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• W1520295099 abstract "The electron beams required nowadays for nuclear research must offer high intensity, in a narrow energy bin, at high duty cycle. In order to get these characteristics within cost limits consistent with University budgets we decided for a linac-powered race-track microtron (1–3), consisting of a linac section placed between two constant-field magnets so as to drive the electrons through n cotangential race-track orbits. The system behaves like a transfn-rmer multiplying by n the rated energy of the linac and dividing by n its rated current: moreover the recycling magnets endow the linac with a strong phase focusing so that the machine yields the energy of a n-section linac with a much sharper spectrum. This spectrum compaction-is not obtained by simply throwing away part of the electrons against energy-defining slits, but by keep-ing them to oscillate very close to a “synchronous” value of the accelerating voltage, ΔVs = NλBc/2π, determined by the magnetic field B and independent of the external or internal fluctuations of the linac peak voltage ΔVp: λ is the rf wavelength, N the differential harmonic number, the harmonic number of the n-th orbit being given by Nn = No + nN, In principle, therefore, with a well-centered injection bunch the whole rf power transfered to the beam will be spent on the utilized electrons, which fact, added to the drastic reduction in copper losses with respect to a n-section linac, makes the installation and operation costs mual lower than those required by a beam with the same energy, and current within the given narrow energy bin, obtained with a conventional linac and its analyzing magnet. Indeed the efficiency of the rf power transfer to the output beam may be measured by the average input rf power required per unit average beam power within a 0.1% energy bin: this figure is 56 – 65 for the design data of the MIT linac (4), while a sample computation for our machine yields a value 16. Another figure of merit is the beam power lost on the energy-defining slits per unit beam power within a 0.1% energy bin, which is a measure of the high energy background at the entrance of the beam transport system: this is 7 for the quoted data of the MIT linac and 0.5 for our sample computation." @default.
• W1520295099 created "2016-06-24" @default.
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• W1520295099 date "1970-01-01" @default.
• W1520295099 modified "2023-09-27" @default.
• W1520295099 title "Preliminary Report on a 500-MeV Linac-Powered Race-Track Microtron for the Universities of Northwest Italy" @default.
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• W1520295099 doi "https://doi.org/10.1007/978-1-4684-1827-9_100" @default.
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