公开(公告)号：US20060033417A1

公开(公告)日：2006-02-16

申请号：US10917309

申请日：2004-08-13

Applicant: Triveni Srinivasan-Rao ,  Ilan Ben-Zvi ,  Jorg Kewisch ,  Xiangyun Chang

Inventor： Triveni Srinivasan-Rao ,  Ilan Ben-Zvi ,  Jorg Kewisch ,  Xiangyun Chang

IPC: H01J31/00 ,  H01J31/26 ,  H01J31/48 ,  H01J43/04

CPC classification number: H01J3/021 ,  H01J23/06 ,  H01J25/04 ,  H05H15/00

Abstract: An electron gun for generating an electron beam is provided, which includes a secondary emitter. The secondary emitter includes a non-contaminating negative-electron-affinity (NEA) material and emitting surface. The gun includes an accelerating region which accelerates the secondaries from the emitting surface. The secondaries are emitted in response to a primary beam generated external to the accelerating region. The accelerating region may include a superconducting radio frequency (RF) cavity, and the gun may be operated in a continuous wave (CW) mode. The secondary emitter includes hydrogenated diamond. A uniform electrically conductive layer is superposed on the emitter to replenish the extracted current, preventing charging of the emitter. An encapsulated secondary emission enhanced cathode device, useful in a superconducting RF cavity, includes a housing for maintaining vacuum, a cathode, e.g., a photocathode, and the non-contaminating NEA secondary emitter with the uniform electrically conductive layer superposed thereon.

公开(公告)号：US07227297B2

公开(公告)日：2007-06-05

申请号：US10917309

申请日：2004-08-13

Applicant: Triveni Srinivasan-Rao ,  Ilan Ben-Zvi ,  Jorg Kewisch ,  Xiangyun Chang

Inventor： Triveni Srinivasan-Rao ,  Ilan Ben-Zvi ,  Jorg Kewisch ,  Xiangyun Chang

IPC: H01J31/48

CPC classification number: H01J3/021 ,  H01J23/06 ,  H01J25/04 ,  H05H15/00

Abstract: An electron gun for generating an electron beam is provided, which includes a secondary emitter. The secondary emitter includes a non-contaminating negative-electron-affinity (NEA) material and emitting surface. The gun includes an accelerating region which accelerates the secondaries from the emitting surface. The secondaries are emitted in response to a primary beam generated external to the accelerating region. The accelerating region may include a superconducting radio frequency (RF) cavity, and the gun may be operated in a continuous wave (CW) mode. The secondary emitter includes hydrogenated diamond. A uniform electrically conductive layer is superposed on the emitter to replenish the extracted current, preventing charging of the emitter. An encapsulated secondary emission enhanced cathode device, useful in a superconducting RF cavity, includes a housing for maintaining vacuum, a cathode, e.g., a photocathode, and the non-contaminating NEA secondary emitter with the uniform electrically conductive layer superposed thereon.

Abstract translation: 提供了一种用于产生电子束的电子枪，其包括二次发射器。 二次发射体包括无污染的负电子亲和力（NEA）材料和发射表面。 枪包括从发射表面加速次级的加速区域。 响应于在加速区域外部产生的主波束发射次级。 加速区域可以包括超导射频（RF）腔，并且枪可以以连续波（CW）模式操作。 二次发射体包括氢化金刚石。 均匀的导电层叠加在发射器上以补充提取的电流，防止发射极的充电。 可用于超导RF空腔的封装的二次发射增强型阴极器件包括用于维持真空的壳体，阴极（例如光电阴极）以及其上叠加有均匀导电层的无污染NEA次级发射器。