Performance of first high temperature superconducting ECRIS

Kanjilal, D.; Rodrigues, G.; Kumar, Pravin; Mandal, A.; Roy, A.; Bieth, C.; Kantas, S.; Sortais, P.

doi:10.1063/1.2164887

Cited by 22 publications

(5 citation statements)

References 7 publications

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“…For the sake of completeness and usefulness of such plasma studies at higher rf power levels in large volume ECR sources, the instabilities have also been observed experimentally by the same Fourier analysis technique for a high temperature superconducting ECR ion source also known as PKDELIS [41,42] and it has been observed that there is a similar set of plasma instabilities. The source has an axial field of 1.8 T and 1.5 T at the injection and extraction side, respectively.…”

Section: Plasma Instabilities At Higher Rf Power and Confinement Fmentioning

confidence: 99%

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

Kumar

Sharma

et al. 2018

Phys. Rev. Accel. Beams

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The plasma instabilities play an important role in an electron cyclotron resonance (ECR) ion source for the production of intense heavy ion beams in high charge states for particle accelerators. The geometrical and operational constraints of ECR sources hinder the trapping of ions for a sufficient time to get fully ionized with maximum efficiency. This problem is looked at in detail by studying the plasma instabilities in ECR ion sources. The ECR environment is full of complex rearrangements of various electric and magnetic fields to define a sustainable trap for the ions. The maximum frequency of plasma instability has been observed to be of 122.5 kHz under a set of sustainable plasma parameters. However, this limit may be pushed further if the plasma is overdriven in terms of source parameters. The instabilities cover a full regime of few tens of Hz to few hundreds of kHz under various operating conditions of radio frequency (rf), negative bias voltage, rf power and injection gas pressure. The rigorous details of frequencies and amplitudes of plasma instabilities are being reported by studying the Fourier spectrum of extracted and analyzed beam intensity. The plasma instabilities are attributed as drift waves in an inhomogeneous ECR plasma generated by the application of radio-frequency fields.

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Section: Plasma Instabilities At Higher Rf Power and Confinement Fmentioning

confidence: 99%

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

Kumar

Sharma

et al. 2018

Phys. Rev. Accel. Beams

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“…Various methods namely a very tight ion-electron confinement system using higher radial and axial magnetic fields, the use of high power and frequency transmitter, simultaneous injection of two frequencies and the use of dielectric coating on the wall of plasma chamber were employed to enhance the intensity of highly charged ions [8,9]. Plasma confinement system was further improved using superconducting coils [10]. With frozen design, certain ion source operational techniques are also used to increase the intensity of highly charged ions.…”

Section: Introductionmentioning

confidence: 99%

Studies of xenon ECR plasma: search for a better understanding of the gas-mixing and anomalous effects

Kumar¹,

Mal²,

Kanjilal³

2014

Plasma Sources Sci. Technol.

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Pure and oxygen-mixed xenon plasmas were produced using 10 GHz all-permanent-magnet electron cyclotron resonance (ECR) ion source. The charge state distributions (CSDs) of highly abundant isotopes ( 129 Xe, 131 Xe and 132 Xe) were studied by extracting the ions from the plasma and analyzed them in mass and energy using a large acceptance analyzer-switching dipole magnet. In earlier studies (Drentje 1992 Rev. Sci. Instrum. 63 2875, Kawai et al 2001 Plasma Sources Sci. Technol. 10 451), the CSD of oxygen and nitrogen ECR plasmas showed that isotopic intensity ratio of ions varies with the charge state (anomalous effect). The anomalous effect in the pure and oxygen-mixed xenon ECR plasma was absent up to +13 charge state. With oxygen, a very small positive gas-mixing effect on the charge state beyond +8 was observed. In this paper, we present CSDs of xenon isotopes with and without oxygen mixing (at optimized ion source parameters) and compare the intensity of isotopes for various charge states to shed light on the previously noticed anomalous effect in the ECR plasma.

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“…The test setup for the HTS ECR ion source, PKDELIS, 6,7 and associated low energy beam transport section is presently in operation and the results of recent performance of the source can be found in Ref. 8.…”

Section: Methodsmentioning

confidence: 99%

Studies of emittance of multiply charged ions extracted from high temperature superconducting electron cyclotron resonance ion source, PKDELIS

Rodrigues

Lakshmy

Kumar

et al. 2010

Review of Scientific Instruments

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For the high current injector project at Inter University Accelerator Centre, a high temperature superconducting electron cyclotron resonance (ECR) ion source, PKDELIS, would provide the high charge state ions. The emittance of the ECR ion source is an important parameter to design further beam transport system and to match the acceptances of the downstream radio frequency quadrupole and drift tube linac accelerators of the high current injector. The emittance of the analyzed beam of PKDELIS ECR source has been measured utilizing the three beam size technique. A slit and two beam profile monitors positioned at fixed distances from each other were used to measure the beam size. The digitized beam profiles have been analyzed to determine the emittance of various multiply charged ions. The variation of emittance with gas mixing, ultrahigh frequency power, and extraction energy are discussed in this presentation.

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Performance of first high temperature superconducting ECRIS

Cited by 22 publications

References 7 publications

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

Studies of xenon ECR plasma: search for a better understanding of the gas-mixing and anomalous effects

Studies of emittance of multiply charged ions extracted from high temperature superconducting electron cyclotron resonance ion source, PKDELIS

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