Characteristics of Composite Carbon Resistors Used for Measuring Accelerator Terminal Voltages

aryAccelerator and Beam Transport SystemThe Cornell Dynamitron is being used as a source of monoenergetic neutrons in ihe range 30-500 keV, with fluxes up to 10 n/sr/s. Problems of generating and handling the 2 Mev, 4 ma beam are discussed. Analyzing magnet slit feedback is essential for accurate control of neutron energy. Contrary to other published data for these machines, we observe up to 3% drift in the energy when it is controlled by the voltage feedback system. Discrepancies between this and previously published data are discussed. IntroductionAn intense source of monoenergetic neutrons with low gamma background is essential for fundamental investigations of the neutron damage process in ionic materials. Fast neutrons in the energy range 0.5 -20 Mev can be generated using such prolific reactions as T(p,n), C(d,n), D(d,n), Li(p,n), and T(dn)ls2, with accelerators operating between 0.5 -5.0Mev. lheoretically, neutron yields of up to 10 n/sr/s can be obtained with milliampere beams of protons and deuterons.The Dynamitron principle has provided a high voltage power supply capable of generating 40 kW beams, but while a 17 ma, 2.0 Mev electron beam has been demonstrated, production of ion beams of this power is difficult. The performance limiting factors in the PEA 3.0 series of Dynamitrons have been associated with high gas loads at the source, which cause high corona currents and component failure due to overhe ting from back streaming electrons . Further, the low proton yield of the duoplasmatron ion sources used in these machines has reduced the useful current to about 20% of the total.In order to obtain satisfactory dosages for a study of neutron radiation damage in KBr crystals, the authors have carried out a numbnr of modifications to the Cornell Dynamitron which have permitted stable operation at 4.0 ma total beam current, with a maximum of 1.4 ma of H+ delivered onto the neutron producing target at 2.2 Mev.In this paper we describe the performance and operation of the accelerator and its beam transport system. The Li (p,n) reaction was used to produce 500 keV neutrons.

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Characteristics of Composite Carbon Resistors Used for Measuring Accelerator Terminal Voltages

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References 12 publications

Energy dependence of electron-induced radiation damage in tungsten

Energy dependence of electron-induced radiation damage in tungsten

Operation of a 4 ma Dynamitron as a Monoenergetic Neutron Source

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