IPAC2016 - Classification: 04 Hadron Accelerators / T01 Proton and Ion Sources

Paper	Title	Page
TUPMR013	Heat Transfer Study of PIG Ion Source for 10 MeV Cyclotron	1256
	F. Zakerhosseini, H. Afarideh, S. Sabounchi AUT, Tehran, Iran J.-S. Chai, M. Ghergherehchi SKKU, Suwon, Republic of Korea
	A PIG Ion source provides H-ions for the 10 MeV cyclotron, which is designed and being manufactured by Amirkabir university of technology. Plasma created in the anode contains the desired ions. Discharge for producing plasma consists of the both ion current from plasma towards the cathode and the secondary electron current from the cathode to the plasma. Secondary electron emission is the result of ion collision on the surface of the cathode. Heat generated by these collisions is considerably high, so a cooling system for ion source is crucial. In this paper heat transfer study of the ion source, temperature distribution and deformation of different parts simulated using ANSYS CFX. Also the thermionic emission of the electrons from cathode in the calculated temperatures by ANSYS simulated Using CST STUDIO. Results showed the maximum temperature of the cathodes is 1992 K, which is far away from the cathode melting point. The thermionic current in 1992 K of cathode simulated and the results showed an electron current of 0.00706 A at 500 V which is negligible in comparison to the discharge current of 1 A. Maximum deformation were about 0.2 mm in cathode edges.
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TUPMR029	Advanced EBIS Charge Breeder for Rare Isotope Science Project	1304
	S.A. Kondrashev, J.-W. Kim, Y.H. Park IBS, Daejeon, Republic of Korea H.J. Son Handong Global University, Pohang, Republic of Korea
	Rare Isotope Science Project (RISP) is under development in Korea to provide wide variety of intense rare isotope beams for nuclear physics experiments and applied science using both Isotope Separation On-Line (ISOL) and In-Flight Fragmentation (IF) techniques. Electron Beam Ion Source (EBIS) charge breeder is a key element to efficiently accelerate rare isotope ion beams produced by ISOL method. These beams will be charge-bred by an EBIS charge breeder to a charge-to-mass ratio (q/A) ≥ - and accelerated by linac post-accelerator to energies of 18.5 MeV/u. Utilization of 3 A electron beam and 6 T superconducting solenoid with wide (8) warm bore diameter will allow high efficient and fast charge breeding of rare isotope beams with exceptional degree of purity. The main features of RISP EBIS charge breeder design and current status of the project will be presented and discussed.
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TUPMR030	Progress on RFQ Fabrication for RISP Accelerator	1308
	B.-S. Park, B.H. Choi, I.S. Hong IBS, Daejeon, Republic of Korea
	The 81.25MHz Radio Frequency Quadrupole(RFQ), which was designed to accelerate various ion beams from the energy of 10 keV/u to 500 keV/u, is under development for the Rare Isotope Science Project(RISP). The 5 meter long RFQ consists of 9 sections and the total weight is roughly 16 tons. Each sections of RFQ aligned and installed by using a laser tracker on a supporter system. In this paper, the fabrication status of the RISP RFQ and the scheme of installation were described in detail. This work was supported by the RISP of IBS funded by the Ministry of Science, ICT and Future Planning(MSIP) and the National Research Foundation(NRF) of Korea(2013M7A1A1075764).
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TUPMR031	Implementation and Preliminary Test of Electron Beam Ion Sources at KOMAC	1311
	S. Lee, Y.-S. Cho, H.S. Kim, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science, ICT and Future Planning. Electron beam ion source (EBIS) has been one of widely used table-top devices for the production of highly charged ions by electron impact ionization. An EBIS employs a magnetically compressed, high energy and density electron beam to sequentially ionize atoms or ions with a low charge state. At KOMAC, we have a compact room-temperature operated EBIS. It is additionally constructed with a magnetic mass spectrometer and a Faraday Cup to measure charge spectra. Using this measurement setup, preliminary tests are performed to find suitable operational potentials in the EBIS for a stable production of highly charge ions. In future, we aim to build an EBIS based pre-injector with a radio frequency quadrupole. It has advantages of having a simple operation and a large number of ion species. For this, we intend to improve and modify the current EBIS design to incorporate with existing setups at KOMAC. M. A. Levin et al., Phys. Scr. T22, 157-163 (1988) ** J. Alessi et al., EBIS Pre-Injector Project Conceptual Design Report, Brookhaven National Laboratory (2005)
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TUPMR032	Initial Commissioning of the Rutherford Appleton Laboratory (RAL) Scaled Negative Penning Ion Source	1314
	D.C. Faircloth, S.R. Lawrie, T. Rutter, M. Whitehead, T. Wood STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	A new high duty factor, scaled Penning surface plasma source is being developed at RAL. This paper provides initial commissioning results. A stable high-current (up to 100 A) pulsed discharge is obtained, but the anode overheats, caused by poor thermal contact at elevated temperatures. The overheating anode yields a noisy discharge, with low output current, and makes high duty factor operation impossible. The performance of a thermal interface material for aperture plate (plasma electrode) cooling is detailed. An update on the cathode heaters is provided. The anode to source-body fit is analysed at different temperatures for different combinations of mechanical tolerances. This offers insights when compared to ISIS operational sources. A new anode with modified tolerance dimensions for improved fit is being manufactured and will be tested in June 2016.
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TUPMR033	Low Emittance Growth in a LEBT with Un-neutralized Section	1317
	L.R. Prost, J.-P. Carneiro, A.V. Shemyakin Fermilab, Batavia, Illinois, USA
	Funding: Operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the United States Department of Energy In a Low Energy Beam Transport line (LEBT), the emittance growth due to the beam's own space charge is typically suppressed by way of neutralization from either electrons or ions, which originate from ionization of the background gas. In cases where the beam is chopped, the neutralization pattern changes throughout the beginning of the pulse, causing the Twiss parameters to differ significantly from their steady state values, which, in turn, may result in beam losses downstream. For a modest beam perveance, there is an alternative solution, in which the beam is kept un-neutralized in the portion of the LEBT that contains the chopper. The emittance can be nearly preserved if the transition to the un-neutralized section occurs where the beam exhibits low transverse tails. This report discusses the experimental realization of such a scheme at Fermilab's PXIE, where low beam emittance dilution was demonstrated
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TUPMR034	Development and Tests of Beam Test Facility with New Spare RFQ for Spallation Neutron Source	1320
	Y.W. Kang, A.V. Aleksandrov, M.S. Champion, M.T. Crofford, J. Moss, R.T. Roseberry, J.P. Schubert, M.P. Stockli, C.M. Stone, R.F. Welton, D.C. Williams, A.P. Zhukov ORNL, Oak Ridge, Tennessee, USA B. Han, S.W. Lee, M.E. Middendorf, J. Price, R.B. Saethre ORNL RAD, Oak Ridge, Tennessee, USA
	Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE. The Beam Test Facility (BTF) has been constructed to validate the performance of the new RFQ, to study ion source improvements, and to support neutron moderator development and six-dimensional phase space measure-ments for SNS. The BTF includes an H⁻ ion source, Ra-dio-Frequency Quadrupole (RFQ), and Medium Energy Beam Transport (MEBT) beam diagnostics systems. A spare RFQ was built and fully RF tested in the BTF and will be installed in the SNS linac in the future. The test stand is ready to run with the H⁻ ion beam through the new RFQ to fully validate the RFQ performance. The RFQ was designed to have the beam characteristics iden-tical to the existing RFQ with improved operational relia-bility and stability. The H⁻ RF plasma ion source system includes new high power RF components for improved front-end system performance.
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Paper

