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Phase measurement and control of bunched beams

Description: An ion bean buncher was developed at ANL for bunching all ion species through a tandem accelerator. Transit time variations through the tandem, caused by ripple and fluctuations in the injection and lens power supplies and terminal voltage, and to varying voltage distributions in the accelerating tube, cause a beam-phase variation at the output of the tandem. A beam-phase measurement and control system was designed and installed in conjunction with the ion beam buncher to control beam phase at the tandem output. That system is described. (GHT)
Date: January 1, 1978
Creator: Lewis, R.N.
Partner: UNT Libraries Government Documents Department

Calorimetric systems designed for in-field nondestructive assay of plutonium-bearing materials

Description: Conventional calorimetric design measures the temperature rise of a plutonium-containing sample chamber in contact with a large water-bath heat sink. This design lacks the mobility needed by inspection personnel. The Argonne National Laboratory air-chamber isothermal calorimeters are low-thermal capacitance devices which eliminate the need for large, constant-temperature heat sinks. A bulk calorimeter designed to measure sealed containers holding up to 3 kg Pu, and a small-sample calorimeter designed to measure mixed-oxide fuel pellets and powders are discussed. The operational characteristics of these instruments are described, and the results of sample assays are presented. (2 figs., 2 tables)
Date: January 1, 1978
Creator: Roche, C.T.; Perry, R.B.; Lewis, R.N.; Jung, E.A. & Haumann, J.R.
Partner: UNT Libraries Government Documents Department

Energy measurement using a resonator-based time-of-flight system

Description: The resonant time-of-flight system which has been developed has several advantages over other potential approaches. The system is non-interceptive and nondestructive. The beam phase space is preserved. It is non-dispersive. Path length variations are not introduced into the beam transport which would reduce the timing resolution. It has a large signal-to-noise ratio when compared to non-resonant beam pick-up techniques. It provides the means to precisely set the linac energy and, potentially, to control the energy in a feedback loop is desired. It is less expensive than an equivalent magnetic system.
Date: January 1, 1983
Creator: Pardo, R.C.; Lewis, R.N.; Johnson, K.W. & Clifft, B.
Partner: UNT Libraries Government Documents Department