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@inproceedings{bhat:hb2021-mop23, author = {C.M. Bhat and N. Eddy}, title = {{Coupled Bunch Instabilities Growth in the Fermilab Booster During Acceleration Cycle}}, % booktitle = {Proc. HB'21}, booktitle = {Proc. 64th Adv. Beam Dyn. Workshop High-Intensity High-Brightness Hadron Beams (HB'21)}, eventdate = {2021-10-04/2021-10-08}, pages = {140--145}, paper = {MOP23}, language = {english}, keywords = {booster, extraction, emittance, injection, acceleration}, venue = {Batavia, IL, USA}, series = {ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams}, number = {64}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {03}, year = {2024}, issn = {2673-5571}, isbn = {978-3-95450-225-7}, doi = {10.18429/JACoW-HB2021-MOP23}, url = {https://jacow.org/hb2021/papers/mop23.pdf}, abstract = {{The Fermilab Booster is an RCS with h=84 and gammaT =5.47 and, during standard operation it accelerates ~4.5E12ppBc from 400 MeV to 8 GeV at 15 Hz. The Booster is being upgraded to handle higher beam intensity >6.7E12ppBc and repetition rate of 20Hz. In the current mode of operation, we perform multi-turn beam injection and capture beam in h=84 system adiabatically. However, we have observed coupled bunch (CB) instabilities in the extracted beam. This issue is expected to worsen at higher beam intensities. In principle, for h=84 one expects 41 modes of oscillations contributing to these CB instabilities. Currently, we have a digital mode damper to mitigate prominent CB modes. We would like to understand at what time in the beam cycle a particular mode is going to originate and how much it contributes at a different time of the cycle. In this regard, we have collected wall current monitor data from injection to extraction and looked for the start of a particular mode of CB instability and its growth for different intensities. This paper presents the results from this study and future plans to mitigate the CB instability in Booster.}}, }