Title

Page

Heat Transfer Study of PIG Ion Source for 10 MeV Cyclotron

1256

F. Zakerhosseini, H. Afarideh, S. Sabounchi
AUT, Tehran, Iran
J.-S. Chai, M. Ghergherehchi
SKKU, Suwon, Republic of Korea

A PIG Ion source provides H-ions for the 10 MeV cyclotron, which is designed and being manufactured by Amirkabir university of technology. Plasma created in the anode contains the desired ions. Discharge for producing plasma consists of the both ion current from plasma towards the cathode and the secondary electron current from the cathode to the plasma. Secondary electron emission is the result of ion collision on the surface of the cathode. Heat generated by these collisions is considerably high, so a cooling system for ion source is crucial. In this paper heat transfer study of the ion source, temperature distribution and deformation of different parts simulated using ANSYS CFX. Also the thermionic emission of the electrons from cathode in the calculated temperatures by ANSYS simulated Using CST STUDIO. Results showed the maximum temperature of the cathodes is 1992 K, which is far away from the cathode melting point. The thermionic current in 1992 K of cathode simulated and the results showed an electron current of 0.00706 A at 500 V which is negligible in comparison to the discharge current of 1 A. Maximum deformation were about 0.2 mm in cathode edges.

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TUPMR029

Advanced EBIS Charge Breeder for Rare Isotope Science Project

1304

S.A. Kondrashev, J.-W. Kim, Y.H. Park
IBS, Daejeon, Republic of Korea
H.J. Son
Handong Global University, Pohang, Republic of Korea

Rare Isotope Science Project (RISP) is under development in Korea to provide wide variety of intense rare isotope beams for nuclear physics experiments and applied science using both Isotope Separation On-Line (ISOL) and In-Flight Fragmentation (IF) techniques. Electron Beam Ion Source (EBIS) charge breeder is a key element to efficiently accelerate rare isotope ion beams produced by ISOL method. These beams will be charge-bred by an EBIS charge breeder to a charge-to-mass ratio (q/A) ≥ - and accelerated by linac post-accelerator to energies of 18.5 MeV/u. Utilization of 3 A electron beam and 6 T superconducting solenoid with wide (8) warm bore diameter will allow high efficient and fast charge breeding of rare isotope beams with exceptional degree of purity. The main features of RISP EBIS charge breeder design and current status of the project will be presented and discussed.

