Cyclotrons2013 - List of Keywords (beam-transport)

Paper	Title	Other Keywords	Page
MO2PB02	High Current Beam Extraction from the 88-Inch Cyclotron at LBNL	cyclotron, ion, extraction, ion-source	19
	D.S. Todd, J.Y. Benitez, K.Y. Franzen, M. Kireeff Covo, C.M. Lyneis, L. Phair, P. Pipersky, M.M. Strohmeier LBNL, Berkeley, California, USA
	The low energy beam transport system and the inflector of the 88-Inch Cyclotron have been improved to provide more intense heavy-ion beams, especially for experiments requiring 48Ca beams. In addition to a new spiral inflector* and increased injection voltage, the injection line beam transport and beam orbit dynamics in the cyclotron have been analyzed, new diagnostics have been developed, and extensive measurements have been performed to improve the transmission efficiency. By coupling diagnostics, such as emittance scanners in the injection line and a radially-adjustable beam viewing scintillator within the cyclotron, with computer simulation we have been able to identify loss mechanisms. The diagnostics used and their findings will be presented. We will discuss the solutions we have employed to address losses, such as changing our approach to tuning VENUS and running the cyclotron's central trim coil asymmetrically. *Ken Yoshiki Franzen, et al. "A center region upgrade of the LBNL 88-Inch Cyclotron", these proceedings
	Slides MO2PB02 [0.824 MB]

TUPPT008	A Profile Analysis Method for High-Intensity DC Beams Using a Thermographic Camera	diagnostics, target, neutron, background	168
	K. Katagiri, S. Hojo, T. Honma, A. Noda, K. Noda NIRS, Chiba-shi, Japan
	A new analysis method for the digital-image processing apparatus has been developed to evaluate profiles of high-intensity DC beams from temperature images of irradiated-thin foils. Numerical calculations were performed to examine the reliability and the performance of the profile analysis method. To simulate the temperature images acquired by a thermographic camera, temperature distributions were numerically calculated for various beam parameters. The noises in the temperature images, which are added by the camera sensor, were also simulated to be taken its effect into account. By using the profile analysis method, the beam profiles were evaluated from the simulated-temperature images, and they were compared with the exact solution of the beam profiles. We found that the profile analysis method is adaptable over a wide beam current range of ~0.1 – 10 μA, even if a general-purpose thermographic camera with rather high noise (NETD ~ 0.3 K, NETD: Noise Equivalent Temperature Difference) is employed.

TU4PB03	Superconducting Beam Transport Channel for a Strong-Focusing Cyclotron	dipole, cyclotron, quadrupole, focusing	278
	K.E. Melconian, S. Assadi, K.C. Damborsky, J.N. Kellams, P.M. McIntyre, N. Pogue, A. Sattarov Texas A&M University, College Station, Texas, USA
	Funding: The Mitchell Family Foundation and Texas ASE Fund A superconducting strong focusing cyclotron is being developed for high current applications. Alternating-gradient focusing is provided by an array of ~ 6T/m superconducting beam transport channels which lie in the sectors along the arced beam trajectory of each orbit of the cyclotron. The ~1T sector dipoles, corrector dipoles, and Panofsky type quadrupoles utilize MgB2 superconductor operating in the range 15-20 K. The quadrupole windings make it possible to produce strong focusing of the transverse phase space throughout acceleration. The trim dipole makes it possible to maintain isochronicity and to open the orbit spacing at injection and extraction. The design, development and prototype progress will be presented.
	Slides TU4PB03 [4.020 MB]

WEPPT003	Beam Optical Simulation in a Proposed Magnetic Einzel Lens	solenoid, ion, 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.

WEPPT006	Design of Achromatic Bends for the High Energy Beam Transport System of HCI at IUAC Delhi	DTL, quadrupole, ion, optics	332
	A. Mandal, D. Kanjilal, S. Kumar, G.O. Rodrigues IUAC, New Delhi, India
	The high energy beam transport system of the High Current Injector (HCI) being currently developed at IUAC will transport beam of maximum energy ~ 1.8 MeV/u with mass to charge ratio (A/q) equal to 6 from drift tube linac (DTL) to the superconducting LINAC in the zero degree beam line of the existing 15UD Pelletron. The whole transport path (~40 m) consists of four 90 degree bends. Since the beams coming from DTL are expected to have an energy spread of 0.5 %, the magnetic bends have to be achromatic. The transport system is designed to meet the restrictions imposed by the existing beam hall and the other space constraints. The first three 90 degree achromats have the configuration of Q1Q2Q3MQ4MQ3Q2Q1 and the fourth one has configuration of Q1Q2MQ3Q4Q4Q3MQ2Q1 where Q stands for magnetic quadrupole and M stands for 45 degree bending magnets. Each achromat has been designed so that its total length is restricted to 7 m to fit into the available space. The maximum dispersion occurs at the middle of Q4. Standard beam dynamics codes like GICOSY* and TRACE 3D** have been used to design the achromats and details of optics will be presented. H. Weick, GICOSY homepage, http://www.linux.gsi.de/~weick/gicosy *K.R. Crandall, TRACE 3-D Documentation, Report LA-11054-MS, Los Alamos, 1987

