Footnotes for ATOMIC ADVENTURES
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Scientific and Technical Report 2001 Volume VI Large Research Facilities
PAUL SCHERRER INSTITUT ISSN 1423-7350 March 2002 Scientific and Technical Report 2001 Volume VI Large Research Facilities ed. by: Renate Bercher, Carmen Büchli, Lotty Zumkeller CH-5232 Villigen PSI Switzerland Phone: 056/310 21 11 Telefax: 056/31021 99 http://www.psi.ch I TABLE OF CONTENTS Foreword l Accelerator Physics and Development Operation of the PSI-accelerator facility in 2001 5 Progress in the production of the new ring cyclotron cavity 7 Coupled field analysis of the new ring cyclotron cavity 9 Experimental upgrade of the injector II150 MHz RF system 11 Replacement of magnet power supplies, control and field-bus for the PSI cyclotron accelerators 13 Investigations on discharges of high voltage devices based on a transient recorder program 15 Test of a radio-frequency-driven mulitcusp proton source 16 Emittance measurements at the PSI ECR heavy ion source 17 Profile measurement of scanning proton beam for LiSoR using carbon fibre harps 18 A fast dégrader to set the energies for the application of the depth dose in proton therapy 20 MAD9P a parallel 3D particle tracker with space charge 22 Behaviour of the different poisson solvers in the light of beam dynamics simulations 24 Computational electrodynamics on the LINUX-cluster 26 Particle ray-tracing program TRACK applied to accelerators 27 Experimental Facilities Rebuilt beam line section between the targets M and E 31 Disposal preparation for meson production targets 33 A novel method to improve the safety of the planned MEGAPIE target at SINQ 34 Beamline adaptation for the MEGAPIE-target -
Gold Embrittlement of Solder Joints 2018.Pages
Gold Embrittlement of Solder Joints Ed Hare, PhD - SEM Lab, Inc 425.335.4400 [email protected] Introduction Gold embrittlement of solder joints has been written about for at least four decades [1 – 3]. Nevertheless, gold embrittlement related solder joint failures have been analyzed in this laboratory as recently as July 2009. Gold embrittlement can be avoided by careful solder joint design and knowledge of the causes of this condition. The purpose of this paper is to provide a detailed account of material and process parameters that can lead to gold embrittlement in electronic assemblies. There are a variety of reasons that designers might want to solder to gold or gold plating. One reason is that some designs involve wire bonding and soldering operations on the same assembly. Another reason would be to include gold contact pads (e.g. for dome keypad contacts) or card edge contacts (e.g. PC cards). The wire bond pads or contact pads can be selectively gold plated, but the selective plating process can be expensive. The electronics industry currently recognizes a threshold level for gold that can be dissolved into eutectic tin-lead solder above which the solder is likely to become embrittled. This threshold is ~ 3 wt% gold. It will be shown in the paragraphs below that embrittlement of solder joints can develop at significantly lower bulk gold concentrations. Metallurgical Description of Gold Embrittlement The most important soldering alloy in the electronics industry is the eutectic tin-lead alloy, 63%Sn – 37%Pb. This may change in the near future as lead-free soldering takes its hold on the industry. -
FTC Guideline - Title 16, Commercial Practices Part 23 for Gold Plating Over Sterling Silver Jewelery
Reference: FTC guideline - Title 16, commercial practices part 23 for gold plating over sterling silver Jewelery Dear Sir, My concern is on low K gold plating (10/14/18) over sterling silver. As per me, gold plating on silver Jewellery should be done only with > 23K. Following are the reasons to support my recommendation: REASONS TO AVOID LOW K GOLD PLATING • In low karat gold micron electroplating, we have to use either Au/Cu or Au/Ag chemistry. Au/Cu chemistry plating color for 14K is too pink (5N) & Au/Ag chemistry plating color is too green. We have to give top coat of 0.1 micron of high karat gold (>23K) to achieve Hamilton color (1N/2N) over low karat gold plating. • Doing low karat gold plating & cover it with nominal high karat gold for color, deficit the purpose of gold plated Jewellery. If the top flash gold will wear out then actual gold