Attempts to Obtain Highly Resolved Mass Spectra of Short-Lived Fission Products with the Lohengrin Separator
The LOHENGRIN is a large Kaufmann Thomson parabola spectrograph the two fields of which are not superimposed but separated and shaped as sector fields [see fig.1] so that the system focuses stigmatically1). Its field boundaries are curved so that the image aberrations are minimized2). Since it is designed to deflect recoil fission products of about 100 MeV energy which have been stripped of about 20 electrons the dimensions of the system are chosen to be large. With 0.2 T the magnet deflects the fission products on a radius of 4m, while the electrostatic condensor uses ±300KV on its electrodes separated by 30 cm to deflect the fission products on a radius of 5.6 m3). Using a thin layer of 400 µg/cm2 of 235U placed close to the reactor core of th high flux reactor in Grenoble in a neutron flux of about 5.1014 thermal neutrons per cm2 and second, sufficient fission products enter LOHENGRIN, so that at its exit slit over 104 particles of one mass can be recorded per second. The separator has a mass dispersion of 32 mm/ % perpendicular to the exit slit and an energy dispersion of 70 mm/ % parallel to the exit slit. It is designed so that particles whose energies deviate by ±5% from the mean energy pass through the 700 mm long exit slit.
KeywordsFission Product Exit Slit Sector Field Image Carrier High Flux Reactor
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