Dr. Andi Klein Profile

Dr. Andi Klein

at Los Alamos National Lab

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 15 September 2014 Paper

Measurement of reaction-in-flight neutrons using thulium activation at the National Ignition Facility

G. Grim, R. Rundberg, M. Fowler, A. Hayes, G. Jungman, M. Boswell, A. Klein, J. Wilhelmy, A. Tonchev, C. Yeamans

Proceedings Volume 9211, 921108 (2014) https://doi.org/10.1117/12.2066249

KEYWORDS: National Ignition Facility, Thulium, Sensors, Plasma, Fusion energy, Ions, Particles, Diagnostics, Crystals, Gold

Read Abstract +

We report on the first observation of tertiary reaction-in-flight (RIF) neutrons produced in compressed deuterium and tritium filled capsules using the National Ignition Facility at Lawrence Livermore National Laboratory, Livermore, CA. RIF neutrons are produced by third-order, out of equilibrium (“in-flight”) fusion reactions, initiated by primary fusion products. The rate of RIF reactions is dependent upon the range of the elastically scattered fuel ions and therefore a diagnostic of Coulomb physics within the plasma. At plasma temperatures of ∼5 keV, the presence of neutrons with kinetic energies greater than 15 MeV is a unique signature for RIF neutron production. The reaction ¹⁶⁹Tm(n,3n)¹⁶⁷Tm has a threshold of 15.0 MeV, and a unique decay scheme making it a suitable diagnostic for observing RIF neutrons. RIF neutron production is quantified by the ratio of ¹⁶⁷Tm/¹⁶⁸Tm observed in a ¹⁶⁹Tm foil, where the reaction ¹⁶⁹Tm(n,2n)¹⁶⁸Tm samples the primary neutron fluence. Averaged over 4 implosions1^–4 at the NIF, the ¹⁶⁷Tm/¹⁶⁸Tm ratio is measured to be 1.5 ± 0.3 x 10⁻⁵, leading to an average ratio of RIF to primary neutron ratio of 1.0 ± 0.2 x 10⁻⁴. These ratios are consistent with the predictions for charged particle stopping in a quantum degenerate plasma.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years