Measurements of undulator radiation power noise and comparison with $\text{ab initio}$ calculations

Abstract

Generally, turn-to-turn fluctuations of synchrotron radiation power in a storage ring depend on the 6D phase-space distribution of the electron bunch. This effect is related to the interference of fields radiated by different electrons. Changes in the relative electron positions and velocities inside the bunch result in fluctuations in the total emitted energy per pass in a synchrotron radiation source. This effect has been previously described assuming constant and equal electron velocities before entering the synchrotron radiation source. In this paper, we present a generalized formula for the fluctuations with a non-negligible beam divergence. Further, we corroborate this formula in a dedicated experiment with undulator radiation in the Integrable Optics Test Accelerator (IOTA) storage ring at Fermilab. Lastly, possible applications in beam instrumentation are discussed.

References in corpus (5)

• IOTA (Integrable Optics Test Accelerator): Facility and Experimental Beam Physics Program
• Betatron motion with coupling of horizontal and vertical degrees of freedom
• Transverse beam emittance measurement by undulator radiation power noise
• Statistical properties of undulator radiation in the IOTA storage ring
• Computation and Numerical Simulation of Focused Undulator Radiation for Optical Stochastic Cooling

Cited by in corpus (3)

• Transverse beam emittance measurement by undulator radiation power noise
• Theoretical and Experimental Studies on Steady-state Microbunching
• Quantum state features of the FEL radiation from the occupation number statistics