Pulse - Los Alamos Neutron Science Center
PulsetheJune 2016Approved for public release;distribution is unlimited.INSIDE2From Gus’s desk3From Mary’s desk4LANSCE scientistsin the news6Mini-CAPTAIN snags firstionization track7Redesigned LANSCEtarget to provide higherenergy neutrons fornuclear science8Successful run cycle showcasesneutron science in all its diversity1 0Accelerator investments enableextended beam production63Ni (n,γ) cross sectionsmeasured with DANCEAsterix neutronspectrometer probeschemical evolution ofsurfaces and thin filmsin variety of physical andchemical environments1 1Laboratory metallurgistsmake thorium targetsfor production of cancerfighting isotopes1 2Prototype 10-framecamera operatedin proton radiographydynamic experiment1 3SMARTS reveals residualstresses in additivelymanufactured partsFive major experimentalfacilities operatesimultaneously at LANSCE,contributing to the nation’snuclear weapons programand research in nuclearmedicine, materials scienceand nanotechnology,biomedicine, electronicstesting, fundamentalphysics, and many otherareas. The U.S. Departmentof Energy, National NuclearSecurity Administration,Office of Science andOffice of Nuclear Energy,Science and Technology–the principal sponsors ofLANSCE–have synergisticlong-term needs for thelinear accelerator andneutron science that is theheart of LANSCE.The Los Alamos Neutron Science Center (LANSCE)recently completed a productive and—with DOEinvestments in the accelerator—an extended run cycle,operating at full production from October 2015 to Februaryof this year, three weeks beyond the scheduled end date.LANSCE is the Laboratory’s accelerator complex providingintense sources of neutrons and protons for experimentssupporting civilian and national security research.Upon this year’s planned completion of the Linac RiskMitigation Strategy, a DOE investment in the reliability andsustainability of the accelerator, LANSCE is scheduled tooperate from September to February 2017.The LANSCE linac is an essential element of MaRIE,the Laboratory’s proposed experimental facility for timedependent materials science at the mesoscale. LeveragingLANSCE’s existing 1-MW, 0.8-GeV proton accelerator,MaRIE will bring together the world’s highest energy freeelectron laser with gigahertz repetition ability, a Multi-ProbeDiagnostic Hall, and a Making, Measuring, and Modelingfacility. The roadmap to MaRIE leverages governmentinvestments at LANSCE to efficiently provide futurecapability.continued on page 14Los Alamos National Laboratory Newsletter of the Los Alamos Neutron Science Center
2From Gus’s desk . . .“A clear demonstrationof the high-levelsupport we arereceiving is the support“for replacing the current1L target in the LujanCenter.I am honored and excited to be namedthe new LANSCE User Facility director.LANSCE is an amazing facility thatcontinues to provide state-of-the-artmeasurements for the nation. The lastrun cycle was a productive one. Theaccelerator delivered beam for about 100days and had an uptime of 82%. At theIsotope Production Facility, we producedenough strontium-82 for 120,000 cardiacimages and continue to develop alternatemeans to produce actinium-225, an alphaemitter that is being investigated for cancertherapy. Proton Radiography executed 32dynamic experiments, 6 of which supportedthe B-61 Life Extension Program. Weran 119 experiments at the Lujan Centerand Weapons Neutron Research facility,advancing our knowledge of the total fissioncross section of uranium-235 and theneutron energy spectrum from the fissionof plutonium-239. The materials scienceprogram at the Lujan Center executedexperiments to further our understanding ofthe properties of additively manufacturedmaterial, the characteristics of insensitivehigh explosives, and the affect of a simpleheat treatment to the properties of U6Nb.At the Ultracold Neutron facility, wemade significant progress in our ability toaccurately measure the neutron lifetimeand understanding how to increase theflux of ultracold neutrons (UCN), which willbenefit all UCN experiments. We also madecritical contributions to the basic researchprogram at the Large Hadron Collider(LHC) at CERN. The U.S. members of theLHC used the Blue Room to develop theradiation-hard electronics they will need forplanned upgrades at the LHC. In all, wehosted more than 400 visitors at LANSCEduring the run cycle. The schedule wasextended for two weeks to enable twohigh-priority experiments at the ProtonRadiography facility, but everyone