alloy color (pink/green) will expose (pink/green) which will tarnish too fast. • Achieving exact K (10/14/18) in low K electroplating is practically not possible. • We cannot identify gold purity of plating thickness on sterling silver by XRF because there are common elements present in plating thickness & base (e.g. Ag,Cu..). • Gold alloy (10/14/18) thickness testing is not possible by XRF because standards available for thickness calibration are in 24K. It is impossible to make 10/14/18 K standards as per plating compositions (Au/Cu & Au/Ag) because it cannot be fabricated. Thickness measurement of low K on XRF is manipulated method, where instrument detects pure gold ions throughout the plating layer & then by density calculation it will be converted into low K plating thickness(e.g.- 14 K density is 13 g/cc & pure gold is 19.3 g/cc. -
Understanding Gold Plating
Understanding Gold Plating Peter Wilkinson Engelhard Limited, Cinderford, Gloucestershire, United Kingdom For effective operation, gold plating baths must require the mini- mum of attention in respect of replenishment and replacement, and must produce as little sub-standard or reject work as possible. To achieve this, an understanding of the processes involved and the factors affecting them is advantageous. This article attempts to provide such an understanding in a simple manner. Special atten- tion is given to the plating of gold from acid baths containing monovalent gold complexes. The use of gold as a contact material on connectors, Other gold(I) complexes, such as those with thiomalate and switches and printed circuit boards (PCB's) is now well estab- thiosulphate have been considered, but it is doubtful if they lished. There is also an awareness that only gold deposits from will ever find commercial application. acid (pH 3.5-5.0) gold(I) cyanide baths containing cobalt, In terms of electricity consumed, gold(I) baths are more nickel or iron as brightening agents have the appropriate efficient than gold(III) baths. Thus, assuming 100 per cent properties for a contact material. Gold deposits from: pure efficiency, 100 amp-min will deposit 12.25 g of gold from a gold(I) cyanide baths; from such baths containing organic monovalent gold complex, but only 4.07 g from a trivalent gold materials as brightening agents; or from electrolytes containing complex. gold in the form of the gold(I) sulphite complex, do not have Nevertheless, deposition from acid gold(III) cyanide baths the sliding wear resistance which is necessary for make and has merit in the plating of acid resistant substrates such as stain- break connections (1). -
Challenges on ENEPIG Finished Pcbs: Gold Ball Bonding and Pad Metal Lift
As originally published in the IPC APEX EXPO Proceedings. Challenges on ENEPIG Finished PCBs: Gold Ball Bonding and Pad Metal Lift Young K. Song and Vanja Bukva Teledyne DALSA Inc. Waterloo, ON, Canada Abstract As a surface finish for PCBs, Electroless Nickel/Electroless Palladium/Immersion Gold (ENEPIG) was selected over Electroless Nickel/Immersion Gold (ENIG) for CMOS image sensor applications with both surface mount technology (SMT) and gold ball bonding processes in mind based on the research available on-line. Challenges in the wire bonding process on ENEPIG with regards to bondability and other plating related issues are summarized. Gold ball bonding with 25um diameter wire was performed. Printed circuit boards (PCBs) were surface mounted prior to the wire bonding process with Pb-free solder paste with water soluble organic acid (OA) flux. The standard gold ball bonding process (ball / stitch bonds) was attempted during process development and pre-production stages, but this process was not stable enough for volume production due to variation in bondability within one batch and between PCB batches. This resulted in the standard gold ball bonding process being changed to stand-off-stitch bonding (SSB) or the ball-stitch-on-ball (BSOB) bonding process, in order to achieve gold ball bonding successfully on PCBs with an ENEPIG finish for volume production. Another area of concern was pad metal lifting (PML) experienced on some PCBs, and PCB batches, where the palladium (Pd) layer was completely separated from nickel (Ni) either during wire bonding or during sample destructive wire pull tests, indicating potential failures in the remainder of the batch. -
