ECRIS-2014 - List of Authors (Mansfeld, D.)

Paper

Title

Page

Periodic Beam Burrent Oscillations Driven By Electron Cyclotron Instabilities In ECRIS Plasmas

5

O.A. Tarvainen, T. Kalvas, H. A. Koivisto, J.P.O. Komppula, R.J. Kronholm, J.P. Laulainen
JYFL, Jyväskylä, Finland
I. Izotov, D. Mansfeld, V. Skalyga
IAP/RAS, Nizhny Novgorod, Russia
V. Toivanen
CERN, Geneva, Switzerland

Experimental observation of cyclotron instabilities in electron cyclotron resonance ion source plasma operated in cw-mode is reported. The instabilities are associated with strong microwave emission and a burst of energetic electrons escaping the plasma, and explain the periodic oscillations of the extracted beam currents. The instabilities are shown to restrict the parameter space available for the optimization of high charge state ion currents.

Slides MOOBMH01 [2.020 MB]

WEOBMH04

Theory of Cyclotron Instability of Hot Electrons in ECRIS: Origin, Manifestation, and Influence on Plasma Confinement

D. Mansfeld, I. Izotov, V. Skalyga, M. Viktorov
IAP/RAS, Nizhny Novgorod, Russia
O.A. Tarvainen
JYFL, Jyväskylä, Finland

Interaction between electromagnetic waves and particles in magnetoactive plasma under cyclotron resonance conditions can result in the growth of cyclotron instabilities of various kinds. Electron cyclotron instability (ECI) is a kinetic type instability, which is driven by the anisotropy of the energetic electrons distribution function traps with the transverse kinetic energy relative to the magnetic field dominating over the longitudinal one. One of the most interesting manifestations of ECI is the generation of bursts of electromagnetic radiation accompanied by hot electron precipitations from the trap. Such phenomena are observed in a wide range of plasma parameters: in the magnetospheres of the Earth and planets, in solar coronal loops, and in laboratory magnetic traps. Recently ECI were experimentally observed in ECR ion sources and it was shown that bursts of hot electrons escaping from the trap can destruct plasma confinement affecting highly charged ions beams current [1]. In this report we discuss basic mechanisms of cyclotron instability growth in non-equilibrium plasma of ECR discharge, main features of instability manifestation and its influence on ECRIS parameters.
* O Tarvainen et al 2014 Plasma Sources Sci. Technol. 23 025020

Slides WEOBMH04 [1.123 MB]

THOMMH03

A Point-like Source of Extreme Ultraviolet Radiation Based on Non-equilibrium Discharge, Sustained by Powerful Radiation of Terahertz Gyrotron

140

V. Sidorov, M.Yu. Glyavin, S. Golubev, I. Izotov, A.G. Litvak, G. Luchinin, D. Mansfeld, S. Razin, V. Skalyga, A. Vodopyanov
IAP/RAS, Nizhny Novgorod, Russia

Funding: The work was supported by RSF within grant No 14-12-00609.
It is proposed in this paper to use discharge plasma supported by terahertz radiation as a source of EUV light for high-resolution lithography. In this report we discuss the experimental investigation of two types of EUV sources based on discharge, supported by powerful gyrotron radiation. Following investigation results are described: -a series of experiments that demonstrate the generation of EUV light from the vacuum-arc discharge plasma in tin vapor in the magnetic trap heated by gyrotron radiation with a frequency of 75 GHz under electron cyclotron resonance (ECR) conditions; -a numerical modeling of the plasma emissivity in the EUV range, depending on the parameters of the heating radiation is performed; -experimental studies of EUV emission from plasma discharge sustained by strong terahertz powerful radiation in inhomogeneous gas flows are started.

Slides THOMMH03 [1.249 MB]

Paper	Title	Page
MOOBMH01	Periodic Beam Burrent Oscillations Driven By Electron Cyclotron Instabilities In ECRIS Plasmas	5
	O.A. Tarvainen, T. Kalvas, H. A. Koivisto, J.P.O. Komppula, R.J. Kronholm, J.P. Laulainen JYFL, Jyväskylä, Finland I. Izotov, D. Mansfeld, V. Skalyga IAP/RAS, Nizhny Novgorod, Russia V. Toivanen CERN, Geneva, Switzerland
	Experimental observation of cyclotron instabilities in electron cyclotron resonance ion source plasma operated in cw-mode is reported. The instabilities are associated with strong microwave emission and a burst of energetic electrons escaping the plasma, and explain the periodic oscillations of the extracted beam currents. The instabilities are shown to restrict the parameter space available for the optimization of high charge state ion currents.
	Slides MOOBMH01 [2.020 MB]

WEOBMH04	Theory of Cyclotron Instability of Hot Electrons in ECRIS: Origin, Manifestation, and Influence on Plasma Confinement
	D. Mansfeld, I. Izotov, V. Skalyga, M. Viktorov IAP/RAS, Nizhny Novgorod, Russia O.A. Tarvainen JYFL, Jyväskylä, Finland
	Interaction between electromagnetic waves and particles in magnetoactive plasma under cyclotron resonance conditions can result in the growth of cyclotron instabilities of various kinds. Electron cyclotron instability (ECI) is a kinetic type instability, which is driven by the anisotropy of the energetic electrons distribution function traps with the transverse kinetic energy relative to the magnetic field dominating over the longitudinal one. One of the most interesting manifestations of ECI is the generation of bursts of electromagnetic radiation accompanied by hot electron precipitations from the trap. Such phenomena are observed in a wide range of plasma parameters: in the magnetospheres of the Earth and planets, in solar coronal loops, and in laboratory magnetic traps. Recently ECI were experimentally observed in ECR ion sources and it was shown that bursts of hot electrons escaping from the trap can destruct plasma confinement affecting highly charged ions beams current [1]. In this report we discuss basic mechanisms of cyclotron instability growth in non-equilibrium plasma of ECR discharge, main features of instability manifestation and its influence on ECRIS parameters. * O Tarvainen et al 2014 Plasma Sources Sci. Technol. 23 025020
	Slides WEOBMH04 [1.123 MB]

THOMMH03	A Point-like Source of Extreme Ultraviolet Radiation Based on Non-equilibrium Discharge, Sustained by Powerful Radiation of Terahertz Gyrotron	140
	V. Sidorov, M.Yu. Glyavin, S. Golubev, I. Izotov, A.G. Litvak, G. Luchinin, D. Mansfeld, S. Razin, V. Skalyga, A. Vodopyanov IAP/RAS, Nizhny Novgorod, Russia
	Funding: The work was supported by RSF within grant No 14-12-00609. It is proposed in this paper to use discharge plasma supported by terahertz radiation as a source of EUV light for high-resolution lithography. In this report we discuss the experimental investigation of two types of EUV sources based on discharge, supported by powerful gyrotron radiation. Following investigation results are described: -a series of experiments that demonstrate the generation of EUV light from the vacuum-arc discharge plasma in tin vapor in the magnetic trap heated by gyrotron radiation with a frequency of 75 GHz under electron cyclotron resonance (ECR) conditions; -a numerical modeling of the plasma emissivity in the EUV range, depending on the parameters of the heating radiation is performed; -experimental studies of EUV emission from plasma discharge sustained by strong terahertz powerful radiation in inhomogeneous gas flows are started.
	Slides THOMMH03 [1.249 MB]