Determination of longitudinal bunch profile using spectral fluctuations of incoherent radiation

Conference · Wed Jul 05 00:00:00 EDT 2000

OSTI ID:759054

Sajaev, V

Single-shot spectrum measurements of the radiation emitted by an electron bunch provide a novel way to characterize the bunch shape. Shot noise fluctuations in the longitudinal beam density result in radiation with a spectrum that consists of spikes with width inversely proportional to the bunch length. The variance of the Fourier transform of the spectrum is proportional to the convolution function of the beam current averaged over many bunches. After the convolution function is found, the phase retrieval technique can be applied to recover the bunch shape. This technique has been used to analyze the shape of the 4-ps-long bunches at the Low-Energy Undulator Test Line at the Advanced Photon Source.

• Research Organization: Argonne National Lab., IL (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 759054
• Report Number(s): ANL/ASD/CP-100935; TRN: US0004469
• Resource Relation: Conference: 7th European Particle Accelerator Conference (EPAC '2000), Vienna (AT), 06/26/2000--06/30/2000; Other Information: PBD: 5 Jul 2000
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ADVANCED PHOTON SOURCE
BEAM CURRENTS
ELECTRON BEAMS
FLUCTUATIONS
NOISE
WIGGLER MAGNETS
BEAM BUNCHING
BEAM SHAPING