IYNC2016 and Beyond 2 3
IYNC BULLETIN International Youth Nuclear Congress SPECIAL EDITION #12 September 2016 www.iync.org IYNC2016 and beyond 2 3 Editorial Dear IYNC community, Some innovating solutions are already in development. Small modular reactors (SMRs), hybrid renewable-nuclear energy solutions, and accident tolerant fuel (ATF) are good As the newly elected IYNC President examples. Innovation will also have to happen in other areas, such as, licensing, waste I would like to welcome you to the 12th management and decommissioning. Successful projects will result in multi-disciplinary IYNC Bulletin. This issue marks the be- and multi-cultural initiatives requiring partnerships between various experts and cultures. ginning of a new term for IYNC. A new With its network of 49 countries, IYNC has the potential to support innovation in nuclear leadership team was elected in July 2016 energy. for the period 2016 – 2018. Innovation will be the focus of this term. Innovating for IYNC2016 was also a unique opportunity to discuss the future of IYNC. The first IYNC IYNC but also supporting innovation in Alumni event took place in Hangzhou where several ideas were discussed. A need to nuclear science and technology. innovate within IYNC was also identified. In this new term, we will work to develop IYNC activities beyond the bi-annual congress. As an example we plan to develop an innova- There is a growing consensus that the global warming mitigation objective of limiting to a tion contest, which you will hear more about soon. Other priorities will have to do with 2°C rise in global temperatures cannot be met without nuclear energy. -
A Pedagogy of Diminishing Returns: Scientific Involution Across Three Generations of Nuclear Weapons Science
3 A Pedagogy of Diminishing Returns: Scientific Involution across Three Generations of Nuclear Weapons Science Hugh Gusterson In science studies we hear a lot about the construction of facts, the building of net- works, and the growth of disciplines, but much less about the withering, decay, or arte- riosclerosis of fields of knowledge (brought on either through natural exhaustion of a particular approach or through external constraints). We have a disciplinary bias toward scientific evolution and revolution rather than what I am here calling involu- tion.1 A generation of historians, sociologists, and anthropologists of science has learned from actor-network theory and the sociology of scientific knowledge (SSK) to focus on the building of scientific institutions and facts, and from Thomas Kuhn to expect a certain historical rhythm in the evolution of scientific fields of knowledge: first, a dynamic burst of creativity (the “revolution”) as the foundational ideas of the new field are laid down; second, a period of “normal science” in which gaps are filled in as the new knowledge is institutionalized; and, finally, as puzzles emerge that can- not be fully explained by the established paradigm, a new burst of creativity as another generation redefines the fundamental precepts of the field.2 In this essay, looking at three generations of nuclear weapons designers, I follow and then depart from the Kuhnian script. Although the first two generations of nuclear weapons scientists con- formed perfectly to the Kuhnian storyline, the final story -
The Los Alamos Thermonuclear Weapon Project, 1942-1952
Igniting The Light Elements: The Los Alamos Thermonuclear Weapon Project, 1942-1952 by Anne Fitzpatrick Dissertation submitted to the Faculty of Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY in SCIENCE AND TECHNOLOGY STUDIES Approved: Joseph C. Pitt, Chair Richard M. Burian Burton I. Kaufman Albert E. Moyer Richard Hirsh June 23, 1998 Blacksburg, Virginia Keywords: Nuclear Weapons, Computing, Physics, Los Alamos National Laboratory Igniting the Light Elements: The Los Alamos Thermonuclear Weapon Project, 1942-1952 by Anne Fitzpatrick Committee Chairman: Joseph C. Pitt Science and Technology Studies (ABSTRACT) The American system of nuclear weapons research and development was conceived and developed not as a result of technological determinism, but by a number of individual architects who promoted the growth of this large technologically-based complex. While some of the technological artifacts of this system, such as the fission weapons used in World War