ECRIS2010 - List of Keywords (controls)

Paper	Title	Other Keywords	Page
TUCOCK04	Mass Spectrometry with an ECR Ion Source	ion-source, ion, background, ECR	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]

TUPOT004	Microgan ECR Ion Source in a Van de Graaff Accelerator Terminal	ion, ion-source, high-voltage, ECR	120
	G. Gaubert, C. Bieth, W. Bougy, B.N. Brionne, X. Donzel, A. Sineau, O. Tasset, C. Vallerand, A.C.C. Villari PANTECHNIK, BAYEUX, France C. Chavez-de-Jesus, T. Gamboni, W. Geerts, G. Giorginis, R. Jaime Tornin, G. Lövestam, W. Mondelaers JRC/IRMM, Geel, Belgium
	The Van de Graaff accelerator at IRMM works since many years providing proton, deuteron and helium beams for nuclear data measurements. The original ion source was of RF type with quartz bottle. This kind of source, as well known, needs regular maintenance for which the accelerator tank must be completely opened. The heavy usage at high currents of the IRMM accelerator necessitated an opening about once every month. Recently, the full permanent magnet Microgan ECR ion source from PANTECHNIK was installed into a new terminal platform together with a solid state amplifier of 50W, a dedicated dosing system for 4 gases (with respective gas bottles H2, D2, He and Ar), and a set of dedicated power supplies and electronic devices for the remote tuning of the source. The new system shows a very stable behavior of the produced beam allowing running the Van de Graff without maintenance for several months. This contribution will describe the full installed system in details (working at high pressure in the terminal, spark effects and optic of the extraction).
	Poster TUPOT004 [1.715 MB]

TUPOT006	Using Mass-Flow Controllers for Obtaining Extremely Stable ECR Ion Source Beams	ion, injection, ECR, ion-source	127
	X. Donzel, W. Bougy, B.N. Brionne, G. Gaubert, A. Sineau, O. Tasset, C. Vallerand, A.C.C. Villari PANTECHNIK, BAYEUX, France R. Leroy GANIL, Caen, France
	Beam stability and reproducibility is of paramount importance in applications requiring precise control of implanted radiation dose, like in the case of Hadrontherapy. The beam intensity over several weeks or months should be kept constant. Moreover, the timing for changing the nature of the beam and, as a consequence, the tuning of the source should be minimized. Standard valves usually used in conjunction of ECR ion sources have the disadvantage of controlling the conductance, which can vary significantly with external conditions, like ambient temperature and inlet pressure of the gas. The use of flow controllers is the natural way for avoiding these external constraints. In this contribution we present the results obtained using a new model of Mass-flow controller in the source Supernanogan, for production of C⁴⁺ and H³⁺ beams. Extremely stable beams (± 2.5%) without retuning of the source over several weeks could be obtained. The reproducibility of the source tuning parameters could also be demonstrated.
	Poster TUPOT006 [4.386 MB]

Paper

Title

Other Keywords

Page

TUCOCK04

Mass Spectrometry with an ECR Ion Source

ion-source, ion, background, ECR

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]

TUPOT004

Microgan ECR Ion Source in a Van de Graaff Accelerator Terminal

ion, ion-source, high-voltage, ECR

120

G. Gaubert, C. Bieth, W. Bougy, B.N. Brionne, X. Donzel, A. Sineau, O. Tasset, C. Vallerand, A.C.C. Villari
PANTECHNIK, BAYEUX, France
C. Chavez-de-Jesus, T. Gamboni, W. Geerts, G. Giorginis, R. Jaime Tornin, G. Lövestam, W. Mondelaers
JRC/IRMM, Geel, Belgium

The Van de Graaff accelerator at IRMM works since many years providing proton, deuteron and helium beams for nuclear data measurements. The original ion source was of RF type with quartz bottle. This kind of source, as well known, needs regular maintenance for which the accelerator tank must be completely opened. The heavy usage at high currents of the IRMM accelerator necessitated an opening about once every month. Recently, the full permanent magnet Microgan ECR ion source from PANTECHNIK was installed into a new terminal platform together with a solid state amplifier of 50W, a dedicated dosing system for 4 gases (with respective gas bottles H2, D2, He and Ar), and a set of dedicated power supplies and electronic devices for the remote tuning of the source. The new system shows a very stable behavior of the produced beam allowing running the Van de Graff without maintenance for several months. This contribution will describe the full installed system in details (working at high pressure in the terminal, spark effects and optic of the extraction).

Poster TUPOT004 [1.715 MB]

TUPOT006

Using Mass-Flow Controllers for Obtaining Extremely Stable ECR Ion Source Beams

ion, injection, ECR, ion-source

127

X. Donzel, W. Bougy, B.N. Brionne, G. Gaubert, A. Sineau, O. Tasset, C. Vallerand, A.C.C. Villari
PANTECHNIK, BAYEUX, France
R. Leroy
GANIL, Caen, France

Beam stability and reproducibility is of paramount importance in applications requiring precise control of implanted radiation dose, like in the case of Hadrontherapy. The beam intensity over several weeks or months should be kept constant. Moreover, the timing for changing the nature of the beam and, as a consequence, the tuning of the source should be minimized. Standard valves usually used in conjunction of ECR ion sources have the disadvantage of controlling the conductance, which can vary significantly with external conditions, like ambient temperature and inlet pressure of the gas. The use of flow controllers is the natural way for avoiding these external constraints. In this contribution we present the results obtained using a new model of Mass-flow controller in the source Supernanogan, for production of C⁴⁺ and H³⁺ beams. Extremely stable beams (± 2.5%) without retuning of the source over several weeks could be obtained. The reproducibility of the source tuning parameters could also be demonstrated.

Poster TUPOT006 [4.386 MB]