ECRIS2016 - List of Keywords (emittance)

Paper	Title	Other Keywords	Page
MOBO04	Recent Developments of RIKEN 28 GHz SC-ECRIS	ion, experiment, ECR, ion-source	10
	Y. Higurashi, H. Haba, M. Kidera, T. Nakagawa, J. Ohnishi, K. Ozeki RIKEN Nishina Center, Wako, Japan
	In the past two years, we tried to improve the performance of the RIKEN 28GHz SC-ECRIS for production of intense U ion beam. Usually, we used the sputtering method to produce U ion beam. Last year, we produced ~200e μA of U³⁵⁺ at the injected RF power of ~2.6kW, when slightly adding the U vapor with high temperature oven. For RIKEN RIBF experiment, we produced ~110 e μA of U³⁵⁺ beam with sputtering method longer than one month without break. In this case, we surly need very stable beam to increase the transmission efficiency in the accelerators and avoid the any damage of the components of the accelerator due to the high power beam. In this contribution, we will report the beam intensity of highly charged U ions as a function of various parameters (magnetic field strength, RF power, sputtering voltage etc.) and the effect of these parameters on the beam stability in detail. We also present the experience of the long term operation of the ion source for the RIKEN RIBF experiments.
	Slides MOBO04 [3.427 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-MOBO04
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WECO01	Intermediate Commissioning Results of the Required 140 mA/100 keV CW D⁺ ECR Injector of LIPAc, IFMIF's Prototype	ion, rfq, plasma, MMI	67
	B. Bolzon, N. Chauvin, R. Gobin, F. Senée CEA/IRFU, Gif-sur-Yvette, France P.-Y. Beauvais, H. Dzitko F4E, Germany L. Bellan, M. Comunian, E. Fagotti, A. Pisent INFN/LNL, Legnaro (PD), Italy L. Bellan Univ. degli Studi di Padova, Padova, Italy P. Cara, R. Heidinger Fusion for Energy, Garching, Germany F. Harrault CEA/DSM/IRFU, France R. Ichimiya, A. Ihara, A. Kasugai, T. Kitano, M. Komata, K. Kondo, K. Sakamoto, T. Shinya, M. Sugimoto QST, Aomori, Japan J. Knaster, A. Marqueta, K. Nishiyama, Y. Okumura, G. Pruneri, F. Scantamburlo IFMIF/EVEDA, Rokkasho, Japan
	The LIPAc accelerator aims to operate in Rokkasho Fusion Institute a 125 mA/CW deuteron beam at 9 MeV to validate the concept of IFMIF's accelerators that will operate in CW 125 mA at 40 MeV. The 2.45 GHz ECR injector developed by CEA-Saclay is designed to deliver 140 mA/100 keV CW D⁺ beam with 99% D⁺ fraction ratio. Its LEBT relies on a dual solenoid focusing system to transport and match the beam into the RFQ. The normalized RMS emittance at the RFQ injection cone is required to be within 0.25π mm·mrad to allow 96% transmission through the 9.81 m long RFQ. An equal perveance H⁺ beam of half current and half energy as nominal with D⁺ is used to avoid activation during commissioning. The injector commissioning at Rokkasho is divided into three phases to characterize the emittance between the two solenoids of the LEBT (A1) and just downstream the RFQ injection cone (A2) and the extraction system of the source (A3). Phase A1 has been achieved and phase A2 continues in 2016 in order to reach the required beam parameters and to match the beam into the RFQ. This paper reports the commissioning results of phase A1 and the intermediate ones of phase A2 for H⁺ and D⁺ beams.
	Slides WECO01 [4.783 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WECO01
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WECO03	Transverse Coupling of Ion Beams From an RCR Ion Source	ion, extraction, solenoid, coupling	76
	Y. Yang, Y. Liu, L.T. Sun, Y.J. Yuan, H.W. Zhao IMP/CAS, Lanzhou, People's Republic of China
	ECR ion source beam quality will deteriorate under the influence of beam transverse coupling and high-order magnetic field aberration. Ion beams from an ECR ion source will experience a descending axial magnetic field at the extraction region, leading to a strong transverse coupling to the extracted beam, with projection emittance growth both in horizontal and vertical and two eigen emittances separation. On the other hand, sextupole field in the ECR and the sextupole component in the analyzing dipole can also degrade the beam quality by resulting in beam distortion. Proper adjusting of the extraction field strength of the ion source and the pre-focusing solenoid field can help to weaken the correlation in the inter-plane phase spaces and reduce the projection emittances. Another approach to improve the beam quality is to compensate for the high-order magnetic fields. This paper presents the property of beam coupling in the transverse phase space by analytical theory and simulations. Some experimental results are also presented and discussed. In addition, a high-order compensation scheme is displayed, whose feasibility has been verified by preliminary tests with SECRAL at IMP.
	Slides WECO03 [5.500 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WECO03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP34	Recent Beam Dynamics Studies for the SCL Demo of RISP	ion, lattice, simulation, rfq	122
	H. Jin, I.S. Hong, J.-H. Jang IBS, Daejeon, Republic of Korea
	The Rare Isotope Science Project (RISP) has been developed the RAON accelerator to accelerate heavy ion and rare isotope beams for the various kinds of science programs. In the RAON accelerator, the beams created by a superconducting electron cyclotron resonance ion source (ECR-IS) will be accelerated by the Radio Frequency Quadrupole (RFQ) after passing through the Low Energy Beam Transport (LEBT) section. These accelerated beams will pass the Medium Energy Beam Transport (MEBT) section for the beam matching and be re-accelerated by the superconducting linac (SCL) for the higher beam energy. Prior to the construction of the RAON accelerator, the performance of each component of LEBT, RFQ, MEBT and SCL should be examined for the efficient mass production. Accordingly, we have been constructing the test facility, which is named SCL demo, since 2015. First beam test with an oxygen beam will be carried out at the end of 2016 and the next test with a bismuth beam will be performed in 2017. In this paper, we will present the beam dynamics studies with the recent lattice design of the SCL demo and describe the simulations results with the oxygen and bismuth beams.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WEPP34
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP35	Four-Dimension Transverse Phase-Space Distribution Measured by a Pepper-Pot Emittance Meter	ion, ECR, plasma, injection	125
	T. Nagatomo, O. Kamigaito, M. Kase, T. Nakagawa RIKEN Nishina Center, Wako, Japan J.W. Stetson NSCL, East Lansing, Michigan, USA V. Tzoganis Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Four-dimensional (4-D) transverse emittance of the highly charged heavy ion beam extracted from ECR ion source is invariant under linear 4-D symplectic operation. Thus, it is essential quantity to improve the beam quality. Measurement of the 4-D phase-space distribution provides quantitative and essential information to improve the efficiency of beam transport. We have developed an on-line pepper-pot-type emittance meter, which is a suitable device to obtain the 4-D phase-space distribution from an image of beamlets passing through the well-aligned pinholes. The emittance meter consists of a thin metal plate with a pinhole array, which is translated along the beam axis, and an imaging screen (P46) with a MCP. We optimized the analysis procedure to obtain the distribution so that the elapsed time of the process was shortened as less than 1 second, and which was enough short for on-line measurements. We will discuss the quality of the obtained 4-D distribution by comparing it with the one obtained from a simulation. Further, we will also discuss how the gas pressure of LEBT affects the 4-D distribution to establish to improve the beam brightness.
	Poster WEPP35 [2.753 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WEPP35
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOBO04

