IPAC2014 - Classification: 03 Particle Sources and Alternative Acceleration Techniques / T01 Proton and Ion Sources

Paper	Title	Page
MOPME024	Progress of the RF Negative Ion Source Research at HUST	430
	D.Z. Chen, M. Fan, J. Huang, X.F. Li, K.F. Liu, C. Wang, H.K. Yue, C. Zhou HUST, Wuhan, People's Republic of China J.C. Huang, D. Li, D.W. Liu, Z. Zhang Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
	Funding: Ministry of Science and Technology of China To promote the research and talent cultivation for ITER negative ion sources, Huazhong University of Science and Technology (HUST) has started to develop an experimental facility since 2011 under the support of Ministry of Science and Technology of China. As the first stage, we are building a radio frequency (RF) driver which will produce the plasma for yielding negative ions in the next stage. A deal of experimental research has been carried out on the setup.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME024
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MOPRI008	A Compact 2.45 GHz Microwave IOn Source Based High Fluence Irradiation Facility at IUAC, Delhi	592
SUSPSNE028	use link to see paper's listing under its alternate paper code
	N. Kumar, R. Ahuja, R.N. Dutt, D. Kanjilal, P.S. Lakshmy, Y. Mathur, G.O. Rodrigues IUAC, New Delhi, India
	A compact 2.45 GHz microwave ion source based low energy ion been facility has been developed for performing various experiments in material science and for studies related to plasma physics. The design of the compact microwave source is based on a tunable permanent magnet configuration and is powered by a 2 kW magnetron [1,2]. The double walled, water cooled stainless steel plasma chamber and ridge waveguide have been fabricated using the latest ‘LaserCUSING’ technique. The electron energy distribution functions have been measured in a similar low frequency ion source and validated by model calculations [1]. Extraction of the beam can also be performed at very low voltages in the order of hundreds of volts with high intensities by nullifying the space charge effects with the secondary electrons. The facility will be used for ion implantation, phase formation, surface etching and pattering experiments. The design aspects of the microwave ion source and low energy beam transport system will be presented. * “Studies on the effect of the axial magnetic field on the x-ray bremsstrahlung in a 2.45 GHz permanent magnet microwave ion source” Narender Kumar et. al. accepted for publication in RSI.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI008
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MOPRI009	Study on New Method for Generating Highly Charged Ions with Double Pulse Laser Ion Source	595
SUSPSNE029	use link to see paper's listing under its alternate paper code
	T. Shibuya TIT, Tokyo, Japan N. Hayashizaki RLNR, Tokyo, Japan M. Yoshida KEK, Ibaraki, Japan
	Laser ion source capable of generating high intensity ions is best for the ion source of RI beam facilities. A great deal of effort has been made on particle number as DPIS. Only few attempts have so far been made at generating highly charged ions. One of previous research has reported that Au+53 ions are produced by PALS laser. "Nonlinear process" mechanisms such as resonance absorption and self-focusing were used for this. However, these methods have limitation due to low repetition rate of the laser. Nd (λ=1064nm, E<1.2J, t~10ns) and Yb laser(λ=1030nm, E<10J, t~500fs) systems is possible to operate at 10 - 50Hz repetition rate. This double pulse laser system, with attainable laser intensity up to about 1017[W/cm²], was used to generate highly charged ions of solid target. First, the Nd laser creates a plasma plume. Next, the Yb laser reheats plasma plume by high intensity pulse at delay time of nanosecond. The properties of ions were investigated mainly on the base of time-of-flight method.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI009
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MOPRI010	Laser Ablation Ion Source for the KEK Digital Accelerator	598
	N. Munemoto Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan Y. Fuwa, S. Ikeda, M. Kumaki RIKEN, Saitama, Japan Y. Fuwa Kyoto ICR, Uji, Kyoto, Japan S. Ikeda, K. Takayama TIT, Yokohama, Japan M. Kumaki RISE, Tokyo, Japan M. Okamura BNL, Upton, Long Island, New York, USA S. Takano, K. Takayama KEK, Ibaraki, Japan K. Takayama Sokendai, Ibaraki, Japan
