Application of SCSI Bus to an On-line Data Acquisition System with RDCs (Ratio to Digital Converters)

An on-line data acquisition system with RDCs has been extended by incorporation of an interface between the KYU-IB bus used exclusively in the original RDC system and the SCSI bus used widely with general purposes. This extension enables us to widen a choice of personal computers and workstations available for the data acquisition with RDCs. A prototype of such RDC data acquisition system was developed and the performance was evaluated through some feasibility tests. The system was successfully applied to nuclear physics experiments in which energy spectra of charged particles emitted from nuclear reactions were measured with a deltaE-E counter telescope consisting of three silicon semiconductor detectors

Ultrasoft X-Ray Generator with Thermal Cathode Electron Gun and its Applications

An X-ray generator with an electron gun of thermal cathode type has been developed. The obtained X-ray yield is compared with those got by a field emission type electron gun used for a long time in our laboratory. It has been concluded that the yield of new X-ray generator of the thermal cathode type is quite larger than that of the field emission type and the ultra accurate position sensing has become possible. And it is tried to extend it to generate pulse X-rays

Angular distributions of atoms sputtered by ion bombarding

The apparatus for measuring angular distributions of atoms sputtered from metals by ion bomberding has been constructed. It has a hollow cathode type ion source, an ion beam focusing system and a target chamber in which a target and collectors of sputtered atoms are set. The angular distributions of the sputtered atoms have been measured using inert gas, copper and silver ions and two metals. A rotating target is used to collect quantitative amounts of atoms for atomic absorption analyses on collectors with a possibly low ion dose, since a high ion dose erodes topographically a target surface probably to affect the angular distributions. It has been observed that the atoms sputtered in the opposite direction to an ion beam incidence decease as the ion dose becomes high and mass ratio of the ion to the target atom increases

Activation Analysis of Some Metals Sticking on a Si-Wafer

The neutron activation analysis was used to identify elements and measure quantitatively the number of metalic atoms sticked on a Si-wafer which was a single crystal of 10 mm×10 mm×0.2 mm. In order to obtain measuring effciencies and limits in the analysis, the metalic samples of V, Fe, Ni and Cu were irradiated by neutrons from a reactor. The γ-rays from the activated samples were analyzed by means of a γ-ray spectrometer connected to a data acquisition and processing system. The limits of detection obtained are 0.2μg for V;500μg, Fe;2μg， Ni;1μg, Cu. These values are valid under the condition that the elements associated with the Siwafer mentioned above are packaged in the bag made of a sheet of polyethylene with 25 mm×50 mm×0.03 mm in size. The predicted values by Currie\u27s formula for the limits of detection are fairly consistent with the experimental ones. It is also found that if the lower values of detection Iimits are desired, further care should be taken to reduce the background resulted dominantly from the γ-rays emitted from ^<24>Na and ^<41>Ar contained in the package bag of polyethylene sheet

パルス波高比デジタル変換器 (RDC) 用データ収集システムへの SCSI バスの応用

An on-line data acquisition system with RDCs has been extended by incorporation of an interface between the KYU-IB bus used exclusively in the original RDC system and the SCSI bus used widely with general purposes. This extension enables us to widen a choice of personal computers and workstations available for the data acquisition with RDCs. A prototype of such RDC data acquisition system was developed and the performance was evaluated through some feasibility tests. The system was successfully applied to nuclear physics experiments in which energy spectra of charged particles emitted from nuclear reactions were measured with a deltaE-E counter telescope consisting of three silicon semiconductor detectors