Z Pulsed Power Facility

Z Pulsed Power Facility. It is one of the world's most powerful and efficient laboratory radiation sources, generating extreme conditions for scientific research. Located at Sandia National Laboratories in Albuquerque, New Mexico, the facility is a cornerstone of the U.S. Department of Energy's Stockpile Stewardship Program. Its primary mission involves using immense electrical pulses to create high-energy-density matter for studying nuclear weapon physics and pursuing advancements in inertial confinement fusion.

Overview

The facility is a premier center for high-energy-density physics research, operating under the auspices of the National Nuclear Security Administration. It functions as a vital component of the nation's Stockpile Stewardship Program, which ensures the safety and reliability of the U.S. nuclear arsenal without full-scale testing. By concentrating enormous electrical energy into microscopic targets, the machine can produce temperatures exceeding those found in the core of the Sun and pressures millions of times greater than Earth's atmospheric pressure. This capability supports fundamental science and has implications for astrophysics, studying phenomena like the interiors of gas giant planets such as Jupiter.

Design and operation

The core of the machine is a pulsed power driver that stores electrical energy in large Marx generator banks and then compresses it in time. The design utilizes a technique called pulse-forming with transmission lines and self-magnetically insulated vacuum transmission lines to deliver the power to a central target chamber. The final stage involves a sophisticated Z-pinch configuration, where a powerful electrical current is driven through a cylindrical array of fine tungsten wires. This current creates an intense magnetic field that implodes the wires inward at tremendous velocity, converting their kinetic energy into X-ray radiation and creating a plasma of high-energy-density matter.

Research applications

Research at the facility spans several critical areas central to national security and fundamental science. A primary focus is weapons physics, providing essential data for computer models like those used by the Advanced Simulation and Computing Program. In fusion power research, it conducts experiments in Magnetized Liner Inertial Fusion, an approach to inertial confinement fusion. The extreme conditions generated allow scientists to study the properties of warm dense matter, a state relevant to planetary science, and to conduct laboratory astrophysics experiments that simulate processes in supernovae and white dwarf stars. The facility also contributes to basic plasma physics and radiation hydrodynamics.

Technical specifications

The machine can deliver a peak electrical power of over 80 terawatts. Its pulse shape is precisely controlled, with a current rise time of approximately 100 nanoseconds, culminating in a peak current of up to 30 mega-amperes. This current generates an X-ray output with a total power exceeding 350 terawatts and energies in the range of 1-10 kiloelectronvolts. The target chamber, where experiments are fielded, is designed to accommodate complex diagnostic instruments, including X-ray spectrometers, X-ray diodes, and framing cameras, to measure the properties of the fleeting plasma states.

History and development

The origins of the facility trace back to the Particle Beam Fusion Accelerator program at Sandia National Laboratories in the late 1970s. The original machine, known as the Z machine, began operations in 1985. A major upgrade in the late 1990s, often called the "Z Refurbishment" or "ZR" project, significantly enhanced its power and diagnostic capabilities. This redesign replaced older water-dielectric pulse lines with faster, more efficient hardware, increasing its output by a factor of four. Subsequent continuous improvements, managed by teams of scientists and engineers from Sandia and collaborating institutions like the Massachusetts Institute of Technology and the University of Rochester, have maintained its position at the forefront of pulsed power science.

Category:Research facilities in the United States Category:Physics laboratories Category:Buildings and structures in Albuquerque, New Mexico Category:Sandia National Laboratories Category:1985 establishments in New Mexico