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Currently, Fermilab Booster accelerates ~4.5E12 protons per pulse (ppp) in 81bunches from 400 MeV to 8 GeV at 15 Hz to provide beam to multiple HEPexperiments and is being upgraded to handle higher beam intensity >6.7E12 pppat a repetition rate of 20 Hz. In the current mode of operation, we controllongitudinal coupled bunch instabilities (LCBI) using combination of passiveand active dampers. The issues with LCBI are expected to worsen at higher beamintensities. Here, we would like to investigate at what time in the beam cyclea particular mode is going to originate and how much it contributes at adifferent time of the acceleration cycle using the collected wall currentmonitor data from injection to extraction. Also, measure growth rates as afunction of beam intensity for some dominant modes. Finally, this paperpresents results from the observed LCBI analysis for the highest available beamintensities, unexpected findings, and future plans to mitigate the LCBI athigher beam intensities

Coupled Bunch Instabilities Growth in the Fermilab Booster during Acceleration Cycle