wasable to take advantage of the additionalbeam time. We are now in a maintenanceoutage where we are replacing the finalhigh-power amplifier (module 3) of the RFsystem. Work is progressing and we are onschedule to resume accelerator operationsin September.Number of beam days provided perprogram during the most recent LANSCErun cycle.Number of proposals run during the mostrecent LANSCE run cycle; data fromNNSA-designated national user facilities.I am optimistic as we look to the future.Less than two years ago we faced theincredible challenge of the loss of BasicEnergy Sciences funding for the materialsscience program at the Lujan Center.This presented an enormous challengeto the scientists and the mesa. In a shortperiod of time we had to demonstrate tothe NNSA that we could make importantmeasurements in support of its programs.The response from the scientists hasbeen truly amazing—in just a single runcycle they were able to demonstratenot only that we can make neededmeasurements here at LANSCE, but alsothat neutron scattering has an importantrole to play in the Stockpile StewardshipLos Alamos National Laboratory Newsletter of the Los Alamos Neutron Science Centercontinued on page 14
3From Mary’s desk . . .Three near misses in two months at TA-53 is a clear indication we all need to commit topausing, reflecting, and taking action to ensure the safety and well being of ourselves andour coworkers. While the motivation for us to get our job done is a good thing, no job is soimportant that someone gets hurt.These near misses—unplanned events that did not result in injury or fatality, but had thepotential to do so—involved a cut electrical conduit, a 480-volt extension cord, and aforklift-auto collision.“Our assumptions tendto be that everythingwill work as planned—yet conditions changeand human error hap-“pens all the time. Weneed to include this inour thinking.Each near miss had in common a “fortunate” break in the chain of events that prevented acalamitous outcome: the electrical safety officer flipped the circuit breaker, “just because;”the worker held the extension cord by the cable instead of the metal connector box; thedriver of the vehicle drove slowly and braked quickly.In these events, assumptions—not thinking that anyone would cut a conduit containingelectrical wires, that anyone would incorrectly wire an extension cord, or that cars wouldcome through a non-barricaded work area with an obstructed view—played a key role.We make risk calculations on a daily basis—so how do we get the risk assessment right?Our assumptions tend to be that everything will work as planned—yet conditions changeand human error happens all the time. We need to include this in our thinking.Our decisions tend to depend on assessments of time and money. In these events, wecould have expedited air gapping, would have bought a cord rated for the job, should havetaken a minute to lower the forklift tines.Humans are human, and we need to plan for it with robust systems that take into accountthe inevitable. Integrating human performance initiative principles into how we plan andperform our work is essential. We need to think about consequences and how to mitigatethem; an error-tolerant system that lowers the consequences is where we need to go.These recent near misses—the facts and the lessons—were the focus of a discussion between TA-53 residents and its leadership team. Following a plenary session with all attendees, participants divided up into breakout sessions to discuss assessing risk, pausing work,recognizing changing work conditions, and asking for help.From our breakout sessions we received several concrete actions that we can undertake,and we plan to give more careful consideration to the ideas presented briefly from the othersessions. The notes from the breakout sessions and the presentation are available on theADEPS web site.The TA-53 management team remains committed to being present in the workplace—beingaware of what is taking place, being available for questions, and assuring that operationalconcerns are addressed in a timely manner.And we hope each of you during the meeting realized things that you can do to help us allbe safer in the workplace, or if you have ideas later that you share them with co-workers,because the gathering was not just about the day, it was about tomorrow, and all the daysafter tomorrow and how we prepare for and minimize the consequences of inevitable human error.Experimental Physical Sciences Associate Director Mary HockadayLos Alamos National Laboratory Newsletter of the Los Alamos Neutron Science Center
