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Overtaking collision effects in a cw double-pass proton linac

机译：在连续双程质子直线加速器中超越碰撞效应

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The recirculating superconducting proton linac has the advantage of reducing the number of cavities in the accelerator and the corresponding construction and operational costs. Beam dynamics simulations were done recently in a double-pass recirculating proton linac using a single proton beam bunch. For continuous wave (cw) operation, the high-energy proton bunch during the second pass through the linac will overtake and collide with the low-energy bunch during the first pass at a number of locations of the linac. These collisions might cause proton bunch emittance growth and beam quality degradation. In this paper, we study the collisional effects due to Coulomb space-charge forces between the high-energy bunch and the low-energy bunch. Our results suggest that these effects on the proton beam quality would be small and might not cause significant emittance growth or beam blowup through the linac. A 10 mA, 500 MeV cw double-pass proton linac is feasible without using extra hardware for phase synchronization.
机译：循环的超导质子直线加速器的优点是减少了加速器中空腔的数量以及相应的构造和运行成本。最近，使用单个质子束束在双程循环质子直线加速器中进行了束动力学模拟。对于连续波（cw）操作，在第二次通过直线加速器的过程中，高能质子束将在直线加速器的多个位置处超车，并在第一次通过时与低能量束发生碰撞。这些碰撞可能导致质子束发射率增加和束质量下降。在本文中，我们研究了高能束和低能束之间库仑空间电荷力引起的碰撞效应。我们的结果表明，这些对质子束质量的影响很小，并且可能不会导致明显的发射率增长或穿过直线加速器的束爆。 10 mA，500 MeV cw的双通质子直线加速器是可行的，无需使用额外的硬件进行相位同步。

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