We present a technique to measure permittivity and loss tangent in high-permittivity cylinders. This method utilizes resonator conduct concurrent measurements at the three lowest quasi-TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01<i>p</i></sub> modes across various temperatures, combined with an algorithm fit dependence on frequency temperature. Our serves as preliminary step characterize dielectrics used Hakki-Coleman resonators for...

Abstract A thorough microwave response study of high temperature superconductors, considered as an alternative beam screen coating, has become integral in the design decisions for CERN’s future research infrastructure. Here, we present surface resistance $$R_{s}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>R</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:math> various $$\text {REBa}_{2}\text {Cu}_{3}\text {O}_{7-x}$$...

A synchrotron radiation source emits coherent infrared (IR) when the electron bunch length is comparable to wavelength of emitted (see for example [1, 2]). To generate in far IR (THz) region, a 'low alpha mode' has been devised at ANKA storage ring operating 1.3 GeV. The corresponding lattice significantly reduced momentum compaction factor. spectral dependence recorded ANKA-IR beam line, where light produced fringe field bending magnet [3]. This edge advantage being more collimated than...

Abstract The surface resistance of state-of-the-art REBa 2 Cu 3 O 7− x coated conductors has been measured at 8 GHz versus temperature and magnetic field. We show that the strongly depends on microstructure material. have compared our results to those determined by rigid fluxon model. model gives a very good qualitative description data, opening door unravel effect material vortex interactions high superconductors. Moreover, it provides powerful tool design best conductor architecture...

Abstract To assess the feasibility of using high-temperature superconductors for beam screens future circular colliders, we have undertaken a study power dependence microwave surface resistance in state-of-the-art REBCO coated conductors at about 8 GHz and 50 K. We employed dielectric resonator to produce radio-frequency (RF) electromagnetic fields on having amplitudes similar those generated by proton bunches circulating vacuum chamber proposed collider Hadron-Hadron (FCC-hh) CERN show that...

Abstract The beam screen for the Future Circular hadron-hadron Collider (FCC-hh) has a baseline design based on copper (Cu) coating. Calculations have indicated that resistive wall impedance will be major contributor to FCC-hh at both injection and collision Cu loss might limit ensure stability. To increase safety margin, it is desirable reduce impedance. In this contribution, we present an approach reduction of surface resistance coating by using High-Temperature Superconductors REBaCu 3 O...

Abstract The Future Circular Collider study creates a conceptual design for post-LHC particle accelerator using 16 T superconducting dipoles to achieve collision energies of up 100 TeV in 90 km circumference ring. A copper-coated beam screen, similar that used the LHC, is planned. However, undertaken research indicates copper at high working temperature 50 K has strong influence on accelerator's performance, particularly injection energy. In this work, we relate experimentally determined...

We measured the surface resistance of titanium, amorphous carbon, and nonevaporable getter (NEG) coatings on copper samples, representative treatments beam-facing components in High-Luminosity Large Hadron Collider at CERN. Measurements were done room temperature as well liquid nitrogen (77 K) by means a novel large dielectric resonator operating 3.4 GHz. The impact 100 to 400 nm titanium layer or 50-nm carbon was negligible both down 77 K comparison copper, while thick (1140 nm) NEG showed...

We describe an algorithm capable of extracting the unloaded quality factor and resonant frequency microwave resonators from vector S-parameters. Both symmetrical (Lorentzian) asymmetrical (Fano) transmission responses are supported. The performs adaptive outlier removal to discard measurement points affected by noise or distortion. It removes effects caused imperfections in device (such as modes with close resonance frequencies stray coupling between resonator ports) experimental setup lack...

Abstract The ALBA Synchrotron light source is the Spanish national facility, providing extended research capabilities and a wide range of state-of-the-art instrumentation to academic industrial users European Research Area since 2012. It includes ten operating beamlines, two beamlines in commissioning more construction. JEMCA (Joint Electron Microscopy Center at ALBA), center including advanced electron microscopes, developed collaboration with partner institutions, has recently been...

