Laser seeding of the storage-ring microbunching instability forhigh-power coherent terahertz radiation

Journal Article · Fri May 26 04:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.97.074802· OSTI ID:919506

Byrd, John M; Hao, Zhao; Martin, Michael C; Robin, David S; Sannibale, Fernando; Schoenlein, Robert W; Zholents, Alexander A; Zolotorev, Max S

We report the rst observation of laser seeding of thestorage ring microbunching instability. Above a threshold bunch current,the interaction of the beam and its radiation results in a coherentinstability, observed as a series of stochastic bursts of coherentsynchrotron radiation (CSR) at terahertz frequencies initiated byfluctuations in the beam density. We have observed that this effect canbe seeded by imprinting an initial density modulation on the beam bymeans of laser 'slicing'. In such a situation, most of the bursts of CSRbecome synchronous with the pulses of the modulating laser and theiraverage intensity scales exponentially with the current per bunch. Wepresent detailed experimental observations of the seeding effect and amodel of the phenomenon. This seeding mechanism also creates potentialapplications as a high power source of CSR at terahertzfrequencies.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Basic EnergySciences
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 919506
• Report Number(s): LBNL--60002; BnR: KC0204016
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 97
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
coherent synchrotron radiation microbunchinginstability