MO3A7
RIKEN SPring-8 Center, Hyogo, Japan
KEK, Ibaraki, Japan
QST, Tokai, Japan
RIKEN SPring-8 Center, Hyogo, Japan
JASRI, Hyogo, Japan
| Paper | Title | Page |
|---|---|---|
MO3A7 |
Present Status of SACLA and Plans for Future Upgrades | |
|
||
| SACLA has two XFEL beamlines, BL3 and BL2, which are driven by an 8-GeV normal-conducting C-band high-gradient accelerator and provide SASE from 4 keV to 20 keV, and an EUV-FEL beamline BL1, which is driven by an 800-MeV accelerator and provides SASE from 40 eV to 150 eV. To perform the parallel operation of BL3 and BL2 and the top-up injection into the SPring-8 storage ring, the electron gun, accelerating RF, focusing magnets, and switchyard magnets are synchronously controlled for each 60 Hz pulse. In recent years, experiments using special FELs such as reflection-type self-seeded FELs, two-color, double-pulsed FELs, ultra-short pulsed FELs and nano-focusing optics have been conducted at XFEL beamlines. In order to supply XFELs tailored to various experimental conditions, an automatic tuning system of the accelerator using machine learning has been established and is used for daily tuning. In the future, we plan to improve and precisely control the characteristics of the FEL, such as intensity, pulse duration, spectrum, photon energy, and pulse repetition rate. To achieve these goals, we are working on 1) refinement of accelerator models using electron beam monitors and machine learning, 2) development of the electron gun to increase the beam brightness, 3) development of the efficient RF acceleration. For the purpose of 3, we have started to study a new normal-conducting accelerator design, with the goal of increasing the pulse repetition rate while maintaining XFEL performance and power consumption, to be consistent with ¿Green Facility¿ declaration. In this presentation, we introduce the status and future plans for upgrading SACLA. | ||
|
|
Slides MO3A7 [1.161 MB] | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| TU3D4 | Compact HOM-damped RF Cavity for a Next Generation Light Source | 74 |
|
||
| A beam-accelerating RF cavity with a new HOM-damping structure was designed in order to suppress coupled-bunch instabilities in a next generation light source with an ultra-low emittance and supplying X-rays approaching their diffraction limits. The TM020 mode at 509 MHz is selected as a beam-accelerating mode because it has a high Q-value of 60,000 and a shunt impedance sufficient for beam acceleration and brings a compact HOM-damping structure to the cavity differently from massive types of cavities with waveguides or pipes extracting HOM power. Two shallow slots are cut on the cavity inner-wall and materials absorbing RF waves are directly fitted into them. They work as HOM dampers without affecting the RF properties of the beam-accelerating mode. A prototype cavity of OFHC copper was fabricated to demonstrate the HOM-damping and generating an accelerating voltage of 900 kV in the cavity. Since the cavity was successful in operation up to 135 kW, the feasibility of both the high-power operation and the damping structure was proved. Four actual cavities were produced and installed to the new 3-GeV synchrotron radiation facility, NanoTerasu in Japan. | ||
|
|
Slides TU3D4 [8.581 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU3D4 | |
| About • | Received ※ 22 August 2023 — Revised ※ 23 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |