Study of Fluctuations in Undulator Radiation in the IOTA Ring at Fermilab
We study turn-by-turn fluctuations in the number of emitted photons in an undulator, installed in the IOTA electron storage ring at Fermilab with an InGaAs PIN photodiode and an integrating circuit. Our study was motivated by the previous experiment *. We propose a theoretical model for the experimental data from * and in our own experiment we attempted to verify the model in an independent and more systematic way. Moreover, these fluctuations are an interesting subject for a study by itself, since they act as a seed for SASE in FELs. We improve the precision of the measurements from * by subtracting the average signal amplitude using a comb filter with a one-turn IOTA delay, and by using a special algorithm for noise subtraction. We obtain a reasonable agreement between our theoretical model and experiment. Along with repeating the experiment from *, which was performed at a constant beam current, we also collect data for fluctuations in undulator light at different beam current values. Lastly, in our experiment we were able to see the transition from Poisson statistics to Super-Poisson statistics for undulator light, whereas in * only the latter statistics was observed.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1576544
- Report Number(s):
- FERMILAB-CONF-19-222-AD-DI; oai:inspirehep.net:1743463
- Resource Relation:
- Conference: 10th International Particle Accelerator Conference, Melbourne, Australia, 05/19-05/24/2019
- Country of Publication:
- United States
- Language:
- English
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Study of Fluctuations in Undulator Radiation in the IOTA Ring at Fermilab
Study of Fluctuations in Undulator Radiation in the IOTA Ring at Fermilab