Batsch F, Muggli P, Agnello R, Ahdida C C, Amoedo Goncalves M C, Andrebe Y, Apsimon O, Apsimon R, Bachmann A-M, Baistrukov M A, Blanchard P, Braunmüller F, Burrows P N, Buttenschön B, Caldwell A, Chappell J, Chevallay E, Chung M, Cooke D A, Damerau H, Davut C, Demeter G, Deubner H L, Doebert S, Farmer J, Fasoli A, Fedosseev V N, Fiorito R, Fonseca R A, Friebel F, Furno I, Garolfi L, Gessner S, Gorgisyan I, Gorn A A, Granados E, Granetzny M, Graubner T, Grulke O, Gschwendtner E, Hafych V, Helm A, Henderson J R, Hüther M, Kargapolov I Yu, Kim S-Y, Kraus F, Krupa M, Lefevre T, Liang L, Liu S, Lopes N, Lotov K V, Martyanov M, Mazzoni S, Medina Godoy D, Minakov V A, Moody J T, Moon K, Morales Guzmán P I, Moreira M, Nechaeva T, Nowak E, Pakuza C, Panuganti H, Pardons A, Perera A, Pucek J, Pukhov A, Ramjiawan R L, Rey S, Rieger K, Schmitz O, Senes E, Silva L O, Speroni R, Spitsyn R I, Stollberg C, Sublet A, Topaloudis A, Torrado N, Tuev P V, Turner M, Velotti F, Verra L, Verzilov V A, Vieira J, Vincke H, Welsch C P, Wendt M, Wing M, Wiwattananon P, Wolfenden J, Woolley B, Xia G, Zepp M, Zevi Della Porta G
Max Planck Institute for Physics, Munich, Germany.
Ecole Polytechnique Federale de Lausanne (EPFL), Swiss Plasma Center (SPC), Lausanne, Switzerland.
Phys Rev Lett. 2021 Apr 23;126(16):164802. doi: 10.1103/PhysRevLett.126.164802.
We use a relativistic ionization front to provide various initial transverse wakefield amplitudes for the self-modulation of a long proton bunch in plasma. We show experimentally that, with sufficient initial amplitude [≥(4.1±0.4) MV/m], the phase of the modulation along the bunch is reproducible from event to event, with 3%-7% (of 2π) rms variations all along the bunch. The phase is not reproducible for lower initial amplitudes. We observe the transition between these two regimes. Phase reproducibility is essential for deterministic external injection of particles to be accelerated.
我们使用相对论性电离前沿为等离子体中长质子束的自调制提供各种初始横向尾场振幅。我们通过实验表明，在有足够的初始振幅[≥(4.1±0.4) MV/m]时，沿束的调制相位在不同事件之间是可重复的，在整个束上均方根变化为2π的3% - 7%。对于较低的初始振幅，相位不可重复。我们观察到了这两种状态之间的转变。相位可重复性对于确定性地外部注入待加速粒子至关重要。
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