NASA Scientific and Technical Aerospace Reports

20040111134 Lund Univ., Sweden, California Univ., Davis, CA, USA, California Univ., Lawrence Berkeley National Lab.,
Berkeley, CA, USA
Bottom Production Asymmetries at the LHC
Norrbin, E.; Vogt, R.; Mar. 2000; 18 pp.; In English
Report No.(s): DE2004-822605; LBNL-45275; No Copyright; Avail: Department of Energy Information Bridge
We present results on bottom hadron production asymmetries at the LHC within both the Lund string fragmentation model
and the intrinsic bottom model. The main aspects of the models are summarized and specific predictions for pp collisions at
14 TeV are given. Asymmetries are found to be very small at central rapidities increasing to a few percent at forward rapidities.
At very large rapidities intrinsic production could dominate but this region is probably out of reach of any experiment.
NTIS
Hadrons; Fragmentation; Particle Collisions
20040111135 California Univ., Lawrence Berkeley National Lab., Berkeley, CA, USA
Recent Results in High pi(sub t) Physics from CDF
Veramendi, G. F.; Mar. 2004; 26 pp.; In English
Report No.(s): DE2004-821892; FERMILAB-CONF-03/205-E; No Copyright; Avail: Department of Energy Information
Bridge
The authors present the most recent high p(sub T) results from the CDF experiment using p(bar p) collisions at(radical)s=
1.96 TeV produced at the Tevatron Collider at Fermilab. They summarize results in electroweak physics, top physics and
searches for physics beyond the Standard Model. Many measurements of important signals like W boson, Z boson, and the
top quark have been reestablished. Taking advantage of the increase in energy and detector upgrades, these measurements
already begin to be competitive with previous results.
NTIS
Electroweak Interactions (Field Theory); Particle Accelerators
20040111136 Lawrence Livermore National Lab., Livermore, CA
Influence of BK7 Substrate Solarization on the Performance of Hafnia and Silica Multilayer Mirrors
Stolz, C. J.; Menapace, J. A.; Genin, F. Y.; Ehrmann, P. R.; Miller, P. E.; Nov. 26, 2002; In English
Report No.(s): DE2003-15005451; UCRL-JC-148404; No Copyright; Avail: National Technical Information Service (NTIS)
Transport mirrors within the National Ignition Facility, a 192-beam 4-MJ fusion laser at 1053 nm, will be exposed to
backscattered light from plasmas created from fusion targets and backlighters. This backscattered light covers the UV and
visible spectrum from 351-600 nm. The transport mirror BK7 substrates will be intentionally solarized to absorb>95% of the
backscattered light to prevent damage to the metallic mechanical support hardware. Solarization has minimal impact on the
351- and 1053-nm laser-induced damage threshold or the reflected wavefront of the multilayer hafnia silica coating. Radiation
sources of various energies were examined for BK7 darkening efficiency within the UV and visible region with 1.1 MeV
gamma rays from a Cobalt 60 source ultimately being selected. Finally, bleaching rates were measured at elevated
temperatures to generate a model for predicting the lifetime at ambient conditions (20 C), before solarized BK7 substrates
exceed 5% transmission in the UV and visible region. Over a 30-mm thickness, BK7 glass will bleach in 10 years to 5%
transmission at 600 nm, the most transmissive wavelengths over the 351-600 nm regions.
NTIS
Substrates; Ultraviolet Spectra; Silicon Dioxide; Gamma Rays; Backscattering
20040111139 Lawrence Livermore National Lab., Livermore, CA
Paper-Less CAD/CAM for Accelerator Components
Franks, R. M.; Alford, O.; Bertolini, L. R.; 2004; In English
Report No.(s): DE2003-15005494; No Copyright; Avail: National Technical Information Service (NTIS)
Computer-aided design and manufacture (CAD/CAM) have enabled advances in the design and manufacture of many
accelerator components, though government procurement rules tend to inhibit its use. We developed and executed a method
that provides adequate documentation for the procurement process, industrial vendor manufacturing processes, and laboratory
installation activities. We detail our experiences in the design and manufacture of 60 separate and unique PEP-II Low Energy
Ring Interaction Region vacuum chambers totaling(approx) 140m in length as an example of how we used this technique,
reducing design effort and manufacturing risk while streamlining the production process. We provide ‘lessons learned’ to
better implement and execute the process in subsequent iterations. We present our study to determine the estimated savings
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