Cyclotrons2019 - List of Keywords (focusing)

Paper	Title	Other Keywords	Page
MOP014	3D Magnetic Optimization of the New Extraction Channel for the LNS Superconducting Cyclotron	cyclotron, simulation, extraction, acceleration	54
	L. Neri, L. Allegra, L. Calabretta, G. Costa, G. D’Agostino, G. Gallo, D. Rifuggiato, A.D. Russo, G. Torrisi INFN/LNS, Catania, Italy
	The upgrade of the Superconducting Cyclotron operating at INFN-LNS is the main objective of the general upgrade of the LNS facility, consisting in the enhancement of light ion beam intensity. To overcome the present maximum power of 100 W of the beam extracted by electrostatic deflector and achieve a beam power as high as 10 kW, the implementation of the extraction by stripping method has been proposed. Intense ion beams with mass in the range 10 to 40 amu (12C, 18O, 20Ne, 40Ar) in the energy range of interest (15-70 MeV/u) will be delivered to the NUMEN experiment, as well as used for production of in-flight radioactive beams. The present work consists in the optimization of the magnetic channels needed to limit the radial and axial beam envelopes. The design of the magnetic channels has been accomplished by fully three-dimensional magneto-static simulations using Comsol Multiphysics and a custom transport code developed in Matlab along the last year at INFN-LNS. The effect of a magnetic shielding structure in the extraction channel is presented, together with the possibility of producing a magnetic gradient from an asymmetric coil.
	Poster MOP014 [2.968 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP014
About •	paper received ※ 15 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP036	The Magnetic Field Design of Cyclotron at IMP	cyclotron, MMI, cryogenics, extraction	116
	Q.G. Yao, B. Wang, B.M. Wu, W. Wu, L. Yang IMP/CAS, Lanzhou, People’s Republic of China
	A cyclotron magnet is studied at Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS), and the whole system include one main magnet and other magnetic gradient correctors, which is used to accelerate the Kr²⁶⁺ beam. The structure of superconducting coils and room-temperature iron core are adopted for the main magnet. This paper describes the magnetic field design of the cyclotron, and several shimming methods are used to meet the isochronous magnetic field of Kr²⁶⁺ beam, including pole face shimming method and side shimming method. The final optimization results show that the error between simulation and theory value is small. In addition, the magnet structure is also described.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP036
About •	paper received ※ 17 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP036	Optical Design of AVF Weak-Focusing Accelerator	extraction, septum, cyclotron, resonance	242
	C. Hori, T. Aoki, T. Seki Hitachi Ltd., Ibaraki-ken, Japan T. Hae, H. Hiramoto Hitachi Ltd., Hitachi Research Laboratory, Ibaraki-ken, Japan
	A trend in proton beam therapy systems is downsizing their footprints. A larger main magnetic field for the downsizing, however, requires a septum magnet to generate a larger magnetic field for beam extraction. In order to relax the specification of the septum magnet, we consider an azimuthally varying field (AVF) weak-focusing accelerator. The magnetic fields of its hills and valleys can be designed while maintaining the average magnetic fields over the design orbits. Thus, by locating the septum magnet near one of the valleys, the specification is relaxed while keeping the footprint of the accelerator. In this study, we show an optical design of an AVF weak-focusing accelerator with cotangential orbits. The magnetic field in the valleys is smaller than the average magnetic field over the maximum energy orbit by 0.2 T. We evaluate gradient magnetic fields required for beam extraction and find the possibility of variable energy extraction by the static gradient fields.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP036
About •	paper received ※ 13 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEB01	Status of FFAs (Modelling and Existing/planned Machines)	cyclotron, lattice, synchrotron, proton	266
	J.-B. Lagrange, D.J. Kelliher, S. Machida, C.R. Prior, C.T. Rogers STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Since their rebirth two decades ago, great progress has been made in Fixed Field alternating gradient Accelerator (FFA) design, with different optical concepts and technological developments. Several machines have been built, and others are planned. The talk will review the recent progress around the world.
	Slides WEB01 [7.965 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-WEB01
About •	paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THB02	Production of 70 MeV Proton Beam in a Superconducting Cyclotron	cyclotron, proton, extraction, acceleration	294
	V.L. Smirnov, S.B. Vorozhtsov JINR, Dubna, Moscow Region, Russia
	Production of 70 MeV proton beams with help of a cyclotron-type facility is one of highly requested tasks presently. Such beams are used for medical applications including direct tumor irradiation and also for production of medical isotopes. The applications mentioned above dictate corresponding requirements imposed on the beam quality and intensity. For proton therapy treatment it is sufficient to have 300-600 nA output beam current with rather strict tolerance on the transverse beam quality. On the other hand, for the isotope production the major requirement is high enough beam intensity (hundreds µA) with less demanding beam quality. Nowadays, for production of the proton beams in the energy range considered cyclotrons with resistive coil weighting ~200 tons are mostly used. In these cyclotrons two extraction methods - with electrostatic deflector and with stripping foils - can provide somewhat different quality of the output beam. In given report a possibility of using a superconducting cyclotron instead of room-temperature one is considered. To this end, acceleration of various ions was investigated with analysis of the main facility parameters and resulting output beams.
	Slides THB02 [2.733 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-THB02
About •	paper received ※ 06 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOP014

