Automated system for efficient microwave power coupling in an S-band ECR ion source driven under different operating conditions

Muguira, Leire; Portilla, J.; González, Pedro; Garmendia, N.; Feuchtwanger, J.; Etxebarria, V.; Eguiraun, M.; Arredondo, I.; Miracoli, R.; Belver, D.

doi:10.1016/j.nima.2013.12.054

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…When the microwave power is applied to the plasma chamber in presence of a magnetic field, the gas ionization and plasma formation processes take place [17]. Once the plasma is formed, impedance matching between the plasma impedance (load impedance) and the microwave generator impedance (source impedance) is necessary for maximum power transfer [18,19]. The plasma impedance is a complex time-varying parameter whereas the source impedance is static.…”

Section: Pulsed Beam Extraction From Cw Plasmamentioning

confidence: 99%

Experimental study of pulsed ion beam generated by different pulsing topology in 2.45 GHz ECR proton source

et al. 2021

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Section: Pulsed Beam Extraction From Cw Plasmamentioning

confidence: 99%

Experimental study of pulsed ion beam generated by different pulsing topology in 2.45 GHz ECR proton source

et al. 2021

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“…To inject the RF microwaves properly into the plasma chamber, a RF chain, consisting of a RF generator, a Klystron, an Automatic Tuner Unit (ATU, [17]) and several waveguide components, are employed. The RF generator provides a microwave signal, which is amplified by the Klystron up to a maximum of .…”

Section: B Rf Systemmentioning

confidence: 99%

“…The ATU is also a challenging device to control. It implements an autotuning system based on a look up table with feedback in order to automatically adjust the impedance matching [17].…”

Section: A Control Networkmentioning

confidence: 99%

Adjustable ECR Ion Source Control System: Ion Source Hydrogen Positive Project

Arredondo

Eguiraun

Jugo

et al. 2015

IEEE Trans. Nucl. Sci.

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ISHP (Ion Source Hydrogen Positive) project consists of a highly versatile ECR type ion source. It has been built for several purposes, on the one hand, to serve as a workbench to test accelerator related technologies and validate in-house made developments, at the first stages. On the other hand, to design an ion source valid as the first step in an actual LINAC. Since this paper is focused on the control system of ISHP, besides the ion source, all the hardware and its control architecture is presented. Nowadays the ion source is able to generate a pulse of positive ions of Hydrogen from s to a few range with a repetition rate ranging from to with a maximum of of current. Furthermore, the first experiments with White Rabbit (WR) synchronization system are presented.

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Self-mode transition, oscillation and inverse hysteresis in ECR discharges

Ding,

Yang,

2023

AIP Advances

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Positive and negative feedback of microwave (MW) ECR (electron cyclotron resonance) discharges in cross magnetic field were manipulated by a three-stub coaxial tuner. Unstable ECR discharges in the positive feedback region, such as the self-mode transition between the ordinary (O)-wave mode and extraordinary (X) one, inverse hysteresis, and oscillation, were investigated using a time-resolved MW power meter, high speed camera, and thermocouple. In the positive feedback region, the self-O → X wave mode discharge transition can be driven under the “hot” wall condition, while the counterpart, namely the self-X → O wave mode transition, is observable for the “cold” wall; the inverse hysteresis and oscillation take place at low and moderate gas flow rates, respectively. The mechanism underlying the self-mode transitions and instabilities is the discharge shift due to the gas heating effect. For MW ECR discharges to become stable, as indicated in previous experiments, they should be mismatched in the negative feedback region.

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Automated system for efficient microwave power coupling in an S-band ECR ion source driven under different operating conditions

Cited by 6 publications

References 16 publications

Experimental study of pulsed ion beam generated by different pulsing topology in 2.45 GHz ECR proton source

Experimental study of pulsed ion beam generated by different pulsing topology in 2.45 GHz ECR proton source

Adjustable ECR Ion Source Control System: Ion Source Hydrogen Positive Project

Self-mode transition, oscillation and inverse hysteresis in ECR discharges

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