CPOTS – 2nd ERASMUS Intensive ProgramIntroduction to Charged Particle Optics:

Theory and Simulation

http://cpots2012.physics.uoc.grDept. of Physics, University of Crete

Aug 19 – Sept 2, 2012 Heraklion, Crete, GREECE

http://cpots2012.physics.uoc.gr 2

Group ProjectBuilding the International Thermonuclear

Experimental Reactor (ITER)

IoannisJordi

Stefan

Dr. Jason GreenwoodDept. of Physics and Astronomy

Queen’s University BelfastE-mail: j.greenwood@qub.ac.uk

What is ITER?

ITER Nuclear

fusion research and engineering project

Expected to produce ten times the amount of energy input

Largest Tokamak reactor

Tokamak

Confine a plasma in the shape of a torus

Helicoidal field

Fusion Two or more atomic

nuclei join together to form a single nucleus

Deuterium, tritium

Parameters of ITER

Central radius R0=6,2m Inner radius r0=2,0m

Parameters of ITER 18 toroidal coils carrying

up to 80kA giving a maximum field of 11,8T (5,3T at outer radius)

Deuterium, tritium and α-particles

Plasma current 15MA Plasma temperature 8keV

Building ITER in SIMION

Step 1 using the solenoid-example studying the .lua-file Fly´m

Building ITER in SIMION

Step 1 using the solenoid-example studying the .lua-file Fly´m

Building ITER in SIMION

Step 2a adapting the toroid-example studying the .lua-file Fly´m

Building ITER in SIMION

Step 2a using the toroid-example studying the .lua-file Fly´m

Building ITER in SIMION

Step 2b trying different particle conditions

(mass, charge, angle, energy) and magnetic field strength Trapping is not possible!

Building ITER in SIMION

Step 2b trying different particle conditions

(mass, charge, angle, energy) and magnetic field strength Trapping is not possible!

Building ITER in SIMION

Step 2b explanation for drift: gradient in the

magnetic field Non homogeneous-field Stronger nearcenter

Building ITER in SIMION

Step 3a adding a current loop in LUA

Building ITER in SIMION

Step 3b new parts in the LUA-code:local poloidal_current = 150000local field2 = MField.hoop { current = poloidal_current, center = MField.vector(0,0,0), normal = MField.vector(0,0,1), radius = 6210 }local field = MField.combined_field{field1,field2}

Building ITER in SIMION

Step 4adefine particles:

ParticleSymbo

l

Charge

[e]

Mass[amu]

Energy

[keV]Colour

α-Particle

42He 2+ 4 4.00

0red

Deuterium

21D 1+ 2 100 green

Tritium 31T 1+ 3 100 blue

Proton p 1+ 1 100 pink

Electron e 1- 5*10-

4

100 cyan

Building ITER in SIMION

Step 4b Fly´m

α-particledeuteriumtritiumprotonelectron

Results

α-particledeuteriumtritiumprotonelectron

Problems

even small errors in calculation may cause „untrapping“ (Trajectory quality)

Processing time!

Conclusions

Centered particles are trapped (theoretically forever) independent from starting direction!

Particles at the edge aren´t trapped stable

„trapping area“: +0,8m to -0,3m from the center-radius

Thank you for your attention!