3D Magnetic Optimization of the New Extraction Channel for the LNS Superconducting Cyclotron

cyclotron, simulation, extraction, acceleration

54

L. Neri, L. Allegra, L. Calabretta, G. Costa, G. D’Agostino, G. Gallo, D. Rifuggiato, A.D. Russo, G. Torrisi
INFN/LNS, Catania, Italy

The upgrade of the Superconducting Cyclotron operating at INFN-LNS is the main objective of the general upgrade of the LNS facility, consisting in the enhancement of light ion beam intensity. To overcome the present maximum power of 100 W of the beam extracted by electrostatic deflector and achieve a beam power as high as 10 kW, the implementation of the extraction by stripping method has been proposed. Intense ion beams with mass in the range 10 to 40 amu (12C, 18O, 20Ne, 40Ar) in the energy range of interest (15-70 MeV/u) will be delivered to the NUMEN experiment, as well as used for production of in-flight radioactive beams. The present work consists in the optimization of the magnetic channels needed to limit the radial and axial beam envelopes. The design of the magnetic channels has been accomplished by fully three-dimensional magneto-static simulations using Comsol Multiphysics and a custom transport code developed in Matlab along the last year at INFN-LNS. The effect of a magnetic shielding structure in the extraction channel is presented, together with the possibility of producing a magnetic gradient from an asymmetric coil.

Poster MOP014 [2.968 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP014

About •

paper received ※ 15 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

Export •

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

MOP036

The Magnetic Field Design of Cyclotron at IMP

cyclotron, MMI, cryogenics, extraction

116

Q.G. Yao, B. Wang, B.M. Wu, W. Wu, L. Yang
IMP/CAS, Lanzhou, People’s Republic of China

A cyclotron magnet is studied at Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS), and the whole system include one main magnet and other magnetic gradient correctors, which is used to accelerate the Kr²⁶⁺ beam. The structure of superconducting coils and room-temperature iron core are adopted for the main magnet. This paper describes the magnetic field design of the cyclotron, and several shimming methods are used to meet the isochronous magnetic field of Kr²⁶⁺ beam, including pole face shimming method and side shimming method. The final optimization results show that the error between simulation and theory value is small. In addition, the magnet structure is also described.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP036

About •

paper received ※ 17 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

Export •

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

TUP036

Optical Design of AVF Weak-Focusing Accelerator

extraction, septum, cyclotron, resonance

242

C. Hori, T. Aoki, T. Seki
Hitachi Ltd., Ibaraki-ken, Japan
T. Hae, H. Hiramoto
Hitachi Ltd., Hitachi Research Laboratory, Ibaraki-ken, Japan

A trend in proton beam therapy systems is downsizing their footprints. A larger main magnetic field for the downsizing, however, requires a septum magnet to generate a larger magnetic field for beam extraction. In order to relax the specification of the septum magnet, we consider an azimuthally varying field (AVF) weak-focusing accelerator. The magnetic fields of its hills and valleys can be designed while maintaining the average magnetic fields over the design orbits. Thus, by locating the septum magnet near one of the valleys, the specification is relaxed while keeping the footprint of the accelerator. In this study, we show an optical design of an AVF weak-focusing accelerator with cotangential orbits. The magnetic field in the valleys is smaller than the average magnetic field over the maximum energy orbit by 0.2 T. We evaluate gradient magnetic fields required for beam extraction and find the possibility of variable energy extraction by the static gradient fields.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP036

About •

paper received ※ 13 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

Export •

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

WEB01

Status of FFAs (Modelling and Existing/planned Machines)

cyclotron, lattice, synchrotron, proton

266

J.-B. Lagrange, D.J. Kelliher, S. Machida, C.R. Prior, C.T. Rogers
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Since their rebirth two decades ago, great progress has been made in Fixed Field alternating gradient Accelerator (FFA) design, with different optical concepts and technological developments. Several machines have been built, and others are planned. The talk will review the recent progress around the world.

Slides WEB01 [7.965 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-WEB01

About •

paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

Export •

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

THB02

Production of 70 MeV Proton Beam in a Superconducting Cyclotron

cyclotron, proton, extraction, acceleration

294

V.L. Smirnov, S.B. Vorozhtsov
JINR, Dubna, Moscow Region, Russia

Production of 70 MeV proton beams with help of a cyclotron-type facility is one of highly requested tasks presently. Such beams are used for medical applications including direct tumor irradiation and also for production of medical isotopes. The applications mentioned above dictate corresponding requirements imposed on the beam quality and intensity. For proton therapy treatment it is sufficient to have 300-600 nA output beam current with rather strict tolerance on the transverse beam quality. On the other hand, for the isotope production the major requirement is high enough beam intensity (hundreds µA) with less demanding beam quality. Nowadays, for production of the proton beams in the energy range considered cyclotrons with resistive coil weighting ~200 tons are mostly used. In these cyclotrons two extraction methods - with electrostatic deflector and with stripping foils - can provide somewhat different quality of the output beam. In given report a possibility of using a superconducting cyclotron instead of room-temperature one is considered. To this end, acceleration of various ions was investigated with analysis of the main facility parameters and resulting output beams.

Slides THB02 [2.733 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-THB02

About •

paper received ※ 06 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

Export •

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