DocumentCode :
2878778
Title :
An instrument design for the accurate determination of the electron beam location in the Linac Coherent Light Source undulator
Author :
Bailey, J.L. ; Morgan, J.W. ; Capatina, D. ; Nuhn, H.
Author_Institution :
Argonne Nat. Lab., Argonne
fYear :
2007
fDate :
25-29 June 2007
Firstpage :
4324
Lastpage :
4326
Abstract :
The linac coherent light source (LCLS), currently under design, requires accurate alignment between the electron beam and each undulator´s magnetic centerline. A beam finder wire (BFW) instrument has been developed to provide beam location information that is used to move the undulators to their appropriate positions. A BFW instrument is mounted at each of the 33 magnets in the undulator section. Beam detection is achieved by electrons impacting two carbon fiber wires and then sensing the downstream radiation. The wires are mounted vertically and horizontally on a wire card similar to that of a traditional wire scanner instrument. The development of the BFW presents several design challenges due to the need for high accuracy of the wires´ locations and the need for removal of the wires during actual operation of the LCLS (30 microns repeatability is required for the wire locations). In this paper, we present the technical specification, design criteria, mechanical design, and results from prototype tests for the BFW.
Keywords :
electron accelerators; electron beams; linear accelerators; wigglers; wires (electric); beam finder wire instrument; carbon fiber wires; electron beam location; electron impact; instrument design; linac coherent light source; mechanical design; prototype tests; undulator magnetic centerline; wire scanner instrument; Electron beams; Instruments; Light sources; Linear particle accelerator; Magnets; Prototypes; Radiation detectors; Testing; Undulators; Wire;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
Type :
conf
DOI :
10.1109/PAC.2007.4440001
Filename :
4440001
Link To Document :
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