The Nu-SNS proposal - ORNL Physics Division - Oak Ridge ...

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2.3 ν-SNS Facility Overview A location in the SNS target hall (see Figures 2.5 and 2.6) has been identified that is well suited for measurements of neutrino-nucleus cross sections and which does not interfere with SNS operations. Minimizing the distance to the SNS target is crucial to reduce the required detector mass and cost. The location we have identified is only ~20 m from the SNS target, as close as possible to the target given the constraints imposed by planned beamlines and shielding in the target hall. A letter-of-intent was submitted to the SNS management to use this location for a facility for neutrino measurements and was favorably reviewed (see Appendix 3). An area 4.5 × 4.5 m 2 (with a clear height of 6.5m) is currently being reserved for the ν-SNS facility. Spallation Target 17 - High Resolution Chopper Spectrometer Commission 2008 18 - Wide Angle Chopper Spectrometer Commission 2007 Incoming proton beam ν-SNS Figure 2.5 ν-SNS location in the SNS target hall. ν-SNS Proposal 10 8/4/2005
Proton Beamline ν-SNS Beamline 18 Neutron Scattering Instrument Figure 2.6 Close-up of the ν-SNS location in the SNS target hall (red area). This 4.5 × 4.5 × 6.5 m 3 volume is 20 meters from the target at an angle of 165 o relative to the incoming proton beam. The instrument and beam dump for the neighboring neutron scattering beamline are also shown. While the SNS pulse structure substantially reduces background rates, passive shielding and an efficient active veto are also required to reduce background rates to an acceptable level. Integrating over only the time windows of peak neutrino flux, an effective cosmic-ray muon (neutron) flux through the detector volume of 1.5×10 5 (3000) per day is still expected. In addition, in spite of heavy shielding around the spallation target, incoming beamline and nearby neutron scattering instruments, ~10 9 SNS neutrons pass through the detector volume each day. Passive shielding is critical for reducing the backgrounds due to neutrons from cosmic rays and from the SNS target. We propose to construct a steel enclosure surrounding the neutrino instruments. A ceiling consisting of 1 m thick steel is required in order to reduce the cosmic-ray neutron flux by a factor of 100, putting it on the same level as the neutron flux that will be created from cosmic-ray muon interactions in the shielding. It is desirable to use as much shielding as possible for the walls in order to suppress beam-induced background sources. However, the total shielding is essentially limited by the maximum floor loading allowed at the ν-SNS location. An analysis by SNS target building engineers indicates that a mass of about 550 tons is allowed at the ν-SNS location. This is sufficient to hold a steel enclosure (4.5 × 4.5 × 6.5 m 3 ) with a 1 m thick ceiling and 0.5 m thick sides (~490 tons) plus a cosmic-ray veto system and two ten-ton fiducial mass neutrino targets/detectors (mass dominated by the target material). Monte Carlo simulations of neutron production and transport from SNS proton beam loses, from the mercury target, and from the closest neutron scattering beamlines (BL17/18) are being ν-SNS Proposal 11 8/4/2005
Page 1: ν ν
Page 5 and 6: TABLE OF CONTENTS LIST OF FIGURES .
