公开(公告)号：US06612105B1

公开(公告)日：2003-09-02

申请号：US09674463

申请日：2001-01-29

Applicant: Arnold W. Voigt ,  David Q. King ,  Kristi H. De Grys ,  Roger M. Myers

Inventor： Arnold W. Voigt ,  David Q. King ,  Kristi H. De Grys ,  Roger M. Myers

IPC: H01J152

CPC classification number: F03H1/0075 ,  F03H1/0012

Abstract: A system for uniformly distributing propellant gas in a Hall-effect thruster (10) (HET) includes an anode (42, 42′) and a porous material gas distributor (60, 89) (PMGD). The porous material (120) may be porous metal or porous ceramic. Propellant gas is directed from a supply to the PMGD for distribution into a gas discharge region (16) of the HET (10). The gas flows through the porous material (120) of the PMGD and out of the PMGD's exit surface (71) into the annular gas discharge region (16). The PMGD has an average pore size, pore density and thickness that are optimized to control the flow of the gas at the desired flow rate and distribution uniformity at a relatively short distance downstream from the PMGD. This feature allows HET to be short, significantly decreasing susceptibility to vibration problems encountered during vehicle launch. The PMGD can include a shield (79, 80) for preventing contaminants from traveling upstream from the gas discharge region from adhering to the porous metal. The shield may be integrated into the PMGD or be a separate shield. In addition, the shield may be perforated so as to allow gas to pass through the shield to further decrease the distance needed to achieve uniform gas distribution. Alternatively, the exit surface (71) of the porous metal may be oriented to face perpendicularly from the gas discharge path out of the HET, which significantly reduces the probability of contaminants adhering to the exit surface.

Abstract translation: 用于在霍尔效应推进器（10）（HET）中均匀分布推进剂气体的系统包括阳极（42,42'）和多孔材料气体分配器（60,89）（PMGD）。 多孔材料（120）可以是多孔金属或多孔陶瓷。 推进剂气体从电源引导到PMGD以分配到HET（10）的气体放电区域（16）中。 气体流过PMGD的多孔材料（120）并流出PMGD的出射表面（71）进入环形气体放电区域（16）。 PMGD具有平均孔径，孔密度和厚度，其被优化以在PMGD下游相对较短的距离处以期望的流速和分布均匀性控制气体的流动。 该功能允许HET短路，显着降低车辆启动过程中遇到的振动问题的易感性。 PMGD可以包括用于防止污染物从气体放电区域上游行进的屏蔽件（79,80）粘附到多孔金属上。 屏蔽可以集成到PMGD中，或者是一个单独的屏蔽。 此外，屏蔽件可以被穿孔以允许气体通过屏蔽件，以进一步减小实现均匀气体分布所需的距离。 或者，多孔金属的出口表面（71）可以被定向为从HET之外的气体排出路径垂直地面对，这显着降低了污染物附着到出射表面的可能性。

公开(公告)号：US06605818B1

公开(公告)日：2003-08-12

申请号：US10112183

申请日：2002-03-28

Applicant: David G. Cornog ,  Kevin Tu ,  Roderick A. Bulante

Inventor： David G. Cornog ,  Kevin Tu ,  Roderick A. Bulante

IPC: H01J152

CPC classification number: H05K9/0024 ,  G21F1/08 ,  G21F1/085 ,  H05K9/0049 ,  H05K9/0092

Abstract: A housing and the structure within its interior is protected by spraying a protective coating overlying and contacting at least a portion of the housing. The protective coating is an ionizing radiation protective material such as a neutron-shielding material, a gamma-ray/X-ray shielding material, and a capture gamma-ray suppression material. The protective coating is at least about 0.020 inch thick.

Abstract translation: 外壳和其内部的结构通过喷涂覆盖并接触壳体的至少一部分的保护涂层来保护。 保护涂层是电离辐射保护材料，例如中子屏蔽材料，γ射线/ X射线屏蔽材料和捕获伽马射线抑制材料。 保护涂层至少约0.020英寸厚。

公开(公告)号：US06404133B1

公开(公告)日：2002-06-11

申请号：US09536038

申请日：2000-03-27

Applicant: Yukio Uchida ,  Tomoaki Iwamoto ,  Katsuyo Iwasaki

Inventor： Yukio Uchida ,  Tomoaki Iwamoto ,  Katsuyo Iwasaki

IPC: H01J152

CPC classification number: H01J29/003 ,  H01J2229/0015

Abstract: Two closed-loop coils are respectively set at the top or the bottom of a cathode ray tube. These two closed-loop coils serves in a pair as a cancel coil. Each closed-loop coil is positioned so as to make an interlinkage with the magnetic field leakage that escapes from the deflection yoke, a part of the closed-loop coil running almost in parallel to the top or bottom edge of an effective display region of a front panel.

Abstract translation: 两个闭环线圈分别设置在阴极射线管的顶部或底部。 这两个闭环线圈成对地用作消除线圈。 每个闭环线圈被定位成与从偏转线圈逸出的磁场泄漏形成互连，闭环线圈的一部分几乎平行于一个有效显示区域的顶部或底部边缘 前面板。