High Frequency Ion

HAARP, the most powerful ionosphere heater on Earth

Its density is controlled by the relative rates of ion production and the recombination of ions with electrons to re-create neutral molecules. The ionosphere begins at an altitude of about 70 km, reaches a peak daytime density of something like a million particles per cubic centimeter near 250 km, and tapers off above that altitude to blend ...

Ion energy uniformity in high-frequency capacitive discharges

Ion energy distribution functions and ion fluxes in low-pressure, high-frequency (13.56-80 MHz) capacitive discharges were investigated both theoretically and experimentally. In most of the conditions explored, the ion energy distribution function was a single peak centered at the time-averaged plasma potential.

High-frequency B-dot probes used to detect characteristics of ion …

The plasma in the scrape-off layer (SOL) has an important effect on the coupling of the waves in the ion cyclotron range of frequencies (ICRF). The high-frequency B-dot (HFB) probes have been installed to investigate the behaviour of ICRF waves on EAST. The fast and slow ICRF wave field amplitudes are measured and a domain parallel wavenumber is …

Desensitization of neurotransmitter-gated ion channels during high …

Desensitization of neurotransmitter-gated ion channels during high-frequency stimulation: a comparative study of Cys-loop, AMPA and purinergic receptors J Physiol. 2011 Apr 1;589 (Pt 7):1571 ... To better define the response of the different neurotransmitter-gated ion channels (NGICs) to repetitive stimulation without interference from ...

Chapter 18 Radio Frequency-Driven, Pulsed High …

Chapter 18 Radio Frequency-Driven, Pulsed High-Current H− Ion Sources on Advanced Accelerators Martin P. Stockli Abstract The introduction of this chapter explains the use of pulsed high-current H− ion sources. It then discusses the radio frequency-driven H− ion sources serving advanced accelerators starting with the award-winning SNS ion source.

The 6 Best High Frequency Skincare Wands in 2024

High-frequency wands deliver gentle, nonintrusive electrical currents, creating ozone, which kills acne-causing bacteria and firms the skin. "The main source of energy in high-frequency wands and ...

Low-temperature-sintering of Co2Z ferrite materials via Dy3+ ion …

According to this study, Co 2 Z ferrite is suitable for applications in high-frequency antennas. Ba 3 Co 2 Fe 24-x Dy x O 41 samples with different values of Dy 3+ doping concentration (x) in the range of 0.00–0.25 were prepared in the study by employing solid-state sintering and 2.5 wt% Bi 2 O 3 sintering aids. A systematic analysis of the physical phase …

Broadband linear high-voltage amplifier for radio frequency ion …

We developed a linear high-voltage amplifier for small capacitive loads consisting of a high-voltage power supply and a transistor amplifier. With this cost-effective circuit including only standard parts sinusoidal signals with a few volts can be amplified to 1.7 kV pp over a usable frequency range at large-signal response spanning four orders of magnitude from 20 Hz to …

Observation of high-frequency ion instabilities in a cross …

A temporal correlation was found between the low-frequency ionization process and the high frequency ion instability. The high-frequency spectral properties of the ion mean velocity are compared ...

High frequency impedance characteristics of cylindrical …

High frequency (HF) properties of lithium-ion (Li-ion) batteries receive growing attention, as an increasing number of highly dynamic loads are present in today's hybrid or …

Review of high intensity ion source development and …

Cost and complexity may limit the push of ECR ion sources to high frequency beyond 60 GHz and clearly is a limitation for the choice of sources for presently envisioned projects. However, there are many other avenues ("tricks") to pursue even for these sources. Continued development on the performance of other types of sources (cessiated ...

New progress of a 2.45 GHz ECR ion source for carbon positive ion …

At present, in order to generate C q+ (q ≥ 2) ions, the above-mentioned laboratories use a high-frequency ECR ion source. In fact, low-frequency 2.45 GHz ECR ion sources also have the potential to generate multi-charged ions, as shown in Table 1.Since the 1990s, several laboratories have begun the research of multi-charged 2.45 GHz ECR ion sources, but they …

Ion energy uniformity in high-frequency capacitive discharges

Ion energy distribution functions and ion fluxes in low-pressure, high-frequency (13.56 – 80 MHz) capacitive discharges were investigated both theoretically and experimentally. In most of the conditions explored, the ion energy distribution function was a single peak centered at the time-averaged plasma potential.

