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| TUA1 |
Design of a new iron plug for the TRIUMF ECRIS charge state booster |
injection, plasma, booster, ECR |
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- J.A. Adegun, F. Ames, O.K. Kester
TRIUMF, Vancouver, Canada
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Funding: Natural Sciences and Engineering Research Council of Canada (NSERC) and TRIUMF
This paper presents an innovative solution to address the issue of asymmetric dipole fields in the injection region of the TRIUMF electron cyclotron resonance ion source charge state booster. The asymmetric fields arise from a wide gap in the booster’s injection soft iron plug, which allows the connection of the RF waveguide to the plasma chamber. Simulations have revealed that singly charged ions, injected for charge breeding, experience deflection and get lost due to the asymmetric magnetic fields instead of being effectively captured by the plasma, thereby diminishing the efficiency of the charge state booster. To rectify this problem, a novel iron plug with an enlarged inner diameter, which allows the RF waveguide to connect to the plasma chamber with no gap was designed. Furthermore, this new design necessitates alterations to the injection electrodes and plasma chamber of the booster. Additionally, the waveguide and gas-inlet windows were repositioned to ensure better RF coupling into the plasma cavity. By eliminating the gap and implementing these design changes, it is anticipated that the TRIUMF charge state booster will operate at the same overall efficiency as other PHOENIX boosters.
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Slides TUA1 [5.636 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-ECRIS2024-TUA1
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| About • |
Received ※ 17 September 2024 — Revised ※ 07 October 2024 — Accepted ※ 29 May 2025 — Issued ※ 23 June 2025 |
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| THA3 |
Waveguide DC breaks with optimized impedance matching networks |
ion-source, impedance, simulation, network |
162 |
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- M.K. Covo, B. Ninemire, D.S. Todd, D.Z. Xie, J. Cruz Duran, J.Y. Benitez, J.P. Garcia, L. Phair, M.B. Johnson, P. Bloemhard
LBNL, Berkeley, CA, USA
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A custom 18 GHz waveguide DC break with a built-in impedance matching network, consisting of two inductive irises adjacent to a capacitive gap assembled around a quartz disk, was built for VENUS and simulated using the ANSYS High Frequency Structure Simulator, a finite element analysis tool. The DC break effectively doubled the RF power available for plasma production at the secondary frequency of 18 GHz while maintaining a DC isolation of 32 kV. Measurements of the forward and reflected power coefficients, performed with a network analyzer, showed excellent agreement with the simulations [1]. Additionally, an extended study was conducted to tailor the frequencies of 28, 35, and 45 GHz using WR-34, WR-28, and WR-22 waveguides with built-in impedance matching networks, aiming to predict performance for our upcoming 4th generation low-power, multi-frequency operation of the MARS-D ion source.
[1] M. Kireeff Covo et al., “Inductive Iris Impedance Matching Network for a Compact Waveguide DC Break”, IEEE Transactions on Microwave Theory and Techniques, early access 2024. doi:10.1109/TMTT.2024.3409470.
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Slides THA3 [1.702 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-ECRIS2024-THA3
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| About • |
Received ※ 13 September 2024 — Revised ※ 09 October 2024 — Accepted ※ 30 January 2025 — Issued ※ 18 May 2025 |
| Cite • |
reference for this paper using
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※ LaTeX,
※ Text/Word,
※ RIS,
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