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Development of a new compact 5.8 GHz
ECR ion source at LPSC
WEPP09
J. Angot1, L. Bonny1, J. Jacob1, T. Lamy1, P. Sole1, P. Sortais2, T. Thuillier1, F. Villa1
1 CNRS/IN2P3/LPSC - 53, rue des Martyrs - 38026 Grenoble Cedex, France
2 Polygon Physics - 53, rue des Martyrs - 38026 Grenoble Cedex, France
Abstract
LPSC is developing a new 5.8 GHz compact ion source to produce low charge state ion beams and study their capture in the
PHOENIX charge breeder. The source was designed to meet criteria like stability, compactness and low cost. It is mounted on a
DN160 iso K flange and is fully under vacuum during operation. The technology brings modularity to ease the development. It can
operate up to 60 kV. The plasma is heated by a 100 W solid state amplifier. The ECRIS produces 1 mA of H+ beam with 20 W of
HF power and low charge state Argon ions. It was tested under several microwave and magnetic configurations on a test bench
equipped with a mass spectrometer and diagnostics. Given its excellent performances, this source was installed to drive the
accelerator-based neutron source, GENEPI 2, at LPSC.
The development of the source together and its performances are presented. Future plans for this ion source are discussed.
This work was supported by the ERA-NET NuPNET in the framework of the EMILIE project.
Ion source design
HF configurations (HFSS simulations)
Type
NW 160
support flange
Water cooled
Plasma chamber
E field distribution (V/m)
Max E field on axis
(kV/m for 1 W)
Coaxial, antenna with couplers
100
Modular HF circuit
(circular waveguide here)
Coaxial , antenna
Gas, cooling, HV and HF
servitudes on the flange
Modular magnetic structure
(permanent magnets)
15
Extraction system
Stability, modularity, compactness, low cost
Circular waveguide TE11 mode
2.5
Magnetic configurations
Type
Permanent magnets
configuration
B field distribution (T)
Mathematica, radia simulations
First application of the source on GENEPI 2
In June 2016, the 5.8 GHz ions source was installed on GENEPI2 at
LPSC, the accelerator-based fast neutron source for multipurpose
applications (nuclear physics experiments, irradiation platform, neutron
detector calibration). The goal is to produce 1 mA of D+ beam at 220 kV.
Gradient
250kV platform
Optics
Acceleration
gap
Min B
Spectrometer
Ion source ready for insertion in the
vacuum chamber of the 250 kV platform
Results
Extracted currents with a Ø4 mm plasma electrode hole
Species
Current
(mA)
Ar+
1
25
40
H+
1
63
30
MinB / Waveguide
Ar+ / Ar2+ /
Ar3+ / Ar4+
0.185 / 0.142 /
0.044 / 0.010
81
30
MinB / Waveguide
D+
1.15
17
30
MinB / Waveguide
H+
1.45
45
35
Magnetic / HF configs
Gradient /Coaxial
antenna + couplers
MinB / coaxial
antenna
HF power Extraction voltage
(W)
(kV)
The GENEPI2 accelerator beam transport line
In July 2016, a first D+ test beam was produced at 220 kV, with a total
current limited to 47 µA by a reduced plasma electrode hole (Ø1 mm). Full
characterization is underway.
Future plans
• Test of new magnetic structures and HF couplings
• Increase of the plasma electrode hole to increase the
extracted currents
• Design studies for HF frequency increase
• Lower the source pressure to improve the achievable
charge state