SAP2023 - Table of Session: MOCYA (Contributed oral)

Paper	Title	Page
MOCYA01	Study of the Key Physics Problems in 10mA-class High Current Cyclotron	9
	T.J. Bian, S. An, F.P. Guan, L.Y. Ji, S.M. Wei CIAE, Beijing, People’s Republic of China
	Funding: National Natural Science Foundation of China (Grant No. 12105370) and the Scientific Research Program for Young Talent Elite Project of China National Nuclear Corporation (Grant No. FY212406000404). Proton beam with an average current of 10mA has many important applications in particle physics towards the intensity frontier, as well as in the advanced energy and material science. At present, superconducting linac is the mainstream of high current accelerator. As cyclotron has advantages of continuous beam structure, high beam/grid efficiency(60%~65% can be expected in superconducting ring cyclotron) and lower cost, cyclotron is also a potential candidate for future accelerator scheme with beam current of 10mA-class. Firstly, we will discuss the application prospect and motivation of 10mA-class high power cyclotron(10mA-HPC). Secondly, the key physics problems of 10mA-HPC are summarized, which includes strong space charge problems in low energy region, integer resonance crossing problems in high energy region and beam losses problems in extraction region. Thirdly, possible solutions for key physics problems and preliminary design of 10mA-HPC are proposed.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOCYA01
About •	Received ※ 30 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 30 May 2024
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MOCYA02	Self-consistent Simulation of Beam-Beam Interaction and Transverse Impedance in EicC
	L. Wang, J.C. Yang IMP/CAS, Lanzhou, People’s Republic of China L. Wang University of Chinese Academy of Sciences, Beijing, People’s Republic of China
	Recently, the interplay between beam-beam interaction and impedance has gradually come to the forefront as an essential factor that may limit collider performance. Self-consistent studies have shown that the combined effects could excite new coherent instabilities below the respective instability thresholds. In symmetric machines, such instability is triggered by the mode coupling between the beam-beam modes and the longitudinal sidebands. For electron-ion colliders, i.e., the EicC project, both the beam and machine parameters are remarkably asymmetric. Preliminary studies have shown that in EicC, the coupling between the beam-beam interaction and the impedance could also give rise to instabilities. The simulation results correlate this instability to the hourglass effect, but related studies are still in progress. In addition, how to overcome the strong hourglass effect is a key accelerator physics problem to boost the luminosity of mid-energy colliders, as well as a potential approach that can suppress the above instability. So far, this is an open subject, and relevant studies are still blank. This report will give some preliminary results for the above two questions.
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Study of the Key Physics Problems in 10mA-class High Current Cyclotron

9

T.J. Bian, S. An, F.P. Guan, L.Y. Ji, S.M. Wei
CIAE, Beijing, People’s Republic of China

Funding: National Natural Science Foundation of China (Grant No. 12105370) and the Scientific Research Program for Young Talent Elite Project of China National Nuclear Corporation (Grant No. FY212406000404).
Proton beam with an average current of 10mA has many important applications in particle physics towards the intensity frontier, as well as in the advanced energy and material science. At present, superconducting linac is the mainstream of high current accelerator. As cyclotron has advantages of continuous beam structure, high beam/grid efficiency(60%~65% can be expected in superconducting ring cyclotron) and lower cost, cyclotron is also a potential candidate for future accelerator scheme with beam current of 10mA-class. Firstly, we will discuss the application prospect and motivation of 10mA-class high power cyclotron(10mA-HPC). Secondly, the key physics problems of 10mA-HPC are summarized, which includes strong space charge problems in low energy region, integer resonance crossing problems in high energy region and beam losses problems in extraction region. Thirdly, possible solutions for key physics problems and preliminary design of 10mA-HPC are proposed.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOCYA01

About •

Received ※ 30 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 30 May 2024

Cite •

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

MOCYA02

Self-consistent Simulation of Beam-Beam Interaction and Transverse Impedance in EicC

L. Wang, J.C. Yang
IMP/CAS, Lanzhou, People’s Republic of China
L. Wang
University of Chinese Academy of Sciences, Beijing, People’s Republic of China

Recently, the interplay between beam-beam interaction and impedance has gradually come to the forefront as an essential factor that may limit collider performance. Self-consistent studies have shown that the combined effects could excite new coherent instabilities below the respective instability thresholds. In symmetric machines, such instability is triggered by the mode coupling between the beam-beam modes and the longitudinal sidebands. For electron-ion colliders, i.e., the EicC project, both the beam and machine parameters are remarkably asymmetric. Preliminary studies have shown that in EicC, the coupling between the beam-beam interaction and the impedance could also give rise to instabilities. The simulation results correlate this instability to the hourglass effect, but related studies are still in progress. In addition, how to overcome the strong hourglass effect is a key accelerator physics problem to boost the luminosity of mid-energy colliders, as well as a potential approach that can suppress the above instability. So far, this is an open subject, and relevant studies are still blank. This report will give some preliminary results for the above two questions.

Cite •

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