Name: Budker Seminar: Jibong Hyun
Start: 2018-01-08T17:00:00-06:00
End: 2018-01-08T18:30:00-06:00
Location: Users Center

Budker Seminar: Jibong Hyun

Monday, 8 January 2018 - 17:00

Monday, 8 January 2018

17:00 Refreshments
Refreshments
17:00 - 17:20
Room: Meeting Room
17:20 "Terahertz and X-ray radiation experiments at FAST" - Jibong Hyun (SOKENDAI/KEK)
"Terahertz and X-ray radiation experiments at FAST"
- Jibong Hyun (SOKENDAI/KEK)
17:20 - 18:30
Room: Meeting Room Our goals are to generate narrow-band Terahertz (THz) waves and high brilliance quasi-monochromatic X-rays using about a 30-40 MeV electron beam. The experiments are planned at the FAST (Fermi Accelerator Science and Technology) facility. The low energy beamline consists mainly of a photocathode, an RF gun, two L-band superconducting accelerating cavities, a chicane and a beam dump. To generate THz waves, we use micro-bunched beams to be produced using a slit-mask installed in the middle of the chicane. Also, the electron beam is decompressed with cavity phases set off-crest for clear longitudinal separation of the micro-bunches. In 2017, we carried out experiments with 30 MeV electron beams and detected signals of the micro-bunching using a skew quadrupole magnet in the chicane and a pyrometer. The details of micro-bunch beam production, the detection of THz radiation and comparison with simulations are discussed. As for X-rays, during a short experimental run in 2016 we tried to create high brightness X-rays using electron channeling in a single diamond crystal. We present the simulated X-ray spectrum including the background bremsstrahlung contribution, and optimization of the relevant electron-beam parameters required to maximize the X-ray brilliance. The average brilliance in our experiment is expected to be about one order of magnitude higher than that in previous experiments.