ECRIS2010 - Table of Session: TUCOCK (Applications)

Paper

Title

Page

Beam, Multi-Beam and Broad Beam Production with COMIC Devices

99

P. Sortais, J. Angot, T. Lamy, J. Médard
LPSC, Grenoble Cedex, France
C. Peaucelle
IN2P3 IPNL, Villeurbanne, France

The COMIC discharge cavity is a very versatile technology. We will present new results and devices that match new applications like: molecular beams, ultra compact beam line for detectors calibrations, quartz source for on-line application, high voltage platform source, sputtering /assistance broad beams and finally, a quite new use, high energy multi¬-beam production for surface material modifications. In more details, we will show that the tiny discharge of COMIC can mainly produce molecular ions (H³⁺). We will present the preliminary operation of the fully quartz ISOLDE COMIC version, in collaboration with IPN-Lyon, we will present a first approach for a slit extraction version of a three cavity device, and after discussing about various extraction systems on the multi discharge device (41 cavities) we will show the low energy broad beam (2 KV) and high energy multi-beams (10 beams up to 30 KV) productions. We will specially present the different extraction systems adapted to each application and the beams characteristics which are strongly dependent on the voltage distribution of an accel-accel two electrodes extraction system.

Slides TUCOCK01 [4.960 MB]

TUCOCK02

Status of the High Current Permanent Magnet 2.45 GHz ECR Ion Source at Peking University

102

S.X. Peng, J.E. Chen, Z.Y. Guo, P.N. Lu, Y.R. Lu, H.T. Ren, Z.Z. Song, J.X. Yu, Z.X. Yuan, M. Zhang, J. Zhao
PKU/IHIP, Beijing, People's Republic of China

Several compact 2.45 GHz Electron Cyclotron Resonance Ion Sources (ECRIS) have been developed at Peking University for ion implantation[1], separated function Radio Frequency quadruple (SFRFQ)[2] and for the Peking University Neutron Imaging Facility (PKUNIFTY)[3]. Studies are focused on methods of magnetic field generation, magnetic fields configuration, microwave window design, microwave coupling, and structure selection of extraction electrodes. Up to now, our sources have produced 25 mA O+/ He⁺ ion, 10mA N+ ion, 100 mA H⁺ and 83 mA D⁺ ions, respectively. Details will be reported in the paper.
[1] Z. Song, D. Jiang, and J. Yu, Rev. Sci. Instr., 67,1003(1996).
[2] S. X. Peng, M. Zhang, Z. Z. Song, R. Xu, J. Zhao, Z. X. Yuan, J. X. Yu, J. Chen, Z. Y. Guo, Rev. Sci. Instr., 2008, 79: 02B706.
[3] M. Zhang, S. X. Peng, H. T. Ren, Z. Z. Song, Z. X. Yuan, Q. F. Zhou, P. N. Lu, R. Xu, J. Zhao, J. X. Yu, J. E. Chen, Z. Y. Guo, and Y. R. Lu, Rev. Sci. Instr. 2010, 81:02B715.

Slides TUCOCK02 [3.144 MB]

TUCOCK03

Development of 14.5 GHz Electron Cyclotron Resonance Ion Source at KAERI

105

B.H. Oh, D.S. Chang, C.K. Hwang, S.R. In, S.H. Jeong, J.T. Jin, K.W. Lee, C.S. Seo
KAERI, Daejon, Republic of Korea

A 14 GHz ECRIS has been designed and fabricated in KAERI (Korea Atomic Energy Research Institute) to produce multi-charged ion beam (especially for C⁶⁺ ion beam) for medical applications. The magnet system has solenoid coils made with copper conductor and a hexapole made with permanent magnet. The solenoid coils are composed of two axial coils to make mirror fields in both sides of the chamber and one trim coil at the center to control the layer of the resonance region. The hexapole is made with 24-sector NdFeB permanent magnet. Radial field higher than 1.2 T at the chamber wall position has been measured, and axial field higher than 1.7 T at the entrance center of RF power and 1.1 T at the exit center of ion beam have been measured. A welded tube with aluminum and stainless steel is used for a ECR plasma chamber to improve the production of secondary electron. Cooling channel is made on the wall of the Al tube. A 2 kW Krystron is used as a microwave energy source. A DC break made with PEEK(Polyether Ether Ketone) for high voltage insulation and field shielding, and a RF window made with ceramic for vacuum insulation are inserted in the RF circuit. A movable beam extractor with 8 mm aperture covers different species and different charge numbers of the beam. Experimental results on ECR plasma and initial beam extraction with KAERI ECR ion source will be discussed.