4LANSCE scientists in the newsAndy Saunders among newest APS FellowsAndy Saunders was recentlynamed an American PhysicalSociety Fellow, Division ofNuclear Physics. Saunders(Subatomic Physics, P-25)was cited for contributions indeveloping proton radiographyand the Los Alamos NationalLaboratory ultracold neutronsource, enabling newapplications of nuclearscience and an improvedunderstanding of the decay ofthe free neutron.Saunders, who received a PhD in physics from theUniversity of Colorado, joined the Laboratory in 1998as a postdoctoral researcher. He has participated in thedevelopment of proton radiography (pRad) since the earlydemonstration experiments conducted at BrookhavenNational Laboratory in 1997; has led the Los AlamospRad imaging capability since 2013; and served asthe radiographer in charge of executing more than 150explosively driven dynamic experiments at the Los AlamosNeutron Science Center (LANSCE) for the weaponsprogram, for which he is developing new techniques incharged particle radiography. Saunders also participatedin the design and construction of the Laboratory’sUltracold Neutron Facility and is co-spokesperson of aproject measuring the average lifetime of the free neutron.Saunders has received nine Defense Program Awards ofExcellence and five Los Alamos Distinguished PerformanceAwards.Technical contact: Andy SaundersBruce Carlsten namedIEEE FellowThe Institute of Electrical andElectronics Engineers (IEEE)has honored Bruce Carlsten(Accelerator Operations andTechnology, AOT-DO) withthe title of Fellow. IEEE citedhim “for contributions to highbrightness electron beams andvacuum electron devices.”Carlsten is a pioneer in theproduction and use of highbrightness electron beams. His discovery of techniquesenabling unprecedented beam brightness has led to a newgeneration of intense free-electron lasers, including theLab’s Navy Free Electron Laser (FEL) and MaRIE (MatterRadiation Interactions in Extremes), a proposed premierx-ray FEL facility. These ideas are of such fundamentalimportance that virtually every free-electron laser in theworld uses them.Carlsten received a PhD in electrical engineering fromStanford University and joined the Laboratory in 1982. He isa member-at-large of the IEEE Particle Accelerator Scienceand Technology Technical Committee and the AmericanPhysical Society’s Executive Committee of the Division ofPhysics of Beams, and a Fellow of the American PhysicalSociety and Los Alamos National Laboratory. Carlstenhas received a U.S. Particle Accelerator School Prize forAchievement in Accelerator Physics and Technology, threeLos Alamos Distinguished Performance Awards, and sixpatents on novel accelerator and RF source technologies.He has more than 100 referred publications and serveson the editorial board of Physical Review Special Topics –Accelerators and Beams.Technical contact: Bruce CarlstenJonathan Engle receives DOE Early CareerResearch AwardJonathan Ward Engle(Inorganic Isotope andActinide Chemistry, C-IIAC)received a 2016 EarlyCareer Research ProgramAward from the Departmentof Energy. Engle is one of49 recipients of the award,which recognizes outstandingresearchers in universities andDOE national laboratories.The award also supports thedevelopment of individualresearch programs of scientists early in their careers andstimulates research careers in the disciplines supported bythe DOE Office of Science.Engle’s winning proposal, “Nuclear Data for SpallationNeutron Radioisotope Production,” will establish valuableinternational collaborative relationships with the potential tocreate a sustained fast-neutron cross-section measurementprogram, characterizing new medium-energy neutroninduced reactions relevant to radioisotope productionand facility design, plus the ongoing effort to improve thepredictive power of nuclear codes on supercomputers. Theproject also will enable evaluation of achievable yields ofradioisotopes and consideration of radioisotopic impuritieslikely formed in reactions of current interest to DOE’sIsotope Program.continued on next pageLos Alamos National Laboratory Newsletter of the Los Alamos Neutron Science Center
