The Heidelberg compact electron beam ion traps

Abstract

Electron beam ion traps (EBIT) are ideal tools for both production and study of highly charged ions (HCI). In order to reduce their construction, maintenance, and operation costs we have developed a novel, compact, room-temperature design, the Heidelberg Compact EBIT (HC-EBIT). Four already commissioned devices operate at the strongest fields (up to 0.86 T) reported for such EBITs using permanent magnets, run electron beam currents up to 80 mA and energies up to 10 keV. They demonstrate HCI production, trapping, and extraction of pulsed Ar${}^{16+}$ bunches and continuous 100 pA ion beams of highly charged Xe up to charge state 29+, already with a 4 mA, 2 keV electron beam. Moreover, HC-EBITs offer large solid-angle ports and thus high photon count rates, e. g., in x-ray spectroscopy of dielectronic recombination in HCIs up to Fe${}^{24+}$, achieving an electron-energy resolving power of $E/\Delta E>1500$ at 5 keV. Besides traditional on-axis electron guns, we have also implemented a novel off-axis gun for laser, synchrotron, and free-electron laser applications, offering clear optical access along the trap axis. We report on its first operation at a synchrotron radiation facility demonstrating resonant photoexcitation of highly charged oxygen.

20 pages, 18 figures, 1 table

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• New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem
• Perspectives on testing fundamental physics with highly charged ions in Penning traps
• Revisiting the Fe XVII line emission problem: laboratory measurements of the 3s-2p and 3d-2p line-formation channels
• Algorithmic Ground-state Cooling of Weakly-Coupled Oscillators using Quantum Logic
• High-Precision Determination of Oxygen-K$\alpha$ Transition Energy Excludes Incongruent Motion of Interstellar Oxygen
• Quadruply Ionized Barium as a Candidate for a High-Accuracy Optical Clock
• Observation of strong two-electron--one-photon transitions in few-electron ion
• Production of highly charged ions of rare species by laser-induced desorption inside an electron beam ion trap
• A low-energy compact Shanghai-Wuhan electron beam ion trap for extraction of highly charged ions
• Interrogating the temporal coherence of EUV frequency combs with highly charged ions
• Comprehensive Laboratory Measurements Resolving the LMM Dielectronic Recombination Satellite Lines in Ne-like Fe XVII Ions
• High-precision mass measurement of doubly magic ${}^{208}$Pb
• High-Precision Transition Energy Measurements of Neon-like Fe XVII Ions
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• Towards metrology with highly charged isomeric ions from antiproton annihilation
• Parts-per-million-accurate determination of the K$\alpha$ photoionization resonance of Be-like oxygen with resolution of its ${}^{16}$O-${}^{18}$O isotopic shift