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.

• 75mm Diameter

• 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

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

• 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

• 0 – + 1000V, 1mA single MCP (Standard)
• 0 – + 2000V, 1mA dual MCP (OPT-01)
• 0 – + 5000V, 1 mA Phosphor Screen

• 1 eV to over 50 keV

• < 10 μA (with optional beam attenuation grids)

• 1 x 10-6 Torr or better required to operate MCP
• UHV compatible, maximum bakeout temperature 300 C