Jefferson Lab, Newport News, Virginia
November 11-13, 2002

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Contamination control is cross-disciplinary activity involving physics, chemistry, mechanics, electromagnetics, and other disciplines. Contamination is not simply good house keeping; it also involves the understanding of how processes and equipment operate as well as how process equipment is designed.

You may register for the Short Course when you submit your workshop registration. If you have already registered for the workshop and wish to ADD the Short Course, please send your request to: sthomas@jlab.org.

This course begins with an introduction on type of contaminants (molecular and particulate) and clean rooms, and today.s concerns. Next particle dynamics: how particles move and how they are attached and released from surfaces is discussed. Particle measurement techniques both inside and outside vacuum environment will be described. Further, molecular and particulate contaminations in vacuum systems will be portrayed.

Liquid cleaning of surfaces will be discussed. In addition, dry cleaning of vacuum chambers and cleaning of various materials will be highlighted. Management of water vapor in vacuum systems: role of water, prevention of the aerosol formation and possible subsequent particulate transport mechanisms will be presented.

1. Introduction What is contamination (molecular? Particulate)? What is a clean room? Today's concerns 2. Particle dynamics Fluid drag Gravitational settling Thermophoresis Electostatics Convection Adhesion 3. Particle measurement techniques Detecting particles in vacuum Ideal detector Sensitivity vs response time Statistics of rarified events 4. Vacuum pump contamination Turbo pump Cryo pump Ion pump

5. Dry cleaning of vacuum chambers Cleaning of Al, Cu, Nb and SS Thermal baking UV simulated desorption Plasma cleaning 6. Liquid cleaning of surfaces Liquid film draining Zeta potential Streaming potential Surfaces: (clean room & chamber walls) Preventing Re-Deposition Surface wiping model 7. Management of water vapor Role of water Formation of aerosols Preventing aerosols Adiabatic compression

content by Ganapati Myneni
maintained by webmaster@jlab.org
updated August 19, 2002