An instrument design for the accurate determination of the electron beam location in the linac coherant light source undulator.

Conference · Tue Jan 01 04:00:00 EST 2008

OSTI ID:972598

Bailey, J L; Nuhn, H; Morgan, J W; Capatina, D; SLAC,

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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 972598
• Report Number(s): ANL/ASD/CP-59591
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ACCURACY
ALIGNMENT
CARBON FIBERS
DESIGN
DETECTION
ELECTRON BEAMS
ELECTRONS
LIGHT SOURCES
LINEAR ACCELERATORS
MAGNETS
REMOVAL
SPECIFICATIONS
WIGGLER MAGNETS