Slides TUCOCK03 [2.342 MB]

TUCOCK04

Mass Spectrometry with an ECR Ion Source

109

M.A.C. Hotchkis, D. Button
ANSTO, Menai, Australia

Several groups [1-3] have demonstrated the usefulness of ECR ion sources in forms of mass spectrometry, for the detection of rare long-lived radioisotopes, trace elements and stable isotope ratios. Mass spectrometry imposes strict constraints on the ion source. First, the ion source must be free of backgrounds at the same m/q ratio as isotope of interest. Backgrounds take several forms, including beams generated from residual gas or other materials in the source, either of the element of interest, or other elements which cause isobaric or other m/q ambiguities. Second, the ion source must exhibit a minimum ‘memory’ effect from sample to sample. We are interested in isotopic ratios of carbon, nitrogen and oxygen. These elements are ubiquitous in vacuum systems and so this work has its own particular challenges, especially in relation to the design and operational characteristics of the ion source. Initial work has revealed retention effects which reduce the sample clear out rates, and cause persistent backgrounds [4]. We will present results of our most recent efforts to control these problems.
[1] P. Collon et al., Nucl. Instrum. Methods B 2004; 223/224: 428.
[2] M. Kidera et al., Eur. J. Mass Spectrom. 2007; 13: 239.
[3] M. Hotchkis et al., Rapid Comm. Mass Spec. 2008; 22: 1408-1414.
[4] D. Button and M.A.C. Hotchkis, Proc. 18th ECRIS Workshop, Sept 15-18, 2008, Chicago, USA, http://www. JACoW.org/.

Slides TUCOCK04 [3.849 MB]

Paper	Title	Page
TUCOCK01	Beam, Multi-Beam and Broad Beam Production with COMIC Devices	99
	P. Sortais, J. Angot, T. Lamy, J. Médard LPSC, Grenoble Cedex, France C. Peaucelle IN2P3 IPNL, Villeurbanne, France
	The COMIC discharge cavity is a very versatile technology. We will present new results and devices that match new applications like: molecular beams, ultra compact beam line for detectors calibrations, quartz source for on-line application, high voltage platform source, sputtering /assistance broad beams and finally, a quite new use, high energy multi¬-beam production for surface material modifications. In more details, we will show that the tiny discharge of COMIC can mainly produce molecular ions (H³⁺). We will present the preliminary operation of the fully quartz ISOLDE COMIC version, in collaboration with IPN-Lyon, we will present a first approach for a slit extraction version of a three cavity device, and after discussing about various extraction systems on the multi discharge device (41 cavities) we will show the low energy broad beam (2 KV) and high energy multi-beams (10 beams up to 30 KV) productions. We will specially present the different extraction systems adapted to each application and the beams characteristics which are strongly dependent on the voltage distribution of an accel-accel two electrodes extraction system.
	Slides TUCOCK01 [4.960 MB]

