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Janardan Upadhyay
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Plasma treatment of bulk niobium surface for superconducting rf cavities:<? format?> Optimization of the experimental conditions on flat samples
M Rašković, J Upadhyay, L Vušković, S Popović, AM Valente-Feliciano, ...
Physical Review Special Topics—Accelerators and Beams 13 (11), 112001, 2010
222010
Plasma processing of large curved surfaces for superconducting rf cavity modification
J Upadhyay, D Im, S Popović, AM Valente-Feliciano, L Phillips, ...
Physical Review Special Topics-Accelerators and Beams 17 (12), 122001, 2014
162014
Etching mechanism of niobium in coaxial Ar/Cl2 radio frequency plasma
J Upadhyay, D Im, S Popović, AM Valente-Feliciano, L Phillips, ...
Journal of Applied Physics 117 (11), 2015
152015
High etching rates of bulk Nb in microwave discharge
M Rašković, S Popović, J Upadhyay, L Vušković, L Phillips, ...
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 27 (2 …, 2009
152009
Continuous and coordinated efforts of structure wakefield acceleration (SWFA) development for an energy frontier machine
C Jing, J Power, J Shao, G Ha, P Piot, X Lu, A Zholents, A Kanareykin, ...
arXiv preprint arXiv:2203.08275, 2022
142022
Apparatus and method for plasma processing of SRF cavities
J Upadhyay, D Im, J Peshl, M Bašović, S Popović, AM Valente-Feliciano, ...
Nuclear Instruments and Methods in Physics Research Section A: Accelerators …, 2016
132016
Effect of self-bias on cylindrical capacitive discharge for processing of inner walls of tubular structures—Case of SRF cavities
J Upadhyay, J Peshl, S Popović, AM Valente-Feliciano, L Vušković
AIP advances 8 (8), 2018
92018
Reversal of the asymmetry in a cylindrical coaxial capacitively coupled Ar/Cl2 plasma
J Upadhyay, D Im, S Popović, L Vušković, AM Valente-Feliciano, ...
Journal of Vacuum Science & Technology A 33 (6), 2015
92015
Cryogenic rf test of the first SRF cavity etched in an rf Ar/Cl2 plasma
J Upadhyay, A Palczewski, S Popović, AM Valente-Feliciano, D Im, ...
AIP Advances 7 (12), 2017
52017
Plasma processing of large surfaces with application to SRF cavity modification
J Upadhyay, S Popovic, L Vuskovic, D Im, AM Valente, H Phillips
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA …, 2013
52013
Large-volume resonant microwave discharge for plasma cleaning of a CEBAF 5-cell SRF cavity
J Mammosser, S Ahmed, K Macha, J Upadhyay, M Nikolić, S Popović
Proc. of IPAC 2012, 2012
52012
On a dielectric-barrier and a microwave-cavity discharge in synchronized operation—the case of a helium/oxygen mixture
M Nikolic, S Popovic, J Upadhyay, L Vuskovic, R Leiweke, B Ganguly
Plasma Sources Science and Technology 21 (1), 015004, 2012
42012
Design of a ceramic enhanced normal conducting standing wave accelerator structure for higher shunt impedance
J Upadhyay, H Xu, K Nichols, JW Lewellen
Nuclear Instruments and Methods in Physics Research Section A: Accelerators …, 2022
32022
Radio frequency plasma method for uniform surface processing of rf cavities and other three-dimensional structures
S Popovic, J Upadhyay, L Vuskovic, HL Phillips, AM Valente-Feliciano
US Patent 9,852,891, 2017
32017
Resonant-frequency discharge in a multi-cell radio frequency cavity
S Popović, J Upadhyay, J Mammosser, M Nikolić, L Vušković
Journal of Applied Physics 116 (17), 2014
32014
Plasma etching rates and surface composition of bulk niobium treated in ar/cl2 microwave discharge
M Rašković, J Upadhyay, S Popović, L Vušković, AM Valente-Feliciano, ...
Proceedings of EPAC08, 2008
32008
Initial results from 35 keV H+ beam at the LANL RFQ test stand
R Thornton, A Alexander, K Bishofberger, G Dale, J Duran, SIS Guitron, ...
Proc. IPAC'24, 149-152, 0
3
Self-bias Dependence on Process Parameters in Asymmetric Cylindrical Coaxial Capacitively Coupled Plasma
J Upadhyay, D Im, S Popović, AM Valente-Feliciano, L Phillips, ...
arXiv preprint arXiv:1506.05167, 2015
22015
Design of the H-beamline for the LANL RFQ test stand
SS Guitron, A Alexander, J Barraza, K Bishofberger, G Dale, ...
Proc. IPAC'24, 2993-2995, 0
2
Charge per Micro-Pulse Calculation for Ideal Lujan and WNR beams
CE Taylor, E Henestroza, EC Huang, J Upadhyay
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States), 2023
12023
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