Effect of laser-induced damage on the National Ignition Facility optical design (Abstract Only)

1999 ◽  
Author(s):  
Jeffrey A. Paisner
Keyword(s):  
Optical Design ◽  
National Ignition Facility ◽  
Laser Induced Damage

scholarly journals National Ignition Facility small optics laser-induced damage and photometry measurements program

1999 ◽  
Author(s):  
Lynn M. Sheehan ◽  
James L. Hendrix ◽  
Colin L. Battersby ◽  
Stan Oberhelman
Keyword(s):  
National Ignition Facility ◽  
Laser Induced Damage

scholarly journals Modeling of laser-induced damage and optic usage at the National Ignition Facility

2016 ◽  
Author(s):  
Zhi M. Liao ◽  
Mike Nostrand ◽  
Wren Carr ◽  
Jeff Bude ◽  
Tayyab I. Suratwala
Keyword(s):  
National Ignition Facility ◽  
Laser Induced Damage

Optical design of the National Ignition Facility main laser and switchyard/target area beam transport systems

1999 ◽  
Author(s):  
John L. Miller ◽  
R. Edward English, Jr. ◽  
Ronald J. Korniski ◽  
J. Michael Rodgers
Keyword(s):  
Optical Design ◽  
Transport Systems ◽  
Target Area ◽  
Beam Transport ◽  
National Ignition Facility

scholarly journals Clean Construction Protocol for the National Ignition Facility Beampath and Utilities

2003 ◽  
Vol 46 (1) ◽  
pp. 85-97 ◽  
Author(s):  
Stanley Sommer ◽  
Irving Stowers ◽  
David Van Doren
Keyword(s):  
Inertial Confinement Fusion ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Inertial Confinement ◽  
National Ignition Facility ◽  
Optical Components ◽  
Stewardship Program ◽  
Utility Systems ◽  
Class 1 ◽  
Laser Induced Damage

When the stadium-size National Ignition Facility (NIF) is fully operational at the Lawrence Livermore National Laboratory (LLNL), its 192 laser beams will deliver 1.8 megajoules (500 terawatts) of energy onto a target to create extremely high temperatures and pressures for inertial confinement fusion research as part of the Stockpile Stewardship Program. Due to the performance threshold and requirements of the NIF optical components, the optics and their surrounding beampath as well as the supporting utility systems must be fabricated, cleaned, assembled, and commissioned for precision cleanliness. This paper will provide an overview of the NIF cleanliness requirements, the Clean Construction Protocol (CCP) specifications for the beampath and clean utilities, and techniques for verifying the CCP specifications. The NIF cleanliness requirements define limits for molecular and particulate contamination. The goal of these limits is to prevent contamination of optical components. To prevent laser-induced damage and poor laser quality in the optical components, requirements for cleaning, assembly, installation, and commissioning in terms of particle and nonvolatile residue (NVR) levels are defined. The airborne cleanliness requirements in the interior of the beampath are Class 1 (ISO Class 3) particulate levels and a few parts-per-billion (ppb) airborne molecular contamination (AMC) (SEMI F21-95 MC-1,000). To achieve the cleanliness requirements for the beampath interior, a graded CCP approach is used as the NIF beampath and utilities are being constructed by a partnership between LLNL and the construction contractor, Jacobs Facilities Inc. (JFI) in a stadium-size Class 100,000 (ISO Class 8) building. Installation of the beampath components utilizes localized mini-environments of Class 100 (ISO Class 5) or better, with budgets of cleanliness exposure or "class-hours" for each clean connection. Garment, equipment, and operational considerations are evaluated with process verification. Verification of the beampath and utility cleanliness is performed with cleanliness exposure monitoring, evaluating particulates with "swipes" and the LLNL-developed Precision Cleanliness Verification System (PCVS), and measuring nonvolatile residues (NVRs) and AMCs with analytical chemistry techniques. Cleanliness verification results demonstrate that the CCP specifications are achieving the NIF cleanliness requirements for the beampath and clean utilities.

Use of the Magnetostatic Analogue In Electromagnetic Lens Engineering

1970 ◽  
Vol 28 ◽  
pp. 360-361
Author(s):  
John W. Coleman
Keyword(s):  
Boundary Conditions ◽  
High Performance ◽  
Force Fields ◽  
Optical Design ◽  
Direct Conversion ◽  
Design Engineering ◽  
Design Data ◽  
Scalar Potentials ◽  
Geometric Elements ◽  
At Will

In the design engineering of high performance electromagnetic lenses, the direct conversion of electron optical design data into drawings for reliable hardware is oftentimes difficult, especially in terms of how to mount parts to each other, how to tolerance dimensions, and how to specify finishes. An answer to this is in the use of magnetostatic analytics, corresponding to boundary conditions for the optical design. With such models, the magnetostatic force on a test pole along the axis may be examined, and in this way one may obtain priority listings for holding dimensions, relieving stresses, etc..The development of magnetostatic models most easily proceeds from the derivation of scalar potentials of separate geometric elements. These potentials can then be conbined at will because of the superposition characteristic of conservative force fields.

UHV-TEM studies of laser-induced damage

1991 ◽  
Vol 49 ◽  
pp. 632-633
Author(s):  
T.S. Savage ◽  
R. Ai ◽  
D. Dunn ◽  
L.D. Marks
Keyword(s):  
Surface Science ◽  
Rapid Heating ◽  
Local Heating ◽  
Routine Practice ◽  
Transmission Electron ◽  
Northwestern University ◽  
Laser Induced Damage ◽  
Set Up ◽  
Focusing Lens ◽  
Diffusion Of Impurities

The use of lasers for surface annealing, heating and/or damage has become a routine practice in the study of materials. Lasers have been closely looked at as an annealing technique for silicon and other semiconductors. They allow for local heating from a beam which can be focused and tuned to different wavelengths for specific tasks. Pulsed dye lasers allow for short, quick bursts which can allow the sample to be rapidly heated and quenched. This short, rapid heating period may be important for cases where diffusion of impurities or dopants may not be desirable.At Northwestern University, a Candela SLL - 250 pulsed dye laser, with a maximum power of 1 Joule/pulse over 350 - 400 nanoseconds, has been set up in conjunction with a Hitachi UHV-H9000 transmission electron microscope. The laser beam is introduced into the surface science chamber through a series of mirrors, a focusing lens and a six inch quartz window.

Mass distribution of hydrodynamic jets produced on the national ignition facility

2006 ◽  
Vol 133 ◽  
pp. 107-110 ◽  
Author(s):  
B. E. Blue ◽  
S. V. Weber ◽  
D. T. Woods ◽  
M. J. Bono ◽  
S. N. Dixit ◽  
...  
Keyword(s):  
Mass Distribution ◽  
National Ignition Facility
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