Seminars Archive

Development of Diagnostic and Vacuum Components For the Linac Coherent Light Source Undulator System

Abstract
The Linac Coherent Light Source (LCLS) will be the world\'s first x-ray free electron laser when it becomes operational in 2009. The LCLS is a US-DOE-funded project that is currently in the detailed project engineering phase with many sections already fabricated and installed. Pulses of x-ray laser light from LCLS will be many orders of magnitude brighter and several orders of magnitude shorter than what can be produced by any other x-ray source available now or in the near future. These characteristics will enable frontier new science in areas that include discovering and probing new states of matter, understanding and following chemical reactions and biological processes in real time, imaging chemical and structural properties of materials on the nanoscale, and imaging non-crystalline biological materials at atomic resolution. The LCLS project is funded by the U.S. DOE and is a collaboration of six national laboratories and universities. The portion of the accelerator line that produces x-rays is the Undulators. The 33 Undulator assemblies are the heart of the LCLS with a total length measuring 130 meters long. Within the Undulator are the Diagnostics and Vacuum components that the electron beam, and later the x-ray beam, will travel through. This talk will review the development of key Diagnostic and Vacuum components. The vacuum chamber and diagnostics for locating the position of the electron beam will be presented. The Undulator vacuum chamber has been under development for over 4 years and is on the theshold of production. Technical and fabrication challenges will be covered. The chamber is planned to be fabricated from the austenite stainless steels. The challenge of this design is to construct a chamber with a highly polished internal surface, coated with aluminium, and with very low magnetic permeability. Other significate components are instruments for locating the position of the electron beam. The first is a device called “beam finder wire‿ and it is a simplied design of a scanning wire diagnostic. The other is the RF beam position monitor. This is uses an x-band cavity that measures the position of the electron beam down to the micron level.