Download Capture Pumping Technology by K. Welch PDF

By K. Welch

ISBN-10: 0444508821

ISBN-13: 9780444508829

This can be a functional textbook written to be used by means of engineers, scientists and technicians. it's not meant to be a rigorous clinical therapy of the subject matter, as this may fill numerous volumes. relatively, it introduces the reader to the basics of the subject matter, and gives adequate references for an in-depth learn of the topic by way of the technologist. the writer has a life-time educating credential within the California group university process. additionally, he has taught technical classes with the yank Vacuum Society for roughly 35 years. scholars attending lots of those sessions have backgrounds various from high-school graduates to Ph.D.s in technical disciplines. this is often a really tricky category profile to coach. This e-book nonetheless endeavors to arrive this similar viewers. uncomplicated algebra is needed to grasp lots of the fabric. yet, the calculus is utilized in derivation of a few of the equations. the writer dangers use of the 1st individual I , rather than the writer , and you rather than the reader . either are regarded as in terrible style while writing for book within the clinical neighborhood. in spite of the fact that, I am scripting this ebook for you as the topic is intriguing, and that i take pleasure in educating you, possibly, anything new. The publication is written extra within the vein of a one-on-one dialogue with you, instead of the writer lecturing to the reader. There are anecdotes, and examples of a few disasters and successes i've got had during the last forty-five years in vacuum comparable actions, i will attempt to not understate both. finally, there are a couple of equations which if memorised can help you as a vacuum technician. There are under a dozen equations and part that many ideas of thumb to memorize, with a purpose to be drawn on time an back in designing, working and trouble-shooting any vacuum approach.

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Extra resources for Capture Pumping Technology

Sample text

This can become a serious problem in some applications. ('i4) The material has to be sublimed at a fairly slow rate, say one A/see, so that it will settle in and become a well ordered structure. A molecule has dimensions of the order of 2-3 A. If the material being sublimed is chemically active with the gas in the system, and the pressure is 10-6 Torr, this implies that for every molecule sublimed, a chemically active gas molecule arrives on the surface and has an opportunity to form an undesirable chemical compound.

Because of this problem of possible gas contamination of a deposited film, MBE is typically accomplished at pressures ranging from 10" 1 o to 10-9 Torr. 10 Pumping Speed, a Convenient Abstraction The concept of pumping speed is merely a mathematical abstraction, created by man as a convenient tool to describe the behavior of gas in a vacuum system. Pump speed is defined as a volumetric displacement rate. Note that this definition implies nothing about pressure, mass flow, gas density or anything that has to do with gas molecules.

2. Graphically differentiating the curve, we determine APe~At -10 -5 Torr/100 see; or, 10-7 Torr/sec. 1) and multiplying this value by Vc, we determine that Qc,m = 10-4 Torr-Z/s. - n Note that the same gauge was used to measure both Pc and APe~At. 2), for some unknown gas, may be excluded. We have made the assumption of a value for the pump speed, have tested the assumption, and therein reached a contradiction. Therefore, the original assumption was incorrect, and the pump is for some reason not delivering the anticipated speeds to the chamber.

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