5LANSCE scientists cont.Sven Vogel named to European SpallationSource’s Scientific and Technical Advisory Panelfor Engineering and ImagingSven Vogel (Materials Sciencein Radiation and DynamicsExtremes, MST-8) hasappointed to the Scientificand Technical Advisory Panel(STAP) for Engineering andImaging for the EuropeanSpallation Source (ESS)by Ken Andersen, head ofthe Neutron InstrumentsDivision of the EuropeanSpallation Source. The ESSis under construction in Lund,Sweden, and once operatingat full power will be the mostpowerful neutron source in theworld. Vogel will advise on the design of the ODIN imagingbeamline as well as the engineering diffractometer BEER.He was selected for this position by Markus Strobl,deputy head of the Instrument Division of ESS due tohis combination of expertise in both engineering neutrondiffraction as well as advanced neutron imaging techniques.Vogel’s appointment is for two to four years. A member ofthe MST-8 scattering team, Vogel is the instrument scientistfor the HIPPO (high pressure/preferred orientation) neutrondiffractometer and the energy-resolved neutron imagingbeam line at the Los Alamos Neutron Science Center.where it was again a winner, competing with other smallsections with up to 500 members. The IEEE consists of 10regions worldwide, of which Region 6 in the United Statesis the largest, covering western states where high-techcompanies abound.IEEE professional interests have expanded, coveringpractically all science and technology, including nuclear,photonic, power, software engineering, and biotechnology.IEEE serves as an umbrella organization for manyprofessional societies of a more precisely defined scope ofinterest, the largest of which is the Computer Society. TheLANNM section includes some of these local chapters.From Los Alamos National Laboratory, LANNM volunteersinclude Section Chair Hanna Makaruk (Applied ModernPhysics, P-21), Section Vice-chair Bruce Carlsten(Accelerator and Operations Technology, AOT-DO),Signal Processing Society Chapter Chair David Izraelevitz(Space Data Systems, ISR-3), Computer Society ChapterChair Michael Ham (P-21), Nuclear & Plasma SciencesSociety Chapter Chair Nathan Moody (Acceleratorsand Electrodynamics, AOT-AE), Women in Science andEngineering Affinity Group Chair Heather Quinn (ISR3), Young Professional Affinity Group Chair CharlesWeaver (Space Electronics and Signal Processing, ISR4), and Section Historian and former longtime Chair TeriRoberts (Data and IT Quality Management, SAE-1).Tom Tierney (Intelligence & Systems Analysis, A-2) is alongtime volunteer and past section chair, currently servingwith IEEE-USA board of directors as vice president forgovernment relations.Technical contact: Hanna MakarukTechnical contact: Sven VogelLos Alamos Northern New MexicoIEEE Section wins two excellenceawardscontinued on next pageThe Los Alamos Northern New Mexico(LANNM) Institute of Electrical andElectronics Engineers (IEEE) Sectionhas received 2015 Outstanding SmallIEEE Section awards for excellence inlocal activities, which are mostly run byvolunteers from Los Alamos NationalLaboratory. LANNM section activitiesinclude technical talks open to the public(about 6–10 per year), professionaldevelopment training, students and highschool events promoting science andengineering, and recruiting gatherings.LANNM section volunteers celebrate the Outstanding Small Section Award at a socialgathering in Los Alamos on IEEE Day. From left: Robert Owczarek (University of NewAfter winning the award in the Southwest Mexico), Bruce Carlsten (Los Alamos National Laboratory), Gregg Giesler (COMPAIndustries), Peter Clout (Vista Control Systems Inc.), Heather Quinn, David Izraelevitz,area of Region 6, the LANNM sectionChristopher Brislawn, Hanna Makaruk, Zack Backer, Michael Ham, Randy Roberts,advanced to the Region 6 competition,and Teri Roberts (all Los Alamos).Los Alamos National Laboratory Newsletter of the Los Alamos Neutron Science Center
6LANSCE scientists cont.Los Alamos Distinguished Performance Awardsrecognize Laboratory staffLos Alamos National Laboratory Distinguished PerformanceAwards are presented in recognition of outstandingcontributions in support the Laboratory’s programmaticefforts. The following LANSCE-based teams wererecognized with awards.Chi-Nu DAQ Team, Small Team AwardThe Chi-Nu project is a multi-laboratory, multi-year, andmulti-million-dollar Campaign 1 experimental nuclearphysics project with the goal to accurately measurethe emission spectrum from neutron-induced fission onplutonium-239 and uranium-235. In January 2014, theexisting Chi-Nu data acquisition (DAQ) system was unableto keep up with the data rate for the studies. In just sixmonths, Shea Mosby and John O’Donnell (LANSCEWeapons