91 citations · 474 across the 32 of their papers we have counts for
34 papers
UPLOAD-HELIX: High-Helicity Single-Mode Microwave Haloscope with Low-Noise Interferometric Readout for Ultralight Axion Dark Matter
Robert C. Crew, Emma C. I. Paterson, Maxim Goryachev +5
We propose a superconducting single-mode microwave haloscope based on chiral cavity resonators for the detection of ultralight dark matter axions over the mass range $4\times10^{-1…
High- Treatment of CEBAF 1.5 GHz SRF Cavities
Pashupati Dhakal
The Continuous Electron Beam Accelerator Facility (CEBAF) was the first large-scale accelerator to employ superconducting radiofrequency (SRF) cavities for continuous-wave operatio…
Role of microstructure on flux expulsion of superconducting radio frequency cavities
B. D. Khanal, S. Balachandran, S. Chetri +8
The trapped residual magnetic flux during the cool-down due to the incomplete Meissner state is a significant source of radio frequency losses in superconducting radio frequency (S…
Development of a plasma simulation tool for accelerating cavities
N. K. Raut, I. H. Senevirathne, T. Ganey +2
Plasma processing of superconducting radio frequency (SRF) cavities has shown an improvement in accelerating gradient by reducing the radiation due to field emission and multipacti…
Impact of medium temperature heat treatment on flux trapping sensitivity in SRF cavities
Pashupati Dhakal, Bashu Dev Khanal, Eric Lechner +1
The effect of mid-T heat treatment on flux trapping sensitivity was measured on several 1.3 GHz single cell cavities subjected to vacuum annealing at temperature of 150 - 400 $^\ci…
Field, frequency and temperature dependence of the surface resistance of nitrogen diffused niobium superconducting radio frequency cavities
P. Dhakal, B. D. Khanal, A. Gurevich +1
We report the RF performance of several single-cell superconducting radio-frequency cavities subjected to low temperature heat treatment in nitrogen environment. The cavities were…
Temperature, RF Field, and Frequency Dependence Performance Evaluation of Superconducting Niobium Half-Wave Cavity
N. K. Raut, B. D. Khanal, J. K. Tiskumara +4
Recent advancement in superconducting radio frequency cavity processing techniques, with diffusion of impurities within the RF penetration depth, resulted in high quality factor wi…
Quench Detection in a Superconducting Radio Frequency Cavity with Combine Temperature and Magnetic Field Mapping
B. D. Khanal, P. Dhakal, G. Ciovati
Local dissipation of RF power in superconducting radio frequency cavities create so called hot spots, primary precursors of cavity quench driven by either thermal or magnetic insta…
Evaluation of flux expulsion and flux trapping sensitivity of srf cavities fabricated from cold work Nb sheet with successive heat treatment
B. D. Khanal, P. Dhakal
The main source of RF losses leading to lower quality factor of superconducting radio-frequency cavities is due to the residual magnetic flux trapped during cool-down. The loss due…
Simulation of the dynamics of gas mixtures during plasma processing in the C75 Cavity
N. K. Raut, T. Ganey, P. Dhakal +1
Plasma processing using a mixture of noble gas and oxygen is a technique that is currently being used to reduce field emission and multipacting in accelerating cavities. Plasma is…
Advancements in Superconducting Microwave Cavities and Qubits for Quantum Information Systems
Alex Krasnok, Pashupati Dhakal, Arkady Fedorov +3
Superconducting microwave cavities with ultra-high Q-factors are revolutionizing the field of quantum computing, offering long coherence times exceeding 1 ms, which is critical for…
Development of a prototype superconducting radio-frequency cavity for conduction-cooled accelerators
G. Ciovati, J. Anderson, S. Balachandran +18
The higher efficiency of superconducting radio-frequency (SRF) cavities compared to normal-conducting ones enables the development of high-energy continuous-wave linear accelerator…
RF Accelerator Technology R&D: Report of AF7-rf Topical Group to Snowmass 2021
Sergey Belomestnykh, Emilio A. Nanni, Hans Weise +18
Accelerator radio frequency (RF) technology has been and remains critical for modern high energy physics (HEP) experiments based on particle accelerators. Tremendous progress in ad…
Medium-Grain Niobium SRF Cavity Production Technology for Science Frontiers and Accelerator Applications
G. Myneni, Hani E. Elsayed-Ali, Md Obidul Islam +15
We propose cost-effective production of medium grain (MG) niobium (Nb) discs directly sliced from forged and annealed billet. This production method provides clean surface conditio…
Nitrogen Doping and Infusion in SRF Cavities: A Review
Pashupati Dhakal
Advances in SRF technology over the last 40 years allowed achieving accelerating gradients ~ 50 MV/m corresponding to peak surface magnetic field close to the theoretical limit of…
Flux expulsion in niobium superconducting radio-frequency cavities of different purity and essential contributions to the flux sensitivity
Pashupati Dhakal, Gianluigi Ciovati, Alex Gurevich
Magnetic flux trapped during the cooldown of superconducting radio-frequency cavities through the transition temperature due to incomplete Meissner state is known to be a significa…
High Frequency Nonlinear Response of Superconducting Cavity-Grade Nb surfaces
Bakhrom Oripov, Thomas Bieler, Gianluigi Ciovati +9
Nb Superconducting Radio-Frequency (SRF) cavities are observed to break down and lose their high-Q superconducting properties at accelerating gradients below the limits imposed by…
Effect of Low Temperature Baking in Nitrogen on the Performance of a Niobium Superconducting Radio Frequency Cavity
Pashupati Dhakal, Santosh Chetri, Shreyas Balachandran +2
We report the rf performance of a single-cell superconducting radiofrequency cavity after low temperature baking in a nitrogen environment. A significant increase in quality factor…
Role of Thermal Resistance on the Performance of Superconducting Radio Frequency Cavities
Pashupati Dhakal, Gianluigi Ciovati, Ganapati Rao Myneni
Thermal stability is an important parameter for the operation of the superconducting radio frequency (SRF) cavities used in particle accelerators. The rf power dissipated on the in…
Enhancement in Quality Factor of SRF Niobium Cavities by Material Diffusion
Pashupati Dhakal, Gianluigi Ciovati, Peter Kneisel +1
An increase in the quality factor of superconducting radiofrequency cavities is achieved by minimizing the surface resistance during processing steps. The surface resistance is the…
Reply to "Comment on the 'Decrease of the surface resistance in superconducting niobium resonator cavities by the microwave field'"
G. Ciovati, P. Dhakal, A. Gurevich
In a recent comment [arXiv:1405.2978v1 (2014)] Romanenko and Grassellino made unsubstantiated statements about our work [Appl. Phys. Lett. 104, 092601 (2014)] and ascribed to us wr…
Analysis of post wet chemistry heat treatment effects on Nb SRF surface resistance
Pashupati Dhakal, Gianluigi Ciovati, Peter Kneisel +1
Most of the current research in superconducting radio frequency (SRF) cavities is focused on ways to reduce the construction and operating cost of SRF based accelerators as well as…
The Rise of Ingot Niobium as a Material for Superconducting Radiofrequency Accelerating Cavities
P. Kneisel, G. Ciovati, P. Dhakal +4
As a result of a collaboration between Jefferson Lab and niobium manufacturer CBMM, ingot niobium was explored as a possible material for superconducting radiofrequency (SRF) cavit…
Comment on "Proximity breakdown of hydrides in superconducting niobium cavities" [arXiv:1212.3384]
G. Ciovati, P. Dhakal, G. R. Myneni
Comment on Proximity breakdown of hydrides in superconducting niobium cavities [arXiv:1212.3384].