COMPARISON OF THE CALCULATED NEUTRAL BEAM SHINE THROUGH OF THE WENDELSTEIN VII-A INJECTION WITH CALORIMETRIC MEASUREMENTS
Density profiles of the Wendelstein VII-A plasma as measured by Thomson scattering are used to calculate the temporally and spatially varying power density of the neutral beam shine through on the torus calorimeter for several shot series. The total energy deposited by the three beam species is obtained by integrating the transmitted power density in space and time. This global quantity is compared with the calorimetric measurements routinely performed for each shot. The agreement between calculated and measured energy is found to be DELTAE/E = 2.3+-11 % confirming the error estimation for the NEUDEN program used, which was only slightly modified to calculate the power density transmitted in the target plane. From this good agreement it is concluded that the program contains a realistic beam model and reliable cross-sections for the beam attenuation which is important for further applications. Furthermore, the same comparison was done with old results of the ODIN code by analysing the corresponding raw data as far as they could be recovered, obtaining a similarly good consistency. A possible increase of 10 to 20 % of the beam stopping cross section which could be expected for Wendelstein VII- A conditions by the effect of multistep collision processes as suggested by Boley et al is discussed also.
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP 4/232, 1987
Record Number: 1989126024901 / Last updated on: 1989-01-01
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