Laser-Plasma Acceleration Research at Berkeley Lab by Carl B Schroeder скачать в хорошем качестве

Laser-Plasma Acceleration Research at Berkeley Lab by Carl B Schroeder

06 March 2017 to 17 March 2017 VENUE: Ramanujan Lecture Hall, ICTS Bangalore Particle accelerators have been instrumental in unraveling some of the deep questions related to matter at the fundamental level, the latest being discovery of the Higgs Boson. The conventional accelerators, however, have reached their limit in terms of size and energy, as acceleration gradients in the state of art accelerators have reached the material breakdown limit (~ MV/cm). A new principle of particle acceleration is desirable at this juncture. A strong candidate for this is the plasma wake field based acceleration (driven by lasers and/or particle beams). This scheme provides a promise of about thousand fold increase in the acceleration gradient (~ GV/cm). Furthermore, plasma being already a broken down medium, does not get adversely effected by such huge electric fields. This paves a way for building table top compact accelerators for electron as well as ion beams which can make crucial contributions to our fundamental understanding of matter and would have applications in many areas such as medical, security, imaging etc. This program will cover a series of pedagogical lectures on the status and future of this new technology. In addition, a focused program on exploring collaborative activities on theoretical aspects of laser-plasma interactions in general (partly supported by the UK-India Newton-Bhabha funds) is also planned. Brain storming discussion sessions to look into possible near and long term challenges in high energy physics would be conducted. Other applications in the field of medical, security and imaging would be discussed. Moreover, looking at the pace of development in laser intensity, possibility of exploring new physics such as radiation reaction effects, pair production etc., in laboratory experiments would soon become a reality. Keeping these excitements in view, a planned activity at national level will be explored. Announcement Students, post docs and young researchers interested in participating in the program may send their CV along with a brief (100 words) statement on their interest in the program by 5th of Feb at the email id: lpa2017@icts.res.in The selection for participation would be conveyed by 10th of Feb. CONTACT US: lpa2017@icts.res.in PROGRAM LINK: https://www.icts.res.in/program/LPA2017 Table of Contents (powered by https://videoken.com) 0:00:00 Start 0:00:10 Laser-Plasma Acceleration Research at Berkeley Lab 0:00:34 Outline 0:02:43 Laser-plasma accelerator (LPA) experimental demonstration of GeV electron beam 0:03:54 Laser-plasma accelerators: compact sources (10 GV/m) of fs e-beams 0:04:48 Limits to energy gain: Diffraction, Dephasing, Depletion 0:07:41 Plasma density scalings 0:10:31 BELLA Laser Facility 0:11:19 Multi-GeV electron acceleration using BELLA 0:12:30 Self-injection from background plasma determines beam quality 0:17:34 Injection: phase velocity control with density gradients 0:21:07 lionization injection 0:23:38 Wakefield amplitude required for ionization trapping 0:25:27 Two-color ionization injection 0:27:15 Two-color ionization injection: method to generate ultra-low emittance beams 0:28:18 Laser-plasma accelerator applications: Radiation generation 0:30:32 Application: Free-electron laser (FEL) 0:31:03 Laser-plasma accelerator beam characteristics 0:31:51 6D brightness comparable to conventional sources: consider phase-space manipulation 0:33:13 FEL with present LPA performance: Beam decompression 0:35:03 Beam Dispersion and transverse gradient undulator for large energy spread acceptance 0:36:44 LPA-driven 4-nm FEL using electron-beam phase space manipulation 0:38:26 LBNL experimental path to FEL lasing: electron beam decompression 0:41:06 High-energy physics application of LPAs 0:43:09 LPA application: Lepton Collider 0:44:28 Quasi-linear regime: positron focusing independent control of acceleration and focusing 0:45:38 Staged LPAs: average gradient determined by driver in- coupling distance 0:47:42 Average power reduced at lower plasma density (Beamstrahlung limits charge/bunch) 0:51:15 Laser-plasma accelerator-based collider concept 0:52:51 Demonstration of acceleration in second independently- powered laser-plasma accelerator at LBNL 0:57:12 Staged LPA: electron spectra vs laser delay 0:58:56 Future LPA staging experiments: 5 GeV + 5 GeV 1:00:40 Conclusions and future directions 1:03:17 Q&A