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Monitor for the carbon and oxygen impurities in the ASDEX Upgrade tokamak (1996)

Neu, R. ; Asmussen, K. ; Fussmann, G. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 67 (1996), S. 1829-1833

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: A Bragg spectrometer for monitoring impurity radiation of hydrogenlike carbon and oxygen at the tokamak ASDEX Upgrade is presented. The use of fast multistrip proportional counters allows soft x-ray photon counting with count rates above 1 MHz in a simple arrangement. The absolute calibration was performed using a large area x-ray tube with a LiF anode. The concentrations of both impurities are calculated using the coronal model both for ionization and electron impact excitation. The results of the measurements concerning the long term behavior before and after conditioning of the torus walls by boronization as well as the fast plasma processes are presented. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1147522

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Cold deformed fission in232U(n, f) and239Pu(n, f) (1992)

Kaufmann, J. ; Mollenkopf, W. ; Gönnenwein, F. ; [et al.]

Springer

The European physical journal 341 (1992), S. 319-326

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ISSN: 1434-601X

Keywords: 25.85.Ec

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Masses, charges and kinetic energies of light fission fragments from the reactions232U(n, f) and239Pu(n, f) induced by thermal neutrons have been measured on the Cosi fan tutte spectrometer of the Institut Laue-Langevin in Grenoble. Both at very high and very low kinetic energies marked fine structures in the mass yields and odd-even staggerings in the charge yields are observed. In the framework of a scission point model the results are shown to point to compact and deformed scission configurations, respectively, where at scission the fragments carry no intrinsic excitation energy. The two limiting processes may, therefore, be called cold compact fission (usually known as cold fission) and cold deformed fission. The latter process as a general phenomenon of low energy fission has come into focus only recently.