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PSI-2 - the pilot experiment of the JULE-PSI project. Arkadi  Kreter on behalf of FZJ PWI team Institute for Energy and Climate Research - Plasma Physics, Forschungszentrum Jülich , Association EURATOM-FZJ, Trilateral Euregio Cluster, Germany

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slide1

PSI-2 - the pilot experiment

of the JULE-PSI project

Arkadi Kreter on behalf of FZJ PWI team

Institute for Energy and Climate Research - Plasma Physics, Forschungszentrum Jülich, Association EURATOM-FZJ, Trilateral Euregio Cluster, Germany

2nd International Workshop on Plasma Material Interaction Facilities for Fusion Research (PMIF)

Jülich, Germany, 19 September 2011

jule psi j lich linear experiment for psi studies in a hot cell
JULE-PSI: Jülich Linear Experiment for PSI studies in a Hot Cell
  • PMI studies with
  • Neutron irradiated materials
  • All wall materials incl. Beryllium
  • Low quantities of Tritium

Based on PSI-2 / PISCES type device

Installation in a Hot Cell for handling of radioactive and toxic materials

Schematic view

Plasma source

Target chamber

Surface analysis

Linear manipulator

 Talk by B. Unterberg

PSI-2 is the pilot experiment of the JULE-PSI project

psi 1 2 17 years of operation in berlin
PSI-1/2: 17 years of operation in Berlin
  • Formerly operated by IPP-Garching at Humboldt Univ., Berlin
  • PSI-1 was first operated in 1992
  • Upgrade to PSI-2 in 1998: extended target chamber with 2 additional coils
  • Transfer to FZJ in October 2009

PSI-2 installation in Berlin

1 m

psi 2 new life in j lich
PSI-2: new life in Jülich
  • Transferred from Berlin to Jülich in October 2009
  • First plasma in Jülich in January 2011
  • Idea: Existing PSI-2 as the pilot experiment of the JULE-PSI project, outside of hot cell
  • Name: PSI-2 (Jülich)
  • Goals:
    • Gain experience operating linear plasma device
    • Test of components for JULE-PSI
      • Prototype of target station
      • Plasma source optimization
      • Diagnostics
      • Other peripheral components
    • Contribute to current PMI research topics
current installation of psi 2
Current installation of PSI-2

Current status corresponds to the installation in Berlin before transport

first plasma of psi 2 in j lich
First plasma of PSI-2 in Jülich

Text from IEK-4 news web site of 7/Jan/2011

First plasma in PSI-2 Jülich

Today, Friday 7th of January 2011, 6.30 pm, the very first Argon discharge has been produced in the PSI-2 Jülich device. This achievement constitutes a major milestone for our PSI programme on linear devices, which aims at the investigation of PSI processes with neutron activated fusion materials with the linear plasma device JULE-PSI in the Hot Material Laboratory (HML) of FZJ. PSI-2 Jülich will serve as a pilot experiment for this development and supplement our portfolio of facilities for the joint TEC programme on plasma-surface interactions.

Many thanks to the whole PSI-2 team, in particular to our colleagues from Berlin, Werner Bohmeyer and Achim Mans.

Since August 2011 routine operation in deuterium

typical plasma parameters in psi 2
Typical plasma parameters in PSI-2

For deuterium plasma

Example of Ar plasma profile at target position

psi 2 plasma generator with cylindrical cathode
PSI-2: plasma generator with cylindrical cathode

Cylindrical cathode w/o heat shield

  • Arc discharge up to 1000 A and 150 V
  • Typical regime of operation:
    • Heating up and cooling down ~60 min
    • Steady-state plasma of several hours per day
    • Change of discharge parameters (incl. working gas) on one day possible
  • Exchange of the cathode every 12 – 18 months
  • Advantages:
    • Larger emitter area  more efficient plasma production
    • Less prone to break due to thermal stresses
    • Observation through the aperture
  • Drawback (decisive):
    • Hollow plasma profile

Cylindrical cathode assembly

psi 2 new disc shaped cathode
PSI-2: new disc-shaped cathode
  • Originally designed by H. Greuner
  • Partially constructed and tested in Berlin, but never in plasma operation
  • Currently: optimization of design and testing
  • Installation on PSI-2 is planned for Dec. 2011

