NASA Scientific and Technical Aerospace Reports

needs to understand the relationship between pH and resistivity of the diluted BCP mix. This report is an attempt to address
these issues.
NTIS
Polishing; Ph; Electrical Resistivity
20040120853 Fermi National Accelerator Lab., Batavia, IL, USA
E781 Hyperon Spectrometer Constants
Lach, J.; May 04, 2004; 16 pp.; In English
Report No.(s): DE2004-823428; FERMILAB-TM-2128; No Copyright; Avail: Department of Energy Information Bridge
This is a discussion of the physical measurements, sizes, distances and magnetic fields of the Hyperon Spectrometer
Magnet and its components. Some we get from construction drawings (like the target dimensions) and others from
measurements in differing coordinate systems. Included also are the properties of the hyperon productions targets used in
E781.
NTIS
Spectrometers; Dimensional Measurement
20040120854 California Univ., Lawrence Berkeley National Lab., Berkeley, CA, USA, California Univ., Berkeley, CA,
USA
Evaluation of Si(Li) Detectors for Use in Compton Telescopes
Tindall, C.; Hau, I. D.; Luke, P. N.; May 2002; In English
Report No.(s): DE2004-823269; LBNL-50234; No Copyright; Avail: National Technical Information Service (NTIS)
Si(Li) detectors are currently being developed for use in large Compton telescopes. A major advantage of silicon when
compared with germanium is its ability to operate at significantly higher temperature. To determine the feasibility of using
Si(Li) detectors in a Compton telescope, their performance as a function of temperature has been studied. We present leakage
current, noise data and gamma-ray spectral performance at various temperatures for single 6-mm thick planar devices. It has
been determined that for detectors without a guard ring, the noise began to rise significantly around 210K. Adding a guard
ring improved the leakage current by about an order of magnitude and reduced the total noise (detector plus electronics) by
about 25 percent. The noise of the detectors with(approx)130 mm2 area and a guard ring did not exceed our performance goal
of 2 keV FWHM until the temperature was approximately 240K. For 122 keV gamma rays, no evidence of ballistic deficit
was seen at 8 ms peaking time and bias voltages corresponding to an internal electric field of(approx)1150 V/cm. Some
evidence of ballistic deficit was seen for 662 keV gamma rays at temperatures above 220K.
NTIS
Telescopes; Silicon; Lithium
20040120855 California Univ., Lawrence Berkeley National Lab., Berkeley, CA, USA
Jets as a Probe of Dense Matter at RHIC
Filimonov, K.; 2004; In English
Report No.(s): DE2004-822980; No Copyright; Avail: National Technical Information Service (NTIS)
Jet quenching in the matter created in high energy nucleus-nucleus collisions provides a tomographic tool to probe the
medium properties. Recent experimental results on jet production at the Relativistic Heavy-Ion Collider (RHIC) are reviewed.
Jet properties in p+p and d+Au collisions have been measured, establishing the baseline for studying jet modification in
heavy-ion collisions. Current progress on detailed studies of high transverse momentum production in Au+Au collisions is
discussed, with an emphasis on dihadron correlation measurements.
NTIS
Nuclear Interactions; Tomography
20040120856 Fermi National Accelerator Lab., Batavia, IL, USA
Indicators of the Energy Error in the Linac to Booster Transfer
Yang, X.; MacLachlan, J.; Apr. 2004; 20 pp.; In English
Report No.(s): DE2004-822915; FERMILAB-TM-2240; No Copyright; Avail: Department of Energy Information Bridge
The match between the Linac beam energy and the energy determined by the bending field of the Booster magnets is
crucial for rf capture, beam quality, and the transmission efficiency in a Booster cycle. The observation of the injection energy
match is important for injection tuning. Several signals, such as phase shift drive (PSD), radial position error (RPOS),
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