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ICFA Second Generation Plasma Acceleration Workshop

Name: ICFA Second Generation Plasma Acceleration Workshop

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Date: 1998-01-01

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Created at: Fri Jul 27 23:53:35 -0700 2007

Updated at: Fri Sep 02 13:30:21 -0700 2016

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6 papers from the conference:

title: Second generation beatwave experiments at UCLA
format: conference proceeding
conference: ICFA Second Generation Plasma Acceleration Workshop
year: 1998
5 authors: C. E. Clayton | C. Joshi | K. A. Marsh | C. Pellegrini | J.B. Rosenzweig
abstract: The NEPTUNE laboratory, under construction at UCLA, will be a user facility for exploring concepts useful for advanced accelerators. The primary programmatic goal for the laboratory is to inject extremely high-quality electron bunches into a laser-driven plasma beat wave accelerator and explore ideas for extracting a high-quality Delta E/E<0.1, epsilon <10 pi mm mrad, high-energy (100 MeV) beam from a plasma structure operating at about 1 THz and about 3 GeV/m. The lab will combine an upgraded MARS CO_2 laser and the state-of-the-art SATURNUS RF gun and linac, also undergoing an upgrade. The new MARS laser will be about 1 TW (100 J, 100 ps), up from 0.2 TW (70 J, 350 ps). This allows for doubling the spot size of the laser beam and thereby quadrupling the interaction length while still driving gradients of 3 GeV/m. The large diameter of the accelerating structure relative to the injected electron bunches (10:1 ratio) will minimize the deleterious effects of the radial dependence of the accelerating field and soften the radial focusing thus permitting, in principle, the extraction of a high-quality accelerated beam.
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title: Bunch length measurement of picosecond electron beams from a photoinjector using coherent transition radiation
format: conference proceeding
conference: ICFA Second Generation Plasma Acceleration Workshop
year: 1998
6 authors: A. Murokh | J.B. Rosenzweig | M. Hogan | Suk, H. | G. Travish | U. Happek
abstract: The bunch length of an electron beam derived from the UCLA Saturnus photoinjector has been measured using a 45 degrees CTR foil. The sudden change of electrons boundary conditions cause them to radiate (transition radiation) with the spectral power entirely dependent upon the degree of coherency, which strongly relates to the beam size. A polarizing Michelson interferometer allowed measurement of the auto-correlation of the coherent transition radiation signal. An analysis method was developed to compensate for undetected low-frequency radiation and systematically extract the bunch length information for a specific beam model. This analysis allowed observation of pulse lengthening due to the space charge, as well as compression with the variation of the RF injection phase. The hypothesis of a satellite beam has been also tested using this analysis. (8 References).
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title: Characterization of plasma accelerators with RF linac terminology
format: conference proceeding
conference: ICFA Second Generation Plasma Acceleration Workshop
year: 1998
3 authors: A. Ogata | J.B. Rosenzweig | M. Ferrario
abstract: The physics of plasma acceleration is described by using RF linac terminology such as shunt impedance, filling time, transit time factor, etc. It is shown that some differences between conventional RF accelerators and plasma accelerators make it difficult to import the RF linac terminology directly into the new field. For example, the shunt impedance is of limited use and the filling time is no use in wake-field accelerators with single-drive beams or single-pump pulses. The beatwave accelerator, a driven oscillator system, has in a sense more similarity to RF linacs than wake-field accelerators. It was shown that plasma wave decay due to collisions and modulational instability seriously deteriorate the quality factor. (26 References).
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title: The Neptune photoinjector
format: conference proceeding
conference: ICFA Second Generation Plasma Acceleration Workshop
year: 1998
12 authors: J.B. Rosenzweig | S. Anderson | K. Bishofberger | X. Ding | A. Murokh | C. Pellegrini | Suk, H. | A. Tremaine | C. Clayton | C. Joshi | Marsh, K. | P. Muggli
abstract: The RF photoinjector in the Neptune advanced accelerator laboratory, along with associated beam diagnostics, transport and phase-space manipulation techniques are described. This versatile injector has been designed to produce short-pulse electron beams for a variety of uses: ultra-short bunches for injection into a next-generation plasma beatwave acceleration experiment, space-charge dominated beam physics studies, plasma wake-field acceleration driver, plasma lensing, and free-electron laser microbunching techniques. The component parts of the photoinjector, the RF gun, photocathode drive laser systems, booster linac, RF system, chicane compressor, beam diagnostic systems, and control system, are discussed. The present status of photoinjector commissioning at Neptune is reviewed, and proposed experiments are detailed. (33 References).
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title: Towards a plasma wake-field acceleration-based linear collider
format: conference proceeding
conference: ICFA Second Generation Plasma Acceleration Workshop
year: 1998
5 authors: J.B. Rosenzweig | N. Barov | A. Murokh | E. Colby | P. Colestock
abstract: A proposal for a linear collider based on an advanced accelerator scheme, plasma wake-field acceleration in the extremely nonlinear regime, is discussed. In this regime, many of the drawbacks associated with preservation of beam quality during acceleration in plasma are mitigated. The scaling of all beam and wake parameters with respect to plasma wavelength is examined. Experimental progress towards high-gradient acceleration in this scheme is reviewed. We then examine a linear collider based on staging of many modules of plasma wake-field accelerator, all driven by a high average current, pulse compressed, RF photoinjector-fed linac. Issue of beam lending, efficiency, optimized stage length, and power efficiency are discussed. A proof-of-principle experimental test of the staging concept at the Fermilab test facility is discussed.
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title: Injection and dynamics of accelerated beams
format: conference proceeding
conference: ICFA Second Generation Plasma Acceleration Workshop
year: 1998
1 author: J.B. Rosenzweig
abstract: This paper is a summary of the discussions undertaken by the working group on injection and accelerated beam dynamics at the 1st ICFA novel and advanced accelerator workshop on second generation plasma accelerators. The second generation of work on plasma accelerators is aimed to bring the accelerated beams up to the quality needed for applications such as high-energy physics linear colliders. To begin, first generation, or proof-of-principle, experiments and concepts were reviewed. To map the work needed in the second generation of development, the demands of the applications were examined, and an improved framework for discussing the viability of plasma accelerators was constructed. In particular, the issues scaling applications to the short wavelengths characteristic of plasma accelerators was discussed, as was the appropriate characterization of the beam quality in these devices, and the connection between plasma accelerator and conventional accelerator design. Within this framework, the working group discussed electron sources and injectors, the effects of drive beam evolution on accelerated beam dynamics, this effects of nonlinear plasma wave fields on beam phase space, stochastic processes, spatial and temporal beam-plasma wave matching, and future second-generation experimental goals and techniques.
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