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[en] Summary of the discussions of the working group on wake fields in media and structures which met during the workshop on Advanced Accelerator Concepts is given.(AIP) copyright 1989 American Institute of Physics
[en] A transverse-to-longitudinal emittance exchange experiment is in preparation at the Argonne Wakefield Accelerator (AWA). The experiment aims at exchanging a low ((varepsilon)z < 5 (micro)m) longitudinal emittance with a large ((varepsilon)x > 15 (micro)m) transverse horizontal emittance for a bunch charge of ∼100 pC. Achieving such initial emittance partitioning, though demonstrated via numerical simulations, is a challenging task and needs to be experimentally verified. In this paper, we report preliminary emittance measurements of the beam in the transverse and longitudinal planes performed at ∼12 MeV. The measurements are compared with numerical simulations.
[en] The Argonne Wakefield Accelerator (AWA) is a new facility for advanced accelerator research, with a particular emphasis on studies of high gradient (∼100 MeV/m) wakefield acceleration. A novel high current short pulse L-Band photocathode gun and preaccelerator will provide 100 nC electron bunches at 20 MeV to be used as a drive beam, while a second high brightness gun will be used to generate a 5 MeV witness beam for wakefield measurements. The authors will present an overview of the various AWA systems, the status of construction, and initial commissioning results
[en] Complete text of publication follows. With the intense laser entering the relativistic regime for some time, the vision of laser wakefield acceleration has become a reality. With the energy of relativistic laser further increasing, we now envision a regime of greater accelerated energies as well as new regimes of acceleration, including ions. With the 100 J class laser now soon in hand, we foresee multi-staged acceleration reaching beyond 100 GeV, a serious energy threshold. With this class ion acceleration also enters into a new regime where ions too become relativistic and thus monoenergy. We will discuss TeV and PeV laser acceleration in this talk. In addition to laser-based collider possibility (for which we advocate laser development with high efficiency and high repetition rate), we also envision possibility of conducting fundamental physics research based on non-collider approaches. PeV energies will allow us to feel the texture of vacuum. Meanwhile, high intensity fields of laser could excite and resonate with 'vacuum modes', for which we will elaborate. Finally, I will mention some of societal applications that may be derived from these laser technology development spurred by the interest into fundamental physics.
[en] Accelerating particles to high energies with a high-gradient wakefield accelerator may require use of multiple stages. Coupling beams from one stage to another can be difficult due to high divergence and non-negligible energy spreads. We review the challenges, technical requirements and currently proposed methods for solving the staging problem.
[en] In this paper we propose a multi-stage wake field acceleration scheme to overcome the low transformer ratio problem and still provide high accelerating gradients. The idea is very simple. We use a train of several electron bunches from a linear accelerator (main linac) with well defined separations between the bunches (tens of ns) to drive wake field devices. Here we have made the assumption that the wake field devices are available, whether plasma, iris-loaded metallic or dielectric wake field structures. 10 refs
[en] The authors present an initial design of a proof-of-principle experiment on the Laser Wakefield Accelerator (LWFA). The experiment will utilize the NRL Table-Top Terawatt (T3) laser system as the driver for the wakefield in a pulsed-valve gas jet plasma, and a ∼1 MeV Febetron as the electron beam injector. The LWFA will be operated in the self-modulated regime where enhanced acceleration gradients and extended interaction distances can be achieved. Numerical simulations demonstrate that with the present parameters of the T3 laser, peak accelerating gradients can reach >300 GeV/m and single stage energy gain of >100 MeV can be attained
[en] Results on numerical simulation of the wake field excitation in rarefied and dense plasma are presented. Under conditions both the plasma and the bunch nonlinear behavior is observed. Ions for the plasma channel due to their cross-sectional motion in the self-congruent fields