Published November 15, 2013 | Version v1
Book Metadata-only

Implosion and heating experiments of fast ignition targets by Gekko-XII and LFEX lasers

Creators

  • 1. Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871 (Japan)
  • 2. Nationai Institute for Fusion Science, Toki, Gifu 509-5292 (Japan)
  • 3. Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871 (Japan)
  • 4. Lawrence Livermore National Laboratory, Livermore, CA 94550 (United States)
  • 5. Rutherford Appleton Laboratory, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire OX11 0QX (United Kingdom)
  • 6. York Plasma Institute, Department of Physics, University of York, York YO10 5DQ (United Kingdom)
  • 7. Institute for Laser Technology, Suita, Osaka 565-0871 (Japan)
  • 8. Faculty of Science and Engineering, Setsunan University, Neyagawa, Osaka 572-8508 (Japan)
  • 9. Graduate School of Engineering, University of Fukui, Fukui, Fukui 910-8507 (Japan)
  • 10. Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizu, Kyoto 619-0215 (Japan)

Description

The FIREX-1 project, the goal of which is to demonstrate fuel heating up to 5 keV by fast ignition scheme, has been carried out since 2003 including construction and tuning of LFEX laser and integrated experiments. Implosion and heating experiment of Fast Ignition targets have been performed since 2009 with Gekko-XII and LFEX lasers. A deuterated polystyrene shell target was imploded with the 0.53- μm Gekko-XII, and the 1.053- μm beam of the LFEX laser was injected through a gold cone attached to the shell to generate hot electrons to heat the imploded fuel plasma. Pulse contrast ratio of the LFEX beam was significantly improved. Also a variety of plasma diagnostic instruments were developed to be compatible with harsh environment of intense hard x-rays (γ rays) and electromagnetic pulses due to the intense LFEX beam on the target. Large background signals around the DD neutron signal in time-of-flight record of neutron detector were found to consist of neutrons via (γ,n) reactions and scattered gamma rays. Enhanced neutron yield was confirmed by carefully eliminating such backgrounds. Neutron enhancement up to 3.5 x 107 was observed. Heating efficiency was estimated to be 10-20% assuming a uniform temperature rise model. (authors)

Availability note (English)

Available from doi: http://dx.doi.org/10.1051/epjconf/20135901008

Additional details

Identifiers

DOI
10.1051/epjconf/20135901008;

Publishing Information

Publisher
EDP Sciences
Imprint Place
Les Ulis (France)
ISBN
978-2-7598-1077-2
Imprint Pagination
(v.59) 6 p.

Conference

Title
7. International Conference on Inertial Fusion Sciences and Applications
Acronym
IFSA 2011
Dates
12-16 Sep 2011
Place
Bordeaux (France)

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
45030144
Subject category
S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
Resource subtype / Literary indicator
Conference
Descriptors DEI
BEAMS; ELECTROMAGNETIC PULSES; ELECTRONS; FUELS; GAMMA RADIATION; GOLD; HARD X RADIATION; HEAT; HEATING; IMPLOSIONS; KEV RANGE 01-10; LASERS; NEUTRON DETECTORS; NEUTRONS; PLASMA; POLYSTYRENE; SIGNALS; THERMONUCLEAR IGNITION; TIME-OF-FLIGHT METHOD
Descriptors DEC
BARYONS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ELEMENTS; ENERGY; ENERGY RANGE; FERMIONS; HADRONS; IONIZING RADIATIONS; KEV RANGE; LEPTONS; MATERIALS; MEASURING INSTRUMENTS; METALS; NUCLEONS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; PETROCHEMICALS; PETROLEUM PRODUCTS; PLASTICS; POLYMERS; POLYOLEFINS; POLYVINYLS; PULSES; RADIATION DETECTORS; RADIATIONS; SYNTHETIC MATERIALS; TRANSITION ELEMENTS; X RADIATION

Optional Information

Notes
14 refs