Paper

Title

Other Keywords

Page

MO2PB02

High Current Beam Extraction from the 88-Inch Cyclotron at LBNL

cyclotron, ion, extraction, ion-source

19

D.S. Todd, J.Y. Benitez, K.Y. Franzen, M. Kireeff Covo, C.M. Lyneis, L. Phair, P. Pipersky, M.M. Strohmeier
LBNL, Berkeley, California, USA

The low energy beam transport system and the inflector of the 88-Inch Cyclotron have been improved to provide more intense heavy-ion beams, especially for experiments requiring 48Ca beams. In addition to a new spiral inflector* and increased injection voltage, the injection line beam transport and beam orbit dynamics in the cyclotron have been analyzed, new diagnostics have been developed, and extensive measurements have been performed to improve the transmission efficiency. By coupling diagnostics, such as emittance scanners in the injection line and a radially-adjustable beam viewing scintillator within the cyclotron, with computer simulation we have been able to identify loss mechanisms. The diagnostics used and their findings will be presented. We will discuss the solutions we have employed to address losses, such as changing our approach to tuning VENUS and running the cyclotron's central trim coil asymmetrically.
*Ken Yoshiki Franzen, et al. "A center region upgrade of the LBNL 88-Inch Cyclotron", these proceedings

Slides MO2PB02 [0.824 MB]

TUPPT008

A Profile Analysis Method for High-Intensity DC Beams Using a Thermographic Camera

diagnostics, target, neutron, background

168

K. Katagiri, S. Hojo, T. Honma, A. Noda, K. Noda
NIRS, Chiba-shi, Japan

A new analysis method for the digital-image processing apparatus has been developed to evaluate profiles of high-intensity DC beams from temperature images of irradiated-thin foils. Numerical calculations were performed to examine the reliability and the performance of the profile analysis method. To simulate the temperature images acquired by a thermographic camera, temperature distributions were numerically calculated for various beam parameters. The noises in the temperature images, which are added by the camera sensor, were also simulated to be taken its effect into account. By using the profile analysis method, the beam profiles were evaluated from the simulated-temperature images, and they were compared with the exact solution of the beam profiles. We found that the profile analysis method is adaptable over a wide beam current range of ~0.1 – 10 μA, even if a general-purpose thermographic camera with rather high noise (NETD ~ 0.3 K, NETD: Noise Equivalent Temperature Difference) is employed.

TU4PB03

Superconducting Beam Transport Channel for a Strong-Focusing Cyclotron

dipole, cyclotron, quadrupole, focusing

278

K.E. Melconian, S. Assadi, K.C. Damborsky, J.N. Kellams, P.M. McIntyre, N. Pogue, A. Sattarov
Texas A&M University, College Station, Texas, USA

Funding: The Mitchell Family Foundation and Texas ASE Fund
A superconducting strong focusing cyclotron is being developed for high current applications. Alternating-gradient focusing is provided by an array of ~ 6T/m superconducting beam transport channels which lie in the sectors along the arced beam trajectory of each orbit of the cyclotron. The ~1T sector dipoles, corrector dipoles, and Panofsky type quadrupoles utilize MgB2 superconductor operating in the range 15-20 K. The quadrupole windings make it possible to produce strong focusing of the transverse phase space throughout acceleration. The trim dipole makes it possible to maintain isochronicity and to open the orbit spacing at injection and extraction. The design, development and prototype progress will be presented.

Slides TU4PB03 [4.020 MB]

WEPPT003

Beam Optical Simulation in a Proposed Magnetic Einzel Lens

solenoid, ion, 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.

WEPPT006

Design of Achromatic Bends for the High Energy Beam Transport System of HCI at IUAC Delhi

DTL, quadrupole, ion, optics

332

A. Mandal, D. Kanjilal, S. Kumar, G.O. Rodrigues
IUAC, New Delhi, India

The high energy beam transport system of the High Current Injector (HCI) being currently developed at IUAC will transport beam of maximum energy ~ 1.8 MeV/u with mass to charge ratio (A/q) equal to 6 from drift tube linac (DTL) to the superconducting LINAC in the zero degree beam line of the existing 15UD Pelletron. The whole transport path (~40 m) consists of four 90 degree bends. Since the beams coming from DTL are expected to have an energy spread of 0.5 %, the magnetic bends have to be achromatic. The transport system is designed to meet the restrictions imposed by the existing beam hall and the other space constraints. The first three 90 degree achromats have the configuration of Q1Q2Q3MQ4MQ3Q2Q1 and the fourth one has configuration of Q1Q2MQ3Q4Q4Q3MQ2Q1 where Q stands for magnetic quadrupole and M stands for 45 degree bending magnets. Each achromat has been designed so that its total length is restricted to 7 m to fit into the available space. The maximum dispersion occurs at the middle of Q4. Standard beam dynamics codes like GICOSY* and TRACE 3D** have been used to design the achromats and details of optics will be presented.
*H. Weick, GICOSY homepage, http://www.linux.gsi.de/~weick/gicosy
**K.R. Crandall, TRACE 3-D Documentation, Report LA-11054-MS, Los Alamos, 1987