118559630
Inner Structure and Outer Limits: Precision QCD and Electroweak Tests from Neutrino Experiments
117015501
Recent Structure Function Results from CCFR
A new structure function analysis of CCFR deep inelastic nu-N and nubar-N scattering data is presented for previously unexplored kinematic regions down to Bjorken x=0.0045 and Q^2=0.3 GeV^2. Comparisons to charged lepton scattering data from NMC and E665 experiments are made and the behavior of the structure function F2_nu is studied in the limit Q^2 -> 0
121978152
Neutrino Scattering in Liquid Argon TPC Detectors
195859032
Photomultiplier tube testing for the MiniBooNE experiment
The recent discoveries in the neutrino sector in the Standard Model have opened a new frontier in high energy physics. Understanding neutrinos and how they interact is crucial to continuing to verify the Standard Model and look for beyond Standard Model physics. The MiniBooNE experiment is a /spl nu//sub /spl mu///spl rarr//spl nu//sub e/ oscillation search designed to confirm or rule out the neutrino oscillation signal seen by the LSND experiment at the Los Alamos National Laboratory. The MiniBooNE detector, a sphere filled with mineral oil and lined with 8" Hamamatsu photomultiplier tubes (PMTs), uses Cerenkov imaging to identify /spl nu//sub /spl mu// and /spl nu//sub e/ interactions. The PMTs are the main detector component and must be well understood. They underwent a series of tests to determine their functionality and figures of merit in order to be placed in the detector, as described here.
18440205
Photomultiplier tubes in the MiniBooNE experiment
The detector for the MiniBooNE [Proposal for the MiniBooNE experiment: hhttp://www-boone.fnal.gov/publicpages/proposal.psi] experiment at the Fermi National Accelerator Laboratory employs 1520 8 in. Hamamatsu models R1408 and R5912 photomultiplier tubes with custom-designed bases. Tests were performed to determine the dark rate, charge and timing resolutions, double-pulsing rate, and desired operating voltage for each tube, so that the tubes could be sorted for optimal placement in the detector. Seven phototubes were tested to find the angular dependence of their response. After the Super-K phototube implosion accident, an analysis was performed to determine the risk of a similar accident with MiniBooNE. r 2006 Elsevier B.V. All rights reserved.
5665227
Project Lyman
We explore the design of a space mission called Project Lyman that has the goal of quantifying the ionization history of th e universe from the present epoch to a redshift of z∼ 3. Observations from WMAP and SDSS show that before a redshif t of z∼> 6 the first collapsed objects, possibly dwarf galaxies, emit t d Lyman continuum (LyC) radiation shortward of 912 Å that reionized most of the universe. Theoretical estimates of the LyC escape fraction ( fesc) required from these objects to complete reionization isfesc∼ 10%. How LyC escapes from galactic environments, whether it induces positive or negative feedback on the local and global collapse of structures, and the role played by clumping, molecules, metallicity and dus t are major unanswered theoretical questions, requiring observ ational constraint. Numerous intervening Lyman limit syst ems frustrate the detection of LyC from high z objects. They thin below z∼ 3 where there are reportedly a few cases of apparently very highfesc. At low z there are only controversial detections and a handful of upp er limits. A wide-field multi-object spectroscopic survey with moderate spectral and spatial resolution can quantify esc within diverse spatially resolved galactic environments over redshifts with signifi cant evolution in galaxy assemblage and quasar activity. It can also calibrate LyC escape against Ly α escape, providing an essential tool to JWST for probing the b eginnings of reionization. We present calculations showing the evolution of the charac te istic apparent magnitude of star-forming galaxy lumino s ty functions at 900Å, as a function of redshift and assumed escape fraction. The se calculations allow us to determine the required aperture for detecting LyC and conduct trade studi es to guide technology choices and balance science return against mission cost. Finally we review our efforts to build a pathfinding dual order multi-object spectro/telescope wi th a (0.5◦)2 field-of-view, using a GSFC microshutter array, and crossed delay-line micro-channel plate detector.
1601826
Calibration and flight performance of the long-slit imaging dual order spectrograph
We present preliminary results for the calibration and flight performance of the Long-Slit Imaging Dual Order Spectrograph (LIDOS), a rocket-borne instrument with a large dynamic range in the 900 - 1650 Å bandpass. The instrument observes UV-bright objects with a CCD channel and fainter nebulosity with an MCP detector. The image quality and the detector quantum efficiencies were determined using the calibration and test equipment at the Johns Hopkins University, and further monitored using an on-board electron-impact calibration lamp. We review results from each of the three flights of the instrument.