Download or read book Ranchero Explosive Pulsed Power Experiments written by and published by . This book was released on 1999 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors are developing the Ranchero high explosive pulsed power (HEPP) system to power cylindrically imploding solid-density liners for hydrodynamics experiments. The near-term goal is to conduct experiments in the regime pertinent to the Atlas Capacitor bank. That is, they will attempt to implode liners of (approximately)50 g mass at velocities approaching 15 km/sec. The basic building block of the HEPP system is a coaxial generator with a 304.8 mm diameter stator, and an initial armature diameter of 152 mm. The armature is expanded by a high explosive (HE) charge detonated simultaneously along its axis. They have reported a variety of experiments conducted with generator modules 43 cm long and have presented an initial design for hydrodynamic liner experiments. In this paper they give a synopsis of their first system test, and a status report on the development of a generator module that is 1.4 m long.
Download or read book The Ranchero Explosive Pulsed Power System written by and published by . This book was released on 1997 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors are currently developing a high explosive pulsed power system concept that they call Ranchero. Ranchero systems consist of series-parallel combinations of simultaneously initiated coaxial magnetic flux compression generators, and are intended to operate in the range from 50 MA to a few hundred MA currents. One example of a Ranchero system is shown here. The coaxial modules lend themselves to extracting the current output either from one end or along the generator midplane. They have previously published design considerations related to the different module configurations, and in this paper they concentrate on the system that they will use for their first imploding liner tests. A single module with end output. The module is 1.4-m long and expands the armature by a factor of two to reach the 30-cm OD stator. The first heavy liner implosion experiments will be conducted in the range of 40--50 MA currents. Electrical tests, to date, have employed high explosive (HE) charges 43-cm long. They have performed tests and related 1D MHD calculations at the 45-MA current level with small loads. From these results, they determine that they can deliver currents of approximately 50 MA to loads of 8 nH.
Download or read book Five to Ten MA Experiments Using Flat Plate Explosive Generators written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: High explosive pulsed power (HEPP) techniques can address a wide range of pulsed power needs. The basis for HEPP techniques is the use of high explosives to reduce the inductance of a current-carrying circuit, thus multiplying the current due to magnetic flux conservation. For the past twenty years at Los Alamos, our high energy density physics (HEDP) program has followed a path leading to more sophisticated and higher current (and often power) systems. Twenty years ago, we had the capability of conducting tests at 10, or even 30 MA, with no power conditioning and low inductance loads. The time scale of the experiment was the time it took to compress the flux explosively, and our fastest generator with high current capability was a plate generator. The operating time of the generator is less than 15 [mu]s, and flux loading requires either an additional ≈60 [mu]s or a reduced-efficiency inductive coupling scheme. We could also deliver shortened pulses to select loads by completing our generator circuit, initially, with a relatively high inductance circuit element, then switching in a lower inductance with 2-3 [mu]s left of the generator pulse. Figure 1 shows the results of such a test. The test was conducted in 1974 to investigate our capability to drive plasma z-pinch experiments for the production of soft x-rays, and was a pulsed power success. However, our understanding of vacuum power flow issues was not mature enough at that time to design a functioning plasma z-pinch load. There was a renewed need for such a system in 1980, and at that time we began assembling a complete set of techniques required for success. We first fielded a baseline test using a simplified version of the HEPP system that generated the Figure 1 data. Subsequent tests followed a 'bite size' philosophy. That is, we first designed a complete system for a level of complexity at which we believed success could be achieved. We conducted tests of that system, and once it was working in all respects, we designed the next generation system. The ultimate goal of this process was to develop a source of ≈1 MJ of soft x-rays. The process culminated, after the development of two intermediate level systems, with the development of the Procyon system. This system produced x-ray pulses of up to 1.7 MJ at temperatures up to 97 eV. Following those experiments, our attention turned to powering solid-density z-pinch liners, requiring even higher current systems. At Los Alamos, we developed the Ranchero system for that purpose, and we have collaborated with HEPP experts in Russia to power similar liner loads using disk generator systems. Our Ranchero system includes a module tested at ≈50 MA, that should operate easily at 70-90 MA. We designed Ranchero to allow modules arrayed in parallel to generate currents over 200 MA, and we are confident that we can do experiments now at 50-200 MA in the same way that we could do tests at 10-30 MA with plate generators 20 years ago. We have recently stepped back from our quest for higher energy and power systems to consider what applications we can address using relatively low cost plate generators coupled with advances achieved in our HEDP system development. We will describe relevant HEPP components, and discuss two promising applications.
