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The On-Orbit Calibrations for the Fermi Large Area Telescope

Description: The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope began its on-orbit operations on June 23, 2008. Calibrations, defined in a generic sense, correspond to synchronization of trigger signals, optimization of delays for latching data, determination of detector thresholds, gains and responses, evaluation of the perimeter of the South Atlantic Anomaly (SAA), measurements of live time, of absolute time, and internal and spacecraft boresight alignments. Here we describe on-or… more
Date: November 17, 2011
Creator: Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. et al.
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Pulsed Gamma-Rays From the Millisecond Pulsar J0030+0451 with the Fermi Large Area Telescope

Description: We report the discovery of gamma-ray pulsations from the nearby isolated millisecond pulsar PSR J0030+0451 with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). This discovery makes PSR J0030+0451 the second millisecond pulsar to be detected in gamma-rays after PSR J0218+4232, observed by the EGRET instrument on the Compton Gamma Ray Observatory. The spin-down power {dot E} = 3.5 x 10{sup 33} ergs s{sup -1} is an order of magnitude lower than the empirical… more
Date: November 17, 2011
Creator: Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz et al.
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Femtosecond spectroscopy with vacuum ultraviolet pulse pairs

Description: We combine different wavelengths from an intense high-order harmonics source with variable delay at the focus of a split-mirror interferometer to conduct pump-probe experiments on gas-phase molecules. We report measurements of the time resolution (< 44fs) and spatial profiles (4 {micro}m x 12 {micro}m) at the focus of the apparatus. We demonstrate the utility of this two-color, high-order-harmonic technique by time resolving molecular hydrogen elimination from C{sub 2} H{sub 4} excited into … more
Date: June 17, 2011
Creator: Allison, Tom; Wright, Travis; Stooke, Adam; Khurmi, Champak; van Tilborg, Jeroen; Liu, Yanwei et al.
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open access

Wakefield Calculations for the LCLS in Multbunch Operation

Description: Normally the Linac Coherent Light Source (LCLS) operates in single-bunch mode, sending a bunch of up to 250 pC charge at 120 Hz through the linac and the undulator, and the resulting FEL radiation into one of the experimental hutches. With two bunches per rf pulse, each pulse could feed either two experiments or one experiment in a pump-probe type configuration. Two-bunch FEL operation has already been briefly tested at the LCLS, and works reasonably well, although not yet routinely. In this re… more
Date: October 17, 2011
Creator: Bane, K.
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B to tau Leptonic and Semileptonic Decays

Description: Decays of B mesons to states involving {tau} leptons can be used as a tool to search for the effects of new physics, such as those involving a charged Higgs boson. The experimental status of the decays B {yields} {tau}{nu} and B {yields} D{sup (*)}{tau}{nu} is discussed, together with limits on new physics effects from current results. Leptonic and semileptonic decays of B mesons into states involving {tau} leptons remain experimentally challenging, but can prove a useful tool for constraining … more
Date: November 17, 2011
Creator: Barrett, M. & U., /Brunel
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open access

The Dawn of Nuclear Photonics with Laser-based Gamma-rays

Description: A renaissance in nuclear physics is occurring around the world because of a new kind of incredibly bright, gamma-ray light source that can be created with short pulse lasers and energetic electron beams. These highly Mono-Energetic Gamma-ray (MEGa-ray) sources produce narrow, laser-like beams of incoherent, tunable gamma-rays and are enabling access and manipulation of the nucleus of the atom with photons or so called 'Nuclear Photonics'. Just as in the early days of the laser when photon manip… more
Date: March 17, 2011
Creator: Barty, C J
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open access

International Conference on Surface X-ray and Neutron Scattering (SXNS-11)

