1

MUSICC3D: A 3D CODE FOR MODELING MULTIPACTING

Wednesday, October 3, 2013

Unité mixte de recherche

CNRS-IN2P3Université Paris-Sud

91406 Orsay cedexTél. : +33 1 69 15 73 40Fax : +33 1 69 15 64 70http://ipnweb.in2p3.fr

Hamelin Thibault

2

OUTLINE

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

3

PRINCIPLE OF MULTIPACTING

Secondary Emission Yield (SEY)Cycle conditions

4

REPRESENTATION OF MULTIPACTING

Multipacting’s susceptibility zones calculated for copper

(colours represents the SEY)

Parallel plate

Frequency gap

Ele

ctri

c p

eak

fiel

d

5

REPRESENTATION OF MULTIPACTING

Frequency gap

Ele

ctri

c p

eak

fiel

d

Multipacting’s susceptibility zones calculated for copper

(colours represents the SEY)

6

REPRESENTATION OF MULTIPACTING

Frequency gap

Ele

ctri

c p

eak

fiel

d

Multipacting’s susceptibility zones calculated for copper

(colours represents the SEY)

7

REPRESENTATION OF MULTIPACTING

Frequency gap

Ele

ctri

c p

eak

fiel

d

Multipacting’s susceptibility zones calculated for copper

(colours represents the SEY)

8

Structures have complex 3D geometries

Need to use 3D software for Multipacting

3D ASPECT

HF cavities for particle acceleratorHF amplifier

Microwave circuits on satellites

9

OUTLINE

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

10

PRINCIPLE OF CALCULATION WITH MUSICC3D

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 (Ein, ain, Eout, aout) is done with the Montecarlo method. Visualisation of electron’s

trajectory (MUSICC3D)

max

0

nb

SEYQ

11

OUTPUTS OF MUSICC3D

12

OUTLINE

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

13

SIMULATION OF SPIRAL 2 CAVITY

(E = 4.78*Eacc)

Cavity (l/4) in testing at IPNO for the new particle accelerator in GANIL (f = 88 MHz)

14

SIMULATION OF SPIRAL 2 CAVITY

(E = 4.78*Eacc)

Cavity (l/4) in testing at IPNO for the new particle accelerator in GANIL (f = 88 MHz)

15

SIMULATION OF SPIRAL 2 CAVITY

(E = 4.78*Eacc)

Cavity (l/4) in testing at IPNO for the new particle accelerator in GANIL (f = 88 MHz)

16

In red : MUSICC3D simulations

In blue : experimental measures

SIMULATION OF SPIRAL 2 CAVITY

Cavity (l/4) in testing at IPNO for the new particle accelerator in GANIL (f = 88 MHz)

(E = 4.78*Eacc)

17

OUTLINE

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

18

SIMULATION OF SPOKE CAVITY FOR ESS PROJECT

IPNO is in charge of the design of new Spoke cavities for the ESS project

(f = 352 MHz)

19

SIMULATION OF SPOKE CAVITY FOR ESS PROJECT

(E = 4.84*Eacc)

IPNO is in charge of the design of new Spoke cavities for the ESS project

(f = 352 MHz)

20

SIMULATION OF SPOKE CAVITY FOR ESS PROJECT

(E = 4.84*Eacc)

IPNO is in charge of the design of new Spoke cavities for the ESS project

(f = 352 MHz)

21

SIMULATION OF SPOKE CAVITY FOR ESS PROJECT

IPNO is in charge of the design of new Spoke cavities for the ESS project

(f = 352 MHz)

(E = 4.84*Eacc)

22

SIMULATION OF SPOKE CAVITY FOR ESS PROJECT

IPNO is in charge of the design of new Spoke cavities for the ESS project

(f = 352 MHz)

(E = 4.84*Eacc)

23

OUTLINE

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

24

CONCLUSIONS AND PERSPECTIVES

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

25

Thank you for your attention