Download or read book Modeling and Analysis of the Ranchero Coaxial Explosive Pulse Power Generator System written by and published by . This book was released on 1999 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A key element in the design of a coaxial generator system is the simplicity of the geometry. The clean cylindrical geometry allows us a reasonable chance at modeling RANCHERO performance using our 1D and 2D MHD modeling codes. The results of numerical simulations have been compare to several tests of the RANCHERO system in a variety of configurations. Recent comparisons of 1D calculations with the REOT-2 data have been extremely good and suggest that the generator is behaving in a very 1D like nature until reaching 90-95% of peak current. Differences between calculated current and measured performance during the last 3 mm (out of 70 mm) of flux compression may be a consequence of either the EOS for SF6, 2D effects, or both. This study will examine the existing models and attempt to provide a robust integrated model which can then be used to drive design studies, pre- and post-shot analysis, and predict performance parameters for slight variations of the base design of RANCHE RO.
Download or read book Megagauss Magnetic Field Generation Its Application to Science and Ultra high Pulsed power Technology written by Hans J. Schneider-Muntau and published by World Scientific. This book was released on 2004 with total page 749 pages. Available in PDF, EPUB and Kindle. Book excerpt: The generation of megagauss fields for science and technology is an exciting area at the extremes of parameter space, involving the application and controlled handling of extremely high power and energy densities in small volumes and on short time scales. New physical phenomena, technological challenges, and the selection and development of materials, together create a unique potential and synergy resulting in fascinating discoveries and achievements. This book is a collection of the contributions of an international conference, which assembled the leading scientists and engineers worldwide working on the generation and use of the strongest magnetic fields possible. Other research activities include generators that employ explosives to create ultra-high pulsed power for different applications, such as megavolt or radiation sources. Additional topics are the generation of plasmas and magnetized plasmas for fusion, imploding liners, rail guns, etc.
Download or read book Recent Progress with High Explosive Pulsed Power Isentropic Compression Experiments written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Capabilities for High Explosive Pulsed Power Research at Los Alamos National Laboratory written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on topics requiring high magnetic fields and high currents have been pursued using high explosive pulsed power (HEPP) techniques since the 1950s at Los Alamos National Laboratory. We have developed many sophisticated HEPr systems through the years, and most of them depend on technology available from the nuclear weapons program. Through the 1980s and 1990s, our budgets would sustain parallel efforts in zpinch research using both HEPr and capacitor banks. In recent years, many changes have occurred that are driven by concerns such as safety, security, and environment, as well as reduced budgets and downsizing of the National Nuclear Security Administration (NNSA) complex due to the end of the cold war era. In this paper, we review the teclmiques developed to date, and adaptations that are driven by changes in budgets and our changing complex. One new Ranchero-based solid liner z-pinch experimental design is also presented. Explosives that are cast to shape instead of being machined, and initiation systems that depend on arrays of slapper detonators are important new tools. Some materials that are seen as hazardous to the environment are avoided in designs. The process continues to allow a wide range of research however, and there are few, if any, experiments that we have done in the past that could not be perform today. The HErr firing facility at Los Alamos continues to have a 2000 lb. high explosive limit, and our 2.4 MJ capacitor bank remains a mainstay of the effort. Modem diagnostic and data analysis capabilities allow fewer personnel to achieve better results, and in the broad sense we continue to have a robust capability.
Download or read book Digest of Technical Papers written by and published by . This book was released on 2003 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Legacy of the megagoule Committee Thirty Years of Explosive Pulsed Power Research and Development at Los Alamos National Laboratory written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1980, Los Alamos formed the 'Megajoule Committee' with the expressed goal of developing a one Megajoule plasma radiation source. The ensuing research and development has given rise to a wide variety of high explosive pulsed power accomplishments, and there is a continuous stream of work that continues to the present. A variety of flux compression generators (FCGs or generators) have been designed and tested, and a number of pulse shortening schemes have been investigated. Supporting computational tools have been developed in parallel with experiments. No fewer that six unique systems have been developed and used for experiments. This paper attempts to pull together the technical details, achievements, and wisdom amassed during the intervening thirty years, and notes how we would push for increased performance in the future.
Download or read book The Full Function Test Explosive Generator written by and published by . This book was released on 2009 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have conducted three tests of a new pulsed power device called the Full Function Test (FFT). These tests represented the culmination of an effort to establish a high energy pulsed power capability based on high explosive pulsed power (HEPP) technology. This involved an extensive computational modeling, engineering, fabrication, and fielding effort. The experiments were highly successful and a new US record for magnetic energy was obtained.
