Beam Imaging 电子束观察系统 BOS-75-IW 荧光屏在真空测试中的应用

一种真空荧光屏的可靠性分析作者：覃晓琼，师义民，李豪亮... 摘要：基于真空荧光屏(VFD)寿命服从对数正态分布的条件,本文在逐次定数截尾样本下研究了VFD的平均寿命、失效率和可靠度的点估计及其置信下限,并利用Monte-Carlo方法对估计结果的优劣进行了分析比较,验证了结论的正确性和可行性. 关键词：真空荧光屏对数正态分布逐次定数截尾可靠性评估平均寿命置信下限可靠度点估计极大似然估计失效率 Beam Imaging Solutions (BIS) introduces the new 90-degree BOS which allows remote imaging of a beam at 90 degrees to the imaging plane. Like the BOS-18-IW and BOS-40-IW, the new BOS-75-IW can be attached to a linear motion feedthrough and placed into and out of the beam allowing for remote imaging, deep within the vacuum chamber. The imaging is accomplished by mounting a standard BOS MCP/phosphor screen stack onto a metal housing which has a mirror mounted at 90-degrees with respect to the imaging plane. The housing is wedged shaped to minimize the physical size of the imager, and has convenient points for attaching to a linear motion feedthrough. Electrical connections are made by attaching flexible electrically insulated wires to a connection block on the wedge from an electrical feedthrough. In their standard form, the BOS-IW units are available with the MCP/phosphor assembly mounted to wedge shaped housing with electrical connection block. BOS-IW kits are also available, and include the BOS-IW unit with electrical feedthrough, viewport, linear motion feedthrough and camera systems.

Imaging Area:

75mm Diameter

MCP: (Standard)

3.410″ Diam. (BOS-75), 25 micron channel diameter, Detection or Imaging Grade
75mm active area, 32 micron pitch, 8° Bias Angle, 40:1 Aspect Ratio (Standard, BOS-75)
Min. Gain: 1 x 10^4 (single plate, Std.) 1000V > 107 (chevron, OPT-01), 2000V

Phosphor Screen (Standard)

P-43 with aluminum overcoat. P-43 Peak Wavelength: λ= 545 nm.

Construction Materials

Housing: Aluminum (Std.) 304 Stainless is optional
Electrical Connection Block: ULTEM 1000
Mirror: 125mm (W) x 150mm (L) x 3mm (T), 2 waves per inch flatness, B270 Glass, Index=1.523

Power Supply Requirements: