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1 MUSICC3D: A 3D CODE FOR MODELING MULTIPACTING Wednesday, October 3, 2013 Unité mixte de recherche CNRS-IN2P3 Université Paris-Sud 91406 Orsay cedex Tél. : +33 1 69 15 73 40 Fax : +33 1 69 15 64 70 http://ipnweb.in2p3.fr Hamelin Thibault

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2 1.Introduction of Multipacting 2.MUSICC3D software Principle of calculation with MUSICC3D Outputs of MUSICC3D 3.Simulation of Spiral 2 cavities 4.Simulation of Spoke cavities for ESS project 5.Conclusions and perspectives

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3 Secondary Emission Yield (SEY)Cycle conditions

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4 Multipacting’s susceptibility zones calculated for copper (colours represents the SEY) Parallel plate Frequency gap Electric peak field

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5 Frequency gap Electric peak field Multipacting’s susceptibility zones calculated for copper (colours represents the SEY)

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6 Frequency gap Electric peak field Multipacting’s susceptibility zones calculated for copper (colours represents the SEY)

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7 Frequency gap Electric peak field Multipacting’s susceptibility zones calculated for copper (colours represents the SEY)

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8 Structures have complex 3D geometries Need to use 3D software for Multipacting HF cavities for particle accelerator HF amplifier Microwave circuits on satellites

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9 1.Introduction of Multipacting 2.MUSICC3D software Principle of calculation with MUSICC3D Outputs of MUSICC3D 3.Simulation of Spiral 2 cavities 4.Simulation of Spoke cavities for ESS project 5.Conclusions and perspectives

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10 Developed at IPNO Any 3D geometries (one or more materials) 3D tetrahedral meshing HF field imported from an external field solver Based on the Runge Kutta method and solve trajectories of electrons with the relativistic equation of motion Model of virtual charge The integrations over the multi differential SEY (E in, in, E out, out ) is done with the Montecarlo method. Visualisation of electron’s trajectory (MUSICC3D)

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12 1.Introduction of Multipacting 2.MUSICC3D software Principle of calculation with MUSICC3D Outputs of MUSICC3D 3.Simulation of Spiral 2 cavities 4.Simulation of Spoke cavities for ESS project 5.Conclusions and perspectives

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13 (E = 4.78*E acc ) Cavity ( /4) in testing at IPNO for the new particle accelerator in GANIL (f = 88 MHz)

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14 (E = 4.78*E acc ) Cavity ( /4) in testing at IPNO for the new particle accelerator in GANIL (f = 88 MHz)

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15 (E = 4.78*E acc ) Cavity ( /4) in testing at IPNO for the new particle accelerator in GANIL (f = 88 MHz)

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16 In red : MUSICC3D simulations In blue : experimental measures Cavity ( /4) in testing at IPNO for the new particle accelerator in GANIL (f = 88 MHz) (E = 4.78*E acc )

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17 1.Introduction of Multipacting 2.MUSICC3D software Principle of calculation with MUSICC3D Outputs of MUSICC3D 3.Simulation of Spiral 2 cavities 4.Simulation of Spoke cavities for ESS project 5.Conclusions and perspectives

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18 IPNO is in charge of the design of new Spoke cavities for the ESS project (f = 352 MHz)

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19 (E = 4.84*E acc ) IPNO is in charge of the design of new Spoke cavities for the ESS project (f = 352 MHz)

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20 (E = 4.84*E acc ) IPNO is in charge of the design of new Spoke cavities for the ESS project (f = 352 MHz)

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21 IPNO is in charge of the design of new Spoke cavities for the ESS project (f = 352 MHz) (E = 4.84*E acc )

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22 IPNO is in charge of the design of new Spoke cavities for the ESS project (f = 352 MHz) (E = 4.84*E acc )

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23 1.Introduction of Multipacting 2.MUSICC3D software Principle of calculation with MUSICC3D Outputs of MUSICC3D 3.Simulation of Spiral 2 cavities 4.Simulation of Spoke cavities for ESS project 5.Conclusions and perspectives

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24 Conclusions Prediction Multipacting zones Electric peak field Location Multiple output 2D or 3D trajectories Charges Phases Number of collision Collision energy Perspectives Conception and fabrication of the demonstrator allows the study of Multipacting Characterisation of the varied SEY materials Multipacting study according to the different states of the matter’s surfaces

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25 Thank you for your attention

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