CYCLOTRONS2022 - List of Keywords (LLRF)

Paper	Title	Other Keywords	Page
MOPO015	TRIUMF LLRF Control System Upgrade	controls, hardware, cavity, Linux	91
	X.L. Fu, T. Au, K. Fong, Q. Zheng TRIUMF, Vancouver, Canada
	The LLRF system for Transfer line from Drift Tube LINAC(DTL) to Superconducting Linac (SCB) (DSB) was an analog-digital hybrid system running at 35.36MHz. The system controls the amplitude/phase and tuning for a buncher cavity on the beamline. During the 2022 October shutdown, the system is upgraded to a new fully-digital LLRF system. The new digital LLRF system is based on TRIUMF’s universal LLRF hardware with a new firmware. Instead of using a VXI crate, the new system adopts a NIM bin and uses USB communication with the local control PC. The amplitude/phase regulation is implemented in the FPGA firmware, and the tuning loop is implemented in the PC software, but driven by the FPGA. The Debian 11 linux OS is running on ARM CPU, and the new digital LLRF system works as a standard window HID device. The linux OS allows the firmware be updated in-situ using Ethernet communication. The detailed design is described in this paper.
	Poster MOPO015 [6.084 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO015
About •	Received ※ 02 December 2022 — Revised ※ 11 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 19 February 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPO007	Direct Sampling Digital Low-Level RF Control for CIAE BNCT Cyclotron	controls, cyclotron, beam-loading, cavity	311
	X. Mu, J.Y. Wei, Z.G. Yin CIAE, Beijing, People’s Republic of China X.L. Fu TRIUMF, Vancouver, Canada
	Boron Neutron Capture Therapy "BNCT" can be delivered using a high current cyclotron, resulting more compact and environmentally friendly design, yet the difficulties remain in the cyclotron part, particularly in RF systems. The high beam loading challenges the stability of the amplifiers, as well as the control loops. Especially in our case, the wall loss of each cavity is more than the beam-loading power of the CIAE BNCT cyclotron. To address the heavy beam loading coefficient, a higher-performance ADRC control algorithm is evaluated, together with the regular PID control. In the meantime, a direct sampling/synthesizing digital low-level RF control hardware design is put forward to have more flexibility in control implementation. Since this new design adopts Xilinx SOC as the main controller, it is convenient to combine real-time control algorithm with high-level control through Advanced Extensible Interface. In this LLRF design, the amplitude and phase control using PID control is implemented in the PS end, and the tuning control is taking advantage of the ADRC algorithm in the PL end. Using a symmetrical design, together with the buncher control, in total, regulation of three loops are achieved using two control boards. The software/hardware design as well as the commission result will be reported in this paper.
	Poster THPO007 [2.567 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THPO007
About •	Received ※ 29 December 2022 — Revised ※ 21 January 2023 — Accepted ※ 31 January 2023 — Issue date ※ 01 April 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPO015

TRIUMF LLRF Control System Upgrade

controls, hardware, cavity, Linux

91

X.L. Fu, T. Au, K. Fong, Q. Zheng
TRIUMF, Vancouver, Canada

The LLRF system for Transfer line from Drift Tube LINAC(DTL) to Superconducting Linac (SCB) (DSB) was an analog-digital hybrid system running at 35.36MHz. The system controls the amplitude/phase and tuning for a buncher cavity on the beamline. During the 2022 October shutdown, the system is upgraded to a new fully-digital LLRF system. The new digital LLRF system is based on TRIUMF’s universal LLRF hardware with a new firmware. Instead of using a VXI crate, the new system adopts a NIM bin and uses USB communication with the local control PC. The amplitude/phase regulation is implemented in the FPGA firmware, and the tuning loop is implemented in the PC software, but driven by the FPGA. The Debian 11 linux OS is running on ARM CPU, and the new digital LLRF system works as a standard window HID device. The linux OS allows the firmware be updated in-situ using Ethernet communication. The detailed design is described in this paper.

Poster MOPO015 [6.084 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO015

About •

Received ※ 02 December 2022 — Revised ※ 11 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 19 February 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPO007

Direct Sampling Digital Low-Level RF Control for CIAE BNCT Cyclotron

controls, cyclotron, beam-loading, cavity

311

X. Mu, J.Y. Wei, Z.G. Yin
CIAE, Beijing, People’s Republic of China
X.L. Fu
TRIUMF, Vancouver, Canada

Boron Neutron Capture Therapy "BNCT" can be delivered using a high current cyclotron, resulting more compact and environmentally friendly design, yet the difficulties remain in the cyclotron part, particularly in RF systems. The high beam loading challenges the stability of the amplifiers, as well as the control loops. Especially in our case, the wall loss of each cavity is more than the beam-loading power of the CIAE BNCT cyclotron. To address the heavy beam loading coefficient, a higher-performance ADRC control algorithm is evaluated, together with the regular PID control. In the meantime, a direct sampling/synthesizing digital low-level RF control hardware design is put forward to have more flexibility in control implementation. Since this new design adopts Xilinx SOC as the main controller, it is convenient to combine real-time control algorithm with high-level control through Advanced Extensible Interface. In this LLRF design, the amplitude and phase control using PID control is implemented in the PS end, and the tuning control is taking advantage of the ADRC algorithm in the PL end. Using a symmetrical design, together with the buncher control, in total, regulation of three loops are achieved using two control boards. The software/hardware design as well as the commission result will be reported in this paper.

Poster THPO007 [2.567 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THPO007

About •

Received ※ 29 December 2022 — Revised ※ 21 January 2023 — Accepted ※ 31 January 2023 — Issue date ※ 01 April 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)