Cyclotrons2013 - List of Keywords (solenoid)

Paper	Title	Other Keywords	Page
WEPPT003	Beam Optical Simulation in a Proposed Magnetic Einzel Lens	ion, beam-transport, optics, electron	323
	M.H. Rashid, A. Chakrabarti VECC, Kolkata, India
	Magnetic scalar potential and field distributions along the central axis of a magnetic einzel lens consisting of a pair of axisymmetric iron yoked anti-solenoids have been evaluated using a simple closed form of analytical expressions. The magnetic field distribution is used to track single charged particles as well as ion beam through lens segmentation method. The method facilitates in evaluation of optical properties as well as aberration coefficients of the lens. Application of such doublet solenoid lens in transporting low energy ion beam introduces minimal rotation of the beam as well as least entangling between transverse phase spaces of the beam.

WEPPT004	Feasibility Study of Intense Beam Matching at the Spiral Inflector Using Elliptical Solenoid	emittance, focusing, space-charge, injection	326
	A. Goswami, V.S. Pandit, P. Sing Babu VECC, Kolkata, India
	Simulation results on a spiral inflector for compact cyclotron, indicate that convergent phase ellipses with different orientations in x and y planes and a comparatively smaller width in the y plane gives better beam transmission through the inflector. In order to transform the axisymmetric beam to a non-axisymmetric beam for matching at the entrance of the inflector one needs either an elliptical solenoid or a quadrupole doublet. The injection system of 10MeV-5mA proton cyclotron being developed at VECC consists of a 2.45GHz (80keV) microwave ion source and two solenoids to transport and match the beam at the spiral inflector. Due to space constraint we have planned to use an elliptical solenoid just before the spiral inflector for transverse matching of the beam. In this work the beam optical properties of an elliptical solenoid have been studied, including the effect of space charge. An envelope model based on the canonical description of motion has been developed and utilized to study the feasibility of using an elliptical solenoid for transverse matching of a space charge dominated beam to the acceptance of a spiral inflector.

WEPPT019	Investigation on the Transverse Emittance Growth of Intense Beam during Bunching	bunching, emittance, simulation, space-charge	361
	P. Sing Babu, A. Goswami, V.S. Pandit VECC, Kolkata, India
	Bunchers are widely used in the injection system of cyclotrons to transform dc beam into a bunched beam in a desired phase width. In the case of low beam current, the longitudinal compression of beam has very little effect on the transverse dynamics. However in the case of high current bunching the increase of current in the specified bunch width as the beam advances affects the transverse behavior. A 2D particle-in-cell code has been developed to study the transverse dynamics during beam bunching in the injection system of 10MeV, 5mA compact proton cyclotron. We have used a linear increase of beam current in the specified bunch width from the buncher position to the time focus. In the PIC method this effect is introduced by reweighting the charge and mass of the macroparticles during the transport with longitudinal compression. The evolutions of beam envelope and emittance growth have been estimated for various initial particle distributions. It is observed that the rms beam size is independent of particular beam distribution whereas rms emittance grows with nonuniformity of the distribution and peaks near the time focus.

WEPPT026	Cyclotron Injection Tests of High-Intensity H²⁺ Beam	proton, cyclotron, emittance, injection	372
	F.S. Labrecque, B.F. Milton BCSI, Vancouver, BC, Canada J.R. Alonso, D. Campo, J.M. Conrad, M. Toups MIT, Cambridge, Massachusetts, USA L. Calabretta, L. Celona INFN/LNS, Catania, Italy R. Gutierrez-Martinez, L.A. Winslow UCLA, Los Angeles, USA D. Winklehner NSCL, East Lansing, Michigan, USA
	Funding: Work funded by NSF agency, contract PHY-1148134 The IsoDAR (sterile neutrino) and DAEδALUS (CP-violation in neutrino sector) experiments will use cyclotrons to deliver high intensity (10 mA peak current) proton beams to neutrino-producing targets. To achieve these very high currents, we plan to inject and accelerate molecular H²⁺ ions. To understand high intensity H²⁺ injection into the central region of a compact cyclotron, and to benchmark space-charge dominated simulation studies, central-region tests are being conducted. The first test was completed this summer; a collaboration of MIT, BEST Cyclotrons and INFN-LNS at the BEST shops in Vancouver. The LNS Versatile Ion Source (VIS) was shipped from Catania to Vancouver, and was mounted, along with HV components and first focusing solenoid, on a test bench. In addition to the bench, BEST provided further beam line elements, instrumentation and a test cyclotron magnet for acceleration to no greater than 1 MeV/amu (to avoid any neutron production). Axial injection studies were conducted with a Catania-designed spiral inflector. Experimental configurations, beam characterization measurements, and phase acceptance and buncher efficiency studies will be reported.