Physics, P-27) (photo, above) designed,procured, coded, validated, and implemented a new highlycapable, versatile DAQ scheme that positions the Chi-Nuproject to meet its deliverables and provide required data.Legacy Lead Bricks Team, Large Team AwardMark Peters (Applied Modern Physics, P-21), Julian Lopez(Subatomic Physics, P-25), Steve Glick (Physics DivisionOffice, P-DO) and Jeanette Gray (formerly P-DO), andKeith Rielage and Mitzi Boswell (Neutron Science andTechnology, P-23) were part of a team that repurposed50 tons of legacy lead bricks. When Physics Divisionstaff realized the bricks contained a type of lead usefulfor shielding in particle-physics counting experiments, theteam safely moved the bricks—valued up to 3 million—and shrink-wrapped them, thereby saving a valuableresource for future scientific research and eliminating anenvironmental hazard.LANSCE WNR Facility Recovery Team,Large Team AwardMilestones for two NNSA Defense Program campaignswere at stake when damage from a water leak and a firethreatened to interrupt the Weapons Neutron Researchfacility run cycle. Pete Aguino, Greg Chaparro, TimMedina, and Bill Waganaar (P-27) were among more than40 employees who redesigned the WNR water system,built a replacement for the affected target, and replaced a20,000-pound magnet, which had damaged coils, with twomagnets. Beam was once again delivered on October 18.Mini-CAPTAIN snags first ionization trackLos Alamos detector paves wayfor international neutrino experimentMini-CAPTAIN, the prototype for the Cryogenic Apparatusfor Precision Tests of Argon Interactions with Neutrinos(CAPTAIN), recently demonstrated its first ionization track.The Mini-CAPTAIN detector is a liquid argon time projectionchamber (TPC), a device capable of imaging chargedparticles through the trail of ionization electrons (ionizationtracks) left behind when they interact with the argonnuclei. Its success makes it one of only a handful of liquidargon detectors now operating in the world. Liquid
LANSCE scientists in the news Andy Saunders among newest APS Fellows Andy Saunders was recently named an American Physical Society Fellow, Division of Nuclear Physics. Saunders (Subatomic Physics, P-25) was cited for contributions in . Alamos Neutron Science Center (LANSCE). Pulse .
Feb 24, 2018 · Memorial Day Concert with the Los Alamos Choral Society Monday, May 28, 2018 Time TBA Ashley Pond Tuesday Nights at the Pond Dates TBD ‘ Independence Day Concert Wednesday, July 4, 2018 5:00 p.m. Overlook Park The Los Alamos Community Winds rehearse on Tuesdays from 7:00 – 9:00 p.m. at
6.5.3 Neutron stars and white dwarfs 294 6.5.4 A variety of neutron star models 296 6.5.5 Maximum masses of neutron stars 297 6.5.6 The nature of the maximum mass of neutron stars 298 6.5.7 The upper bound on the maximum mass 301 6.5.8 Low-mass neutron stars and the minimum mass 302 6.6 Radii and surface redshifts 303 6.6.1 Circumferential .
Neutron Stars Other important properties of neutron stars (beyond mass and size): Rotation – as the parent star collapses, the neutron core spins very rapidly, conserving angular momentum. Typical periods are fractions of a second. Magnetic field – again as a result of the collapse, the neutron star’s magnetic field becomes
Mark Dalton Neutron skin at JLab Low Energy Workshop Weak Charge Distribution of Heavy Nuclei 2 Neutron distribution is not accessible to the charge-sensitive photon. proton neutron Electriccharge 1 0 Weakcharge 0.08 1 γ MEM 4πα Q2 F p Q (2) M PV NC G F 2 1 4sin2θ (W)F p Q (2) F n Q [(2)] A PV G F Q 2 4πα2 F n Q (2 .
MCNP Software Quality Assurance Plan. Hilary M. Abhold John S. Hendricks. LA-13138 UC-705 Issued: April 1996. Los. NATIONAL LABORATORY. Alamos. Los Alamos, New Mexico 87545. Los. . This plan describes the Software Qutity Assuranu tent withtherequirementsof EE-730.l andtheguidingprinciplesof
Documentation and Software User’s Manual Version 5.1 LA-CC-06-012 Elizabeth C. Hunke, William H. Lipscomb, Adrian K. Turner, Nicole Jeffery, Scott Elliott Los Alamos National Laboratory Los Alamos NM 87545 March 17, 2015 Contents 1 Introduction 3 2 Coupling with other climate model components4
Form 836 (7/06) LA-UR- Approved for public release; distribution is unlimited. Los Alamos National Laboratory, an affirmative action/equal opportunity employer, is operated by the Los Alamos National Security, LLC for the National Nuclear Security Administration of the U.S. Department
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