COMPLECS Coupling Of Microwaves to PLasma for Electron Cyclotron

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COMPLECSCoupling Of Microwaves to PLasma for
Electron Cyclotron  resonance ion Sources
INFN - GSI - GANIL - LPSC - JYFL - KVI CERN -
ATOMKI- TSL - NIPNE - IKF- IAP
The core of the JRA consists of the study and
analysis devoted to the search for innovative
methods able to increase the energy content of
the plasma in ECR ion sources, with the final
goal to obtain intense beams of highly charged
heavy ions, with special regards to metallic
elements, particularly important for the TNA.

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Key points

• The improvement of ECR ion source performances
  has been based on the increase of confinement
  time and plasma density, so high magnetic field
  trap has been designed and higher frequency has
  been used.

• In the last three years, it was understood that a
  better knowledge of the plasma-wave interaction,
  of the plasma-wall interaction and of the
  multi-charged ion beam formation may permit
  important steps forward.
• The ECR-heating has to be studied by taking into
  account the wave behaviour and the mode structure
  inside the plasma chamber.
• Plasma diagnostics will study the hot electrons
  loss on the plasma chamber wall to improve the
  ECRIS physics understanding.

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Requirements
The comprehension of ion formation mechanism will
be beneficial for all the existing sources within
TNA, in particular for the sources that will
produce intense beams of highly charged ions.
GSI ions of (A/q) 1 to 8.5 are needed, dc
mode Xe20 1
emA pulsed mode 6 mA of U28 GANIL, INFN-LNL
(q/A) (1/3)
1 emA 36Ar12 cw mode, krypton beams
CERN 1 emA Pb27 pulsed mode Cyclotrons
(INFN-LNS, KVI, JYFL,TSL)
heavy ion beams up to U60
between 0.1 and 5 eµA (cw mode) ECOS 0.1 - 1
emA with charge state as high as possible
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Methods

• The sources already existing (MS-ECRIS,
  A-PHOENIX, SERSE, and other sources available in
  the laboratories involved in this project) will
  be used for these tests.

• For some ECRIS a possible extension of operating
  frequency and the use of broadband amplifiers is
  under consideration, with the contribution of the
  associated Inst. Appl. Phys., Nizhny Novgorod.
• Special attention has to be paid to the beam
  formation, in order to ensure that a high quality
  ion beam is produced, even for high intensities,
  that will have beneficial effects on the
  transport.
• The theory demonstrated that higher beam
  intensity can be achieved with lower microwave
  power, that results also in a higher source
  reliability and beam availability.

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Metal ion beams
Metal ion beams production is not new, but indeed
new methods are needed because the state of the
art does not permit to satisfy all the
requirements of Nuclear Physics
experiments Problems occur for
expensive/reactive/high melting point materials
Resistively heated oven developed during FP6

• Compact inductive oven may be the ideal tool for
  any facility.
• Innovative methods and new material combinations
  are strongly
• required for all accelerator facilities.

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Additional resources

• Additional resources will be made available by
  the different Institutions.

• In particular, different ECR ion sources may be
  used for the experiments, including MS-ECRIS and
  A-PHOENIX, built with a contribution of EU under
  FP6/EURONS.
• A relevant number of diagnostics tools are
  already available at some laboratories and some
  other may be built in the coming years with own
  resources of the participating Institutions (beam
  diagnostics, microwave interferometry, optical
  diagnostics, etc.).
• Fresh money will be available from INFN, to
  build an innovative microwave generator,
  fulfilling the requirements needed, provided that
  a contribution of the same order would be
  available from EU.