Speaker
Description
The Fermilab Linac delivers 400 MeV H- beam to the Booster rapid cycling synchrotron. Linac beam is affected by temperature fluctuations in the RF gallery and beam enclosure as well as fluctuations in the ion source output. Being able to track changes in not only the beam centroid, but also emittance and their effect on beam losses is important for improving transmission efficiency and beam quality to downstream machines. The Linac is equipped with a single longitudinal profile monitor (BSM) in the middle. Profile monitors, however, are destructive and slow and cannot be deployed during regular beam operation. Longitudinal emittance calculations based on simulation and BSM measurements are under active development. Work is on-going to model the beam distributions based on profile measurements and RF cavity and magnet conditions. The model will then be used to reconstruct beam phase phase space as accelerator conditions drift to make machine tuning more efficient and reduce beam loss. Additionally, the transfer line to the Booster is equipped qith a bunching cavity for reduction of energy spread at injection. However, unlike other facilities, instrumentation in the Booster injection region is limited. Therefore, the proposed technique for reconstructing the Linac beam phase space at an arbitrary position along the Linac and transfer line can be a uniquely useful way to evaluate the beam distribution without multiple costly scans, and correct it before injection.
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