Transcript COMPLECS Coupling Of Microwaves to PLasma for Electron

I3 EURONS-2
COMPLECS
COMPLECS
Coupling 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.
Giovanni Ciavola
Town Meeting, Sept. 19th, 2007, Helsinki
1
I3 EURONS-2
COMPLECS
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.
Giovanni Ciavola
Town Meeting, Sept. 19th, 2007, Helsinki
2
I3 EURONS-2
COMPLECS
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
Giovanni Ciavola
Town Meeting, Sept. 19th, 2007, Helsinki
3
I3 EURONS-2
Methods
COMPLECS
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.
Giovanni Ciavola
Town Meeting, Sept. 19th, 2007, Helsinki
4
I3 EURONS-2
Metal ion beams
COMPLECS
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
up to 2000˚C
large dimensions and low reliability at the highest temperature
 Compact inductive oven may be the ideal tool for any facility.
 Innovative methods and new material combinations are strongly
required for all accelerator facilities.
Giovanni Ciavola
Town Meeting, Sept. 19th, 2007, Helsinki
5
I3 EURONS-2
Additional resources
COMPLECS
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.
Giovanni Ciavola
Town Meeting, Sept. 19th, 2007, Helsinki
6