TUCOCK02	Status of the High Current Permanent Magnet 2.45 GHz ECR Ion Source at Peking University	102
	S.X. Peng, J.E. Chen, Z.Y. Guo, P.N. Lu, Y.R. Lu, H.T. Ren, Z.Z. Song, J.X. Yu, Z.X. Yuan, M. Zhang, J. Zhao PKU/IHIP, Beijing, People's Republic of China
	Several compact 2.45 GHz Electron Cyclotron Resonance Ion Sources (ECRIS) have been developed at Peking University for ion implantation[1], separated function Radio Frequency quadruple (SFRFQ)[2] and for the Peking University Neutron Imaging Facility (PKUNIFTY)[3]. Studies are focused on methods of magnetic field generation, magnetic fields configuration, microwave window design, microwave coupling, and structure selection of extraction electrodes. Up to now, our sources have produced 25 mA O+/ He⁺ ion, 10mA N+ ion, 100 mA H⁺ and 83 mA D⁺ ions, respectively. Details will be reported in the paper. [1] Z. Song, D. Jiang, and J. Yu, Rev. Sci. Instr., 67,1003(1996). [2] S. X. Peng, M. Zhang, Z. Z. Song, R. Xu, J. Zhao, Z. X. Yuan, J. X. Yu, J. Chen, Z. Y. Guo, Rev. Sci. Instr., 2008, 79: 02B706. [3] M. Zhang, S. X. Peng, H. T. Ren, Z. Z. Song, Z. X. Yuan, Q. F. Zhou, P. N. Lu, R. Xu, J. Zhao, J. X. Yu, J. E. Chen, Z. Y. Guo, and Y. R. Lu, Rev. Sci. Instr. 2010, 81:02B715.
	Slides TUCOCK02 [3.144 MB]

TUCOCK03	Development of 14.5 GHz Electron Cyclotron Resonance Ion Source at KAERI	105
	B.H. Oh, D.S. Chang, C.K. Hwang, S.R. In, S.H. Jeong, J.T. Jin, K.W. Lee, C.S. Seo KAERI, Daejon, Republic of Korea
	A 14 GHz ECRIS has been designed and fabricated in KAERI (Korea Atomic Energy Research Institute) to produce multi-charged ion beam (especially for C⁶⁺ ion beam) for medical applications. The magnet system has solenoid coils made with copper conductor and a hexapole made with permanent magnet. The solenoid coils are composed of two axial coils to make mirror fields in both sides of the chamber and one trim coil at the center to control the layer of the resonance region. The hexapole is made with 24-sector NdFeB permanent magnet. Radial field higher than 1.2 T at the chamber wall position has been measured, and axial field higher than 1.7 T at the entrance center of RF power and 1.1 T at the exit center of ion beam have been measured. A welded tube with aluminum and stainless steel is used for a ECR plasma chamber to improve the production of secondary electron. Cooling channel is made on the wall of the Al tube. A 2 kW Krystron is used as a microwave energy source. A DC break made with PEEK(Polyether Ether Ketone) for high voltage insulation and field shielding, and a RF window made with ceramic for vacuum insulation are inserted in the RF circuit. A movable beam extractor with 8 mm aperture covers different species and different charge numbers of the beam. Experimental results on ECR plasma and initial beam extraction with KAERI ECR ion source will be discussed.
	Slides TUCOCK03 [2.342 MB]

TUCOCK04	Mass Spectrometry with an ECR Ion Source	109
	M.A.C. Hotchkis, D. Button ANSTO, Menai, Australia
	Several groups [1-3] have demonstrated the usefulness of ECR ion sources in forms of mass spectrometry, for the detection of rare long-lived radioisotopes, trace elements and stable isotope ratios. Mass spectrometry imposes strict constraints on the ion source. First, the ion source must be free of backgrounds at the same m/q ratio as isotope of interest. Backgrounds take several forms, including beams generated from residual gas or other materials in the source, either of the element of interest, or other elements which cause isobaric or other m/q ambiguities. Second, the ion source must exhibit a minimum ‘memory’ effect from sample to sample. We are interested in isotopic ratios of carbon, nitrogen and oxygen. These elements are ubiquitous in vacuum systems and so this work has its own particular challenges, especially in relation to the design and operational characteristics of the ion source. Initial work has revealed retention effects which reduce the sample clear out rates, and cause persistent backgrounds [4]. We will present results of our most recent efforts to control these problems. [1] P. Collon et al., Nucl. Instrum. Methods B 2004; 223/224: 428. [2] M. Kidera et al., Eur. J. Mass Spectrom. 2007; 13: 239. [3] M. Hotchkis et al., Rapid Comm. Mass Spec. 2008; 22: 1408-1414. [4] D. Button and M.A.C. Hotchkis, Proc. 18th ECRIS Workshop, Sept 15-18, 2008, Chicago, USA, http://www. JACoW.org/.
	Slides TUCOCK04 [3.849 MB]