This paper discusses and presents the details of the design and implementation of the phase trombone within the PIP-II BTL. The phase trombone serves as an adjustment mechanism, allowing for the fine-tuning of the phase advance between the collimators and the foil, thus optimizing the performance of the collimation process. To achieve this control, a phase trombone is needed within the BTL. The simulation revealed that the precise control of accumulated phase advances between the collimators and the foil was crucial. To ensure the effectiveness of these collimators, simulation was conducted to determine their optical placement within the BTL. floors below transfer storey are smaller than transfer beam about 1015 on average. Special care should be given while designing and detailing the transfer beam. walls and weak coupling beams which follows the capacity design method. ALSO READ: Design of main beam supporting secondary beam with example. These collimators play a vital role in removing large amplitude particles from the beamline that might otherwise miss the horizontal and vertical edge of the foil at the point of the Booster injection. The design of transfer beam is almost similar to that of main beam which is supporting the secondary beam. One crucial aspect of the BTL design involved the implementation of collimators. Xiao (1) and 3 other authors Download PDF Abstract:PIP-II beam transfer line (BTL) to transport the beam from PIP-II Linac to the Booster ring at Fermilab. Download a PDF of the paper titled Phase Trombone Design in the Beam Transfer line for the Project PIP-II at Fermilab, by M.