1

DESIGN AND STUDY OF NOVEL SUB-THZ RADIATION

SOURCE “NANOVIRCATOR” IN CST PARTICLE STUDIO

Saratov State University, Saratov State Technical University, Saratov, Russia

WWW: http://nonlin.sgu.ru

*E-mail: phrolovns@gmail.com

Nikita S. Frolov, Semen A. Kurkin, Alexey A. Koronovskii, Artem A. Badarin, Alexander E. Hramov

10th European User Conference, 28-29 April 2015

Carrying forward the THz range

2

John H. Booske. Plasma physics and related challenges of millimeter-wave-to-terahertz and high power microwave radiation. Physics of Plasmas, 15, 2008, 055502.

Compact THz radiation source – “nanoklystron”

3

• Peter H. Siegel, et al. Nanoklystron: a monolithic tube approach to THz Power Generation,

12 International Symposium on Space Terahertz Technology, 2001, P. 82-90.

• John R. Fletcher. Design consideration for submillimeter-wave reflex klystrons, IEEE Transactions on microwave theory and techniques, Vol. 52, N. 10, 2004, P. 2344-2358.

• Balucani M., et al. Nano-Klystron: new design and technology for THz Source, Millimeter waves and THz technology workshop, 2013, P. 1-2

f ~ 0.6 – 1.2 THz

j ~ 100 A/cm2

Ec ~ 2.5-5 V/μm

Vacuum ~ 10-8 Torr

System under study – “nanovircator”

4

a b

(a) “Nanovircator” perspective view; (b) «Nanovircator» cross-section: 1 – electron gun, 2 – drift tube, 3 – cathode, 4 – DC voltage source, 5 – anode grid, 6 – output coaxial waveguide, 7 – collector, 8 – voltage monitor, 9 – Rogowski coil (current monitor)

Overcritical current. Electron beam emission

5

R

AIcr 111003.172/33/23

e

ep

m

ne

0

2

0.1 THz, j ~ 2 kA/cm2

Carbon nanotube cathode:

Int ~ 100 nA ρnt ~ 1010 nt/cm2 jnt ~ 1-10 kA/cm2

C. Papadopoulos, J. M. Xu, et al. Nanotube carbon cathode. Applied Physics Letters, 75, 1999. P. 386

Sub-THz Generation

6

Sub-THz Generation

7

Conclusions

8

The obtained results demonstrate that the proposed virtual cathode oscillator “nanovircator” may be considered as the promising compact sub-THz radiation source that has a simple construction and operates in the absence of the external magnetic field.

Plans and perspectives

• Critical current lowering; • Full-scale mathematical optimization of existing “nanovircator” scheme in CST PS (geometry and beam optimization); • Detailed emission simulation (field emission);

• Analysis of external signal input posibility; • Simulation of coupled “nanovircator” cluster*.

*Moskalenko O.I., Phrolov N.S., Koronovskii A.A., Hramov A.E. Synchronization in the network of Chaotic microwave oscillators. Eur. Phys. J. Special Topics. 222, (2013) 2571-2582