Recent Developments of RIKEN 28 GHz SC-ECRIS

ion, experiment, ECR, ion-source

10

Y. Higurashi, H. Haba, M. Kidera, T. Nakagawa, J. Ohnishi, K. Ozeki
RIKEN Nishina Center, Wako, Japan

In the past two years, we tried to improve the performance of the RIKEN 28GHz SC-ECRIS for production of intense U ion beam. Usually, we used the sputtering method to produce U ion beam. Last year, we produced ~200e μA of U³⁵⁺ at the injected RF power of ~2.6kW, when slightly adding the U vapor with high temperature oven. For RIKEN RIBF experiment, we produced ~110 e μA of U³⁵⁺ beam with sputtering method longer than one month without break. In this case, we surly need very stable beam to increase the transmission efficiency in the accelerators and avoid the any damage of the components of the accelerator due to the high power beam. In this contribution, we will report the beam intensity of highly charged U ions as a function of various parameters (magnetic field strength, RF power, sputtering voltage etc.) and the effect of these parameters on the beam stability in detail. We also present the experience of the long term operation of the ion source for the RIKEN RIBF experiments.

Slides MOBO04 [3.427 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-MOBO04

Export •

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

WECO01

Intermediate Commissioning Results of the Required 140 mA/100 keV CW D⁺ ECR Injector of LIPAc, IFMIF's Prototype

ion, rfq, plasma, MMI

67

B. Bolzon, N. Chauvin, R. Gobin, F. Senée
CEA/IRFU, Gif-sur-Yvette, France
P.-Y. Beauvais, H. Dzitko
F4E, Germany
L. Bellan, M. Comunian, E. Fagotti, A. Pisent
INFN/LNL, Legnaro (PD), Italy
L. Bellan
Univ. degli Studi di Padova, Padova, Italy
P. Cara, R. Heidinger
Fusion for Energy, Garching, Germany
F. Harrault
CEA/DSM/IRFU, France
R. Ichimiya, A. Ihara, A. Kasugai, T. Kitano, M. Komata, K. Kondo, K. Sakamoto, T. Shinya, M. Sugimoto
QST, Aomori, Japan
J. Knaster, A. Marqueta, K. Nishiyama, Y. Okumura, G. Pruneri, F. Scantamburlo
IFMIF/EVEDA, Rokkasho, Japan

