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Experimental limits on neutrino oscillators

Description: Neutrino oscillations were sought in a wideband neutrino beam at Fermilab using the 15-foot bubble chamber. No evidence was found for neutrino oscillations and set upper limits on the mixing angles and neutrino mass differences in the transitions: ..nu../sub ..mu../ ..-->.. ..nu../sub e/, ..nu../sub tau/, and ..nu../sub e/ ..-->.. ..nu../sub e/.
Date: January 1, 1981
Creator: Baker, N.J.; Connolly, P.L. & Kahn, S.A.
Partner: UNT Libraries Government Documents Department

Preliminary results on nu/sub. mu. / + e/sup -/. -->. nu/sub. mu. / + e/sup -/

Description: We present here preliminary results on a recent experiment on nu/sub ..mu../ - e/sup -/ elastic scattering. A brief review of the Glashow-Salam-Weinberg theory is given, indicating how the measurement of the total cross section gives rise to an ambiguous solution for sin/sup 2/ THETA/sub w/, and showing how the differential cross section can be used to resolve the ambiguity. The experimental configuration and the extraction of the signal are described. The data are compared with those from our previous experiment, and relevant distributions from the combined data sample are presented. The differential cross section is examined in an attempt to resolve the ambiguity in sin/sup 2/ THETA/sub w/, the lower value of sin/sup 2/ THETA/sub w/ = 0.20 being favored.
Date: June 1, 1982
Creator: Baker, N.J.; Connolly, P.L. & Kahn, S.A.
Partner: UNT Libraries Government Documents Department

Magnetic properties of iron yoke laminations for SSC dipole magnets

Description: We examine the magnetic properties for the iron used in the SSC yoke laminations so that the accelerator tolerances can be met. The accelerator requirements for field quality specify a tolerance on the variation in the central field. At machine injection the variation in field is attributed to coercivity, H{sub c}. Requirements on the magnitude and the variation of H{sub c} are presented. At the 6.65 tesla operating field the variation in the saturation magnetization dominates the magnetic tolerance for the iron. 4 refs., 3 figs., 2 tabs.
Date: January 1, 1991
Creator: Kahn, S.A. & Morgan, G.H.
Partner: UNT Libraries Government Documents Department

Observation of a visible charmed particle decay in neutrino interactions

Description: In a sample of 250 semileptonic charmed particle decays (..nu../sub ..mu../ + Neon ..-->.. ..mu../sup -/ + e/sup +/ + ... events), one clear event is found where the e/sup +/ does not come directly from the ..nu.. interaction vertex but from a decay point 1.1 cm downstream of the vertex. This event is interpreted as a visible charmed particle decay: into an e/sup +/ and a positive and a negative charged track. The observation of a visible charm decay in the sample is consistent with what is expected if the charm lifetime were of the order 5 x 10/sup -13/ sec. 5 references.
Date: January 1, 1979
Creator: Cnops, A.M.; Connolly, P.L. & Kahn, S.A.
Partner: UNT Libraries Government Documents Department

Measurement of the nu/sub. mu. / charged-current cross section

Description: The Fermilab 15-ft bubble chamber, filled with a heavy neon-hydrogen mix, was exposed to a narrow band nu/sub ..mu../ beam. Based on the observation of 830 charged current nu/sub ..mu../ interactions, the cross section was found to rise linearly with the neutrino energy in the interval, 10 GeV less than or equal to E/sub nu/ less than or equal to 240 GeV, with a constant slope of: sigma/sub nu/E/sub nu/ = (0.64 +- 0.05) 10/sup -38/ cm/sup 2/ GeV/sup -1/. This result is discussed in relation to other experiments.
Date: January 1, 1982
Creator: Baker, N.J.; Connolly, P.L & Kahn, S.A.
Partner: UNT Libraries Government Documents Department

