DOE programs in fire and materials

Diverse laboratory experiments and a review of the most recent dose rate data from operating plants have identified key factors responsible for the increase in shutdown radiation fields at a number of BWRs following implementation of HWC. This information suggests strategies to minimize radiation field increases under HWC and to avoid possible problems during chemical decontamination. The results from corrosion release and activity deposition laboratory experiments, performed under NWC, HWC, and cycling conditions, and the chemistry and structure of films that form under cycling conditions were compiled and reviewed. Operating plant experience under HWC, including the on-line gamma spectroscopy measurements performed at Hope Creek, was also studied. The radiation buildup measurements at Monticello, Brunswick-2, and Duane Arnold were also considered. The focus was to identify those areas that provided a general consensus about the factors responsible for activity buildup under HWC. Once this task was accomplished, the information was used to identity procedures that plant operators could utilize to mitigate undesirable effects

Exploring Minimal Scenarios to Produce Transversely Bright Electron Beams Using the Eigen-Emittance Concept

Next generation hard X-ray free electron lasers require electron beams with low transverse emittance. One proposal to achieve these low emittances is to exploit the eigen-emittance values of the beam. The eigen-emittances are invariant under linear beam transport and equivalent to the emittances in an uncorrelated beam. If a correlated beam with two small eigen-emittances can be produced, removal of the correlations via appropriate optics will lead to two small emittance values, provided non-linear effects are not too large. We study how such a beam may be produced using minimal linear correlations. We find it is theoretically possible to produce such a beam, however it may be more difficult to realize in practice. We identify linear correlations that may lead to physically realizable emittance schemes and discuss promising future avenues.Comment: 7 pages, 2 figures, to appear in NIM

Flamingo Vol. I N 4

Orange Owl. Off Again . Prose. 1. Jester. Alas! . Prose. 1. Anonymous. Untitled. Prose. 1. Purple Cow. Untitled. Prose. 1. Banter. Untitled. Prose. 1. Burr. Pride . Prose. 2. Lampoon. Untitled. Prose. 2. The Goblin. Untitled. Prose. 2. Exchange. Untitled. Prose. 2. Tiger. Untitled. Prose. 2. Chaparral. O, Dear! Prose. 2. Hicks, H. Leslie. Untitled. Picture. 3. Anonymous. Denison Customs We Don\u27t Want Revived . Prose. 4. Wellman, Chester. Buffalo George . Prose. 5. Bovington, R.D. Avery The Anxious . Prose. 9. D.U.K. Spring In a Poetic Lie Sense . Prose. 10. Anonymous. Yeh? . Prose. 10. Anonymous. A Review . Prose. 10. George. Vest Pocket Views . 11 Anonymous. Untitled. Prose. 11. The Siren. Untitled. Prose. 11. Montgomery, E.E. Commencement in 1871 . Prose. 12. Anonymous. A Riddle . Poem. 12. Anonymous. Song From Pippa Passes . Poem. 12. Orange Peel. Untitled. Prose. 12. Jug. Sad News . Prose. 12. Anonymous. Untitled. Prose. 14. Keeler, Clyde E. Picture. 16. G.W.B. Butterflies . Poem. 18. C.E.K. Scientific Sonnett . Poem. 18. Anonymous Untitled. Poem. 18. T.P.G. Twilight . Poem. 18. R.D.B. Untitled. Poem. 18. G.W.B. Use of The Immaterial . Poem. 18. Anonymous. Untitled. Prose. 19. Anonymous. Untitled. Picture. 19. Anonymous. Tuff . Prose. 19. Octopus. Untitled. Prose. 19. Panther. Untitled. Prose. 19. Orange Ade. The Fable of the Scheming Sisters . Prose. 19. Anonymous. Untitled. Prose. 20. Brown Jug. Untitled. Prose. 20. Potter, W.M. Letters Of A Japanese Sandman . Prose. 20. Anonymous. Well Known Seniors . Prose. 21. Hicks. Well-Known Seniors . Picture. 21. Anonymous. A Chemical Drama . Prose. 22. R.D.B. Untitled. Picture. 23 Anonymous. News of The Month . Prose. 23. Anonymous. Student Philosophy . Prose. 23. Anonymous. Untitled. Prose. 23. Keeler, Clyde. Empty? Picture. 26. Grogan. Untitled. Picture. 27. Anonymous. Untitled. Prose. 27. Drexerd. Untitled. Prose. 27. Mugwump. Untitled. Prose. 27. Sun Dodger. Circumstantial Evidence . Poem. 27. Pelican. Jailed toot Sweet . Prose. 27. Chaparral. Untitled. Prose. 27. Brown Jug. Untitled. Prose. 27. Tiger. Untitled. Prose. 27. Siren. Untitled. Prose. 27. Puppet. Untitled. Prose. 27. Widow. Untitled. Prose. 27. Yale Record. Untitled. Prose. 27. Frivol. Untitled. Prose. 27. Gorkus. Untitled. Poem. 28. Dirge. Untitled. Prose. 28. Exchange. Untitled. Prose. 28. Anonymous. Untitled. prose. 29. Anonymous. Ye Wise Virgin . Prose. 30. Froth. Overheard At The Hashery . Prose. 30 Reel, Virginia. Untitled. Prose. 30. Keeler, Clyde. Untitled. Picture. 31. Banter. Untitled. Prose. 31. Puppet. Untitled. Prose. 31. Banter. Untitled. Prose. 31. Jester. Untitled. Prose. 32. Record. Untitled. Prose. 32. Anonymous. A Cultivated Joke . Prose. 32. Lampoon. Untitled. Prose. 32. Exchange. Untitled. Prose. 32. J.M. Untitled. Picture. 31. J.M. Untitled. Picture. 32. Holt, Kilburn. Bo-Peep As She Might Have Been Sung By--- . Poem. 8. Peterson, Louise. Helpful hints For Heedless Horsewomen . Prose. 11

