Abstract. A new type of beam transformer, based on the principle of a CryogenicCurrent Comparator CCC, was built to measure extracted ion beams from the SIS, the heavy ion synchroton at GSI. A current resolution of 0:006 , 0:065 nA= p H z , depending on the frequency range, could be achieved allowing us to measure ion beams with intensities greater than 10 9 particles per second with high accuracy. Numerous investigations were carried out to study the zero drift of the system which shows a strong exponential slope with two time constants. In addition, the in uence of external magnetic elds was measured. Furthermore the microphonic sensistivity o f the system was studied by measuring noise spectra of the detector's vibration and the output signal.Measurements with neon and argon beams will be presented and compared with signals emitted from Secondary Emission Monitors SEM. Another measuring function of the CCC-detector aims at the analysis of the beam's time structure to get information about beam spill uctuations. With an extended bandwidth 0 20 kHz of the detector system it is now possible to compare simulations of extracted beams from synchrotons with measurements of the CCC. MOTIVATION

The weak equivalence principle (WEP) has currently been shown to be valid to an accuracy of . Free-fall experiments over short distances have attained an accuracy of only . Microgravity facilities such as the `Bremen drop tower' enable long-distance free-fall experiments which may improve the accuracy to .

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