A version of the Trasco Intense Proton Source optimized for accelerator driven system purposes

Abstract

A full set of measurements of the magnetic field has been carried out to define a different design of the TRASCO Intense Proton Source ͑TRIPS͒ magnetic system, based on permanent magnets, in order to increase the reliability of the source. The two coils of the source generate a maximum field of 150 mT and the optimum field was determined around 95 mT. The OPERA-3D package was used to simulate the magnetic field and a new magnetic system was designed as a combination of three rings of NdFeB magnets and soft iron. The high voltage insulation has been completely modified, in order to avoid any electronics at 80 kV voltage. The description of the magnetic measurements and the comparison with the simulations are presented, along with the mechanical design of the new version permanent magnet TRIPS ͑PM-TRIPS͒ and the new design of the extraction system. Finally the modification of the low energy beam transfer line ͑LEBT͒, which now includes a 30°bending magnet, will be outlined, with special regard to the accelerator availability improvement which can be obtained with the installation of two PM-TRIPS sources or more on the LEBT.

Ion energy increase in laser-generated plasma expanding through axial magnetic field trap

“…The magnetic axis is placed along the normal to the target surface (z direction) at the laser spot position. More details on this magnet are given in Ciavola et al (2004). Inside to the cylinder, the magnet produces field lines parallel to the cylinder axis with a maximum intensity of 0.1 Tesla, constant over 10 cm length, while externally, along the z axis, the field intensity decreases up to a negative value of -300 Gauss, and than grows again to zero.…”

Design, fabrication, and characterization of a solenoid system to generate magnetic field for an ECR proton source

“…Two side solenoid coils, which were identical, generated the mirror field, and the middle solenoid coil was used to compensate the dip in the magnetic field, to have a flat magnetic field. The use of flat field configuration with high field in the centre has been reported to provide better extraction of proton current in the high intensity light ion sources (Celona et al 2000Gobin et al 2004;Ciavola et al 2004;Delferriere et al 2008). The combinations of these three solenoid coils can also produce the off-resonance magnetic field.…”

“…In the presence of the magnetic field, as the charged particles are forced to gyrate along the magnetic field lines, their diffusion perpendicular to the magnetic field lines is restricted, thereby confining the plasma radially to produce homogeneous, high-density plasma. ECR proton and deuteron sources (Celona et al 2000Gobin et al 2004;Ciavola et al 2004;Delferriere et al 2008) have been widely used for development of high-energy accelerators for transmutations (Carminati et al 1993;Lagniel 1998aLagniel , 1998b, neutron spallation (France et al 1996;Lagniel et al 1997), and material science research (Schriber 1994;Tojyo et al 2002;Biri et al 2008). Standard software packages like Poisson and Pandira (http://laacg1.lanl.gov), Opera (www.vectorfields.com), and Intmag (Becker 1989(Becker , 1990) are commonly used for simulation of magnetic field patterns using solenoid coils, or permanent magnets.…”

Microwave Discharge Ion Sources

“…The TRIPS source exceeded all the requirements of the TRASCO project, but in order to simplify it, the VIS source was built in 2006 [12]. In particular, in the VIS source, the movable coils have been replaced with permanent magnets, and the extraction geometry and extraction column have been simplified.…”