II, have been the subject of many historical studies, their technical successors -- fusion (or hydrogen) devices -- are representative of the largely unstudied highly secret realms of nuclear weapons science and engineering. In the postwar period a small number of Los Alamos Scientific Laboratory’s staff and affiliates were responsible for theoretical work on fusion weapons, yet the program was subject to both the provisions and constraints of the U. S. Atomic Energy Commission, of which Los Alamos was a part. The Commission leadership’s struggle to establish a mission for its network of laboratories, least of all to keep them operating, affected Los Alamos’s leaders’ decisions as to the course of weapons design and development projects. -
108–650 Senate Hearings Before the Committee on Appropriations
S. HRG. 108–650 Senate Hearings Before the Committee on Appropriations Energy and Water Development Appropriations Fiscal Year 2005 108th CONGRESS, SECOND SESSION H.R. 4614 DEPARTMENT OF DEFENSE—CIVIL DEPARTMENT OF ENERGY DEPARTMENT OF THE INTERIOR NONDEPARTMENTAL WITNESSES Energy and Water Development Appropriations, 2005 (H.R. 4614) S. HRG. 108–650 ENERGY AND WATER DEVELOPMENT APPROPRIATIONS FOR FISCAL YEAR 2005 HEARINGS BEFORE A SUBCOMMITTEE OF THE COMMITTEE ON APPROPRIATIONS UNITED STATES SENATE ONE HUNDRED EIGHTH CONGRESS SECOND SESSION ON H.R. 4614 AN ACT MAKING APPROPRIATIONS FOR ENERGY AND WATER DEVELOP- MENT FOR THE FISCAL YEAR ENDING SEPTEMBER 30, 2005, AND FOR OTHER PURPOSES Department of Defense—Civil Department of Energy Department of the Interior Nondepartmental witnesses Printed for the use of the Committee on Appropriations ( Available via the World Wide Web: http://www.access.gpo.gov/congress/senate U.S. GOVERNMENT PRINTING OFFICE 92–143 PDF WASHINGTON : 2005 For sale by the Superintendent of Documents, U.S. Government Printing Office Internet: bookstore.gpo.gov Phone: toll free (866) 512–1800; DC area (202) 512–1800 Fax: (202) 512–2250 Mail: Stop SSOP, Washington, DC 20402–0001 COMMITTEE ON APPROPRIATIONS TED STEVENS, Alaska, Chairman THAD COCHRAN, Mississippi ROBERT C. BYRD, West Virginia ARLEN SPECTER, Pennsylvania DANIEL K. INOUYE, Hawaii PETE V. DOMENICI, New Mexico ERNEST F. HOLLINGS, South Carolina CHRISTOPHER S. BOND, Missouri PATRICK J. LEAHY, Vermont MITCH MCCONNELL, Kentucky TOM HARKIN, Iowa CONRAD BURNS, Montana BARBARA A. MIKULSKI, Maryland RICHARD C. SHELBY, Alabama HARRY REID, Nevada JUDD GREGG, New Hampshire HERB KOHL, Wisconsin ROBERT F. BENNETT, Utah PATTY MURRAY, Washington BEN NIGHTHORSE CAMPBELL, Colorado BYRON L. -
INVENTING Los ALAMOS This Page Intentionally Left Blank INVENTING LOS ALAMOS the Growth of an Atomic Community
INVENTING Los ALAMOS This page intentionally left blank INVENTING LOS ALAMOS The Growth of an Atomic Community JONHUNNER Also by Jon Hunner (coauthor) Las Cruces (Chicago, 2003) (coauthor) Santa Fe: A Historical Walking Guide (Chicago, 2004) This book is published with the generous assistance of the McCasland Foun- dation, Duncan, Oklahoma. Library of Congress Cataloging-in-PublicationData Hunner, Jon. Inventing Los Alamos : the growth of an atomic community / Jon Hunner. p. cm. Includes bibliographical references and index. ISBN 0-8061-3634-0 (alk. paper) 1. Los Alamos (N.M.)-History-20th century. 2. Los Alamos (N.M.)- Social life and customs-20th century. 3. Los Alamos (N.M.)-Social con- ditions-20th century. 4. Family-New Mexico-Los Alamos-History- 20th century. 5. Community life-New Mexico-Los Alamos-History- 20th century. 6. Nuclear weapons-Social aspects-New Mexico-Los Alamos-History-20th century. 7. Nuclear weapons-Social aspects- United States-History-20th century. 8. Cold War-Social aspects-New Mexico-Los Alamos. 9. Cold War-Social aspects-United State. I. Title. F804.L6H86 2004 978.9'58053--&22 2004046086 The paper in this book meets the guidelines for permanence and durability of the Committee on Production Guidelines for Book Longevity of the Council on Library Resources, Inc. m Copyright O 2004 by the University of Oklahoma Press, Norman, Publishing Division of the University. All rights reserved. Manufactured in the U.S.A. CONTENTS LIST OF ILLUSTRATIONS vii ACKNOWLEDGMENTS ix INTRODUCTION 3 CHAPTER l Rendezvous at Site Y The Instant City 12 CHAPTER 2 Fishing in the Desert with Fat Man: Civic Tension, Atomic Explosion CHAPTER 3 Postwar Los Alamos: Exodus, New Growth, and Invisible Danger CHAPTER 4 Los Alamos Transformed: Federal Largesse and Red Challenge CHAPTER 5 A Cold War Community Up in Arrns: Competition and Conformity CHAPTER 6 Toward Normalizing Los Alamos: Cracking the Gates CHAPTER 7 Atomic City on a Hill: Legacy and Continuing Research NOTES BIBLIOGRAPHY INDEX This page intentionally left blank PHOTOGRAPHS J. -