	KEK Digital Accelerator (DA) is a small scale induction synchrotron and operated at 10Hz and recently has succeeded to accelerate gaseous ions. There is a strong demand of fully striped carbon ions because the DA is regarded as the second generation of cancer therapy driver, which does not require an injector and electron stripper. We need a novel carbon ion source providing C⁶⁺ beams, which are directly injected into the DA and accelerated up to required energy. For this purpose, a laser ablation ion source(LAIS) is promising. To obtain high yield C⁶⁺ ions from ablation plasma, the laser irradiation condition has been evaluated and relationship between beam properties of charge spectrum, intensity, and temperature, and carbon target materials were examined. Two laser systems, long pulse (6 ns) and short pulse (170 ps), were employed to irradiate a graphite and amorphous carbon target. The current densities and profile of the generated plasmas in time were measured and charge state distributions were analyzed. In addition we will report a full design integrating this LAIS, the extraction system, the longitudinal chopper system, and the low energy beam transport line. T.Yoshimoto et al., presented in this conference ** N.Munemoto et al., Proceedings of ICIS2013, published in Rev. Sci. Inst.
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MOPRI011	Control of Plasma Flux with Pulsed Solenoid for Laser Ion Source	601
SUSPSNE027	use link to see paper's listing under its alternate paper code
	S. Ikeda, K. Horioka TIT, Yokohama, Japan Y. Fuwa, S. Ikeda, M. Kumaki RIKEN, Saitama, Japan T. Kanesue, M. Okamura BNL, Upton, Long Island, New York, USA
	We discuss the behavior of laser-ablation plasma spreading through a pulsed solenoidal field to minimize the beam emittance of laser-ablation ion source (LIS). LIS is expected to produce high-flux and low emittance ion beams from various solid materials in vacuum because of the high drift velocity and low temperature of the ablation plasma due to the adiabatic expansion. However, the ion flux level from the ablation plasma into an extraction gap changes within a pulse and then the shape of the sheath boundary changes transiently. Then, the integrated emittance is larger than the stroboscopic emittance at a certain time slice. To prevent the transient effect, we tried to control the plasma flux with a pulsed solenoidal magnetic field. The field is expected to change the direction of the plasma flow like a lens. By changing the magnetic flux density according to the transient flux level of ablation plasma, we can expect to control the plasma flux at the extraction gap. To investigate the controllability of the plasma flow, we measured the plasma flux as a function of parameters of the pulsed magnetic field. We scanned ion probes along the beam.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI011
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MOPRI012	High Current Low Emittance Proton And Deuteron Beam Production at SMIS 37	604
	I. Izotov, S. Golubev, S. Razin, V. Sidorov, V. Skalyga IAP/RAS, Nizhny Novgorod, Russia T. Kalvas, H. A. Koivisto, O.A. Tarvainen JYFL, Jyväskylä, Finland
	This work presents the latest results of high current proton and deuteron beam production at SMIS 37 facility at the Institute of Applied Physics (IAP RAS). This facility creates and heats up the plasma by 37.5 GHz gyrotron radiation with power up to 100 kW in a simple mirror trap meeting the ECR condition. High microwave power and frequency allow sustaining plasma of significantly higher density (Ne up to 2·10¹³ cm^-3) in comparison to conventional ECRISes or other microwave ion sources. The low ion temperature, on the order of a few eV, is beneficial to produce ion beams with low emittance. Latest experiments at SMIS 37 were performed using a single-aperture two-electrode extraction system. Various diameters of plasma electrode apertures i.e. 5 mm, 7 mm, 10 mm, were tested yielding proton and deuteron beams with currents up to 500 mA with RMS emittance lower than 0.2 π·mm·mrad at extraction voltages up to 45 kV. The maximum beam current density was measured to be 800 mA/cm². A possibility of further improvement through the development of an advanced extraction system is discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI012
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MOPRI013	Development of a 14.5 – 18 GHz ECR Ion Source at University of Huelva	607
	I. Martel, C. Bonțoiu, A.C.C. Villari University of Huelva, Huelva, Spain A. Garbayo AVS, Elgoibar, Spain A.C.C. Villari FRIB, East Lansing, Michigan, USA
	Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA. A double-frequency ECR ion source has been modelled numerically for high-efficiency ion production from protons to uranium. The simulations were targeted at optimizing magnetic confinement of the hot electrons through an iterative design of three solenoids and a dodecapole. In addition a plasma production model has been implemented in order to study ion species yield from neutral gases and their drift towards the cold plasma regions. Eventually, ion extraction and beam capture in the space-charge regime have been performed. Mechanical design studies approached the plasma chamber cooling and magnet coils refrigeration.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI013
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MOPRI014	Extracting a High Current Long Pulse Hminus Beam for FETS	611
	D.C. Faircloth, M. Cannon, S.R. Lawrie, M. Perkins STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom C. Gabor STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	The Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL) requires a 60 mA 2 ms 50 Hz Hminus beam. A Penning Surface Plasma Source is used to produce the beam. This paper gives the latest results obtained using a new 25 kV long pulse extraction power supply designed and built at RAL. Power supply performance, beam current and emittance are detailed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI014
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MOPRI015	Installing the VESPA H⁻ Ion Source Test Stand at RAL	614
	S.R. Lawrie, D.C. Faircloth, A.P. Letchford, M. Perkins, M. Whitehead, T. Wood STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	A Penning-type negative hydrogen (H) ion source has been used reliably on the ISIS pulsed spallation neutron and muon facility at the Rutherford Appleton Laboratory (RAL) in the UK for almost 30 years. However a detailed study of the ion source plasma and extraction has never been undertaken. If these properties were known, the beam emittance and losses due to collimation could be reduced, and the lifetime increased. This paper summarises the progress made on installing a Vessel for Extraction and Source Plasma Analyses (VESPA) to fill the knowledge gap.
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MOPRI016	Hydrogen and Cesium Monitor for H⁻ Magnetron Sources	617
	C.-Y. Tan, D.S. Bollinger, B.A. Schupbach, K. Seiya Fermilab, Batavia, Illinois, USA
	Funding: Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energ The relative concentration of cesium to hydrogen in the plasma of a H⁻ magnetron source is an important parameter for reliable operations. If there is too much cesium, the surfaces of the source become contaminated with it and sparking occurs. If there is too little cesium then the plasma cannot be sustained. In order to monitor these two elements, a spectrometer has been built and installed on a test and operating source that looks at the plasma. It is hypothesized that the concentration of each element in the plasma is proportional to the intensity of their spectral lines.
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WEOAB01	The Commissioning of the Laser Ion Source for RHIC-EBIS	1890
	T. Kanesue, J.G. Alessi, E.N. Beebe, M.R. Costanzo, L. DeSanto, R.F. Lambiase, D. Lehn, C.J. Liaw, V. LoDestro, M. Okamura, R.H. Olsen, A.I. Pikin, D. Raparia, A.N. Steszyn BNL, Upton, Long Island, New York, USA S. Ikeda TIT, Yokohama, Japan K. Kondo, M. Sekine RLNR, Tokyo, Japan
	Funding: Work supported by NASA and Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy A new laser ion source (LIS) for low charge state ion production was installed on RHIC-EBIS. This is the first LIS to be combined with an Electron Beam Ion Source (EBIS) type heavy ion source. The LIS provides intense low charge state ions from any solid state material, with low emittance and narrow pulse length. These features make it suitable as an external source of 1+ ions that can be injected into the EBIS trap for charge breeding. In addition, a LIS is the only type ion source which can allow rapid switching among many ion species, even on pulse-by-pulse basis, by changing either laser path or target position, to strike the material of choice. The EBIS works as a charge breeder, with the extracted high charge state ions used in the following accelerators. The beams from LIS will be used for RHIC and NASA Space Radiation Laboratory (NSRL) at BNL. The rapid beam switching, which was not possible with existing ion sources, will expand the research field at NSRL as a galactic cosmic ray simulator. The results of commissioning will be shown.
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Paper

