Studies of Proton Driven Plasma Wakefield Acceleration - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Studies of Proton Driven Plasma Wakefield Acceleration write by Yangmei Li. This book was released on 2020-07-15. Studies of Proton Driven Plasma Wakefield Acceleration available in PDF, EPUB and Kindle. This thesis focuses on a cutting-edge area of research, which is aligned with CERN's mainstream research, the "AWAKE" project, dedicated to proving the capability of accelerating particles to the energy frontier by the high energy proton beam. The author participated in this project and has advanced the plasma wakefield theory and modelling significantly, especially concerning future plasma acceleration based collider design. The thesis addresses electron beam acceleration to high energy whilst preserving its high quality driven by a single short proton bunch in hollow plasma. It also demonstrates stable deceleration of multiple proton bunches in a nonlinear regime with strong resonant wakefield excitation in hollow plasma, and generation of high energy and high quality electron or positron bunches. Further work includes the assessment of transverse instabilities induced by misaligned beams in hollow plasma and enhancement of the wakefield amplitude driven by a self-modulated long proton bunch with a tapered plasma. This work has major potential to impact the next generation of linear colliders and also in the long-term may help develop compact accelerators for use in industrial and medical facilities.
Plasma Wakefield Acceleration of an Intense Positron Beam
Plasma Wakefield Acceleration of an Intense Positron Beam - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Plasma Wakefield Acceleration of an Intense Positron Beam write by . This book was released on 2004. Plasma Wakefield Acceleration of an Intense Positron Beam available in PDF, EPUB and Kindle. The Plasma Wakefield Accelerator (PWFA) is an advanced accelerator concept which possess a high acceleration gradient and a long interaction length for accelerating both electrons and positrons. Although electron beam-plasma interactions have been extensively studied in connection with the PWFA, very little work has been done with respect to positron beam-plasma interactions. This dissertation addresses three issues relating to a positron beam driven plasma wakefield accelerator. These issues are (a) the suitability of employing a positron drive bunch to excite a wake; (b) the transverse stability of the drive bunch; and (c) the acceleration of positrons by the plasma wake that is driven by a positron bunch. These three issues are explored first through computer simulations and then through experiments. First, a theory is developed on the impulse response of plasma to a short drive beam which is valid for small perturbations to the plasma density. This is followed up with several particle-in-cell (PIC) simulations which study the experimental parameter (bunch length, charge, radius, and plasma density) range. Next, the experimental setup is described with an emphasis on the equipment used to measure the longitudinal energy variations of the positron beam. Then, the transverse dynamics of a positron beam in a plasma are described. Special attention is given to the way focusing, defocusing, and a tilted beam would appear to be energy variations as viewed on our diagnostics. Finally, the energy dynamics imparted on a 730 [mu]m long, 40 [mu]m radius, 28.5 GeV positron beam with 1.2 x 101° particles in a 1.4 meter long 0-2 x 1014 e−/cm3 plasma is described. First the energy loss was measured as a function of plasma density and the measurements are compared to theory. Then, an energy gain of 79 ± 15 MeV is shown. This is the first demonstration of energy gain of a positron beam in a plasma and it is in good agreement with the predictions made by the 3-D PIC code. The work presented in this dissertation will show that plasma wakefield accelerators are an attractive technology for future particle accelerators.
Experimental Study of Laser-driven Electron and Proton Acceleration
Experimental Study of Laser-driven Electron and Proton Acceleration - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Experimental Study of Laser-driven Electron and Proton Acceleration write by Salima Abuazoum. This book was released on 2012. Experimental Study of Laser-driven Electron and Proton Acceleration available in PDF, EPUB and Kindle. This thesis addresses two important topics in the field of laser-driven plasma accelerators. Firstly, the research investigates the generation of relativistic electron beams through laser-wakefield acceleration (LWFA) by applying novel tapered capillary discharge waveguide accelerators, produced by femtosecond laser micromachining. A stable plasma waveguide is formed in a hydrogen-filled capillary driven by an all-solid state high-voltage pulser, specially constructed for this purpose. A longitudinal density taper has been confirmed by measurement of the transverse plasma density profiles at both ends of the waveguide and efficient guiding of low intensity (~1012 W/cm2), ultra-short duration (50 fs) laser pulses is demonstrated. For optimal high-power laser conditions (intensity of 1.6 x 1018 W/cm2), electron beams are produced and compared in positively tapered, negatively tapered and straight capillaries with similar plasma densities of 3-6 x 1018 cm-3 over a length of 4 cm. In all three capillaries, low charge (
Challenges and Goals for Accelerators in the XXI Century
Challenges and Goals for Accelerators in the XXI Century - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Challenges and Goals for Accelerators in the XXI Century write by Oliver Brning. This book was released on 2015. Challenges and Goals for Accelerators in the XXI Century available in PDF, EPUB and Kindle. "The past 100 years of accelerator-based research have led the field from first insights into the structure of atoms to the development and confirmation of the Standard Model of physics. Accelerators have been a key tool in developing our understanding of the elementary particles and the forces that govern their interactions. This book describes the past 100 years of accelerator development with a special focus on the technological advancements in the field, the connection of the various accelerator projects to key developments and discoveries in the Standard Model, how accelerator technologies open the door to other applications in medicine and industry, and finally presents an outlook of future accelerator projects for the coming decades."--Provided by publisher.
Phase Space Dynamics in Plasma Based Wakefield Acceleration
Phase Space Dynamics in Plasma Based Wakefield Acceleration - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Phase Space Dynamics in Plasma Based Wakefield Acceleration write by Xinlu Xu. This book was released on 2020-01-02. Phase Space Dynamics in Plasma Based Wakefield Acceleration available in PDF, EPUB and Kindle. This book explores several key issues in beam phase space dynamics in plasma-based wakefield accelerators. It reveals the phase space dynamics of ionization-based injection methods by identifying two key phase mixing processes. Subsequently, the book proposes a two-color laser ionization injection scheme for generating high-quality beams, and assesses it using particle-in-cell (PIC) simulations. To eliminate emittance growth when the beam propagates between plasma accelerators and traditional accelerator components, a method using longitudinally tailored plasma structures as phase space matching components is proposed. Based on the aspects above, a preliminary design study on X-ray free-electron lasers driven by plasma accelerators is presented. Lastly, an important type of numerical noise—the numerical Cherenkov instabilities in particle-in-cell codes—is systematically studied.
