Pure oxygen-free high-conductivity copper is a widely used material for manufacturing accelerating cavities working at room temperature. Several studies attempted to explain limitations associated with the maximum allowed field gradients and the behaviour of vacuum RF breakdown in copper accelerating structures through …

The high gradient magnetic separator (HGMS) is a strong magnetic separator for the screening of weakly magnetic minerals.It is a new type of strong magnetic separator developed on the basis of a general magnetic separator machine. The high gradient magnetic separator equipment is suitable for: Separation of weak magnetic …

When visualization of the leaflets is difficult and high gradients are obtained, a thorough search for prosthesis dysfunction must occur if grave perioperative morbidity is to be avoided. Three-dimensional (3D) ... as a new, more accurate index of AS. They used an experimental model of native AV and bioprosthetic valves to calculate the energy ...

Abstract. Onsite surveys and 75 measurements of discharge were made on 21 high‐gradient streams (slopes greater than 0.002) for the purpose of computing the Manning roughness coefficient, n, and to provide data on the hydraulics of these streams. These data show that: (1) n varies inversely with depth; (2) n varies directly with slope; …

After the successful testing of a short prototype, 354 mm in length, of a new high-gradient (HG) section that sustained an accelerating gradient of 40 MV/m with a breakdown rate (BDR) of 8 × 1 0 − 8 bpp, two 3.0 m HG structures with the same design were built and installed at the FERMI linac. We report here the recent experience on the ...

Gradient elution demystified Of the various ways in which chromatography is applied today, few have been as misunderstood as the technique of gradient elution, which presents many challenges compared to isocratic separation. When properly explained, however, gradient elution can be less difficult to understand and much easier to use …

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high-gradient performance and consequent validation of the fabrication technology. For this test, a structure called T24_THU_#1 was chosen for the initial study on high-gradient research [12]. The nomenclature "T24" refers to a standardized CLIC high-gradient test structure design. The T24 design has the same number of cells (i.e., 24), iris

During the high-power experiment, an accelerating gradient of 18.7 MeV/m was achieved, and the kinetic energy was measured to be 6.1 MeV. The HOM signal was extracted and analyzed.

Research in ultrahigh magnetic field strength combined with ultrahigh and ultrafast gradient technology has provided enormous gains in sensitivity, resolution, and contrast for neuroimaging. This article provides an overview of the technical advantages and challenges of performing clinical neuroimaging studies at ultrahigh magnetic field …

We are pleased to announce the 14th workshop on breakdown science and high gradient technology, HG2022, will be held virtually on Zoom from May 16-19, 2022. …

High-gradient superconducting RF (SRF) cavities are needed for energy frontier superconducting accelerators. Progress has been made over the past decades …

Novel acceleration concepts driven by laser fields, wakefields and terahertz fields have demonstrated their effectiveness at generating stronger fields (greater than …

We are pleased to (re)announce the 13th workshop on breakdown science and high gradient accelerator technology*, HG2021, will be held virtually on Zoom from April 19-21, 2021. Clearly the identification and advancement of high gradient accelerator technologies for a linear collider have been the main goal since the inception of the High …

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A new local field quantity is presented which gives the high gradient performance limit of accelerating structures due to vacuum rf breakdown. The new field quantity, a modified Poynting vector Sc, is derived from a model of the breakdown trigger in which field emission currents from potential breakdown sites cause local pulsed heating. …

New technology based on clamping for high gradient radio frequency photogun. High gradient rf photoguns have been a key development to enable several applications of high quality electron beams. They allow the generation of beams with very high peak current and low transverse emittance, satisfying the tight demands for free-electron lasers ...

High gradient rf photoguns have been a key development to enable several applications of high quality electron beams. They allow the generation of beams with very high peak current and low transverse emittance, satisfying the tight demands for free-electron lasers, energy recovery linacs, Compton/Thomson sources and high-energy …

Learn about a new local field quantity that describes the high gradient limit of accelerating structures in this physics paper.

Abstract. Extensive laboratory and commercial test works have been done on Pulsating High Gradient Magnetic Separation (PHGMS) and it is demonstrated that it is an efficient method to treat weakly magnetic minerals. To investigate the PHGMS principle, a cyclic pulsating high gradient magnetic separator was built for laboratory test work.

the high gradient studies for ILC with new re-entrant cav-ities made of Þne-grain as well as large-grain niobium. These new cavities have smaller apertures of 60 mm, pro-viding a further reduced H pk /E acc or a further improved ultimate gradient. Four 1300 MHz 60 mm aperture re-entrant cavities are made, two out of Þne grain niobium

The acquisition parameters accessible using the new gradient system will be systematically evaluated against the current range of gradient strengths and diffusion times to achieve an optimal combination of high spatial resolution and high diffusion sensitivity for pushing the envelope on defining mesoscopic (e.g., cortico-cortical connections ...

High gradient magnetic separation technology is a green production technology that has an unparalleled superiority in separating fine and weak magnetic …

The HIBI is widely applicable to high gradient streams in New Jersey less than 10.4 km 2 in drainage size. Streams with drainage areas less than 1.29 km 2 or reach gradients greater than 7% have a greater chance of being fishless. All streams were sampled when holding water; however, fish were not caught at 3 of the 96 sites in our …

To apply the new technology of PHGMS in industry, the SLon-1000, SLon-1500, SLon-2000 vertical ring and pulsating high gradient magnetic separators have been developed, which possess the ...

High-gradient superconducting RF (SRF) cavities are needed for energy frontier superconducting accelerators. Progress has been made over the past decades and the accelerating gradient E acc has been increased from a few MV/m to ∼42 MV/m in SRF niobium cavities. The corresponding peak RF magnetic field H pk on the niobium cavity …

The new procedure worked with different gradients, flow rates, column lengths, inner diameters, on two different HPLCs, and with six different batches of the standard stationary phase. Keywords: Liquid chromatography–mass spectrometry; Measure HPLC Gradient; Retention prediction; Retention projection; Retention time calculation; …

A new fabrication technique based on clamping has been recently developed and used for the construction of a high gradient S-band photocathode RF gun by INFN-LNF, Italy.

The availability of dedicated high-performance gradient coils with large maximum gradient amplitudes enables new classes of diffusion MRI measurements to be performed in the living human brain and provides a more sensitive probe of white matter microstructure in various neurological diseases. High gradient amplitudes benefit the …

The capture of magnetic nanoclusters in high-gradient magnetic separation (HGMS) operations, the rate-limiting step in magnetic nanoparticle-based separations and chemical processing, was studied experimentally, and a new model for HGMS capture that extends current single-wire models to column behavior was developed. Clusters >50 nm …