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TUPMR030

Progress on RFQ Fabrication for RISP Accelerator

1308

B.-S. Park, B.H. Choi, I.S. Hong
IBS, Daejeon, Republic of Korea

The 81.25MHz Radio Frequency Quadrupole(RFQ), which was designed to accelerate various ion beams from the energy of 10 keV/u to 500 keV/u, is under development for the Rare Isotope Science Project(RISP). The 5 meter long RFQ consists of 9 sections and the total weight is roughly 16 tons. Each sections of RFQ aligned and installed by using a laser tracker on a supporter system. In this paper, the fabrication status of the RISP RFQ and the scheme of installation were described in detail.
This work was supported by the RISP of IBS funded by the Ministry of Science, ICT and Future Planning(MSIP) and the National Research Foundation(NRF) of Korea(2013M7A1A1075764).

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TUPMR031

Implementation and Preliminary Test of Electron Beam Ion Sources at KOMAC

1311

S. Lee, Y.-S. Cho, H.S. Kim, H.-J. Kwon
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science, ICT and Future Planning.
Electron beam ion source (EBIS) has been one of widely used table-top devices for the production of highly charged ions by electron impact ionization. An EBIS employs a magnetically compressed, high energy and density electron beam to sequentially ionize atoms or ions with a low charge state*. At KOMAC, we have a compact room-temperature operated EBIS. It is additionally constructed with a magnetic mass spectrometer and a Faraday Cup to measure charge spectra. Using this measurement setup, preliminary tests are performed to find suitable operational potentials in the EBIS for a stable production of highly charge ions. In future, we aim to build an EBIS based pre-injector with a radio frequency quadrupole. It has advantages of having a simple operation and a large number of ion species**. For this, we intend to improve and modify the current EBIS design to incorporate with existing setups at KOMAC.
* M. A. Levin et al., Phys. Scr. T22, 157-163 (1988)
** J. Alessi et al., EBIS Pre-Injector Project Conceptual Design Report, Brookhaven National Laboratory (2005)

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TUPMR032

Initial Commissioning of the Rutherford Appleton Laboratory (RAL) Scaled Negative Penning Ion Source

1314

D.C. Faircloth, S.R. Lawrie, T. Rutter, M. Whitehead, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

A new high duty factor, scaled Penning surface plasma source is being developed at RAL. This paper provides initial commissioning results. A stable high-current (up to 100 A) pulsed discharge is obtained, but the anode overheats, caused by poor thermal contact at elevated temperatures. The overheating anode yields a noisy discharge, with low output current, and makes high duty factor operation impossible. The performance of a thermal interface material for aperture plate (plasma electrode) cooling is detailed. An update on the cathode heaters is provided. The anode to source-body fit is analysed at different temperatures for different combinations of mechanical tolerances. This offers insights when compared to ISIS operational sources. A new anode with modified tolerance dimensions for improved fit is being manufactured and will be tested in June 2016.

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TUPMR033

Low Emittance Growth in a LEBT with Un-neutralized Section

1317

L.R. Prost, J.-P. Carneiro, A.V. Shemyakin
Fermilab, Batavia, Illinois, USA

Funding: Operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the United States Department of Energy
In a Low Energy Beam Transport line (LEBT), the emittance growth due to the beam's own space charge is typically suppressed by way of neutralization from either electrons or ions, which originate from ionization of the background gas. In cases where the beam is chopped, the neutralization pattern changes throughout the beginning of the pulse, causing the Twiss parameters to differ significantly from their steady state values, which, in turn, may result in beam losses downstream. For a modest beam perveance, there is an alternative solution, in which the beam is kept un-neutralized in the portion of the LEBT that contains the chopper. The emittance can be nearly preserved if the transition to the un-neutralized section occurs where the beam exhibits low transverse tails. This report discusses the experimental realization of such a scheme at Fermilab's PXIE, where low beam emittance dilution was demonstrated

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

TUPMR034

Development and Tests of Beam Test Facility with New Spare RFQ for Spallation Neutron Source

1320

Y.W. Kang, A.V. Aleksandrov, M.S. Champion, M.T. Crofford, J. Moss, R.T. Roseberry, J.P. Schubert, M.P. Stockli, C.M. Stone, R.F. Welton, D.C. Williams, A.P. Zhukov
ORNL, Oak Ridge, Tennessee, USA
B. Han, S.W. Lee, M.E. Middendorf, J. Price, R.B. Saethre
ORNL RAD, Oak Ridge, Tennessee, USA

Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE.
The Beam Test Facility (BTF) has been constructed to validate the performance of the new RFQ, to study ion source improvements, and to support neutron moderator development and six-dimensional phase space measure-ments for SNS. The BTF includes an H⁻ ion source, Ra-dio-Frequency Quadrupole (RFQ), and Medium Energy Beam Transport (MEBT) beam diagnostics systems. A spare RFQ was built and fully RF tested in the BTF and will be installed in the SNS linac in the future. The test stand is ready to run with the H⁻ ion beam through the new RFQ to fully validate the RFQ performance. The RFQ was designed to have the beam characteristics iden-tical to the existing RFQ with improved operational relia-bility and stability. The H⁻ RF plasma ion source system includes new high power RF components for improved front-end system performance.

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