Page 7 and 8: APPENDIX 1 ν-SNS INSTRUMENT DEVELO
Page 9 and 10: LIST OF FIGURES Figure Page 2.1 Dia
Page 11 and 12: 4.44 Block diagram of the ν-SNS fr
Page 13 and 14: LIST OF TABLES Table Page 1.1 Insti
Page 15 and 16: ACRONYM LIST ADC - Analog to Digita
Page 17 and 18: 1 EXECUTIVE SUMMARY Measurements du
Page 19 and 20: Our present cost estimate for the s
Page 21 and 22: 2 PROJECT OVERVIEW 2.1 Scientific M
Page 23 and 24: the detailed structure of the induc
Page 25: Figure 2.3 Time and energy distribu
Page 29 and 30: detectors. Simultaneous operation a
Page 31 and 32: 3500 3000 2500 Escalated TPC (in as
Page 33 and 34: 3 SCIENTIFIC MOTIVATION There are m
Page 35 and 36: The neutrino energy deposition behi
Page 37 and 38: Figure 3.2 Energy scales and compos
Page 39 and 40: (LMS) calculated electron capture r
Page 41 and 42: Figure 3.5 Comparison of the core v
Page 43 and 44: composition and spatial distributio
Page 45 and 46: supernova is initiated [62]. Other
Page 47 and 48: In addition, the appearance of back
Page 49 and 50: differential cross sections can pro
Page 51 and 52: Another example of the impact that
Page 53 and 54: sensitivity achieved by ν−SNS fo
Page 55 and 56: References for Section 3: 1. “Con
Page 57 and 58: 60. W.C. Haxton, Neutrinos In Physi
Page 59 and 60: 4 PROJECT DESCRIPTION The Spallatio
Page 61 and 62: 4.1.1 Neutrons Escaping from the Sp
Page 63 and 64: Flux (in n/cm 2 /s) Figure 4.3 Back
Page 65 and 66: Concrete plug High-density concrete
Page 67 and 68: Vertical Distance from Beam (cm) Ho
Page 69 and 70: 4.1.5 Cosmic Ray Backgrounds The co
Page 71 and 72: • All backgrounds by utilizing pa
Page 73 and 74: eamline will be removable, with the
Page 75 and 76: Table 4.1 Cost breakdown for the sh
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4.3.3 Simulated Performance In orde
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(0.005%). Using current neutron flu
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Figure 4.15 Conceptual design of on
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Table 4.2 Cost breakdown for the co
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4.4 Segmented Detector 4.4.1 Requir
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Counts (arbitrarily normalized ) Fi
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As expected, thinner targets allow
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Counts (arbitrary normalization) Ne
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Counts (normalized for one year ful
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Counts (normalized for one year ful
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In conclusion, Monte Carlo studies
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Sense wires are held at high voltag
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Table 4.5 Cost breakdown for the se
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4.5 Homogeneous Detector 4.5.1 Requ
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A candidate for the PMTs to be used
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from control samples recorded durin
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The visible light signal recorded i
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Figure 4.43 Relative PMT light coll
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Table 4.6 Cost breakdown for the ho
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4.6 Common Data Acquisition System
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Table 4.7 Cost breakdown for the co
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Section 4 References: 1. MCNPX Team
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5 COST AND SCHEDULE 5.1 Work Breakd
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Example: Machining Bunker Steel Pla
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Table 5.4 Proposed ν-SNS budget pr
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6 MANAGEMENT PLAN AND PROJECT CONTR
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We respond to these special charact
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6.5 Quality Assurance and Control T
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see Appendix 5 for details. The lar
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APPENDIX 1 ν-SNS INSTRUMENT DEVELO
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APPENDIX 2 CURRICULUM VITAE OF ν-S
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Professional Vitae Summary Fred E.
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JEFF C. BLACKMON Physics Division,
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Vince Cianciolo Physics Division, O
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Biographical Sketch YURI EFREMENKO
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Curriculum Vitae TONY A. GABRIEL Ex
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• Past Member, Organizing Committ
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Dr. rer. nat. Uwe Greife, Associate
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Physics Division Oak Ridge National
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Biographical Sketch Gail C. McLaugh
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ION STANCU Department of Physics an
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21. D.V. Ahluwalia, Y. Liu and I. S
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APPENDIX 3 SNS REVIEW RESULTS In Su
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ν-SNS Proposal A-29 8/4/2005
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poorly known neutrino-nucleus cross
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APPENDIX 4 SNS TARGET HALL FLOOR LO
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APPENDIX 5 ν-SNS R&D PROGRAM Detec
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Segmented Detector Mechanics The se
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