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Nuclear Science, IEEE Transactions on

Issue 1  Part 2 • Date Feb 1989

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Displaying Results 1 - 5 of 5
  • Orbit-reversing magnets for the National Bureau of Standards-Los Alamos Racetrack Microtron

    Publication Year: 1989 , Page(s): 1306 - 1310
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB)  

    In the National Bureau of Standards (NBS)-Los Alamos Racetrack Microtron (RTM), the 17-MeV electron beam that has made one pass through the RTM linac is deflected 180 degrees in one end magnet and is returned to the same end of the (standing wave) linac for a second pass. A pair of dipole magnets on the linac axis compensates for the beam displacement caused by the end magnet, so that the beam enters the linac on axis. The two magnets are designed to have equal field integrals in order to produce a pure displacement. Matching the field integrals was complicated by the quite different widths of the two magnets, which have different beam clearance requirements. In addition, the wider magnet contains a quadrupole coil for beam steering. Design considerations for the magnet system are presented. Magnetic field measurements show that critical design goals have been achieved. View full abstract»

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  • A novel approach for optimal control of a pressurized water reactor

    Publication Year: 1989 , Page(s): 1317 - 1325
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (700 KB)  

    A novel approach for optimal control of the H.B. Robinson nuclear power plant in North Carolina is presented. Optimal linear quadratic regulator (LQR) theory is used for the control. The appealing feature of the LQR design used here over the previous applications of the technique to nuclear reactors is that the proposed controller design algorithm for the reactor is capable of selecting appropriate weighting matrices in the cost functional. so that all or a selected number of the open-loop system poles are placed at desired locations while the performance index is minimized. Another advantage of the approach is that aggregation is used in designing the controller, so that second- or fourth-order matrix computations are performed almost throughout the design procedure. View full abstract»

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  • Order reduction of a complete PWR-plant model and optimal design of an overall plant observer

    Publication Year: 1989 , Page(s): 1311 - 1316
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB)  

    A computer code capable of reliably predicting an optimal control strategy for a complete pressurized water reactor nuclear power plant is developed. The state, control, disturbance, and output vectors for the reactor, steam generator, pressurizer, reactor coolant pump, and turbogenerator unit are defined. The overall system is found to be of order 38, and calculational management requires an order reduction. This is accomplished using the Litz method of dominance measures. Order reduction based solely on the location of the eigenvalues in the s plane is also investigated. For the same reduced-order model, the Litz method dominance hierarchy of the plant states seems to make better sense, and unlike the conventional eigenvalue approach it gives accurate results when compared to original system responses. Finally, an overall plant observer is designed based on a seventeenth reduced-order system model. It is based on greatly reduced calculations, thus requiring less hardware, and is a more reliable predictor. View full abstract»

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  • Laser simulation of single-event upset in a p-well CMOS counter

    Publication Year: 1989 , Page(s): 1330 - 1332
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB)  

    A laser illumination method was used to simulate single-event upset (SEU) in a p-well complementary metal-oxide-semiconductor (CMOS) logic circuit. It was found that, unlike the case of the static random access memory (RAM), the sensitivity of a logic circuit to SEU is not necessarily linearly dependent on the supply voltage and that its maximum hardness is achieved at the lower end of the voltage operating range. It is concluded that even though its greatest potential lies in the area of wafer-level hardness assurance the pulsed laser technique can also be used to assess changes in circuit design that have been implemented to increase SEU hardness. View full abstract»

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  • Amplifier with time-invariant trapezoidal shaping and shape-sensitive pileup rejector for high-rate spectroscopy

    Publication Year: 1989 , Page(s): 1326 - 1329
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB)  

    An amplifier with trapezoidal pulse shaping was developed for high-rate high-energy gamma spectroscopy using NaI(Tl) scintillation detectors. It used a double-delay-line technique for producing a nearly triangular pulse shape combined with a linear circuit for producing a flat-topped pulse. Good energy resolution and short resolution time make this amplifier especially suitable for high-count-rate gamma-ray spectroscopy. To provide a versatile high-performance system, it includes a pileup rejector based on inspection of a pileup signal obtained by combining the slow output signal and fast-shaped input signal. The trapezoidal shape provides a short resolution time for minimal occurrence of pileup with a width suitable for presentation to a standard multichannel analyzer. The performance of the system was tested, and the results are presented. View full abstract»

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Aims & Scope

IEEE Transactions on Nuclear Science focuses on all aspects of the theory and applications of nuclear science and engineering, including instrumentation for the detection and measurement of ionizing radiation; particle accelerators and their controls; nuclear medicine and its application; effects of radiation on materials, components, and systems; reactor instrumentation and controls; and measurement of radiation in space.

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