High-Frequency Properties of Y-Ba-Cu-O Josephson …

We have fabricated spiral THz antennas containing embedded high TCYBa2Cu3O7 (YBCO) focused helium ion beam Josephson junctions (JJ) for characterization of their high frequency characteristics. The values of the resistance and critical current of the junctions are controlled through the irradiation dose and geometry of the junction. We observe …

High-frequency phenomena and electrochemical impedance …

Ultra-high salinity and high induced ion concentrations. ... Recently, a powerful and versatile approach for high-frequency measurements at nanoelectrodes has been introduced that takes advantage of state-of-the-art radio frequency (RF) instrumentation [60]. In this first …

High frequency impedance of Li-ion batteries | Semantic …

High frequency impedance of Li-ion batteries @article{Doersam2015HighFI, title={High frequency impedance of Li-ion batteries}, author={Thomas Doersam and S. Schoerle and Carsten Spieker and Thomas Waldmann and Eckart Hoene and Klaus-D. Lang}, journal={2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)}, …

HIGH-FREQUENCY ION SOURCE (Journal Article) | OSTI.GOV

The high-frequency ion source, with transverse high frequency and longitudinal resonance'' magnetic field, produces a 300 to 350 mu a current at targets placed 2.7 m from the source with a gas rate ~ 1 cm/sup 3//hr. The gas utilization factor is < 0.3. The performance of the source was tested with low voltage (~ 100 kv).

RF Ion Sources

abs decreases at high frequency Collisions necessary ν > 0. W. Kraus 1. June 2012 CERN Accelerator School – Ion Sources 7 Skin effect ... RF frequency >> ion plasma frequency ⇒Ions cannot follow the RF field ⇒Low ion energy of some 10 eV Transition region 5 – 10 MHz. W. Kraus 1. June 2012 CERN Accelerator School – Ion Sources 13

Electromagnetic Spectrum – The Physics Hypertextbook

High-energy particles that fall on the Earth from space. Primary cosmic rays consist of nuclei of the most abundant elements, with protons (hydrogen nuclei) forming by far the highest proportion; electrons, positrons, neutrinos, and gamma ray photons are also present.

High‐Performance Internal Ion‐Gated Organic …

High-Performance Internal Ion-Gated Organic Electrochemical Transistors for High-Frequency Bioimpedance Analysis. Sin Yu Yeung, ... This study also successfully demonstrates the first use of electrochemical …

A Comprehensive Time-domain-based Optimization of a High-Frequency …

A Comprehensive Time-domain-based Optimization of a High-Frequency LLC-based Li-ion Battery Charger Abstract: The LLC resonant converter, as a promising solution for battery charger applications, has the ability to adjust its output voltage during Constant Current and Constant Voltage modes in the charging profile. However, its operation mode ...

Low power high-performance radio frequency oscillator for driving ion

We report a simple, efficient, high voltage radio frequency (RF) generator powered by a single voltage source (1.5–7 V) to resonantly drive ion traps or other c ... Low power high-performance radio frequency oscillator for driving ion traps Y.-Y. Jau; Y.-Y. Jau a) Sandia National Laboratories ...

Macroscopic conductivity of aqueous electrolyte solutions

The magnitude of these high-frequency ionic motions scales linearly with conductivity for a wide range of ions and concentrations. This scaling is rationalized within a harmonic oscillator model ...

Comparing low frequency (100 kHz) plasma systems to higher frequency

The "high" (13.6 MHz) frequency excitation gives a narrow range of ion energies as the ions experience the average of many RF cycles during their transit of the sheath. Figure-6. Calculated ion energy distribution function (number of ions vs. ion energy) for argon at "high" and "low" frequencies; data from Dry Etching for VLSI, van ...

High-frequency and intrinsically stretchable polymer diodes

d, Chemical structures of the stretchable electronic materials used in the stretchable high-frequency diode. ION B, 4-(3-butyl-1-imidazolio)-1-butanesulfonate; LITFSI, Lithium Bis ...

High‐Performance Internal Ion‐Gated Organic …

High-Performance Internal Ion-Gated Organic Electrochemical Transistors for High-Frequency Bioimpedance Analysis. Sin Yu Yeung, ... This study also successfully demonstrates the first use of electrochemical transistors like IGTs in high-frequency applications through proof-of-concept experiments simulating fluid estimation in 50 kHz ...

High frequency and low voltage plasma immersion ion …

Fig.1 is the schematic drawing of high frequency and low voltage plasma ion immersion implantation (HLPIII) and nitriding equipments used in the experiment. Prior to the implantation, the base pressure of the chamber was 2.5 × 10 − 3 Pa. The working gas (50 sccm N 2) was inlet into the chamber from the top and the working gas pressure is 5 × 10 − 1 Pa. N 2 …

High frequency Alfvén eigenmodes detected with ion

Demonstration of high frequency Alfvén eigenmodes in the presence of RF-accelerated fast ions via the third beam ion cyclotron harmonic resonance (3Ω D) in a discharge with a reduced (and constant) magnetic field B o = −2.0 T. The ICRF power is …

A compact radio-frequency ion source for high brightness …

A high brightness and low energy spread (∆E) ion source is essential to the production of a high-quality primary ion beam applied in secondary ion mass spectrometry …

Ionospheric modifications in high frequency heating …

Ionospheric heating and modification by powerful high-frequency (HF) waves transmitted from the ground has been a very active research area over the past four decades. 1–3 It is a platform for experimental and theoretical investigation of wave-wave and wave-particle interactions in magnetized plasma. Considerable advancement toward the understanding of …