Editorial Feature

A Monster Light Source with Multiple Applications

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Article updated on 03/03/20 by Jo Finchen-Parsons

There are few laser-based light sources brighter than T-REX, a Lawrence Livermore National Laboratory (LLNL) project developed jointly by the NIF & Photon Science Principal Directorate and Oak Ridge National Laboratory’s (ORNL) Physical Sciences Directorate.

T-Rex – Laser-Based Light Source

Technically known as the Thomson-Radiated Extreme X-ray Source, T-REX is an advanced, laser-based light source in which novel, energetic, picosecond laser pulses are scattered from relativistic electrons to produce monochromatic, highly collimated, tunable X-rays and gamma-rays.

The system will be able to study isotopes, allowing researchers to address challenges in homeland and international security, nonproliferation, advanced nuclear power systems, and nuclear waste identification. For example, in the Department of Homeland Security's FINDER project for high-confidence detection of nuclear materials to enhance port security. Addressing these national security missions could lead to new possibilities for medical and industrial applications of isotope-specific imaging.

T-REX – The Brightest in the World

T-REX achieved megaelectronvolts (MeV) class first light late last month. On March 26, its 10-picosecond electron beam had been powered up to 120 MeV and collided with UV laser photons, and it was used to produce gamma-ray energy of 0.776 MeV, making it the brightest such instrument in the world in this energy range.

We are still working on verifying the absolute record brightness of the source. But without a doubt, the ~0.75 MeV radiation produced by T-REX is unique in the world with respect to its brightness, spectral purity, tunability, pulse duration, and laser-like beam character.

Chris Barty, Program Director, Photon Science and Applications Program, Lawrence Livermore National Laboratory 

The system builds on a past Livermore project called Picosecond Laser-Electron Interaction for the Dynamic Evaluation of Structures (PLEIADES), which was funded by the Laboratory Directed Research and Development (LDRD) Program.

In 2003, the PLEIADES system-generated record pulses of 70-kiloelectronvolts (keV) X-rays. Beams in this particular energy regime are traditionally developed in synchrotron facilities.

Peak Brightness of T-REX

With its MeV-range capabilities, T-REX's peak brightness will be up to 10 orders of magnitude greater than current third-generation synchrotron light sources.

Chris Barty, Program Director, Photon Science and Applications Program, Lawrence Livermore National Laboratory

Bright gamma-ray pulses tuned to specific nuclear energy levels may be used to detect specific nuclei and isotopes, through a process called nuclear resonance fluorescence, first described by Edward Teller in 1948.

Nearly all nuclei have a set of nuclear "fingerprints" – several photon-excited states unique to individual isotopes. When a photon with the defined energy hits a targeted nucleus, the photon is absorbed. The excited nucleus then decays, radiating photons of the characteristic energy in all directions. The absorption of resonant photons, as well as the emitted energy spectrum, can be used to identify the nuclear species or isotope of the target.

Imaging Isotopic Composition of Materials

The Department of Homeland Security's Domestic Nuclear Detection Office is funding research to explore this imaging and detection capability. The proposed system, called Fluorescence Imaging in the Nuclear Domain with Extreme Radiation (FINDER), could be used to image the isotopic composition of materials inside well-shielded objects, such as cargo containers moving through an inspection terminal. If successful, a FINDER system based on T-REX technology could provide a solution to the challenge of detecting concealed, highly enriched uranium.

Barty added that his team is pursuing dynamic applications for T-REX, such as capturing "isotope snapshots" of the movement of materials with 100-billionth of a second shutter speed.

It's a new area that may very well have a large impact on the Lab's core national security missions.

Chris Barty, Program Director, Photon Science and Applications Program, Lawrence Livermore National Laboratory

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