Recent results from neutrino interactions in heavy neon

Description: Recent results presented from a study of muon neutrinos interacting in heavy neon include dilepton production, strange particle rates, the D/sup 0/..-->..K/sup 0/..pi../sup +/..pi../sup -/ decay, the lack of observation of new particles, and the cross section for nu/sub e/ + e elastic scattering. 8 references (JFP)
Date: January 1, 1978
Creator: Cnops, A.M.; Connolly, P.L. & Kahn, S.A.
Partner: UNT Libraries Government Documents Department

Coil and iron design for SSC 50 mm magnet

Description: In this paper we present the design of the two dimensional coil and iron cross section, referred to as DSX201/W6733, for the 50 mm aperture dipole magnet being built at the Brookhaven National Laboratory for the Superconducting Super Collider (SSC). The computed values of the allowed field harmonics as a function of current, the quench performance predictions, the stored energy calculations, the effect of random errors on the coil placement and the Lorentz forces on the coil will be presented. The yoke has been optimized to reduce iron saturation effects on the field harmonics. We shall present the summary of this design which will include the expected overall performance of this cross section. 4 refs., 8 figs., 12 tabs.
Date: January 1, 1990
Creator: Gupta, R.C.; Kahn, S.A. & Morgan, G.H.
Partner: UNT Libraries Government Documents Department

SSC 50 mm dipole cross section

Description: In this paper we present the magnetic design of the two dimensional coil and iron cross section, referred to as DSX201/W6733, for the 50 mm aperture main ring dipole magnet for the Superconducting Super Collider (SSC). The computed values of the allowed field harmonics as a function of current, the quench performance predictions, the stored energy calculations, the effect of random errors on the coil placement and the Lorentz forces on the coil will be presented. The yoke has been optimized to reduce iron saturation effects on the field harmonics. We shall present the summary of this design which will include the expected overall performance of this cross section. Prototypes of these dipoles are being built at the Brookhaven National Laboratory (BNL) and at the Fermi National Accelerator Laboratory (FNAL). There are slight differences between the cross sections at the two laboratories. 7 refs., 6 figs., 11 tabs.
Date: January 1, 1991
Creator: Gupta, R.C.; Kahn, S.A. & Morgan, G.H.
Partner: UNT Libraries Government Documents Department

Monte Carlo study of inclusive W/sup +/ production at CBA

Description: The UA1 and UA2 experiments at the CERN SPS anti pp collider observed several events which they have interpreted to be the leptonic decay of the charged intermediate vector boson, W/sup +-/ + e/sup +-/nu. All of these events have an electron with large transverse momentum and large mission transverse energy. The experiments had remarkably little background in the region of large transverse momentum of the electron (P/sub Te/). In this report we examine the possibility of doing a high statistics experiment producing several million W's per year. Large statistics are necessary to obtain a precise measurement of the W/sup +/ mass and of the Z/sup 0/-W mass difference. We use the Jacobian peak in the electron P/sub T/ distribution to obtain the W/sup +/mass. We examine in detail the P/sub T/ distribution of the electron produced by the leptonic decay of the W/sup +/ ..-->.. e/sup +/nu. We investigate backgrounds to this reaction from the pileup of minimum bias events, from leading ..pi../sup 0/s in light quark jets simulating electrons and from the decay of heavy quark jets producing electrons.
Date: July 8, 1983
Creator: Kahn, S.A.; Killian, T.J.; Murtagh, M.J. & Grannis, P.
Partner: UNT Libraries Government Documents Department

A comparison of calculations and measurements of the field harmonics as a function of current in the SSC dipole magnets

Description: A large number of short and long superconducting dipole magnets for the Superconducting Super Collider (SSC) have been constructed and measured for their magnetic field properties at Brookhaven National Laboratory (BNL). In this paper we compare the calculations and measurements for the variation of field harmonics as a function of current in 40 mm aperture and 50 mm aperture dipole magnets. The primary purpose of this paper is to examine the iron saturation effects on the field harmonics. The field harmonics also change due to the persistent current in the superconducting wires and due to the deformation of the coil shape because of Lorentz forces. We discuss the variation in the sextupole harmonics (b{sub 2}) with current and explain the differences between the calculations and measurements. We also discuss the skew quadrupole harmonic at high field in the long dipole magnets. 3 refs., 3 figs., 1 tab.
Date: January 1, 1991
Creator: Gupta, R.C.; Cottingham, J.G.; Kahn, S.A.; Morgan, G.H. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Plasma Lens for Muon and Neutrino Beams

