Toohig Fellowship candidate Vittorio Marinozzi Hi LumiLARP collaboration
Toohig Fellowship candidate Vittorio Marinozzi Hi. Lumi-LARP collaboration meeting Napa – April 24 th, 2017
My education (University of Milan): Ø Bachelor degree in Physics, 2011 Ø Master degree in Accelerator Physics and Applied Superconductivity, 2013 Ø Ph. D in Applied Superconductivity, 2017 Work experience: Ø Stage at Fermilab (LARP), 6 months in 2013 Ø Fellowship at INFN-Milano (Hi. Lumi), 2014 Ø Research assistant at INFN-Milano (Euro. Cir. Col/Magix), 2017 Ø Several teaching assistant positions at University of Milan during Ph. D 2
Relevant scientific results and activities: Ø Quench protection study of MQXF (Hi. Lumi LHC low-β quadrupoles) Ø Theoretical model describing coupling between superconducting magnet inductance and inter-filamentcoupling-currents, with experimental measurements and validation Ø Electromagnetic design of a 16 T magnet for the Future Circular Collider (Euro. Cir. Col) Ø Hi. Lumi correctors design, assembly and test at LASA laboratory (INFN-Magix) 3
Quench protection study of MQXF Ø Large stored energy • 0. 12 J/mm 3 Ø Quench protection one of the most challenging aspects Ø First studies: HST > 400 K Ø I have studied in deep the protection circuit and the current discharge during a quench. Ø We reached a successfully protection scheme (HST~260 K) based on IL and OL quench heaters Ø My main contribution: magnet inductance 4
Relevant scientific results and activities: Ø Quench protection study of MQXF (Hi. Lumi LHC low-β quadrupoles) Ø Theoretical model describing coupling between superconducting magnet inductance and inter-filamentcoupling-currents, with experimental measurements and validation Ø Electromagnetic design of a 16 T magnet for the Future Circular Collider (Euro. Cir. Col) Ø Hi. Lumi correctors design, assembly and test at LASA laboratory (INFN-Magix) 5
Superconducting magnet inductance and inter-filament-coupling-currents Ø Main topic of my Ph. D thesis Ø First completely analytical model which describes coupling between inductance and coupling currents in superconducting magnets Why do we need it? Impossible to describe fast experimental current decays from the very beginning 104 A/s Inductance is lower than expected! 6
Superconducting magnet inductance and inter-filament-coupling-currents How does it work? Ø Coupling currents are seen as a magnetization of the coil, resulting in an effect similar to the iron saturation (well-known) Completely analytical! Easy to be implemented in a quench simulation software 7
Superconducting magnet inductance and inter-filament-coupling-currents What are the main results? Ø The model allows to describe the current decays from the very beginning Ø I have measured experimentally the inductance of a magnet during a quench, confirming my expectation Ø It has relevant effects on quench protection studies 8
Relevant scientific results and activities: Ø Quench protection study of MQXF (Hi. Lumi LHC low-β quadrupoles) Ø Theoretical model describing coupling between superconducting magnet inductance and inter-filamentcoupling-currents, with experimental measurements and validation Ø Electromagnetic design of a 16 T magnet for the Future Circular Collider (Euro. Cir. Col) Ø Hi. Lumi correctors design, assembly and test at LASA laboratory (INFN-Magix) 9
Electromagnetic design of a 16 T magnet for the Future Circular Collider FCC: Ø 50 Te. V proton beams Ø 100 km circumference Ø 16 T bending dipoles Euro. Cir. Col has the target of developing the conceptual design of FCC within 2020 10
Electromagnetic design of a 16 T magnet for the Future Circular Collider Ø I am the responsible of the electromagnetic design of a 16 T Nb 3 Sn cosine-theta dipole in the INFN Euro. Cir. Col team Ø 16 T is a challenging magnetic field for Nb 3 Sn Ø Design should take care of • Conductor amount • Field quality • Quench protection Work in progress 11
Relevant scientific results and activities: Ø Quench protection study of MQXF (Hi. Lumi LHC low-β quadrupoles) Ø Theoretical model describing coupling between superconducting magnet inductance and inter-filamentcoupling-currents, with experimental measurements and validation Ø Electromagnetic design of a 16 T magnet for the Future Circular Collider (Euro. Cir. Col) Ø Hi. Lumi correctors design, assembly and test at LASA laboratory (INFN-Magix) 12
Hi. Lumi correctors design, assembly and test at LASA laboratory Ø The INFN-LASA follows the design, construction and test of the 5 prototypes of the high order corrector magnets for the interaction regions of Hi. Lumi (Magix project) 13
Hi. Lumi correctors design, assembly and test at LASA laboratory OD=320 mm Completed & succefully tested Sextupole OD=320 mm Octupole OD=460 mm OD=320 mm Construct. phase Decapole Physical lenght: • 100 mm from 6 -pole to 10 -pole • 430 mm 12 -pole normal • 840 mm 4 -pole skew Conductor type: Nb. Ti Peak field on cond. : 2 -3 T Operating current: 120 -180 A Dodecapole Skew quad Margin on load line: 40% 14
Hi. Lumi correctors design, assembly and test at LASA laboratory Ø My responsibility is test planning and data analysis • I interact with the test performing team, and I take leading decisions before and during the tests • I make quench simulations to ensure magnet safety during tests, and during the operation in the machine Ø I am gaining experience in coil winding and impregnation, magnet assembly, vacuum, cryogenics… 15
What is my interest in LARP? Ø Magnet quench protection My main activity in last 4 -5 years Ø Quench simulation Ø Data analysis Explaining an experimental behavior is exciting! Ø Magnet testing Getting experience Ø Magnet design and manufacture Ø Ready to any new exciting challenge that you could offer me 16
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