No abstract available

[en] The basic frame of the Faraday cup is made in the form of a coaxial waveguide of HF technology in 50 ohm geometry. Both coaxial conductors are at an angle of 90⁰ to the beam at the lower end, away from the suspension. The hollow inner conductor is closed by a tungsten plate towards the beam and is water cooled. The beam capturing device is distinguished by high band width and high thermal capacity. (DG)

[en] The Faraday cup serves to measure the beam current of a heavy ion accelerator. It consists of two cups of Ta emboxed in each other. They have got a conical shape reducing the thermal surface loading caused by the ion current. The cavity between both cups, into which a spiral baffle plate is welded, is cooled by circulating cooling water. The coolant supply and discharge pipes consist of Ta, too, in order to avoid local galvanic cells. The Faraday cup itself is electrically insulated from its casing by means of ceramic spheres. Suppression of secondary particles is achieved by means of electric and magnetic fields. (DG)

[en] Solutions are presented to the first of three benchmark problems that the Pressure Vessel Research Committee (PVRC) included in an international effort to develop comparative bases for various available high-temperature structural analysis methods. This first problem is referred to as the Oak Ridge Pipe Ratchetting Experiment and involves a pipe segment that undergoes repeated thermal transients that are separated by hold periods at an elevated temperature. The other two problems selected by the PVRC are discussed in the next three papers in this publication. A working group within the PVRC Subcommittee on Elevated Temperature Design developed a program plan and the solutions were Elevated Temperature Design developed a program plan and the solutions were solicited from organizations in various countries working in the elevated temperature design area. This paper summarizes the contributed solutions and comments on the comparisons. Both detailed inelastic structural analyses and simplified inelastic analyses were performed. Comparisons with experimental results are also included

[en] The second in the series of three PVRC benchmark problems concerning elevated temperature design analysis technology is presented. The other two problems are presented as companion papers in this publication. This problem is referred to as the Saclay Fluctuating Sodium Level Experiment and the conditions and experimental results were provided by the Commissariat a L'Energie Atomique (CEA) of the Centre D'Etudes Nucleaires (CEN) in Saclay, France. The test involved two large concentric cylindrical vessels with hot sodium filling the space between them to a level that changes with time. The analyses consider up to 100 cycles of fluid oscillation. A total of five analytical solutions were provided to the PVRC using special purpose computer codes and using selected simplified analysis techniques. After being compared with one another, the analytical solutions were then compared with the experimental results

[en] The third in the series of three PVRC benchmark problems concerning elevated temperature design analysis technology is presented. The other two problems are presented in the three preceding papers in this publication. This problem is referred to as the Oak Ridge Nozzle to Sphere Attachment and the conditions, material properties, and a reference analytical solution were provided by the Oak Ridge National Laboratory. The problem involved a circular cylindrical nozzle attached to a hemispherical shell that is subjected to internal pressure, axial nozzle loads, and thermal transients. Detailed finite element solutions and analytical solutions by simplified methods were provided to the PVRC. The results are compiled, summarized, and compared with one another in this paper. Experimental results were not available for comparison. Greater consistency might have been expected between the analytical results, but the geometric approximation made by the analysts were concluded to give conservative predictions

[en] The purpose of this lecture is to show how the spread of impurities or pollution in the air (or more generally, of atmospheric properties) is closely tied to atmospheric flow. This is represented by a great variety of different large movement systems, whose order of magnitude (scale) extends from 10⁴ km down to the mm range. The study of spread processes thus includes the whole of meteorology. A series of examples help to make this clear. (orig.)

[en] An increasing number of applications of scintillators at low temperatures, particularly in cryogenic experiments searching for rare events, has motivated the investigation of scintillation properties of materials over a wide temperature range. This paper provides an overview of the latest results on the study of luminescence, absorption and scintillation properties of materials selected for rare event searches so far. These include CaWO₄, ZnWO₄, CdWO₄, MgWO₄, CaMoO₄, CdMoO₄, Bi₄Ge₃O₁₂, CaF₂, MgF₂, ZnSe and Al₂O₃-Ti. We discuss the progress achieved in research and development of these scintillators, both in material preparation and in the understanding of scintillation mechanisms, as well as the underlying physics. To understand the origin of the performance limitation of self-activated scintillators we employed a semi-empirical model of conversion of high energy radiation into light and made appropriate provision for effects of temperature and energy transfer. We conclude that the low-temperature value of the light yield of some modern scintillators, namely CaWO₄, CdWO₄ and Bi₄Ge₃O₁₂, is close to the theoretical limit. Finally, we discuss the advantages and limitations of different materials with emphasis on their application as cryogenic phonon-scintillation detectors (CPSD) in rare event search experiments. (Abstract Copyright [2010], Wiley Periodicals, Inc.)

[en] Published in summary form only

[en] We have developed a 66-channel SQUID system to read out the detectors for the second phase of the CRESST dark matter search using SQUID sensors, electronics and cryocables supplied by different manufacturers. The system has been extensively tested at Oxford to characterise the sensitivity, bandwidth, slew rate, noise, thermal drift, and crosstalk. By using the SQUID sensors as magnetometers we can confirm the input circuit for the detectors is superconducting, thus ensuring there will be no noise from parasitic resistance. Multichannel SQUID systems have further applications in particle physics experiments, such as precision magnetometry in the search for the neutron electric dipole moment