted cathode

A miniature Hall current plasma source apparatus having magnetic shielding of the walls from ionized plasma, an integrated discharge channel and gas distributor, an instant-start hollow cathode mounted to the plasma source, and an externally mounted keeper, is described. The apparatus offers advantages over other Hall current plasma sources having similar power levels, including: lower mass, longer lifetime, lower part count including fewer power supplies, and the ability to be continuously adjustable to lower average power levels using pulsed operation and adjustment of the pulse duty cycle. The Hall current plasma source can provide propulsion for small spacecraft that either do not have sufficient power to accommodate a propulsion system or do not have available volume to incorporate the larger propulsion systems currently available. The present low-power Hall current plasma source can be used to provide energetic ions to assist the deposition of thin films in plasma processing applications.

Hall current plasma source having a center-mounted or a surface-mounted cathode

A compact assembly for retaining a bass drum in position on a playing surface while it is played by a drummer seated on a drum stool. The compact assembly includes a mat component having a length and a width. The length of the mat component is sufficient to allow both a bass drum and a drum stool to be operatively positioned on opposite ends thereof while the mat component is disposed in an open operative configuration. A retention component comprises a retention member secured to a portion of one end of the mat component, and a cushion member is affixed to at least one side of the retention member. The cushion member engages a portion of the bass drum when the bass drum is disposed in an operative orientation on the mat component, thereby retaining the bass drum in position while a drummer is playing.

Compact assembly and system for retaining a bass drum in position

The use of the electride form of 12CaO-7AlO, or C12A7, as a low work function electron emitter in a hollow cathode discharge apparatus is described. No heater is required to initiate operation of the present cathode, as is necessary for traditional hollow cathode devices. Because C12A7 has a fully oxidized lattice structure, exposure to oxygen does not degrade the electride. The electride was surrounded by a graphite liner since it was found that the C12A7 electride converts to it's eutectic (CA+C3A) form when heated (through natural hollow cathode operation) in a metal tube.

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12CaO-7Al2O3 electride hollow cathode

A multi-stop depth control for a milling machine is disclosed which includes a fixed member connected to the milling machine frame having a rotatable wheel mounted thereon. The wheel carries a plurality of stop posts each with a stop member. Each stop is engageable with a through bore of a movable part of the milling machine which is connected to the movable quill thereof. By rotating a selected one of the posts into alignment with the movable part of the milling machine a selected depth of movement for the movable part of the milling machine is established.

Multi-stop depth control

Growing community of inventors

Redmond, WA, United States of America

Rafael A Martinez