1. Fractal modeling of vacuum arc cathode spots PhD., Ausheva Nataliya aana@svitonline.com MSc., Demchyshyn Anatoliy demch@iptelecom.net.ua

2. Physical vapor deposition Decorative coatings Functional coatings Ausheva N., Demchyshyn A.

3. Evaporation problem Ausheva N., Demchyshyn A.

4. Fractal geometry Ausheva N., Demchyshyn A.

5. Fractal nature of cathode spots Ausheva N., Demchyshyn A.

6. System flowchart Ausheva N., Demchyshyn A.

7. Cathode spot walk modeling results Ausheva N., Demchyshyn A. Without magnetic field With tangent magnetic field

8. CPU Aggregate stochastic fractal: DLA u = 1 DBM u > 2,3… Proposed method u = 1,2,3… u – random walkers count Iterations count > 500k

9. GPU Ausheva N., Demchyshyn A. Input discrete element fractal Postprocessed fractal Crater (arc aftermath)

10. GPU (simplified fragment shader) Ausheva N., Demchyshyn A. uniform sampler2D tiu_u; uniform sampler2D tiu2_u; void main() { vec3 color; color = GaussianBlur(tiu_u, 3); color = color * Random(tiu2_u); gl_FragColor = vec4(color, 1.); }

11. Fractal structure analysis Ausheva N., Demchyshyn A.

12. Results Ausheva N., Demchyshyn A.

13. Thank you The vacuum chamber was kindly provided by I.M. Frantsevich Institute of problems of material science, National Academy of Science of Ukraine, Kiev.