AGN effect on cooling flow dynamics

We analyzed the feedback of AGN jets on cooling flow clusters using three-dimensional AMR hydrodynamic simulations. We studied the interaction of the jet with the intracluster medium and creation of low X-ray emission cavities (Bubbles) in cluster plasma. The distribution of energy input by the jet into the system was quantified in its different forms, i.e. internal, kinetic and potential. We find that the energy associated with the bubbles, (pV + gamma pV/(gamma-1)), accounts for less than 10 percent of the jet energy.Comment: "Accepted for publication in Astrophysics & Space Science

The small x gluon and b\bar{b} production at the LHC

We study open b\bar{b} production at large rapidity at the LHC in an attempt to pin down the gluon distribution at very low x. For the LHC energy of 7 TeV, at next-to-leading order (NLO), there is a large factorization scale uncertainty. We show that the uncertainty can be greatly reduced if events are selected in which the transverse momenta of the two B-mesons balance each other to some accuracy, that is |\vec p_{1T}+\vec p_{2T}| < k_0. This will fix the scale \mu_F \simeq k_0, and will allow the LHCb experiment, in particular, to study the x-behaviour of gluon distribution down to x ~ 10^{-5}, at rather low scales, \mu ~ 2 GeV. We evaluate the expected cross sections using, for illustrative purposes, various recent sets of Parton Distribution Functions.Comment: 13 pages, 5 figure

B Production Asymmetries in Perturbative QCD

This paper explores a new mechanism for B production in which a b quark combines with a light parton from the hard-scattering process before hadronizing into the B hadron. This recombination mechanism can be calculated within perturbative QCD up to a few nonperturbative constants. Though suppressed at large transverse momentum by a factor Lambda_QCD m_b/p_t^2 relative to b quark fragmentation production, it can be important at large rapidities. A signature for this heavy-quark recombination mechanism in proton-antiproton colliders is the presence of rapidity asymmetries in B cross sections. Given reasonable assumptions about the size of nonperturbative parameters entering the calculation, we find that the asymmetries are only significant for rapidities larger than those currently probed by collider experiments.Comment: 17 pages, LaTeX, 4 ps figures, tightenlines, sections added, final version accepted for publication in Phys. Rev.

Gravitationally lensed QSOs in the ISSIS/WSO-UV era

Gravitationally lensed QSOs (GLQs) at redshift z = 1-2 play a key role in understanding the cosmic evolution of the innermost parts of active galaxies (black holes, accretion disks, coronas and internal jets), as well as the structure of galaxies at intermediate redshifts. With respect to studies of normal QSOs, GLQ programmes have several advantages. For example, a monitoring of GLQs may lead to unambiguous detections of intrinsic and extrinsic variations. Both kinds of variations can be used to discuss central engines in distant QSOs, and mass distributions and compositions of lensing galaxies. In this context, UV data are of particular interest, since they correspond to emissions from the immediate surroundings of the supermassive black hole. We describe some observation strategies to analyse optically bright GLQs at z of about 1.5, using ISSIS (CfS) on board World Space Observatory-Ultraviolet.Comment: 7 pages, 4 figures, Accepted for publication in Astrophysics & Space Scienc

Quasars and their host galaxies

This review attempts to describe developments in the fields of quasar and quasar host galaxies in the past five. In this time period, the Sloan and 2dF quasar surveys have added several tens of thousands of quasars, with Sloan quasars being found to z>6. Obscured, or partially obscured quasars have begun to be found in significant numbers. Black hole mass estimates for quasars, and our confidence in them, have improved significantly, allowing a start on relating quasar properties such as radio jet power to fundamental parameters of the quasar such as black hole mass and accretion rate. Quasar host galaxy studies have allowed us to find and characterize the host galaxies of quasars to z>2. Despite these developments, many questions remain unresolved, in particular the origin of the close relationship between black hole mass and galaxy bulge mass/velocity dispersion seen in local galaxies.Comment: Review article, to appear in Astrophysics Update

Definition and Calculation of Bottom Quark Cross-Sections in Deep-inelastic Scattering at HERA and Determination of their Uncertainties

The uncertainties involved in the calculation of bottom quark cross-sections in deep-inelastic scattering at HERA are studied in different phase space regions. Besides the inclusive bottom quark cross-section, definitions closer to the detector acceptance requiring at least one high energetic muon from the semi-leptonic \bquark decay or a jet with high transverse energy are investigated. For each case the uncertainties due to the choice of the renormalisation and factorisation scale as well as the \bquark mass are estimated in the perturbative NLO QCD calculation and furthermore uncertainties in the fragmenation of the bottom quark to a B-meson and in its semi-leptonic decay are discussed