Heater of disc-shaped cathode

Disc-shaped cathode assembly

plasma source options for jule psi
Plasma source options for JULE-PSI
  • Options to optimize arc source performance / reliability are analysed in collaboration with the Budker Institute  talk by A. Ivanov (for V. Davydenko)
  • Alternatively, helicon-type plasma source is considered, also in collaboration with the Budker Institute
    • Synergy from the helicon source development at ORNL?
target manipulators
Target manipulators
  • First stage: side-fed manipulator from Berlin
    • Currently being refurbished and adapted for our purposes
    • To be installed in Oct 2011
  • Second stage: new target station

PSI-2 current installation

Layout of sample holder in plasma

Side-fed manipulator support structure

target station
Target station

Plasma

source

Typical target position

Exchange and Analysis chamber

Target manipulator

  • Serves as prototype of JULE-PSI target station  talk by B. Unterberg
  • Currently being manufactured
  • Installation by the end of 2011
diagnostics on psi 2
Diagnostics on PSI-2

PSI-2 serves as test-bed for diagnostic development for JULE-PSI

 Focus on reliability and easy maintenance

Plasma diagnostics (characterization of background plasma)

  • Optical spectroscopy
  • Langmuir probe
  • Thomson scattering being considered as substitute of Langmuir probe

In-situ PMI diagnostics

  • Optical spectroscopy
  • IR thermography
  • Quartz microbalance (QMB)

In-vacuo sample analysis

  • Target station: linear manipulator and surface analysis station with
  • Laser-aided analysis methods (LID, LIBS) talk by B. Unterberg
  • Glow discharge spectroscopy talk by C. Klepper
spectroscopy
Spectroscopy

Spectrometer systems available:

i) Direct imaging spectrometer at the target

Spectrometer Acton 0.75m (SP2750 UV-VIS-NIR) with

detector 2D EMCCD Andor NEWTON DU971 1600 x 400

ii) Fibre-coupled spectrometer in Littrow arrangement (10 nm coverage @ R=20000)

Spectrometer 0.75 m Echelle optimised for VIS with

detector 2D EMCCD Andor IXON DU888 EC 1024 x 1024

iii) Fibre-coupled spectrometer in Littrow arrangement (2 nm coverage @ R=100000)

Spectrometer 1.25 m Echelle optimised for VIS with

detector 2D EMCCD Andor IXON DU888 EC 1024 x 1024

iv) 2 sets of 4 channel compact spectrometers (300-858 nm @ R= 7500)

Avantes set (JET KT1-type with 1800 l/mm and 10 m slit):

Ch.1 300-455 nm, ch.2 450-577 nm, ch.3 575-681 nm, ch.4 658-858 nm

v) Overview compact spectrometer

Avantes 300 -1100 nm with 300 l/mm and 10 m slit

vi) Spectrelle and deep UV compact spectrometer

to be shared with TEXTOR

ex situ surface analysis available in fzj
Ex-situ surface analysis available in FZJ
  • High-precision balance (0.1 g)
    • Weight loss measurements
  • Thermal desorption spectrometry (TDS)
    • Retention with temperature resolution
  • SEM / EDX
    • Morphology / Elemental composition
  • Ion beam analyses: NRA, RBS,..
    • Absolute amounts of surface materials, limited depth resolution
  • Secondary Ion Mass Spectrometry (SIMS)
    • Depth distribution of elements
  • X-ray Photoelectron Spectrometry (XPS)
    • Chemical composition and state (e.g. carbidization)
physics programme on psi 2
Physics programme on PSI-2

Recombining deuterium plasma

  • Plasma characterization
  • Hydrogen and impurity spectroscopy
  • Fuel retention in tungsten and graphite under the influence of impurities
  • Erosion of tungsten and tungsten spectroscopy
  • Simulation of transient heat loads by laser (collaboration with Budker Institute)
    • Talks by A. Burdakov and A. Shoshin
  • EUROFER as first wall material

Neutralizer plate

summary
Summary
  • PSI-2 to serve as pilot experiment for JULE-PSI
  • Transferred from Berlin to Jülich and successfully taken into operation
  • New components (cathode, target station, laser, diagnostics) purchased and partially delivered and commissioned
  • Physics programme started with plasma characterization and spectroscopic studies
  • PMI programme to start from October 2011