Description: The 11th International Surface X-ray and Neutron Scattering (SXNS) Conference was held on July 13-17, 2010, on the Northwestern University (NU) campus, in Evanston Illinois and hosted by the NU Materials Research Science and Engineering Center. This biennial conference brought together a community of 164 attendees from 16 countries. The field now makes use of a broad range of new experimental capabilities that have been made possible through the development of increasingly brilliant X-ray and n… more
Date: June 17, 2011
Creator: Bedzyk, Michael J.
Item Type: Refine your search to only Report
open access

Intelligence Issues for Congress

Description: To address the challenges facing the U.S. intelligence community in the 21st century, congressional and executive branch initiatives have sought to improve coordination among the different agencies and to encourage better analysis. In December 2004, the Intelligence Reform and Terrorism Prevention Act (P.L. 108-458) was signed, providing for a Director of National Intelligence (DNI) with substantial authorities to manage the national intelligence effort. The legislation also established a separ… more
Date: May 17, 2011
Creator: Best, Richard A., Jr.
Item Type: Refine your search to only Report
open access

The Super-B Project Accelerator Status

Description: The SuperB project is an international effort aiming at building in Italy a very high luminosity e{sup +}e{sup -} (10{sup 36} cm{sup -2} sec{sup -1}) asymmetric collider at the Y(4S) energy in the CM. The accelerator design has been extensively studied and changed during the past year. The present design, based on the new collision scheme, with large Piwinski angle and the use of 'crab waist' sextupoles already successfully tested at the DA{Phi}NE {Phi}-Factory at LNF Frascati, provides larger … more
Date: August 17, 2011
Creator: Biagini, M.E.; Alesini, D.; Boni, R.; Boscolo, M.; Demma, T.; Drago, A. et al.
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open access

Contractor Sales Training: Providing the Skills Necessary to Sell Comprehensive Home Energy Upgrades

Description: Many comprehensive home energy efficiency programs rely on contractors as the customer-facing ‘front line’ to sell energy improvements. Adding sales skills to contractors’ existing technical expertise is key to converting more assessments into comprehensive home energy upgrades. Leading programs recognize the need to support contractors with sales and business training to help them succeed and to support the growth of the home performance industry for the long term. A number of contractor sales… more
Date: August 17, 2011
Creator: Billingsley, Megan & Stuart, Elizabeth
Item Type: Refine your search to only Report
open access

Probing the Linear Polarization of Gluons in Unpolarized Hadrons at EIC

Description: Gluons inside unpolarized hadrons can be linearly polarized provided they have a nonzero transverse momentum. The simplest and theoretically safest way to probe this TMD distribution of linearly polarized gluons is through cos 2{phi} asymmetries in heavy quark pair or dijet production in electron-hadron collisions. Future EIC or LHeC experiments are ideally suited for this purpose. Here we estimate the maximum asymmetries for EIC kinematics.
Date: August 17, 2011
Creator: Boer, Daniel; Brodsky, Stanley J.; Mulders, Piet J. & Pisano, Cristian
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open access

Presidential Appointments, the Senate's Confirmation Process, and Proposals for Change, 112th Congress

Description: The responsibility for populating top positions in the executive and judicial branches of government is shared, with the President having the power of appointment and the Senate having the power of advice and consent. This report provides a brief background on advice and consent issues, an overview of the appointment process in both the executive and legislative branches, and a brief discussion of recent concerns about the system. Next, the report explores the events in the 112th Congress leadi… more
Date: July 17, 2011
Creator: Carey, Maeve P. & Palmer, Betsy
Item Type: Refine your search to only Report
open access

The Role of Eddy-Tansport in the Thermohaline Circulation

Description: Several research themes were developed during the course of this project. (1) Low-frequency oceanic varibility; (2) The role of eddies in the Antarctic Circumpolar Current (ACC) region; (3) Deep stratification and the overturning circulation. The key findings were as follows: (1) The stratification below the main thermocline (at about 500m) is determined in the circumpolar region and then communicated to the enclosed portions of the oceans through the overturning circulation. (2) An Atlantic po… more
Date: November 17, 2011
Creator: Cessi, Dr. Paola
Item Type: Refine your search to only Report
open access

