Short pulse lasers for generation of fields exceeding 100 MG
We consider the use of intense, short-pulse lasers for generation of ultra-high magnetic fields. 20 MG-level fields were observed in C0[sub 2] laser-illuminated targets, however the recent development of Nd glass lasers capable of delivering several Joules in [approx] 1 ps at intensities > 10[sup 18] W/cm[sup 4] opens the possibility of much higher magnetic fields (B > 100 MG). Magnetic field generation is associated with the efficient production of energetic electrons at high values of intensity x wavelength[sup 2], I[lambda][sup 2]. I[lambda] is proportional to the square of the oscillating momentum of electronsin the laser EM field. For I[lambda][sup 2] > 10[sup 17] W/cm[sup 2]-[mu]m[sup 2], the electron motion becomes nonlinear and most of the absorbed energy appears as hot'' electrons. The absorption of laser energy has been observed to be [approx] 50% at 10[sup 18] W/cm[sup 2]-[mu]m[sup 2] and is predicted to the same or higher at 10[sup 19] W/cm[sup 2]-[mu]m[sup 2]. The hot electron temperature is much. greater thanbackground temperatures and approaches the oscillatory energy at high I[lambda][sup 2]. The new short pulse lasers reach high values of I[lambda][sup 2] at much higher intensity and energy density than long wavelength C0[sub 2] lasers, which should lead to higher magnetic fields.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6545934
- Report Number(s):
- UCRL-JC-111540; CONF-921133-19; ON: DE93013346
- Resource Relation:
- Conference: 6. international conference on megagauss magnetic field generation and related topics, Albuquerque, NM (United States), 9-12 Nov 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
LASER RADIATION
ENERGY ABSORPTION
MAGNETIC FIELDS
SYNTHESIS
CARBON DIOXIDE
COMPUTERIZED SIMULATION
LASER-PRODUCED PLASMA
MAGNETIC CONFINEMENT
MAGNETIC FIELD CONFIGURATIONS
NEODYMIUM LASERS
PINCH EFFECT
PULSES
TARGETS
ABSORPTION
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CONFINEMENT
ELECTROMAGNETIC RADIATION
LASERS
OXIDES
OXYGEN COMPOUNDS
PLASMA
PLASMA CONFINEMENT
RADIATIONS
SIMULATION
SOLID STATE LASERS
SORPTION
700412* - Magnetic Confinement Devices- (1992-)
661300 - Other Aspects of Physical Science- (1992-)