Cyclotrons2019 - List of Authors (Torrisi, G.)

Paper	Title	Page
MOP014	3D Magnetic Optimization of the New Extraction Channel for the LNS Superconducting Cyclotron	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)

WEA02	The Developments of the RF System Related to the K-800 Superconducting Cyclotron Upgrade	262
	A.C. Caruso, L. Calabretta, G. Costa, G. Gallo, A. Longhitano, D. Rifuggiato, A. Spartà, G. Torrisi, E. Zappalà INFN/LNS, Catania, Italy
	The K-800 superconducting cyclotron has been in operation at Laboratori Nazionali del Sud for almost 25 years. It has been subjected to continuous upgrades and modifications since 1994: the RF couplers have been redesigned, the new dees have been changed from aluminium to copper, as has the new central region from radial to axial injection of the beam, the hybrid configuration solid state - tube of the power amplifiers, the digital LLRF, etc. The next scheduled important upgrade of the Cyclotron mainly consists in a new extraction beam line able to support the increase of the beam current intensity. The accelerated beam will be extracted in two ways: by stripper and by electrostatic deflector and, consequently, one of the most important features of the new upgrade is the new cryostat. Further upgrades and refurbishments of the other main parts of the cyclotron, such as a new liner, the modification of the RF cavities and dees, the refurbishment of HLRF-LLRF, the insertion of the stripper extraction system, to name but a few, are in progress, too. This work focuses on the RF system upgrade.
	Slides WEA02 [10.816 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-WEA02
About •	paper received ※ 15 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)

THD01	Physics and Technology of Compact Plasma Traps	321
	D. Mascali, G. Castro, L. Celona, S. Gammino, O. Leonardi, M. Mazzaglia, E. Naselli, G. Torrisi INFN/LNS, Catania, Italy E. Naselli Catania University, Catania, Italy
	ECR Ion Sources are deemed to be among the most performing ion sources feeding particle accelerators, cyclotrons in particular. Improvements of their performances strictly depend on the knowledge of plasma physics in compact magnetic traps. The paper will comment on the results obtained by the INFN-LNS team and international collaborators by means of a multi-diagnostics setup able to monitor the evolution in space and time of several plasma parameters, simultaneously with beam extraction and analysis in the LEBT, in single vs. double frequency operations, including the RF power and magnetic field scalings, and exploring regimes dominated by plasma turbulence. The results are relevant for the operations of existing ion sources and for the design of new ones. Compact magnetic traps fashioned in a similar way of ECRISs can be considered as an experimental environment by itself: we are exploring this opportunity relying to the in-plasma measurements of radionuclides lifetimes (in particular, beta-decaying elements): CosmoChronometers or nuclei involved in the s-process nucleosynthesis are among the case studies, opening new perspectives in the nuclear astrophysics field.
	Slides THD01 [17.662 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-THD01
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)

FRB03	3D Radio Frequency Simulation of the INFN-LNS Superconducting Cyclotron	361
	G. Torrisi, L. Allegra, L. Calabretta, A.C. Caruso, G. Costa, G. Gallo, A. Longhitano, L. Neri, D. Rifuggiato INFN/LNS, Catania, Italy
	An upgrade plan of the Superconducting Cyclotron operating at INFN-LNS is ongoing. In this paper, a 3D numerical model of the Cyclotron radio frequency cavity is presented. Simulations include the coaxial sliding shorts, liner vacuum chamber, coupler, trimming capacitor and the Dees structures. CST microwave studio software has been used for numerical computation. RF simulations are mandatory also in order to analyze the field in the beam region and evaluate the impact of different Dees geometry and eventual field asymmetries. Moreover, 3D COMSOL Multiphysics simulations have been carried out in order to couple the electromagnetic field solution to a custom beam-dynamics code developed in Matlab as a future plan. Time evolution of accelerated beam and electromagnetic field make also possible to verify the magnetic field synchronization. Experimental validation of the developed model will be also presented.
	Slides FRB03 [19.931 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRB03
About •	paper received ※ 15 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

