Development of a permanent magnet light ion source at CEA/Saclay

Abstract

International audienceIn France, the Spiral 2 project dedicated to radioactive beam production is based on a 40 MeV continuous wave (cw) deuteron Linac. This installation will allow extending the variety of accelerated particles to very heavy elements. Such beams will open research domains for the GANIL facility. To inject the requested 5 mA deuteron beam into the Spiral 2 Linac, the performance of the high intensity light ion source (SILHI) allowed us to propose such an electron cyclotron resonance source. SILHI, developed at CEA/Saclay, regularly produces high intensity (over 100 mA) proton or deuteron beams through a $\Phi$ 9 mm aperture. So for this project, the main modifications of the source design concern the permanent magnets which provide the axial magnetic configuration and the $\Phi$ 3 mm aperture. The source produced its first beam (proton) in 2004. This article will report the beam characterization while the source produced $D^+$ beam with intensity as high as 7.0 mA. Recently, this permanent magnet source has been equipped with the $\Phi$ 9 mm plasma electrode. So high intensity proton beams reaching more than 100 mA are now extracted from this source

Radiological Concerns in Operation of Intense Low-Energy Deuteron Beams

“…Comparison of the radiological measurements at SARAF and the references Ferdinand et al (2002), Gobin et al (2004Gobin et al ( , 2006. SARAF Ferdinand et al (2002) Gobin et al (2004) Goben et al (2006 Energy ( c It was assumed that position of the neutron probe is the same as in Ferdinand et al (2002). d The estimation is based on the number of incoming particles, the cross-section at beam energy and the neutron rate.…”

“…Neutron dose from an intense (many mA) low-energy deuteron beam has also been investigated at Commissariat a l'Energie Atomique (CEA)/Saclay (Ferdinand et al 2002;Gobin et al 2004Gobin et al , 2006. Table 3 compares information on neutron rates from those reports and the present one.…”

Development of a test bench of 2.45 GHz ECR ion source for RFQ accelerator

“…To achieve the resonance magnetic field of 0.0875 T for 2.45 GHz frequency, three axially magnetized permanent NdFeB ring magnets are used. Each ring consists of 24 elementary NdFeB magnet of pre-defined shape and sizes [3,4].…”

Minimum ellipse emittance analysis with SCUBEEx code

“…The beams were obtained at rather unusual plasma conditions in the ECR source when nitrogen and hydrogen gases were mixed in approximately equal proportions as it was done in ref. [8]. An example of emittance measurement taken for 40 µA, 40 keV molecular hydrogen beam is shown in figure 4.…”