Paper

Title

Other Keywords

Page

WEPPT003

Beam Optical Simulation in a Proposed Magnetic Einzel Lens

ion, beam-transport, optics, electron

323

M.H. Rashid, A. Chakrabarti
VECC, Kolkata, India

Magnetic scalar potential and field distributions along the central axis of a magnetic einzel lens consisting of a pair of axisymmetric iron yoked anti-solenoids have been evaluated using a simple closed form of analytical expressions. The magnetic field distribution is used to track single charged particles as well as ion beam through lens segmentation method. The method facilitates in evaluation of optical properties as well as aberration coefficients of the lens. Application of such doublet solenoid lens in transporting low energy ion beam introduces minimal rotation of the beam as well as least entangling between transverse phase spaces of the beam.

WEPPT004

Feasibility Study of Intense Beam Matching at the Spiral Inflector Using Elliptical Solenoid

emittance, focusing, space-charge, injection

326

A. Goswami, V.S. Pandit, P. Sing Babu
VECC, Kolkata, India

Simulation results on a spiral inflector for compact cyclotron, indicate that convergent phase ellipses with different orientations in x and y planes and a comparatively smaller width in the y plane gives better beam transmission through the inflector. In order to transform the axisymmetric beam to a non-axisymmetric beam for matching at the entrance of the inflector one needs either an elliptical solenoid or a quadrupole doublet. The injection system of 10MeV-5mA proton cyclotron being developed at VECC consists of a 2.45GHz (80keV) microwave ion source and two solenoids to transport and match the beam at the spiral inflector. Due to space constraint we have planned to use an elliptical solenoid just before the spiral inflector for transverse matching of the beam. In this work the beam optical properties of an elliptical solenoid have been studied, including the effect of space charge. An envelope model based on the canonical description of motion has been developed and utilized to study the feasibility of using an elliptical solenoid for transverse matching of a space charge dominated beam to the acceptance of a spiral inflector.

WEPPT019

Investigation on the Transverse Emittance Growth of Intense Beam during Bunching

bunching, emittance, simulation, space-charge

361

P. Sing Babu, A. Goswami, V.S. Pandit
VECC, Kolkata, India

Bunchers are widely used in the injection system of cyclotrons to transform dc beam into a bunched beam in a desired phase width. In the case of low beam current, the longitudinal compression of beam has very little effect on the transverse dynamics. However in the case of high current bunching the increase of current in the specified bunch width as the beam advances affects the transverse behavior. A 2D particle-in-cell code has been developed to study the transverse dynamics during beam bunching in the injection system of 10MeV, 5mA compact proton cyclotron. We have used a linear increase of beam current in the specified bunch width from the buncher position to the time focus. In the PIC method this effect is introduced by reweighting the charge and mass of the macroparticles during the transport with longitudinal compression. The evolutions of beam envelope and emittance growth have been estimated for various initial particle distributions. It is observed that the rms beam size is independent of particular beam distribution whereas rms emittance grows with nonuniformity of the distribution and peaks near the time focus.

WEPPT026

Cyclotron Injection Tests of High-Intensity H²⁺ Beam

proton, cyclotron, emittance, injection

372

F.S. Labrecque, B.F. Milton
BCSI, Vancouver, BC, Canada
J.R. Alonso, D. Campo, J.M. Conrad, M. Toups
MIT, Cambridge, Massachusetts, USA
L. Calabretta, L. Celona
INFN/LNS, Catania, Italy
R. Gutierrez-Martinez, L.A. Winslow
UCLA, Los Angeles, USA
D. Winklehner
NSCL, East Lansing, Michigan, USA

Funding: Work funded by NSF agency, contract PHY-1148134
The IsoDAR (sterile neutrino) and DAEδALUS (CP-violation in neutrino sector) experiments will use cyclotrons to deliver high intensity (10 mA peak current) proton beams to neutrino-producing targets. To achieve these very high currents, we plan to inject and accelerate molecular H²⁺ ions. To understand high intensity H²⁺ injection into the central region of a compact cyclotron, and to benchmark space-charge dominated simulation studies, central-region tests are being conducted. The first test was completed this summer; a collaboration of MIT, BEST Cyclotrons and INFN-LNS at the BEST shops in Vancouver. The LNS Versatile Ion Source (VIS) was shipped from Catania to Vancouver, and was mounted, along with HV components and first focusing solenoid, on a test bench. In addition to the bench, BEST provided further beam line elements, instrumentation and a test cyclotron magnet for acceleration to no greater than 1 MeV/amu (to avoid any neutron production). Axial injection studies were conducted with a Catania-designed spiral inflector. Experimental configurations, beam characterization measurements, and phase acceptance and buncher efficiency studies will be reported.