By Satomi Shiraishi
This thesis establishes a thrilling new starting for Laser Plasma Accelerators (LPAs) to additional increase towards the following iteration of compact excessive strength accelerators.
Design, install and commissioning of a brand new experimental setup at LBNL performed a tremendous position and are distinctive via 3 severe parts: e-beam construction, mirrored image of laser pulses with a plasma replicate and big wake excitation under electron injection threshold.
Pulses from a forty TW height energy laser method have been break up right into a 25 TW pulse and a fifteen TW pulse. the 1st pulse used to be used for e-beam construction within the first module and the second one pulse used to be used for wake excitation within the moment module to post-accelerate the e-beam. for that reason, trustworthy e-beam creation and effective wake excitation invaluable for the staged acceleration have been independently demonstrated.
These experiments have laid the root for destiny staging experiments on the forty TW top energy level.
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Additional info for Investigation of Staged Laser-Plasma Acceleration
The basic physics of plasma channel formation in the capillary will be discussed in Sect. 3. More detailed theory and experimental investigations of capillary discharge waveguides are found in [47, 59, 60]. The energy of the e-beam produced by the LPA was measured by a magnetic electron spectrometer . 1 GeV. Electron beam charge was obtained from the phosphor screens which were cross-calibrated against an integrating current transformer. This diagnostic provided charge-density images of the e-beam with energy in one direction and angle in the undispersed plane.
36]. 8) as red triangles as a function of propagation distance. The normalized plasma density is also shown. 5 × 1018 cm−3 and focused 1 mm into the channel as was performed in an experiment. The laser spot size for a high power laser in the channel is smaller than that for the low power laser due to selffocusing. In addition, the trailing edge of the laser pulse often exhibits stronger selffocusing than the leading edge of the pulse. This is because the index of refraction of the plasma is modified on the plasma frequency time scale and not the laser frequency time scale .
7 Maximum electric fields E max in 1-D limit calculated using Eq. 22). E 0 is the cold nonrelativistic wavebreaking field defined by Eq. 1–2), the E max ranges between 1–20 GV/m. In addition, to excite wakefields of a given amplitude at lower n 0 requires a higher a0 laser. 5 × 1018 cm−3 and a0 of 2 while the same amplitude can be excited with a0 of 1 if operated at n 0 ∼ 4 × 1018 cm−3 . The balance between n 0 and a0 influences other effects such as electron dephasing and pump depletion which will be discussed later in this chapter.
Investigation of Staged Laser-Plasma Acceleration by Satomi Shiraishi