Kimball Lanthanum Hexaboride Cathode with Guard Ring 带防护环的六硼化镧阴极

Description

The Kimball Physics ES-423GR Guard Ring Lanthanum Hexaboride (LaB₆) Cathode is a high performance, resistively heated, thermionic electron source. It is currently employed in many brightness-limited electron optical systems: SEM’s, TEM’s, probes, electron lithography systems, and more. Kimball Physics ES-423GR防护环六硼化镧（LaB6）阴极是一种高性能、电阻加热的热离子电子源。目前，它被用于许多亮度受限的电子光学系统：SEM、TEM、探针、电子光刻系统等。 The design of the crystal geometry is similar to the conical shape with a microflat tip found in the LaB6 ES-423E design. However, this advanced design optimizes emission from the microflat region and suppresses emission from the inclined conical surface by utilizing the additional guard ring structure without requiring elevated electric fields from the Wehnelt/grid. 晶体几何形状的设计类似于LaB6 ES-423E设计中的具有微平面尖端的锥形。然而，这种先进的设计优化了来自微平面区域的发射，并通过利用额外的保护环结构抑制了来自倾斜锥形表面的发射，而不需要来自Wehnelt/栅极的升高的电场 The exposed emitter surface can range from 10 µm to 250 µm diameter, with a standard diameter of 25 µm. The single crystal LaB₆ <100> orientation, is mounted on the end of a single-piece, stress-free carbon heater rod, and is held in place by a carbon ferrule. The additional guard ring aperture structure controls the exposure of the LaB₆ surface. 暴露的发射极表面直径范围从10µm到250µm，标准直径为25µm。单晶LaB6<100>取向，安装在单片无应力碳加热棒的末端，并由碳套圈固定到位。附加的保护环孔径结构控制LaB6表面的曝光。 The model ES-423GR is available in custom configurations with the LaB₆ crystal cut at a cone angle of 60º or 90º and with a microflat size range from 10 µm to 250 µm. The LaB₆ cathode is available mounted on a standard AEI base, a Kimball Physics CB-104 ceramic base or on a variety of custom bases for particular systems. ES-423GR型号有定制配置，LaB6晶体以60º或90º的锥角切割，微平面尺寸范围从10µm到250µm。LaB6阴极可安装在标准AEI底座、Kimball Physics CB-104陶瓷底座或用于特定系统的各种定制底座上。 Applications:

Scanning Electron Microscopes
Transmission Electron Microscopes
Electron Lithography Systems
Electron Accelerators
X-ray Sources
Custom Applications应用程序：扫描电子显微镜透射电子显微镜电子光刻系统电子加速器 X射线源自定义应用程序

Features / Options:

Guard Ring Design with optimized emission from the microflat surface
Extended Lifetime
- Thousands of functional hours in clean vacuum
- Guaranteed Against Structural Mounting Failure
Exceptional Stability
- Precision machined carbon mounting
- High over-temperature tolerance
High Brightness / Low Energy Spread
- <100> Oriented Single Crystal
- Best Quality / High Purity Material
- Emission current densities up to 30 A/cm2
- Operating pressure < 10-7 torr
Accurate Microflats
- Superior Optics
- Controlled Source Size
- Standard Diameters Available
- Range of emission surface sizes
- Custom sizes available
On AEI base, compact CB-104 base or request custom mounting

功能/选项：微平面发射优化的防护环设计延长使用寿命数千个工作小时清洁真空保证不受结构影响安装故障卓越的稳定性精密加工碳支座高温耐受性高亮度/低能量扩散 <100>定向单晶最佳质量/高纯度材料发射电流密度高达30 A/cm2 工作压力<10-7托精确的微平台卓越的光学性能受控源大小提供标准直径发射表面尺寸范围提供自定义尺寸在AEI底座上，紧凑型CB-104底座或要求定制安装