论文部分内容阅读
本文介绍输出窗情况的实验研究,并选择圆柱形的谐振腔作为研究对象。将微波功率输入腔内,同时量测电场强度和在窗上及金属壁上之热耗散。当超过一定的临界场强时,发现了窗的非线性受热情况。在这种条件下,窗上的功率耗散随着电埸强度的五次方或更高方次而变化。合成的热应力很容易将窗损坏,对原始结构作不同的变化,以便孤立和更可靠地研究受热情况,来作进一步的实验。部份试验是加上轴向磁场后进行的。我们发现有两种不同的受热机理,一个是需要加上磁场,另一个则不必要。但两者都是基于自由电子来进行电场与窗之间能量交换的过程。这些电子与交变场同步地在窗面上跳跃,因此产生了二次电子的倍增效应,或是说超过一定埸强后,产生二次电子累积的过程。当在介质面上存有污层时,临界埸强可大大地降低。当经过适当的表面处理后,可以大大地增大临界埸强。本文所列出的这些效应,并非局限于圆柱形的窗。只要切向高频场强足够大,对于任何处于真空中的介质面均可适用。
This paper introduces the experimental research on the output window condition, and chooses the cylindrical resonator as the research object. The microwave power is input into the cavity while measuring the electric field strength and heat dissipation on the window and on the metal wall. When a certain critical field strength is exceeded, the window is found to be heated non-linearly. Under such conditions, the power dissipation on the window varies with the square of the square root of the electric field or higher. Synthetic thermal stresses can easily damage the window and make various changes to the original structure in order to isolate and more reliably study the heating conditions for further experimentation. Part of the test is carried out after the axial magnetic field. We found that there are two different heating mechanisms, one is the need to add a magnetic field, the other is not necessary. But both are based on free electrons for the energy exchange between the electric field and the window. These electrons jump on the window surface in synchronism with the alternating field, thus generating the multiplication effect of the secondary electrons or the process of generating secondary electrons after exceeding a certain level. When there is contamination in the media surface, the critical strength can be greatly reduced. After appropriate surface treatment, can greatly increase the critical strength. The effects listed here are not limited to cylindrical windows. As long as the tangential high-frequency field strength is large enough, it is suitable for any dielectric surface in vacuum.