Towards precision measurements on highly charged ions using a high harmonic generation frequency comb

Nauta, Janko; Borodin, A. M.; Ledwa, Hans B.; Stark, Julian; Schwarz, Maria A.; Schmöger, Lisa; Micke, P.; López‐Urrutia, J. R. Crespo; Pfeifer, Thomas

doi:10.1016/j.nimb.2017.04.077

Cited by 19 publications

(12 citation statements)

References 20 publications

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“…spectroscopy on HCIs as it is routinely performed with atoms and singly charged ions, and the application of the most sensitive techniques for detection, like quantum logic spectroscopy 125 , aiming at resolving the natural linewidth of forbidden optical transitions, or direct frequency-comb spectroscopy from the optical to the extreme ultra-violet (XUV) range 126 . Furthermore, extraction and subsequent detection of ions can be used to determine the charge-state distribution in the trap and has been used to investigate resonant photoionization by synchrotron radiation 107,108,111 .…”

Section: Introductionmentioning

confidence: 99%

The Heidelberg compact electron beam ion traps

Micke

Kühn

Buchauer

et al. 2018

Review of Scientific Instruments

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Electron beam ion traps (EBITs) are ideal tools for both production and study of highly charged ions (HCIs). 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 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, achieving an electron-energy resolving power of E/ΔE > 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 the resonant photoexcitation of highly charged oxygen.

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Section: Introductionmentioning

confidence: 99%

The Heidelberg compact electron beam ion traps

Micke

Kühn

Buchauer

et al. 2018

Review of Scientific Instruments

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“…Using the recently established techniques for trapping, 63 cooling, 37,63 and subsequent interrogation of HCI by QLS, 37 this new apparatus, in combination with the XUV frequency comb, [48][49][50] promises the implementation of XUV frequency metrology based on HCI.…”

Section: Discussionmentioning

confidence: 99%

“…Since we aim for direct frequency comb spectroscopy of HCI in the extreme ultraviolet (XUV) range, a dedicated XUV frequency comb based on highharmonic-generation inside an optical enhancement cavity has been set up and commissioned at MPIK. [48][49][50]…”

Section: Introductionmentioning

confidence: 99%

An ultralow-noise superconducting radio-frequency ion trap for frequency metrology with highly charged ions

Stark,

Warnecke,

Bogen

et al. 2021

Preprint

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We present a novel ultrastable superconducting radio-frequency (RF) ion trap realized as a combination of an RF cavity and a linear Paul trap. Its RF quadrupole mode at 34.52 MHz reaches a quality factor of Q ≈ 2.3×10 5 at a temperature of 4.1 K and is used to radially confine ions in an ultralow-noise pseudopotential. This concept is expected to strongly suppress motional heating rates and related frequency shifts which limit the ultimate accuracy achieved in advanced ion traps for frequency metrology. Running with its low-vibration cryogenic cooling system, electron beam ion trap and deceleration beamline supplying highly charged ions (HCI), the superconducting trap offers ideal conditions for optical frequency metrology with ionic species. We report its proof-of-principle operation as a quadrupole mass filter with HCI, and trapping of Doppler-cooled 9 Be + Coulomb crystals.

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“…Highly charged ions (HCIs) can be produced, e.g., in an electron-beam ion trap (EBIT) [23] and then be moved to a cryogenic Paul trap [24][25][26] for interactions with external lasers [26][27][28]. Due to the existence of environmentinsensitive forbidden optical transitions, HCIs are of great interest in frequency metrology and for tests of fundamental physics [29,30] such as testing the hypothesis of fine-structure-constant variation [31][32][33][34] and for constraining the strength of a possible fifth force acting between electrons and nucleons [35,36].…”

mentioning

confidence: 99%

“…Bloch equations.-We provide quantum dynamical simulations of the excitations of Ar 6þ ions coupled to an EUV pulse train. The duration of each pulse is assumed to be 200 fs with a repetition time of T r ¼ 10 ns [27], corresponding to a FWHM bandwidth of 2.19 THz and repetition rate of 100 MHz. The carrier frequency ω 0 is tuned to the 3 P 1 → 1 S 0 transition.…”

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confidence: 99%

Interrogating the Temporal Coherence of EUV Frequency Combs with Highly Charged Ions

et al. 2020

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A scheme to infer the temporal coherence of EUV frequency combs generated from intracavity highorder harmonic generation is put forward. The excitation dynamics of highly charged Mg-like ions, which interact with EUV pulse trains featuring different carrier-envelope-phase fluctuations, are simulated. While demonstrating the microscopic origin of the macroscopic equivalence between excitations induced by pulse trains and continuous-wave lasers, we show that the coherence time of the pulse train can be determined from the spectrum of the excitations. The scheme will provide a verification of the comb temporal coherence at timescales several orders of magnitude longer than current state of the art, and at the same time will enable high-precision spectroscopy of EUV transitions with a relative accuracy up to δω=ω ∼ 10 −17 .

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Towards precision measurements on highly charged ions using a high harmonic generation frequency comb

Cited by 19 publications

References 20 publications

The Heidelberg compact electron beam ion traps

The Heidelberg compact electron beam ion traps

An ultralow-noise superconducting radio-frequency ion trap for frequency metrology with highly charged ions

Interrogating the Temporal Coherence of EUV Frequency Combs with Highly Charged Ions

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