1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Development of photo injector employing Yb fiber laser for stimulus super-radiant THz FEL

TUPM029
3 Jun 2025, 16:00
2h
Exhibiton Hall A _Magpie (TWTC)

Exhibiton Hall A _Magpie

TWTC

Poster Presentation MC2.A08 Linear Accelerators Tuesday Poster Session

Speaker

Hiroyuki Hama (Tohoku University)

Description

THz wave is wonderful prove for materials. Additionally new nonlinear phenomena are expected in spintronic devices if the peak electromagnetic field is greatly higher than 10 MV/cm (3.3 T/cm). Although coherent transition radiation from short bunches is intense, it is very difficult to exceed 10 MV/cm. However we found a possibility of which oscillator FEL reaches ~100 MV/cm employing a pre-bunched configuration.* On a test accelerator (t-ACTS), we are going to introduce a photo-cathode to increase the bunch charge and synchronize with round-trip frequency of an FEL optical resonator. Currently t-ACTS supplies a bunch-charge of 5 pC, whereas the goal is to increase it more than 50 pC for the pre-bunched FEL. Since the intensity of coherent radiation is basically proportional to the square of the charge per bunch, increase of the bunch charge is much effective. The laser system includes a Yb fiber laser oscillator (wavelength: 1047 nm), a multi-pass amplifier, and a fourth harmonic generation (262 nm). A target synchronization accuracy is within 1 deg at 2856 MHz. The assembly of the oscillator has almost completed, and a work for synchronization with RF is on the way.

Funding Agency

JSPS KAKENHI Grant Number 23K17306

Footnotes

*H. Hama et al., “Intense coherent terahertz generation from accelerator-based sources”, Nuclear Instruments and Methods in Physics Research A, 2011, pp. S57-S61

Region represented Asia
Paper preparation format Word

Author

Hiroyuki Hama (Tohoku University)

Co-authors

Anjali Kavar (Tohoku University) Fujio Hinode (Tohoku University) Hiroki Yamada (Tohoku University) Ikurou Nagasawa (Tohoku University) Kazuyuki Sakaue (The University of Tokyo) Ken Takahashi (Tohoku University) Ken-ichi Nanbu (Tohoku University) Kodai Kudo (Tohoku University) Kotaro Shibata (Tohoku University) Pitchayapak Kitisri (Tohoku University) Shigeru Kashiwagi (Research Center for Accelerator and Radioisotope Science) Toshiya Muto (Tohoku University)

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