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In this report we describe the measurements performed on the E760 hydrogen Jet Target in order to some of the basic parameters of the system. These measurements were performed in the context of the upgrade program of the target for the successor experiment E835. Fermilab experiment E760 studied charmonium states formed in antiproton-proton annihilations. The antiproton-proton interactions were produced in a jet of hydrogen gas which intersected the antiproton beam coasting in the Fermilab Antiproton Accumulator. The results from E760 have shown that an increase in integrated luminosity by a factor of more than 5 is needed to complete the study of the charmonium spectrum. The E835 experiment is designed to achieve this by increasing the intensity of the antiproton beam and the density of the hydrogen-cluster-jet. This report is concerned with preparations for the work needed to increase the density of the hydrogen-cluster-jet

The E760 Jet Target: Measurements of performance at 77K