First Measurements and Results With a Stretched Wire Test Setup

Peters, Franz

关键词: ELECTRON BEAMS;    FREE ELECTRON LASERS;    LIGHT SOURCES;    LINEAR ACCELERATORS;    BEAM MONITORS;    PERFORMANCE;    WIGGLER MAGNETS;    X RADIATION;    WIRES;    POSITIONING;    DESIGN;    PERFORMANCE TESTING XFEL;   

DOI  :  10.2172/1000388
RP-ID  :  SLAC-TN-10-090
PID  :  OSTI ID: 1000388
Others  :  TRN: US1100100

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The LINAC Coherent Light Source [LCLS] is a free electron laser, designed to produce high brilliant X-ray beams using Self Amplified Spontaneous Emission [SASE]. Due to the physics of SASE, the electron beam has to be held very precisely on the same trajectory as the X-ray light beam generated by the undulator magnets. To optimize the SASE output, trajectory deviations between both beams have to be minimized to a few micrometers along the entire undulator section and held stable over the time period between beam-based-alignment processes. Consequently, extremely high position stability of all magnets in the undulator section is required to operate the LCLS successfully. The knowledge of any magnet movement exceeding few micrometers during periods of several weeks is essential for efficient X-ray generation. A well known principle of monitoring transverse component positions along beam lines is the application of stretched wires, associated with suitable wire position sensors and electronics. The particular challenge at LCLS is the required wire system performance in conjunction with the length of the undulator section and the large number of monitors. Verification of system stability and resolution under real conditions is the primary goal of this test setup. A stretched wire test setup has been implemented to gain experience for the final design of a wire system, which will meet the position monitoring requirements in the LCLS undulator section. The report briefly introduces the system's architecture and describes first measurements and results.