ALBA will be a third generation synchrotron light facility to built in Cerdanyola near Barcelona (Spain). Commissioning of the storage ring is foreseen start at end 2008. The design phase almost completed and first components are ready ordered. A 100 MeV LINAC inject electrons into nominal energy booster similar circumference as ring, so that both accelerators share same tunnel. working 3 GeV with 268.8 m, has been designed for maximum current 400 mA. lattice based on an extended DBA...

Measuring the electrical surface resistance of 2D materials without contact can provide a method for obtaining their intrinsic characterization. Herein, aim is to show that rutile dielectric resonator (RDR) be used measure conducting coatings deposited on substrates, at resonance frequency. Moreover, it known substrate exerts strong influence capable intrinsically modify properties materials, as found in graphene. The RDR different samples metals (Cu, Mo, Ti, and brass), carbon nanotubes...

The electron storage ring at ANKA is designed as a variation of an eightfold DBA structure. Since its commissioning the facility has been operated with zero dispersion in long straight sections resulting emittance about 100 nmrad. mid 2004 distributed over complete thus reducing to 50 Optics calculations and measurements well operational experience will be discussed. In order reduce losses due Touschek scattering, lengthening bunches was done by modulation main frequency twice synchrotron...

ALBA is a 3rd generation light source under construction close to Barcelona, Spain. The lattice chosen consist in DBA-like structure where most of the vertical focusing takes place bending magnets, order maximize space allocated for insertion devices and reduce emittance. In this case tunes Storage Ring will be strongly affected by magnetic field magnet. existing storage rings with gradient magnets it has been realized that real tune machine slightly different from theoretical one. avoid we...

Storage ring light sources aim for high operational reliability. Very often beam availability is used as an operation metric to measure the A survey of several reveals that calculation varies significantly between facilities. This complicates useful comparisons Furthermore does not provide insight regarding reliability characteristics such orbit and size stability. The authors propose specific metrics evaluate storage sources; these allow a detailed meaningful comparison across Such are...

Electrical and Hall resistivity studies have been carried out on a new class of melt-spun, Al-T-R, Al-rich (above 75 at. %) ternary amorphous alloys in order to study the possible correlation between their electronic enhanced mechanical properties. We find for all these (over 26 them) room-temperature coefficient has negative sign increases significantly magnitude with (T-R) content, which indicates decrease effective carrier concentration. This is consistent suggestion that observed...

ANKA is an electron storage ring working at a nominal energy of 2.5 GeV. The beam injected 500 MeV into the and ramped to final energy. size bunch length have been measured in range from measurements were performed with two synchrotron light monitors, one dispersion region other zero one. was using spectrum Annular Electrode analyser up 8 GHz (1). as function momentum compaction factor, growth rate longitudinal instability current Intrabeam Scattering analysed.

Beam lifetime studies have been performed at the 2.5 GeV electron storage ring ANKA. Measurements under different conditions allow us to differentiate between Touschek, elastic and inelastic beam lifetimes. The measurements are compared with theoretical predictions.

ANKA is a 2.5 GeV synchrotron radiation facility located at Forschungszentrum Karlsruhe (Germany). consists of 500 MeV injector and storage ring. The commissioning the ring started in December 1999. A 100 mA electron beam with minimum lifetime 4 hours was reached July 2000. After introducing gap filling pattern optimising temperature RF cavities current has more than 200 mA, 180 GeV. At same time increased up to 10 hours. Basic parameters like emittance, chromaticity, machine functions among...

Abstract The influence of medium-to-high energy synchrotron radiation (SR) (≈10–100 keV) produced by the ALBA Synchrotron Light Source on state-of-the-art REBCO coated conductors (CCs) has been studied to assess feasibility using high-temperature superconductors for beam screen future circular colliders. Long-term irradiation studies were conducted with ex-situ surface resistance testing a dielectric resonator. In addition, cryogenic test system was established in-situ measurements critical...