Download or read book Explosive Pulsed Power written by and published by . This book was released on 2004 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forget the Alamo written by Bryan Burrough and published by Penguin. This book was released on 2022-06-07 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: A New York Times bestseller! “Lively and absorbing. . ." — The New York Times Book Review "Engrossing." —Wall Street Journal “Entertaining and well-researched . . . ” —Houston Chronicle Three noted Texan writers combine forces to tell the real story of the Alamo, dispelling the myths, exploring why they had their day for so long, and explaining why the ugly fight about its meaning is now coming to a head. Every nation needs its creation myth, and since Texas was a nation before it was a state, it's no surprise that its myths bite deep. There's no piece of history more important to Texans than the Battle of the Alamo, when Davy Crockett and a band of rebels went down in a blaze of glory fighting for independence from Mexico, losing the battle but setting Texas up to win the war. However, that version of events, as Forget the Alamo definitively shows, owes more to fantasy than reality. Just as the site of the Alamo was left in ruins for decades, its story was forgotten and twisted over time, with the contributions of Tejanos--Texans of Mexican origin, who fought alongside the Anglo rebels--scrubbed from the record, and the origin of the conflict over Mexico's push to abolish slavery papered over. Forget the Alamo provocatively explains the true story of the battle against the backdrop of Texas's struggle for independence, then shows how the sausage of myth got made in the Jim Crow South of the late nineteenth and early twentieth century. As uncomfortable as it may be to hear for some, celebrating the Alamo has long had an echo of celebrating whiteness. In the past forty-some years, waves of revisionists have come at this topic, and at times have made real progress toward a more nuanced and inclusive story that doesn't alienate anyone. But we are not living in one of those times; the fight over the Alamo's meaning has become more pitched than ever in the past few years, even violent, as Texas's future begins to look more and more different from its past. It's the perfect time for a wise and generous-spirited book that shines the bright light of the truth into a place that's gotten awfully dark.
Download or read book We the Media written by Dan Gillmor and published by "O'Reilly Media, Inc.". This book was released on 2006-01-24 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Looks at the emerging phenomenon of online journalism, including Weblogs, Internet chat groups, and email, and how anyone can produce news.
Download or read book I Know Why the Caged Bird Sings written by Maya Angelou and published by Random House. This book was released on 2010-07-21 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here is a book as joyous and painful, as mysterious and memorable, as childhood itself. I Know Why the Caged Bird Sings captures the longing of lonely children, the brute insult of bigotry, and the wonder of words that can make the world right. Maya Angelou’s debut memoir is a modern American classic beloved worldwide. Sent by their mother to live with their devout, self-sufficient grandmother in a small Southern town, Maya and her brother, Bailey, endure the ache of abandonment and the prejudice of the local “powhitetrash.” At eight years old and back at her mother’s side in St. Louis, Maya is attacked by a man many times her age—and has to live with the consequences for a lifetime. Years later, in San Francisco, Maya learns that love for herself, the kindness of others, her own strong spirit, and the ideas of great authors (“I met and fell in love with William Shakespeare”) will allow her to be free instead of imprisoned. Poetic and powerful, I Know Why the Caged Bird Sings will touch hearts and change minds for as long as people read. “I Know Why the Caged Bird Sings liberates the reader into life simply because Maya Angelou confronts her own life with such a moving wonder, such a luminous dignity.”—James Baldwin From the Paperback edition.
Download or read book Born to Run written by Christopher McDougall and published by Profile Books. This book was released on 2010-12-09 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: A New York Times bestseller 'A sensation ... a rollicking tale well told' - The Times At the heart of Born to Run lies a mysterious tribe of Mexican Indians, the Tarahumara, who live quietly in canyons and are reputed to be the best distance runners in the world; in 1993, one of them, aged 57, came first in a prestigious 100-mile race wearing a toga and sandals. A small group of the world's top ultra-runners (and the awe-inspiring author) make the treacherous journey into the canyons to try to learn the tribe's secrets and then take them on over a course 50 miles long. With incredible energy and smart observation, McDougall tells this story while asking what the secrets are to being an incredible runner. Travelling to labs at Harvard, Nike, and elsewhere, he comes across an incredible cast of characters, including the woman who recently broke the world record for 100 miles and for her encore ran a 2:50 marathon in a bikini, pausing to down a beer at the 20 mile mark.
Download or read book Burn Witch Burn written by Abraham Merritt and published by Jovian Press. This book was released on 2017-12-02 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: I AM a medical man specializing in neurology and diseases of the brain. My peculiar field is abnormal psychology, and in it I am recognized as an expert. I am closely connected with two of the foremost hospitals in New York, and have received many honors in this country and abroad. I set this down, risking identification, not through egotism but because I desire to show that I was competent to observe, and competent to bring practiced scientific judgment upon, the singular events I am about to relate...
Download or read book Under the Volcano written by Malcolm Lowry and published by New Amer Library. This book was released on 1984 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geoffrey Firmin, a former British consul, has come to Quauhnahuac, Mexico. His debilitating malaise is drinking, an activity that has overshadowed his life. On the most fateful day of the consul's life--the Day of the Dead, 1938--his wife, Yvonne, arrives in Quauhnahuac, inspired by a vision of life together away from Mexico and the circumstances that have driven their relationship to the brink of collapse. She is determined to rescue Firmin and their failing marriage, but her mission is further complicated by the presence of Hugh, the consul's half brother, and Jacques, a childhood friend. The events of this one significant day unfold against an unforgettable backdrop of a Mexico at once magical and diabolical. Under the Volcano remains one of literature's most powerful and lyrical statements on the human condition, and a brilliant portrayal of one man's constant struggle against the elemental forces that threaten to destroy him.