North Korea: U.S. Relations, Nuclear Diplomacy, and Internal Situation

Description: This report provides background information on the negotiations over North Korea's nuclear weapons program that began in the early 1990s under the Clinton Administration. As U.S. policy toward Pyongyang evolved through the George W. Bush presidency and into the Obama Administration, the negotiations moved from mostly bilateral to the multilateral Six-Party Talks (made up of China, Japan, Russia, North Korea, South Korea, and the United States).
Date: June 17, 2011
Creator: Chanlett-Avery, Emma
Item Type: Refine your search to only Report
open access

Afghanistan Casualties: Military Forces and Civilians

Description: This report collects statistics from a variety of sources on casualties sustained during Operation Enduring Freedom (OEF), which began on October 7, 2001, and is ongoing. OEF actions take place primarily in Afghanistan; however, OEF casualties also includes American casualties in Pakistan, Uzbekistan, Guantanamo Bay (Cuba), Djibouti, Eritrea, Ethiopia, Jordan, Kenya, Kyrgyzstan, the Philippines, Seychelles, Sudan, Tajikistan, Turkey, and Yemen.
Date: February 17, 2011
Creator: Chesser, Susan G.
Item Type: Refine your search to only Report
open access

High Resolution Simulations of Ignition Capsule Designs for the National Ignition Facility

Description: Ignition capsule designs for the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 443, 2841 (2004)] have continued to evolve in light of improved physical data inputs, improving simulation techniques, and - most recently - experimental data from a growing number of NIF sub-ignition experiments. This paper summarizes a number of recent changes to the cryogenic capsule design and some of our latest techniques in simulating its performance. Specifically, rece… more
Date: February 17, 2011
Creator: Clark, D. S.; Haan, S. W.; Cook, A. W.; Edwards, M. J.; Hammel, B. A.; Koning, J. M. et al.
Item Type: Refine your search to only Article
open access

The Uniformed and Overseas Citizens Absentee Voting Act: Overview and Issues

Description: This report discusses the Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA), under which members of the uniformed services and U.S. citizens who live abroad are eligible to register and vote absentee in federal elections. The report discusses recent improvements to UOCAVA, necessary as teh result of controversy surrounding ballots received in Florida from absentee voters in the 2000 presidential election. The report also discusses related legislation, such as the National Defense Aut… more
Date: February 17, 2011
Creator: Coleman, Kevin J.
Item Type: Refine your search to only Report
open access

The Uniformed and Overseas Citizens Absentee Voting Act: Overview and Issues

Description: Members of the uniformed services and U.S. citizens who live abroad are eligible to register and vote absentee in federal elections under the Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA, P.L. 99-410, 42 U.S.C.1973ff) of 1986. The law was enacted to improve absentee registration and voting for this group of voters and to consolidate existing laws. Since 1942, a number of federal laws have been enacted to assist these voters: the Soldier Voting Act of 1942 (amended in 1944), the F… more
Date: February 17, 2011
Creator: Coleman, Kevin J.
Item Type: Refine your search to only Report
open access

Air Corrosivity in U.S. Outdoor-Air-Cooled Data Centers is Similar to That in Conventional Data Centers

Description: There is a concern that environmental-contamination caused corrosion may negatively affect Information Technology (IT) equipment reliability. Nineteen data centers in the United States and two in India were evaluated using Corrosion Classification Coupons (CCC) to assess environmental air quality as it may relate IT equipment reliability. The data centers were of two basic types: closed and outside-air cooled. A closed data center provides cool air to the IT equipment using air conditioning in … more
Date: July 17, 2011
Creator: Coles, Henry C.; Han, Taewon; Price, Phillip N.; Gadgil, Ashok J. & Tschudi, William F.
Item Type: Refine your search to only Report
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