The LIPAc accelerator aims to operate in Rokkasho Fusion Institute a 125 mA/CW deuteron beam at 9 MeV to validate the concept of IFMIF's accelerators that will operate in CW 125 mA at 40 MeV. The 2.45 GHz ECR injector developed by CEA-Saclay is designed to deliver 140 mA/100 keV CW D⁺ beam with 99% D⁺ fraction ratio. Its LEBT relies on a dual solenoid focusing system to transport and match the beam into the RFQ. The normalized RMS emittance at the RFQ injection cone is required to be within 0.25π mm·mrad to allow 96% transmission through the 9.81 m long RFQ. An equal perveance H⁺ beam of half current and half energy as nominal with D⁺ is used to avoid activation during commissioning. The injector commissioning at Rokkasho is divided into three phases to characterize the emittance between the two solenoids of the LEBT (A1) and just downstream the RFQ injection cone (A2) and the extraction system of the source (A3). Phase A1 has been achieved and phase A2 continues in 2016 in order to reach the required beam parameters and to match the beam into the RFQ. This paper reports the commissioning results of phase A1 and the intermediate ones of phase A2 for H⁺ and D⁺ beams.

Slides WECO01 [4.783 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WECO01

Export •

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

WECO03

Transverse Coupling of Ion Beams From an RCR Ion Source

ion, extraction, solenoid, coupling

76

Y. Yang, Y. Liu, L.T. Sun, Y.J. Yuan, H.W. Zhao
IMP/CAS, Lanzhou, People's Republic of China

ECR ion source beam quality will deteriorate under the influence of beam transverse coupling and high-order magnetic field aberration. Ion beams from an ECR ion source will experience a descending axial magnetic field at the extraction region, leading to a strong transverse coupling to the extracted beam, with projection emittance growth both in horizontal and vertical and two eigen emittances separation. On the other hand, sextupole field in the ECR and the sextupole component in the analyzing dipole can also degrade the beam quality by resulting in beam distortion. Proper adjusting of the extraction field strength of the ion source and the pre-focusing solenoid field can help to weaken the correlation in the inter-plane phase spaces and reduce the projection emittances. Another approach to improve the beam quality is to compensate for the high-order magnetic fields. This paper presents the property of beam coupling in the transverse phase space by analytical theory and simulations. Some experimental results are also presented and discussed. In addition, a high-order compensation scheme is displayed, whose feasibility has been verified by preliminary tests with SECRAL at IMP.

Slides WECO03 [5.500 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WECO03

Export •

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

WEPP34

Recent Beam Dynamics Studies for the SCL Demo of RISP

ion, lattice, simulation, rfq

122

H. Jin, I.S. Hong, J.-H. Jang
IBS, Daejeon, Republic of Korea

The Rare Isotope Science Project (RISP) has been developed the RAON accelerator to accelerate heavy ion and rare isotope beams for the various kinds of science programs. In the RAON accelerator, the beams created by a superconducting electron cyclotron resonance ion source (ECR-IS) will be accelerated by the Radio Frequency Quadrupole (RFQ) after passing through the Low Energy Beam Transport (LEBT) section. These accelerated beams will pass the Medium Energy Beam Transport (MEBT) section for the beam matching and be re-accelerated by the superconducting linac (SCL) for the higher beam energy. Prior to the construction of the RAON accelerator, the performance of each component of LEBT, RFQ, MEBT and SCL should be examined for the efficient mass production. Accordingly, we have been constructing the test facility, which is named SCL demo, since 2015. First beam test with an oxygen beam will be carried out at the end of 2016 and the next test with a bismuth beam will be performed in 2017. In this paper, we will present the beam dynamics studies with the recent lattice design of the SCL demo and describe the simulations results with the oxygen and bismuth beams.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WEPP34

Export •

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

WEPP35

Four-Dimension Transverse Phase-Space Distribution Measured by a Pepper-Pot Emittance Meter

ion, ECR, plasma, injection

125

T. Nagatomo, O. Kamigaito, M. Kase, T. Nakagawa
RIKEN Nishina Center, Wako, Japan
J.W. Stetson
NSCL, East Lansing, Michigan, USA
V. Tzoganis
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Four-dimensional (4-D) transverse emittance of the highly charged heavy ion beam extracted from ECR ion source is invariant under linear 4-D symplectic operation. Thus, it is essential quantity to improve the beam quality. Measurement of the 4-D phase-space distribution provides quantitative and essential information to improve the efficiency of beam transport. We have developed an on-line pepper-pot-type emittance meter, which is a suitable device to obtain the 4-D phase-space distribution from an image of beamlets passing through the well-aligned pinholes. The emittance meter consists of a thin metal plate with a pinhole array, which is translated along the beam axis, and an imaging screen (P46) with a MCP. We optimized the analysis procedure to obtain the distribution so that the elapsed time of the process was shortened as less than 1 second, and which was enough short for on-line measurements. We will discuss the quality of the obtained 4-D distribution by comparing it with the one obtained from a simulation. Further, we will also discuss how the gas pressure of LEBT affects the 4-D distribution to establish to improve the beam brightness.

Poster WEPP35 [2.753 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WEPP35

Export •

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