OBSERVATIONS OF THE QUADRUPOLAR OSCILLATIONS AT GSI SIS-18

Quadrupolar or beam envelope oscillations give valuable information about the injection matching and the incoherent space charge tune shift. An asymmetric capacitive pick-up was installed at GSI SIS-18 to measure these oscillations. In this contribution, we present the simulations performed to estimate the sensitivity of the quadrupolar pick-up to the beam quadrupolar moment and compare it with respect to other pick-up types installed at SIS-18. Further, dedicated beam measurements are performed to interpret the quadrupolar signal under high intensity conditions.