Description: The plasma lens is examined as an alternate to focusing horns and solenoids for use in a neutrino or muon beam facility. The plasma lens concept is based on a combined high-energy lens/target configuration. The current is fed at electrodes located upstream and downstream from the target where pion capturing is needed. The current flows primarily in the plasma, which has a lower resistivity than the target. A second plasma lens section, with an additional current feed, follows the target to provide shaping of the plasma for optimum focusing. The plasma lens is immersed in an additional solenoid magnetic field to facilitate the plasma stability. The geometry of the plasma is shaped to provide optimal pion capture. Simulations of this plasma lens system have shown a 25% higher neutrino production than the horn system. Plasma lenses have the additional advantage of negligible pion absorption and scattering by the lens material and reduced neutrino contamination during anti-neutrino running. Results of particle simulations using plasma lens will be presented.
Date: June 23, 2008
Creator: Kahn,S.A.; Korenev, S.; Bishai, M.; Diwan, M.; Gallardo, J.C.; Hershcovitch, A. et al.
Partner: UNT Libraries Government Documents Department

Integrating the MANX 6-D Muon Cooling Experiment with the MICE Spectrometers

Description: The MANX experiment is to demonstrate the reduction of 6D muon phase space emittance using a continuous liquid absorber to provide ionization cooling in a helical solenoid magnetic channel. The experiment involves the construction of a short two-period long helical cooling channel (HCC) to reduce the muon invariant emittance by a factor of two. The HCC would replace the current cooling section of the MICE experiment now being setup at the Rutherford Appleton Laboratory. The MANX experiment would use the existing MICE spectrometers and muon beam line. This paper shall consider the various approaches to integrate MANX into the RAL hall using the MICE spectrometers. This study shall discuss the matching schemes used to minimize losses and prevent emittance growth between the MICE spectrometers and the MANX HCC. Also the placement of additional detection planes in the matching region and the HCC to improve the resolution will be examined.
Date: May 1, 2009
Creator: Kahn, S.A.; Abrams, R.J.; Ankenbrandt, C.; Cummings, M.A.C.; Johnson, R.P.; Roberts, T. et al.
Partner: UNT Libraries Government Documents Department

Limits on likesign dilepton production in nu/sub. mu. / interactions

Description: We have searched for the production of likesign dilepton events (nu/sub ..mu../ + Ne ..-->.. ..mu../sup -/ + e/sup -/ + ...) in a wideband neutrino beam at FNAL using the 15' bubble chamber. We observe no signal above the background arising from conventional sources. We set 90% confidence level upper limits for the production rates of (nu/sub ..mu../ + Ne ..-->.. ..mu../sup -/ + e/sup -/ + ...)/(nu/sub ..mu../ + Ne ..-->.. ..mu../sup -/ + ...) less than or equal to 8 * 10/sup -5/ and (nu/sub ..mu../ + Ne ..-->.. ..mu../sup -/ + e/sup -/ + ...)/(nu/sub ..mu../ + Ne ..-->.. ..mu../sup -/ + e/sup +/ + ...) less than or equal to 6 * 10/sup -2/.
Date: May 21, 1985
Creator: Baker, N.J.; Connolly, P.L.; Kahn, S.A.; Murtagh, M.J.; Palmer, R.B.; Samios, N.P. et al.
Partner: UNT Libraries Government Documents Department

A SCENARIO FOR A BROOKHAVEN NEUTRINO SUPER BEAM EXPERIMENT.

