The Trasco Intense Proton Source ͑TRIPS͒ was installed at INFN-LNS in May 2000 and has been fully operational since the Fall of 2000; now the source fulfills all the requirements of the TRASCO ͑Trasmutazione Scorie͒ project. The proton beam intensity easily exceeds 40 mA at the operating voltage of 80 kV. A set of emittance measurements was carried out for different source conditions and confirmed the simulations performed with the AXCEL code: in all the cases the rms normalized emittance is well lower than the value required for the injection into the RFQ ͑0.2 mm mrad͒; the results will be shown and discussed. Finally a beam reliability of 99.8% has been found during a long run test lasting over 142 h.
Background: Trigeminal schwannomas are rare tumors of the trigeminal nerve. Depending on the location, from which they arise along the trigeminal nerve, these tumors can present with a variety of symptoms that include, but are not limited to, changes in facial sensation, weakness of the masticatory muscles, and facial pain. Case Description: We present a case of a 16-year-old boy with an atypical presentation of a large trigeminal schwannoma: painless malocclusion and unilateral masticatory weakness. This case is the first documented instance; to the best of our knowledge, in which a trigeminal schwannoma has led to underbite malocclusion; it is the 19th documented case of unilateral trigeminal motor neuropathy of any etiology. We discuss this case as a unique presentation of this pathology, and the relevant anatomy implicated in clinical examination aid in further understanding trigeminal nerve pathology. Conclusion: We believe our patient’s underbite malocclusion occurred secondary to his trigeminal schwannoma, resulting in associated atrophy and weakness of the muscles innervated by the mandibular branch of the trigeminal nerve. Furthermore, understanding the trigeminal nerve anatomy is crucial in localizing lesions of the trigeminal nerve.
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.
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