Page

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

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)

WEA02

The Developments of the RF System Related to the K-800 Superconducting Cyclotron Upgrade

262

A.C. Caruso, L. Calabretta, G. Costa, G. Gallo, A. Longhitano, D. Rifuggiato, A. Spartà, G. Torrisi, E. Zappalà
INFN/LNS, Catania, Italy

The K-800 superconducting cyclotron has been in operation at Laboratori Nazionali del Sud for almost 25 years. It has been subjected to continuous upgrades and modifications since 1994: the RF couplers have been redesigned, the new dees have been changed from aluminium to copper, as has the new central region from radial to axial injection of the beam, the hybrid configuration solid state - tube of the power amplifiers, the digital LLRF, etc. The next scheduled important upgrade of the Cyclotron mainly consists in a new extraction beam line able to support the increase of the beam current intensity. The accelerated beam will be extracted in two ways: by stripper and by electrostatic deflector and, consequently, one of the most important features of the new upgrade is the new cryostat. Further upgrades and refurbishments of the other main parts of the cyclotron, such as a new liner, the modification of the RF cavities and dees, the refurbishment of HLRF-LLRF, the insertion of the stripper extraction system, to name but a few, are in progress, too. This work focuses on the RF system upgrade.

Slides WEA02 [10.816 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-WEA02

About •

paper received ※ 15 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)

THD01

Physics and Technology of Compact Plasma Traps

321

D. Mascali, G. Castro, L. Celona, S. Gammino, O. Leonardi, M. Mazzaglia, E. Naselli, G. Torrisi
INFN/LNS, Catania, Italy
E. Naselli
Catania University, Catania, Italy

ECR Ion Sources are deemed to be among the most performing ion sources feeding particle accelerators, cyclotrons in particular. Improvements of their performances strictly depend on the knowledge of plasma physics in compact magnetic traps. The paper will comment on the results obtained by the INFN-LNS team and international collaborators by means of a multi-diagnostics setup able to monitor the evolution in space and time of several plasma parameters, simultaneously with beam extraction and analysis in the LEBT, in single vs. double frequency operations, including the RF power and magnetic field scalings, and exploring regimes dominated by plasma turbulence. The results are relevant for the operations of existing ion sources and for the design of new ones. Compact magnetic traps fashioned in a similar way of ECRISs can be considered as an experimental environment by itself: we are exploring this opportunity relying to the in-plasma measurements of radionuclides lifetimes (in particular, beta-decaying elements): CosmoChronometers or nuclei involved in the s-process nucleosynthesis are among the case studies, opening new perspectives in the nuclear astrophysics field.

Slides THD01 [17.662 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-THD01

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)

FRB03

3D Radio Frequency Simulation of the INFN-LNS Superconducting Cyclotron

361

G. Torrisi, L. Allegra, L. Calabretta, A.C. Caruso, G. Costa, G. Gallo, A. Longhitano, L. Neri, D. Rifuggiato
INFN/LNS, Catania, Italy

An upgrade plan of the Superconducting Cyclotron operating at INFN-LNS is ongoing. In this paper, a 3D numerical model of the Cyclotron radio frequency cavity is presented. Simulations include the coaxial sliding shorts, liner vacuum chamber, coupler, trimming capacitor and the Dees structures. CST microwave studio software has been used for numerical computation. RF simulations are mandatory also in order to analyze the field in the beam region and evaluate the impact of different Dees geometry and eventual field asymmetries. Moreover, 3D COMSOL Multiphysics simulations have been carried out in order to couple the electromagnetic field solution to a custom beam-dynamics code developed in Matlab as a future plan. Time evolution of accelerated beam and electromagnetic field make also possible to verify the magnetic field synchronization. Experimental validation of the developed model will be also presented.

Slides FRB03 [19.931 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRB03

About •

paper received ※ 15 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)