Title

Page

Progress of the RF Negative Ion Source Research at HUST

430

D.Z. Chen, M. Fan, J. Huang, X.F. Li, K.F. Liu, C. Wang, H.K. Yue, C. Zhou
HUST, Wuhan, People's Republic of China
J.C. Huang, D. Li, D.W. Liu, Z. Zhang
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China

Funding: Ministry of Science and Technology of China
To promote the research and talent cultivation for ITER negative ion sources, Huazhong University of Science and Technology (HUST) has started to develop an experimental facility since 2011 under the support of Ministry of Science and Technology of China. As the first stage, we are building a radio frequency (RF) driver which will produce the plasma for yielding negative ions in the next stage. A deal of experimental research has been carried out on the setup.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME024

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MOPRI008

A Compact 2.45 GHz Microwave IOn Source Based High Fluence Irradiation Facility at IUAC, Delhi

592

SUSPSNE028

use link to see paper's listing under its alternate paper code

N. Kumar, R. Ahuja, R.N. Dutt, D. Kanjilal, P.S. Lakshmy, Y. Mathur, G.O. Rodrigues
IUAC, New Delhi, India

A compact 2.45 GHz microwave ion source based low energy ion been facility has been developed for performing various experiments in material science and for studies related to plasma physics. The design of the compact microwave source is based on a tunable permanent magnet configuration and is powered by a 2 kW magnetron [1,2]. The double walled, water cooled stainless steel plasma chamber and ridge waveguide have been fabricated using the latest ‘LaserCUSING’ technique. The electron energy distribution functions have been measured in a similar low frequency ion source and validated by model calculations [1]. Extraction of the beam can also be performed at very low voltages in the order of hundreds of volts with high intensities by nullifying the space charge effects with the secondary electrons. The facility will be used for ion implantation, phase formation, surface etching and pattering experiments. The design aspects of the microwave ion source and low energy beam transport system will be presented.
* “Studies on the effect of the axial magnetic field on the x-ray bremsstrahlung in a 2.45 GHz permanent magnet microwave ion source” Narender Kumar et. al. accepted for publication in RSI.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI008

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MOPRI009

Study on New Method for Generating Highly Charged Ions with Double Pulse Laser Ion Source

595

SUSPSNE029

use link to see paper's listing under its alternate paper code

T. Shibuya
TIT, Tokyo, Japan
N. Hayashizaki
RLNR, Tokyo, Japan
M. Yoshida
KEK, Ibaraki, Japan

Laser ion source capable of generating high intensity ions is best for the ion source of RI beam facilities. A great deal of effort has been made on particle number as DPIS. Only few attempts have so far been made at generating highly charged ions. One of previous research has reported that Au+53 ions are produced by PALS laser. "Nonlinear process" mechanisms such as resonance absorption and self-focusing were used for this. However, these methods have limitation due to low repetition rate of the laser. Nd (λ=1064nm, E<1.2J, t~10ns) and Yb laser(λ=1030nm, E<10J, t~500fs) systems is possible to operate at 10 - 50Hz repetition rate. This double pulse laser system, with attainable laser intensity up to about 1017[W/cm²], was used to generate highly charged ions of solid target. First, the Nd laser creates a plasma plume. Next, the Yb laser reheats plasma plume by high intensity pulse at delay time of nanosecond. The properties of ions were investigated mainly on the base of time-of-flight method.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI009

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MOPRI010

Laser Ablation Ion Source for the KEK Digital Accelerator

598

N. Munemoto
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
Y. Fuwa, S. Ikeda, M. Kumaki
RIKEN, Saitama, Japan
Y. Fuwa
Kyoto ICR, Uji, Kyoto, Japan
S. Ikeda, K. Takayama
TIT, Yokohama, Japan
M. Kumaki
RISE, Tokyo, Japan
M. Okamura
BNL, Upton, Long Island, New York, USA
S. Takano, K. Takayama
KEK, Ibaraki, Japan
K. Takayama
Sokendai, Ibaraki, Japan

