Abstract
By analyzing the pulse to pulse intensity fluctuations of the radiation emitted by a charge particle in the incoherent part of the spectrum, it is possible to extract information about the spatial distribution of the beam. At the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory, we have developed and successfully tested a simple scheme based on this principle that allows for the absolute measurement of the rms bunch length. A description of the method and the experimental results are presented.
Highlights
Charged particle beams can radiate in many ways, by synchrotron radiation, Cerenkov radiation, transition radiation, etc
At the Advanced Light Source of the Lawrence Berkeley National Laboratory, we have developed and successfully tested a simple scheme based on this principle that allows for the absolute measurement of the rms bunch length
In the case of an ideal coasting beam composed of a large number of particles separated by a longitudinal distance d and moving along a circular trajectory, there is no synchrotron radiation emission apart at those wavelengths where 1⁄4 nd, with n being an integer
Summary
Charged particle beams can radiate in many ways, by synchrotron radiation, Cerenkov radiation, transition radiation, etc. As in the real case, the mutual position of particles in the bunch changes, due for instance to longitudinal dispersion or to path length dependence on transverse position, the modulation changes as well, and the energy radiated in a single pass and its spectrum fluctuate turn by turn In this last case, by measuring the radiation over multiple passages, we would observe that for a sufficiently large num-. At the Lawrence Berkeley National Laboratory (LBNL), we have developed a remarkably simpler new version that does not require complex and expensive instrumentation and that allows for accurate absolute measurements of the rms bunch length In such a scheme the radiation intensity emitted during a single beam passage is measured within a fixed bandwidth Á! The measurement theory is presented and the results are used for explaining the bunch length measurements performed on the ALS beam
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical Review Special Topics - Accelerators and Beams
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
