A5076012026- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Power Line Communications and Noise
- Plasma Diagnostics and Applications
- Energy Harvesting in Wireless Networks
- Quantum and electron transport phenomena
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Quantum Information and Cryptography
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Microwave Engineering and Waveguides
- Atomic and Subatomic Physics Research
- Superconducting and THz Device Technology
- Spectroscopy and Laser Applications
- Radio Frequency Integrated Circuit Design
- HVDC Systems and Fault Protection
- Advancements in PLL and VCO Technologies
- Optical and Acousto-Optic Technologies
- Vacuum and Plasma Arcs
- Fluid dynamics and aerodynamics studies
- Near-Field Optical Microscopy
Fermi National Accelerator Laboratory
2015-2024
Fermi Research Alliance
2015
Institute for High Energy Physics
1999
Even though silicon is widely used in superconducting quantum processors as the substrate upon which qubits are fabricated, effect of on performance not fully understood. Using ultrahigh-quality microwave cavities to measure dielectric loss with parts-per-billion precision, authors clearly show that using detrimental qubit coherence time. The tangent found here an order magnitude worse than previously measured. This study sheds light physical mechanisms behind dissipation silicon, and...
This is a Snowmass white paper on the utility of existing and future superconducting cavities to probe fundamental physics. Superconducting radio frequency (SRF) cavity technology has seen tremendous progress in past decades, as tool for accelerator science. With advances spear-headed by SQMS center at Fermilab, they are now being brought quantum regime becoming science thanks high degree coherence. The same quality factor can be leveraged search new physics, including searches particles,...
Analytical solutions are derived for both transient and steady state gradient distributions in the traveling wave (TW) accelerating structures with arbitrary variation of parameters over structure length. The results unloaded beam loaded cases presented. Finally, exact analytical shape rf pulse waveform was found order to apply loading compensation scheme during filling time. obtained theoretical formulas were cross-checked by direct numerical simulations on CLIC main linac demonstrated a...
The Compact Linear Collider (CLIC) requires beam position monitors (BPMs) with 50 nm spatial resolution for alignment of the line elements in main linac and delivery system. Furthermore, BPMs must be able to make multiple independent measurements within a single 156 ns long bunch train. A prototype cavity BPM CLIC has been manufactured tested on probe at 3rd Test Facility (CTF3) CERN. transverse is determined from electromagnetic resonant modes excited by two cavities pickup, reference...
In frame of the development a high resolution BPM system for CLIC Main Linac we present design cavity prototype. It consists waveguide loaded dipole mode resonator and monopole reference cavity, both operating at 15 GHz, to be compatible with bunch frequencies Test Facility. Requirements, concept, numerical analysis, practical considerations are discussed.
Abstract This paper reports the design of a 2815 MHz Quasi-waveguide Multicell Resonator (called QMiR) being considered as transverse RF deflecting cavity for Advanced Photon Source's (APS) Short Pulse X-ray project. QMiR forms trapped dipole mode inside beam vacuum chamber, while High Order Modes (HOM) are heavily loaded. results in sparse HOM spectrum, makes couplers unnecessary and allows simplifying mechanical design. The form electrodes is optimized producing 2 MV voltage keeping low...
Superconducting linacs are capable of producing intense, stable, high-quality electron beams that have found widespread applications in science and industry. The 9-cell, 1.3-GHz superconducting standing-wave accelerating rf cavity originally developed for ${e}^{+}/{e}^{\ensuremath{-}}$ linear-collider [B. Aunes, et al. Phys. Rev. ST Accel. Beams 3, 092001 (2000)] has been broadly employed various superconducting-linac designs. In this paper we discuss the transfer matrix such a present its...
Main and HOM couplers break the cavity axial symmetry, distort RF field and, thus, create a transverse kick, even for particle moving along axes. Dependence of kick on phase causes beam emittance dilution degrade FEL radiation quality. The is most dangerous passing through first accelerating structure linac, where particles energy low. In this paper we analyse coupler in LCSL-II linac.
The Superconducting Quantum Materials and Systems center is developing searches for dark photons, axions ALPs with the goal of improving upon current state-of-the-art sensitivity. These efforts leverage on Fermi National Accelerator expertise ultra-high quality factor superconducting radio frequency cavities combined research quantum technology. Here we focus multiple axion that utilize ~1E10 their resonant modes to enhance production and/or detection in cavity volume. In addition, present...
Temporal fluctuations in the superconducting qubit lifetime, $T_1$, bring up additional challenges building a fault-tolerant quantum computer. While exact mechanisms remain unclear, $T_1$ are generally attributed to strong coupling between and few near-resonant two-level systems (TLSs) that can exchange energy with an assemble of thermally fluctuating fluctuators (TLFs) at low frequencies. Here, we report measurements on qubits different geometrical footprints surface dielectrics as function...