The construction of the superconducting linac LISA and the transport line to the 25 MeV spectrometer has been completed in July. The commissioning of the whole machine will be carried on starting in September. The installation of the 25 MeV arc to the undulator will be completed by December. Up to now successfully rf power tests and conditioning of 3 out of 4 modules compousing the superconducting accelerator have been accomplished. Conditioning is to be continued also the improve the present results (\ 4MeV/m at 25% duty cycle) limited by intense X-ray enission. A technique to measure the quality factor Q₀ by on-line LHe level measurement has been devised 1, taking into account the complex behaviour of LHe in the loop-controlled cryogenic system. The peculiarity of this behaviour is the onset of coupled pressure, temperature and density oscillations which make the LHe evaporated mass evaluation a very indirect measurement.
M et al. (Tue,) studied this question.
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