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[en] The ongoing study of charm production at Hermes as a mean to probe the spin distribution ΔG(x) of the gluons inside the nucleon is briefly reviewed. First results on the search for J/ψ decaying to e+e- and μ+ μ- and a preliminary measurement of the J/ψ electroproduction cross section are presented. Finally an overview is given on present and future upgrades of the Hermes detector to enhance charm detection
Journal
No abstract available
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195; 
; CODEN VDPEAZ; v. 35(3); p. 253
; CODEN VDPEAZ; v. 35(3); p. 253
No abstract available
Source
Doerr, W. (ed.); Technische Universitaet Dresden (Germany). Medizinische Fakultaet ''Carl Gustav Carus''; 75 p; ISBN 3-00-004964-9; ; 1999; p. 15; 3. annual meeting of the German Society for Biological Radiation Research; Dresden (Germany); 29 Sep - 1 Oct 1999; Available from TIB Hannover
; 1999; p. 15; 3. annual meeting of the German Society for Biological Radiation Research; Dresden (Germany); 29 Sep - 1 Oct 1999; Available from TIB Hannover
[en] A new flexible antenna system has been designed for TEXTOR which can be operated in the 'conjugated T' mode. This mode of operation foreseen for the new JET-EP antenna is characterised by its insensitivity to the variations of the antenna plasma loading resistance. By optimising the 'conjugated T' mode, a VSWR at the generator lower than 1.1 can be maintained for an antenna distributed loading resistance varying between 2.5 and 9.5 Ohm/m (or <1.5 between 0.8 and 16 Ohm/m)
Journal
[en] This paper summarizes the design and implementation of an ICRF system for ITER capable of radiating 20 MW and matched to the power source outside the machine vacuum. The key points are the absence of in-vessel remotely operated parts, the ELM resilient conjugate-T matching through conventional line stretchers, the possibility to modify the tuning layout without breaking the machine vacuum and the reduction of the number of matching circuits to four
Journal
No abstract available
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195; ; CODEN VDPEAZ; v. 40(5); p. 81
; CODEN VDPEAZ; v. 40(5); p. 81
[en] Experiments have been performed with the free-electron maser (FEM) at Rijnhuizen, a high-power mm-wave source. A unique feature of the FEM is the possibility to tune the frequency over the entire range from 130 to 260 GHz at an output power exceeding 1 MW. In the so-called inverse set-up, where the electron gun is mounted inside the high-voltage terminal, a peak power of 730 kW was measured at 200 GHz and of 350 kW at 167 GHz . Furthermore, we made the design work to extend the pulse-length to 1 s. Detailed thermal behavior of the critical components is studied. Both the cavity mirrors and the depressed-collector electrodes seem to have adequate cooling
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