Description: This paper examines the feasibility of a long baseline neutrino beam facility based on a proposed upgrade to the AGS accelerator at Brookhaven National Laboratory. It assumes that the AGS is upgraded initially to a 1 MW proton driver and eventually to a 4 MW proton machine. This upgrade would provide a strong incentive for a long baseline low energy neutrino beam to study neutrino oscillations. In this paper we look at a possible long baseline experiment with a detector at Cornell, which is 350 km away from BNL.
Date: July 1, 2001
Creator: DIWAN,M.V.; KAHN,S.A.; PALMER,R.B.; STUMER,I.; PARSA,Z. & MCDONALD,K.T.
Partner: UNT Libraries Government Documents Department

Iron saturation control in RHIC dipole magnets

Description: The Relativistic Heavy Ion Collider (RHIC) will require 360 dipoles of 80 mm bore. This paper discusses the field perturbations produced by the saturation of the yoke iron. Changes have been made to the yoke to reduce these perturbations, in particular, decapole < 10{sup {minus}4}. Measurements and calculations for 6 series of dipole magnets are presented. 2 refs., 2 figs., 1 tab.
Date: January 1, 1991
Creator: Thompson, P.A.; Gupta, R.C.; Kahn, S.A.; Hahn, H.; Morgan, G.H.; Wanderer, P.J. et al.
Partner: UNT Libraries Government Documents Department

Revised cross section for RHIC dipole magnets

Description: Using the experience gained in designing and building Relativistic Heavy Ion Collider (RHIC) dipole prototype magnets an improved cross section has been developed. Significant features of this design include the use of only three wedges for field shaping and wedge cross sections which are sectors of an annulus. To aid in the understanding of the actual magnets, one has been sectioned, and detailed mechanical and photographic measurements made of the wire positions. The comparison of these measurements with the magnetic field measurements will is presented. 2 refs, 3 figs., 2 tabs.
Date: January 1, 1991
Creator: Thompson, P.A.; Gupta, R.C.; Kahn, S.A.; Hahn, H.; Morgan, G.H.; Wanderer, P.J. et al.
Partner: UNT Libraries Government Documents Department

Strange particle production in neutrino-neon charged current interactions

Description: Neutral strange particle production in charged-current muon-neutrino interactions have been studied in the Fermilab 15-foot neon bubble chamber. Associated production is expected to be the major source of strange particles in charged-current neutrino interactions. sigma-neutral and xi-minus production by neutrinos was observed. The dependence on various leptonic and hadronic variables is investigated. A fit to single and associated production of s, s/anti-s, and c quarks is described based on the number of single and double strange particle production events. Inclusive neutral strange particle decays (V/sup 0/) production rates as a fraction of all charged-current events are measured and are tabulated. The lambda/K ratio is found to be 0.39 +- 0.04 and the fraction of lambda coming from sigma-neutral is (16 +- 5)%. The single- and double V/sup 0/ production was used to determine the associated s anti-s production rate and single s-quark production rate. 13 refs., 7 figs., 3 tabs. (LEW)
Date: January 1, 1986
Creator: Plano, R.; Baker, N.J.; Connolly, P.L.; Kahn, S.A.; Murtagh, M.J.; Palmer, R.B. et al.
Partner: UNT Libraries Government Documents Department

Gluino searches at the SSC

Description: We have studied the feasibility of observing the production of gluino pairs at the SSC using the proposed EMPACT detector as a model for experimental resolution. We have considered missing E{sub T} and like-sign dimuon signatures of SUSY. The signal-to-noise ratio for the missing E{sub T} signal is between 2.5:1 and 5:1 depending on the mass of the gluino. The like-sign dimuon signature displays the Majorana property of gluinos. 10 refs., 3 figs., 2 tabs.
Date: October 1, 1990
Creator: Fonseca, V. (Universidad Complutense de Madrid (Spain). Facultad de Ciencias Fisicas); Kahn, S.A.; Murtagh, M.J. & Paige, F.E. (Brookhaven National Lab., Upton, NY (USA))
Partner: UNT Libraries Government Documents Department

Observation of the kaonic decay of the. lambda. /sub c//sup +/ charmed baryon. [Rates]