KEK Digital Accelerator (DA) is a small scale induction synchrotron and operated at 10Hz and recently has succeeded to accelerate gaseous ions*. There is a strong demand of fully striped carbon ions because the DA is regarded as the second generation of cancer therapy driver, which does not require an injector and electron stripper. We need a novel carbon ion source providing C⁶⁺ beams, which are directly injected into the DA and accelerated up to required energy. For this purpose, a laser ablation ion source(LAIS) is promising**. To obtain high yield C⁶⁺ ions from ablation plasma, the laser irradiation condition has been evaluated and relationship between beam properties of charge spectrum, intensity, and temperature, and carbon target materials were examined. Two laser systems, long pulse (6 ns) and short pulse (170 ps), were employed to irradiate a graphite and amorphous carbon target. The current densities and profile of the generated plasmas in time were measured and charge state distributions were analyzed. In addition we will report a full design integrating this LAIS, the extraction system, the longitudinal chopper system, and the low energy beam transport line.
* T.Yoshimoto et al., presented in this conference
** N.Munemoto et al., Proceedings of ICIS2013, published in Rev. Sci. Inst.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI010

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MOPRI011

Control of Plasma Flux with Pulsed Solenoid for Laser Ion Source

601

SUSPSNE027

use link to see paper's listing under its alternate paper code

S. Ikeda, K. Horioka
TIT, Yokohama, Japan
Y. Fuwa, S. Ikeda, M. Kumaki
RIKEN, Saitama, Japan
T. Kanesue, M. Okamura
BNL, Upton, Long Island, New York, USA

We discuss the behavior of laser-ablation plasma spreading through a pulsed solenoidal field to minimize the beam emittance of laser-ablation ion source (LIS). LIS is expected to produce high-flux and low emittance ion beams from various solid materials in vacuum because of the high drift velocity and low temperature of the ablation plasma due to the adiabatic expansion. However, the ion flux level from the ablation plasma into an extraction gap changes within a pulse and then the shape of the sheath boundary changes transiently. Then, the integrated emittance is larger than the stroboscopic emittance at a certain time slice. To prevent the transient effect, we tried to control the plasma flux with a pulsed solenoidal magnetic field. The field is expected to change the direction of the plasma flow like a lens. By changing the magnetic flux density according to the transient flux level of ablation plasma, we can expect to control the plasma flux at the extraction gap. To investigate the controllability of the plasma flow, we measured the plasma flux as a function of parameters of the pulsed magnetic field. We scanned ion probes along the beam.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI011

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MOPRI012

High Current Low Emittance Proton And Deuteron Beam Production at SMIS 37

604

I. Izotov, S. Golubev, S. Razin, V. Sidorov, V. Skalyga
IAP/RAS, Nizhny Novgorod, Russia
T. Kalvas, H. A. Koivisto, O.A. Tarvainen
JYFL, Jyväskylä, Finland

This work presents the latest results of high current proton and deuteron beam production at SMIS 37 facility at the Institute of Applied Physics (IAP RAS). This facility creates and heats up the plasma by 37.5 GHz gyrotron radiation with power up to 100 kW in a simple mirror trap meeting the ECR condition. High microwave power and frequency allow sustaining plasma of significantly higher density (Ne up to 2·10¹³ cm^-3) in comparison to conventional ECRISes or other microwave ion sources. The low ion temperature, on the order of a few eV, is beneficial to produce ion beams with low emittance. Latest experiments at SMIS 37 were performed using a single-aperture two-electrode extraction system. Various diameters of plasma electrode apertures i.e. 5 mm, 7 mm, 10 mm, were tested yielding proton and deuteron beams with currents up to 500 mA with RMS emittance lower than 0.2 π·mm·mrad at extraction voltages up to 45 kV. The maximum beam current density was measured to be 800 mA/cm². A possibility of further improvement through the development of an advanced extraction system is discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI012

