  Fermilab Booster synchrotron requires an intensity upgrade from 4.5x1012 to
6.5x1012 protons per pulse as a part of Fermilab's Proton Improvement Plan-II
(PIP-II). One of the factors which may limit the high-intensity performance is
the fast transverse instabilities caused by electron cloud effects. According
to the experience in the Recycler, the electron cloud gradually builds up over
multiple turns inside the combined function magnets and can reach final
intensities orders of magnitude greater than in a pure dipole. Since the
Booster synchrotron also incorporates combined function magnets, it is
important to measure the presence of electron cloud. The presence or apparent
absence of the electron cloud was investigated using two different methods:
measuring bunch-by-bunch tune shift by changing the bunch train structure at
different intensities and propagating a microwave carrier signal through the
beampipe and analyzing the phase modulation of the signal. This paper presents
the results of the two methods and corresponding simulation results conducted
using PyECLOUD software.
