[en] A CAMAC-compatible digital preprocessor useful for tasks like particle discrimination or data routing is presented. It outperforms its predecessor by doubled computing speed and other improvements. (orig.)

[en] A 433.3 MHz T-junction waveguide circulator with a dummy-load was constructed to isolate the klystron and a linac cavity at the high rf power level of 1 MW. The isolation is -34.9 dB at a low duty factor and it decreases to -23.8 dB at a high duty factor (1%), which shows enough performance for our linac operation. (orig.)

[en] The detection sensitivity of various size germanium detectors to low-level neutron dose equivalent rate is described. Six high-purity germanium detectors with crystal volume of 60 to 120 cm³ were irradiated by neutrons produced from a 0.76 μg²⁵²Cf isotopic neutron source. The counting rate of the prompt gamma rays of 596 keV was used to determine the detecting sensitivities of the detectors. The results show that the detecting sensitivity of the HPGe detector decreases with increasing detector size, and approximately proportional to the crystal volume. (orig.)

[en] We describe a system to measure charge and time of the streamer tube signals developed, in collaboration with CAEN company, for the MARCO experiment. Intensive test in prototype and final production have been performed. Preliminary results are reported. (orig.)

[en] Pulsed sources of X-ray radiation, such as the storage rings associated with synchrotrons, give rise to sequences of sum-peaks in energy-dispersive spectra. These are due to pile-up processes occurring in the solid-state detection system (SSD). The phenomenon is most vivid when the storage ring is operated in single- or few-bunch mode, in which case the interbunch interval T_b is up to an order of magnitude smaller than the pulse processing time T_p of the spectroscopy amplifier. After a summary of basic aspects of SSD the theory of pile-up with synchrotron sources is presented. The effect is strongest when the spectrum contains only one or two strong features. The phenomenon is illustrated with a variety of examples. Experiments which simulate pulsed sources are briefly indicated. These permit evaluation of amplifier parameters that are needed if the theory is to be applied to the deconvolution of spectra in which pile-up rejection circuitry has been used. (orig.)

[en] Some insulating GaAs and CdTe:Cl photoconductor probes were qualified on high energy X-ray single-shot flash generators. The estimated minimum detected dose per flash corresponding to a 230 mrad direct beam attenuated by 200 mm lead was 20 μrad. The dynamic range was about 4 decades in amplitude or charge, with a good linearity. Such detectors, by locating the origin of the parasitic scattered beam, could be used to eliminate this parasitic beam in X-ray flash radiography in detonics experiments. Imaging possibilities are mentioned, as well as X-ray generator monitoring with such detectors or with neutron preirradiated photoconductors. (orig.)

[en] Measurement errors of beam position monitors strongly affect the correction of a beam orbit distortion when the monitors and correctors are placed at inadequate positions. This problem has been studied both with calculations and experiments using the Mitsubishi electron synchrotron, in which the beam at injection has a large size, causing a large measurement error. The synchrotron has an FODO lattice and six cells, and the working point is (ν_x, ν_y) = (2.26, 1.13). The calculations have shown that the effect is strong on the vertical COD correction and weak on the horizontal one. The vertical COD correction is impossible with a measurement error of only 1 mm in the worst case of monitor and corrector positions. A good correction is performed when the monitor and corrector are placed at nearly the same positions in each cell. Beam experiments have been performed for the worst and better cases, and similar results to the calculations have been obtained. (orig.)

[en] The energy resolution for γ-rays and conversion electrons electrons from ²07 Bi has been studied by using a liquid xenon ionization chamber doped with photoionizing dopant TEA. Althought a significant improvement in the resolution is found at a low electric field by doping with TEA, improvement at a high electric field was not observed in marked contrast to a 'δ-ray recombination model'. (orig.)

[en] Short communication

[en] A general relativistic theory of the motion of a charged-particle beam motion along a curved optical axis, including the gravitational field, is of great significance in the design of optimal beam control systems. In a first paper, a new matrix approach was presented. In this second paper the expansion of the most general equations of motion and electromagnetic field equations in the Taylor series in powers of the derivation from the reference particle is presented. The nonlinear equations in phase space are reformulated as linear equations in phase moment space. A compact, conservative, recursive method of integrating the equations of motion is proposed. In some cases it is possible to optimize the control system by choosing a definite symmetry. This symmetry is considered in the paper. (orig.)