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Title: Calibration of Liquid Scintillators: III. Clock Synchronization between Scintillators

Abstract

The purpose of this report is to document the procedure used to perform the module-to-module clock synchronization of the liquid scintillators.

Authors:
 [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1358315
Report Number(s):
LLNL-TR-731500
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 47 OTHER INSTRUMENTATION

Citation Formats

Verbeke, J. M., and Ouedraogo, S. A. Calibration of Liquid Scintillators: III. Clock Synchronization between Scintillators. United States: N. p., 2017. Web. doi:10.2172/1358315.
Verbeke, J. M., & Ouedraogo, S. A. Calibration of Liquid Scintillators: III. Clock Synchronization between Scintillators. United States. doi:10.2172/1358315.
Verbeke, J. M., and Ouedraogo, S. A. Thu . "Calibration of Liquid Scintillators: III. Clock Synchronization between Scintillators". United States. doi:10.2172/1358315. https://www.osti.gov/servlets/purl/1358315.
@article{osti_1358315,
title = {Calibration of Liquid Scintillators: III. Clock Synchronization between Scintillators},
author = {Verbeke, J. M. and Ouedraogo, S. A.},
abstractNote = {The purpose of this report is to document the procedure used to perform the module-to-module clock synchronization of the liquid scintillators.},
doi = {10.2172/1358315},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu May 18 00:00:00 EDT 2017},
month = {Thu May 18 00:00:00 EDT 2017}
}

Technical Report:

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  • This report presents the results of the neutron and photon calibration of a Bicron BC-420 plastic scintillator and a BC-501 liquid scintillator using a set of reference gamma sources and a Cf-252 source. The position of neutron and photon detection inside the scintillators as a function of energy is investigated by Monte Carlo simulation.
  • Expressions for the quantum yield of fluorescence of aromatic hydrocarbons in benzene and alkylbenzenes were derived assuming zero internal quenching. These expressions indicate that the molecular quantum yield of fluorescence increases with the lifetime of the first excited singlet state of the solvent, the transition probabilities from the levels of the solute that correspond to the levels involved in the excitation of the solvent, and the increase in the degree of degeneracy in the solute levels corresponding to those involved in the excitation of the solvent. Minimum values of the molecular quantum yield of fluorescence of a group of aromaticmore » hydrocarbons were computed at different concentrations of the solutes. The compounds with the highest values are p-divinylanthracene, perylene, p-quaterphenyl and p-terphenyl. The dimensions of the excited aggregates that are formed by scintillators are estimated from Basile's data for solutions of PBD in polyvinyltoluene. The number of monomer units per aggregate is about 1250 and the radius of interaction about l8 A. The quenching of fluorescence by O is explained by the existence of pi electron level pairs of almost similar energy difference in the solvent and the solvent-oxygen complex, and by the short lifetime of the complex compared with that of the solvent. The latter results from the lower order of symmetry of the complex in comparison with that of the pi electron system in benzene. (auth)« less
  • Algorithms for synchronizing the times and frequencies of the clocks of Intel and Ncube hypercube multiprocessors are presented. Bounds for the error in estimating clock offsets and frequencies are formulated in terms of the clock read error and message transmission time. Clock and communication performance of the Ncube and Intel hypercubes are analyzed, and performance of the synchronization algorithms is presented. 14 refs., 4 figs., 3 tabs.