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MOPRI013

Development of a 14.5 – 18 GHz ECR Ion Source at University of Huelva

607

I. Martel, C. Bonțoiu, A.C.C. Villari
University of Huelva, Huelva, Spain
A. Garbayo
AVS, Elgoibar, Spain
A.C.C. Villari
FRIB, East Lansing, Michigan, USA

Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA.
A double-frequency ECR ion source has been modelled numerically for high-efficiency ion production from protons to uranium. The simulations were targeted at optimizing magnetic confinement of the hot electrons through an iterative design of three solenoids and a dodecapole. In addition a plasma production model has been implemented in order to study ion species yield from neutral gases and their drift towards the cold plasma regions. Eventually, ion extraction and beam capture in the space-charge regime have been performed. Mechanical design studies approached the plasma chamber cooling and magnet coils refrigeration.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI013

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MOPRI014

Extracting a High Current Long Pulse Hminus Beam for FETS

611

D.C. Faircloth, M. Cannon, S.R. Lawrie, M. Perkins
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

The Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL) requires a 60 mA 2 ms 50 Hz Hminus beam. A Penning Surface Plasma Source is used to produce the beam. This paper gives the latest results obtained using a new 25 kV long pulse extraction power supply designed and built at RAL. Power supply performance, beam current and emittance are detailed.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI014

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MOPRI015

Installing the VESPA H⁻ Ion Source Test Stand at RAL

614

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

A Penning-type negative hydrogen (H) ion source has been used reliably on the ISIS pulsed spallation neutron and muon facility at the Rutherford Appleton Laboratory (RAL) in the UK for almost 30 years. However a detailed study of the ion source plasma and extraction has never been undertaken. If these properties were known, the beam emittance and losses due to collimation could be reduced, and the lifetime increased. This paper summarises the progress made on installing a Vessel for Extraction and Source Plasma Analyses (VESPA) to fill the knowledge gap.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI015

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MOPRI016

Hydrogen and Cesium Monitor for H⁻ Magnetron Sources

617

C.-Y. Tan, D.S. Bollinger, B.A. Schupbach, K. Seiya
Fermilab, Batavia, Illinois, USA

Funding: Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energ
The relative concentration of cesium to hydrogen in the plasma of a H⁻ magnetron source is an important parameter for reliable operations. If there is too much cesium, the surfaces of the source become contaminated with it and sparking occurs. If there is too little cesium then the plasma cannot be sustained. In order to monitor these two elements, a spectrometer has been built and installed on a test and operating source that looks at the plasma. It is hypothesized that the concentration of each element in the plasma is proportional to the intensity of their spectral lines.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI016

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WEOAB01

The Commissioning of the Laser Ion Source for RHIC-EBIS

1890

T. Kanesue, J.G. Alessi, E.N. Beebe, M.R. Costanzo, L. DeSanto, R.F. Lambiase, D. Lehn, C.J. Liaw, V. LoDestro, M. Okamura, R.H. Olsen, A.I. Pikin, D. Raparia, A.N. Steszyn
BNL, Upton, Long Island, New York, USA
S. Ikeda
TIT, Yokohama, Japan
K. Kondo, M. Sekine
RLNR, Tokyo, Japan

Funding: Work supported by NASA and Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
A new laser ion source (LIS) for low charge state ion production was installed on RHIC-EBIS. This is the first LIS to be combined with an Electron Beam Ion Source (EBIS) type heavy ion source. The LIS provides intense low charge state ions from any solid state material, with low emittance and narrow pulse length. These features make it suitable as an external source of 1+ ions that can be injected into the EBIS trap for charge breeding. In addition, a LIS is the only type ion source which can allow rapid switching among many ion species, even on pulse-by-pulse basis, by changing either laser path or target position, to strike the material of choice. The EBIS works as a charge breeder, with the extracted high charge state ions used in the following accelerators. The beams from LIS will be used for RHIC and NASA Space Radiation Laboratory (NSRL) at BNL. The rapid beam switching, which was not possible with existing ion sources, will expand the research field at NSRL as a galactic cosmic ray simulator. The results of commissioning will be shown.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEOAB01

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