NASA Scientific and Technical Aerospace Reports

I report two significant figures. The values come from ICP-ES and ICP-MS measurements. I give the detection limit for the
more sensitive technique in the table under the ‘MDL’ heading. In case where only one technique was used, I give the MDL
for that technique in parentheses after the impurity value in the table. Since these measurements were made, changes in
instrumentation have resulted in significant improvements in many of the detection limits. Unfortunately, we no longer have
any of the KDP boules from this time period. We now are concentrating on deuterated KDP, which we cannot send to you.
I also am not able to locate any database of absorption spectra, which correspond to the impurity measurements for the
attached data.
NTIS
Crystals; Deuterium Compounds
20040050348 Thomas Jefferson National Accelerator Facility, Newport News, VA, USA
Low and Intermediate Beta Cavity Design-A Tutorial
Delayen, J. R.; 2003; 14 pp.; In English
Report No.(s): DE2004-820178; No Copyright; Avail: Department of Energy Information Bridge
The design of low-velocity superconducting structures has been an active area of the superconducting rf (srf) technology
for more than 3 decades. More recently, with the growing interest in medium-energy ion and proton accelerators, a sustained
world-wide effort has been directed toward the development of the superconducting structures for the intermediate velocity
region. In this tutorial we address the design issues that are specific to low- and medium-velocity superconducting cavities.
Simple electrostatic and electrodynamic models based on transmission lines are presented, and scaling laws are derived.
NTIS
Superconductivity; Cavities
20040050357 Lawrence Livermore National Lab., Livermore, CA
Completeness Criterion in Atomic Modeling
Liedahl, D.; Apr. 03, 2000; 14 pp.; In English
Report No.(s): DE2004-15005857; UCRL-JC-139120; No Copyright; Avail: Department of Energy Information Bridge
The author discusses two variations on the completeness theme in atomic modeling: missing lines as they affect the
performance of spectral synthesis codes, and missing configurations as they affect the theoretical emissivities of bright lines,
with emphasis on the latter. It is shown that the detrimental effects of working with incomplete atomic models can overshadow
those brought about by working with less-than-perfect atomic rates. Atomic models can be brought up to an acceptable level
of completeness in a fairly straightforward manner, and on a reasonably short timescale, whereas the long-term goal of
comprehensive accuracy is unlikely to be reached on the timescale of the current generation of X-ray observatories. A
near-term, albeit imperfect, solution is to hybridize atomic models used to synthesize spectra.
NTIS
Atomic Spectra; Emissivity; Line Spectra
20040050364 Radiation Monitoring Devices, Inc., Watertown, MA, USA
Fast, High Light Output Scintillator for Gamma Ray and Neutron Detection
Entine, G.; Shah, K. S.; Cirignano, L.; Glodo, J.; Van Loef, E. V.; Dec. 2003; 10 pp.; In English
Report No.(s): DE2004-820558; No Copyright; Avail: Department of Energy Information Bridge
In radiation detection systems employing scintillation crystals for the detection of high-energy particles such as x-rays or
neutrons, the scintillator often limits the performance of the system. Ideally, a scintillator should have a high light yield for
good energy and position resolution, a fast response time for good time resolution and high density and atomic number Z for
efficient x-ray detection. The latter property is of less importance in the case of (thermal) neutron detection. Obviously, there
are many other criteria such as transparancy of the material to its own emission, ease of crystal growth, etc. However, there
is no commercially available material that meets all these criteria and the choice for a particular scintillator is often a
compromise among these and other factors.
NTIS
Gamma Rays; Scintillation Counters; Detection; Thermal Neutrons; Radiation Measurement
20040050370 Lawrence Livermore National Lab., Livermore, CA
NLC Interaction Region Layout and Background Estimates
Gronberg, J.; Hertzbach, S. S.; Keller, L.; Markiewicz, T.; Maruyama, T.; Feb. 01, 2001; 12 pp.; In English
Report No.(s): DE2004-15006294; UCRL-JC-142271; No Copyright; Avail: Department of Energy Information Bridge
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