[en] Short note

[en] An R ampersand D RF cavity production and test program is underway to evaluate the practicality of superconducting RF cavity systems for future linear collider applications in the 500 GeV energy region. An international collaboration organized by DESY is assembling a TESLA test facility to assess gradient, systems, and manufacturing cost issues of the superconducting RF collider option. Construction of a state of the art cavity processing facility is underway. It is proposed to build four 12 m long cryounits each with eight 9-cell superconducting cavities operating at 1.3 GHz. Two 4.5 Mwatt, 2 msec pulse length klystrons will distribute power to the total 32 cavities. An electron gun and injector section will be included in this test facility, and beam tests with energies of about 500 MeV will be carried out

[en] This paper describes an automated procedure for testing the high-power klystron amplifiers used in the Ground Test Accelerator (GTA). To verify klystron performance, the authors have developed an automated test system using data-acquisition and control programs based on LabVIEW trademark, a program that can communicate with both an Allen-Bradley PLC5/15 controller over RS232 interface and with other devices that use the GPIB interface. Three automated tests were developed and performed on the high-power klystron: swept-frequency, power-transfer, and VSWR. This paper describes the tests performed, presents test data on the GTA klystrons, provides block diagrams of the automated test facility, and characterizes all the capabilities for the automated test system. This test facility is being used by the GTA program to fully characterize the klystron amplifiers before they are commissioned

[en] Highlights: • The role of scaling analysis in EMDAP and BEPU is presented. • An application of scaling analysis for design of an integral effects test facility is presented. • Possible criteria to establish important phenomena and evaluate distortions between the models and prototypes for one complex postulated accident scenario are presented. • Scaling analysis can support the evaluation model development and assessment process and help to evaluate uncertainties. • Scaling analysis can be an integral part of the evaluation model and help to identify needed code improvements. - Abstract: The role of scaling analysis in Evaluation Model Development and Assessment Process (EMDAP) and Best Estimate Plus Uncertainty (BEPU) is presented. An application of scaling analysis for design and development of an integral effects test facility is used as an example. The discussion of the possible criteria to establish important phenomena and evaluate distortions between the models and prototypes for one complex postulated accident scenario consisting of multiple events (and time sequences between them) is presented. It was concluded that scaling analysis can support the evaluation model development and assessment process and help to evaluate uncertainties by quantifying and ranking effects of various identified phenomena. Also, the scaling analysis can be an integral part of the evaluation model (which is under the development) and help to identify needed code improvements.

[en] A cryopump as ITER primary vacuum pump is being developed at FZK under the European fusion technology programme. The ITER vacuum system comprises of 16 cryopumps operating in a cyclic mode which fulfills the vacuum requirements in all ITER operation modes. Prior to the construction of a prototype cryopump, the concept is tested on a reduced scale model pump. To test the model pump, the TIMO facility is being built at FZK in which the model pump operation under ITER environmental conditions, except for tritium exposure, neutron irradiation and magnetic fields, can be simulated. The TIMO facility mainly consists of a test vessel for ITER divertor duct simulation, a 600 W refrigerator system supplying helium in the 5 K stage and a 30 kW helium supply system for the 80 K stage. The model pump test programme will be performed with regard to the pumping performance and cryogenic operation of the pump. The results of the model pump testing will lead to the design of the full scale ITER cryopump. (orig.)

No abstract available

[en] The processing of Integral Fast Reactor (IFR) metal fuel utilizes pyrochemical fuel reprocessing steps. These steps include separation of the fission products from uranium and plutonium by electrorefining in a fused salt, subsequent concentration of uranium and plutonium for reuse, removal, concentration, and packaging of the waste material. Approximately two years ago a facility became operational at Argonne National Laboratory-Illinois to establish the chemical feasibility of proposed reprocessing and consolidation processes. Sensitivity of the pyroprocessing melts to air oxidation necessitated operation in atmosphere-controlled enclosures. The Integral Fast Reactor Fuels Reprocessing Laboratory is described

[en] This Tritium Research Laboratory Cleanup and Transition Project Final Report provides a high-level summary of this project's multidimensional accomplishments. Throughout this report references are provided for in-depth information concerning the various topical areas. Project related records also offer solutions to many of the technical and or administrative challenges that such a cleanup effort requires. These documents and the experience obtained during this effort are valuable resources to the DOE, which has more than 1200 other process contaminated facilities awaiting cleanup and reapplication or demolition

[en] Target concepts for the National Ignition Facility (NIF) require progress in the art and science of target fabrication. Three distinct issues are addressed: beryllium fuel capsules, foam-buffered direct drive, and high-density gas-filled hohlraums. In all cases experiments on the existing Nova laser at LLNL are either in progress or planned for the near future to test the various concepts. Consequently, target fabrication must be able to deliver targets appropriate for each

No abstract available