Description: There were 34 events observed with visible strange particle production out of a total charged current sample of 4,500 events in a wide-band neutrino exposure of the BNL 7-foot bubble chamber filled with H/sub 2/ or D/sub 2/. Three events were uniquely identified as having single strange particle production, two with ..delta..S = -..delta..Q. In both ..delta..S = -..delta..Q events we observe the ..lambda../sub c//sup +/(2260), which in one case decays to ..lambda pi../sup +/..pi../sup +/..pi../sup -/ and in the second case to panti K/sup 0/..pi../sup -/..pi../sup +/. Production rates are given. 11 references.
Date: January 1, 1979
Creator: Cnops, A.M.; Connolly, P.L.; Kahn, S.A.; Kirk, H.G.; Murtagh, M.J.; Palmer, R.B. et al.
Partner: UNT Libraries Government Documents Department

A COMPLETE SCHEME FOR A MUON COLLIDER.

Description: A complete scheme for production, cooling, acceleration, and ring for a 1.5 TeV center of mass muon collider is presented, together with parameters for two higher energy machines. The schemes starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Six dimensional cooling in long-period helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids.
Date: September 1, 2007
Creator: PALMER,R.B.; BERG, J.S.; FERNOW, R.C.; GALLARDO, J.C.; KIRK, H.G.; ALEXAHIN, Y. et al.
Partner: UNT Libraries Government Documents Department

A COMPLETE SCHEME FOR IONIZATION COOLING FOR A MUON COLLIDER.

Description: A complete scheme for production and cooling a muon beam for three specified muon colliders is presented. Parameters for these muon colliders are given. The scheme starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Emittance exchange cooling in slow helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further slow helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids using high TC superconductor at 4 K. Preliminary simulations of each element are presented.
Date: June 25, 2007
Creator: PALMER,R.B.; BERG, J.S.; FERNOW, R.C.; GALLARDO, J.C.; KIRK, H.G.; ALEXAHIN, Y. et al.
Partner: UNT Libraries Government Documents Department

HIGH FIELD SOLENOID FOR MUON COOLING.

Description: Magnets made with high-temperature superconducting (HTS) coils operating at low temperatures have the potential to produce extremely high fields for use in accelerators and beam lines. The specific application of interest that we are proposing is to use a very high field (of the order of 50 Tesla) solenoid to provide a very small beta region for the final stages of cooling for a muon collider. With the commercial availability of HTS conductor based on BSCCO technology with high current carrying capacity at 4.2 K, very high field solenoid magnets should be possible. In this paper we will evaluate the technical issues associated with building this magnet. In particular we address how to mitigate the high Lorentz stresses associated with this high field magnet.
Date: June 26, 2006
Creator: KAHN, S.A.; ALSHARO'A, M.; HANLET, P.; JOHNSON, R.P.; KUCHNIR, M.; NEWSHAM, F. et al.
Partner: UNT Libraries Government Documents Department

Modeling the high-field section of a muon helical cooling channel

Description: This paper describes the conceptual design and parameters of a short model of a high-field helical solenoid for muon beam cooling. Structural materials choices, fabrication techniques and first test results are discussed.
Date: May 1, 2010
Creator: Zlobin, A.V.; Barzi, E.; Kashikhin, V.S.; Lamm, M.J.; Lombardo, V.; Lopes, M.L. et al.
Partner: UNT Libraries Government Documents Department

Limits on neutrino oscillations in the Fermilab narrow band beam

Description: A search for neutrino oscillations was made using the Fermilab narrow-band neutrino beam and the 15 ft. bubble chamber. No positive signal for neutrino oscillations was observed. Limits were obtained for mixing angles and neutrino mass differences for nu/sub ..mu../ ..-->.. nu/sub e/, nu/sub ..mu../ ..-->.. nu/sub tau/, nu/sub e/ ..-->.. nu/sub e/. 5 refs.
Date: January 1, 1986
Creator: Brucker, E.B.; Jacques, P.F.; Kalelkar, M.; Koller, E.L.; Plano, R.J.; Stamer, P.E. et al.
Partner: UNT Libraries Government Documents Department