We designed laser-pumped cesium vapor magnetometers in the M x configuration for the control and stabilization of magnetic field fluctuations and gradients in a new experiment searching for a permanent electric dipole moment of the neutron. The intrinsic sensitivity of the device was determined to be 30 fT in a measurement bandwidth of 1 Hz, limited by laser noise. In the shot noise limit the m...

We report results of an experiment conducted in May 1997 to measure CdZnTe background and background reduction schemes in space flight conditions similar to those of proposed hard X-ray astrophysics missions. A 1 cm CdZnTe detector was placed adjacent to a thick BGO anticoincidence shield and flown piggybacked onto the EXITE2 scientific balloon payload. The planar shield was designed to veto ba...

Detailed activation analyses have been performed for the different blanket design options considered in the ITER blanket option trade-off study. The options considered included a selfcooled Li/V option, a helium cooled Li/V option, and a water cooled 316 SS non-breeding shield option. A vacuum vessel made of double wall inconel 625 and water cooled 316 SS balls is used with all options. The He-...

In recent years, much attention has been dedicated to finding techniques reduce exposure doses. This work examines the effectiveness of using serpentine concrete shield a neutron source 241Am-Be facility at National Nuclear Research Institute (NNRI) as case study. The results obtained for both neutrons and gamma indicate that provides better shielding compared ordinary concrete. At distance 100...

While cosmic ray muons themselves are relatively easy to veto in underground detectors, their interactions with nuclei create more insidious backgrounds via: (i) the decays of long-lived isotopes produced by muon-induced spallation reactions inside the detector, (ii) spallation reactions initiated by fast muon-induced neutrons entering from outside the detector, and (iii) nuclear recoils initia...

A neutron diagnostic for inertial confinement fusion (ICF) experiments was designed and fabricated that is suitable for both the OMEGA and National Ignition Facility (NIF) laser systems. The diagnostic measures the spectrum of fusion neutrons that are generated at peak compression. The neutrons are downshifted, or lose energy, as they escape depending on the areal density (ρr) of the imploded t...

rameterized for a given porous medium by slope and intercept values obtained through field calibration (HigThe neutron thermalization method for soil water content measurenett and Evett, 2002). For probe designs common in the ment is well established as being accurate for deep soil profile measurements. However, the method has been criticized as inaccurate for 1960s, about 95% of the measured s...

INTRODUCTION For neutron energies above 20 MeV, measured doubly differential cross-section data is sparse and most accelerator neutronics calculations are performed using Monte Carlo codes employing highenergy stochastic collision models. Monte Carlo methods are very well suited for analyzing geometrically complex systems. However, often they are computationally expensive when used for accelera...

The helium-cooled pebble bed (HCPB) breeding blanket (BB) is one of the two driver-blanket candidates for European DEMO fusion reactor. Recent design activities were focused, among other objectives, on achievement an efficient shielding system to adequately protect vacuum vessel (VV) and toroidal field coils (TFCs). Several options have been studied in terms architecture (e.g., in-BB shield ex-...