Prevent, Counter, and Respond—A Strategic Plan to Reduce Global Nuclear Threats
Prevent, Counter, and Respond—A Strategic Plan to Reduce Global Nuclear Threats FY 2018–FY 2022 Report to Congress November 2017 National Nuclear Security Administration United States Department of Energy Washington, DC 20585 Department of Energy/National Nuclear Security Administration | November 2017 Message from the Administrator The Department of Energy’s (DOE) National Nuclear Security Administration (NNSA) Fiscal Year 2018 report, Prevent, Counter, and Respond—A Strategic Plan to Reduce Global Nuclear Threats, outlines DOE/NNSA’s plans and programs to prevent the proliferation of nuclear weapons, counter the threat of nuclear terrorism, and respond to nuclear and radiological incidents around the world. The report is a companion to the Fiscal Year 2018 Stockpile Stewardship and Management Plan, which describes DOE/NNSA’s activities to ensure the reliability of the U.S. nuclear stockpile and maintain its foundational capabilities and infrastructure. In keeping with our commitment to transparency, updated versions of these reports are published each year. Maintaining the U.S. nuclear stockpile and reducing global nuclear threats—two missions that are often thought to involve different technical expertise and pursue disparate goals—are far more interconnected than they may appear. Many activities within these two DOE/NNSA mission pillars are mutually reinforcing and supportive of common objectives. The facilities and scientific knowledge that underpin stockpile stewardship, for example, are harnessed for a range of nonproliferation and counterterrorism missions, from assessing foreign weapons programs and potential terrorist devices to managing the proliferation risks posed by civil nuclear applications. Preventing the spread of nuclear weapons around the world yields considerable benefits for the U.S. -
Stockpile Stewardshipquarterly
DOE/NA-0066 Office of Research, Development, Test, and Evaluation Stockpile Stewardship Quarterly VOLUME 7 | NUMBER 4 | DECEMBER 2017 essage from the Assistant Deputy Administrator for Research, M Development, Test, and Evaluation, Dr. Kathleen Alexander In stockpile stewardship, one of the most Laboratory (LANL) takes a different focus, widely studied phenomena is the equation looking at the EOS and shock-driven of state (EOS). An EOS is a mathematical decomposition of ‘soft’ materials. LANL relationship that describes the state of uses a two-stage gas gun to collect shock matter (i.e., gas, liquid, or solid) using data of polymers to incorporate in their the material properties of temperature, EOS. volume, pressure, and internal energy. The The Joint Actinide Shock Physics EOS characterizes the properties of a state Experimental Research facility two-stage of matter under a given set of physical gas gun at Nevada National Security Site conditions. It is of interest for the metals (NNSS) is used for both hazardous and and non-metals of stockpile stewardship non-hazardous material studies for input application and is critical to understanding to EOS tables. Many EOS experiments Hong Sio, NNSA-supported senior Physics material behavior. Each of our weapon Department PhD student at the Massachusetts at NNSS involve dynamic materials and laboratories has extensive EOS activities. Institute of Technology (second from left) associated diagnostic developments found time to strike a pose with (left to This issue of the Stockpile Stewardship pertaining to stockpile materials. right) Dr. Njema Frazier and Dr. Bryan Sims Quarterly (SSQ) highlights representative (Research, Development, Test, and Evaluation) EOS activities at our national laboratories, Some of our innovative EOS work origi- and Mark Visosky (TechSource, Inc.) at the the Nevada National Security Site, and nated from the LDRD program projects at 59th Annual Meeting of the American Physical in the Laboratory Directed Research and Sandia.