Beam Dynamics Simulation and Measurements for the IFMIF/EVEDA Project

Comunian, M.; Antoniazzi, L.; Baldo, Andrea; Baltador, C.; Bellan, Luca; Bortolato, D.; Cavenago, M.; Chauvin, Nicolas; Dzitko, Hervé; Fagotti, E.; Giacchini, M.; Grespan, Francesco; Montis, Maurizio; Palmieri, Antonio; Pisent, A.; Scantamburlo, Francesco

doi:10.18429/jacow-hb2018-wep1wb02

Cited by 1 publication

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“…A goal of 𝑡 𝑝 = 3600 s is set for giant fusion sources, while 𝑡 𝑝 2 × 10 4 s (about one working day) was repeatedly achieved in NIO1. A fusion plant will require a 20 year operation (or more), that is a BOT of 𝑡 𝑏 6 × 10 8 s, while an ambitious practical goal for a compact test source is an integrated beam time per year about 2 × 10 6 s. Even with this large scaling factor, a compact test installation can give useful experience on beam scattering damages, ion back-streaming, while material fatigue is actively studied in the so-called broader approach [5]. On the other end of time scales, we have the 20 ms period of the 50 Hz power supply and beam ripple (with harmonics) contributing to fatigue, the typical pulse length (in the order of one minute), and the observed evolution of transients in NIO1 (ten minutes).…”

Section: Introductionmentioning

confidence: 99%

Volume and surface effects in Cs-free regimes in NIO1

Cavenago,

Barbisan,

Delogu

et al. 2023

J. Inst.

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NIO1 (Negative Ion Optimization phase 1) is a compact multiaperture radiofrequency H- ion source whose design was optimized for sustainable prolonged beam on target operation; for installation economy, its size was drastically reduced with respect to fusion device D- sources, down to a plasma volume of 1.6 × 10-3 m-3. Even if Cesium improves H- production as well known, also Cs-free regimes (and intermediate regimes) well deserve some development effort, in view of avoiding long term contamination of the accelerator and for use as cleaning procedure. Data collected by NIO1 in a true Cs-free regime (before 2020) are thus very important, and need a thorough statistical analysis, with special attention to the technique of gas conditioning that was discovered in NIO1 and to the issues concerned with long term operation; N2, Ar, and Xe comparison to oxygen is here shown; all these gases proved useful for conditioning, to different extents. Gas conditioning macroscopically proves the importance of surface effects, even when the final production of H- happens in the source volume. As regards to the Electron Cyclotron Resonance Ion Sources (ECRIS), exchange of ideas and concepts, such as electron economy and biased disks, liners and wall coatings, is considered. Gas mixing, conditioning and surface material perspectives are envisioned.

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Section: Introductionmentioning

confidence: 99%