October, 2001 Hybrid Spectrometer for Single Crystal Studies at the Pulsed SNS: an update. n Principal features of the proposed hybrid spectrometer. n.

Slides:



Advertisements
Similar presentations
NDVCS measurement with BoNuS RTPC M. Osipenko December 2, 2009, CLAS12 Central Detector Collaboration meeting.
Advertisements

Stefan Roesler SC-RP/CERN on behalf of the CERN-SLAC RP Collaboration
Advanced GAmma Tracking Array
Focusing monochromators/analyzers Asymmetric diffraction geometry of the monochromator Dispersive double crystal monochromator Two wavelength sandwich.
GEANT4 Simulations of TIGRESS
Spectral Resolution and Spectrometers
Spectral Resolution and Spectrometers A Brief Guide to Understanding and Obtaining the Proper Resolution of the 785 Raman System.
Upcoming Review of the Hall D Photon Beam and Tagger Richard Jones, University of Connecticut, for the GlueX collaboration GlueX Collaboration Meeting.
Date Instrument Systems ORNL SEQUOIA Overview Garrett Granroth (Instrument Scientist) David Vandergriff (Lead Engineer) ARCS/SEQUOIA IDT meeting March.
Hardware Progress Doug Abernathy ARCS Instrument Scientist ARCS IDT Meeting Lujan Center, LANL September 30, 2002 SNS Instrument SystemsArgonne/Oak Ridge.
1 KEK Beam Test Analysis Hideyuki Sakamoto 15 th MICE Collaboration Meeting 10 st June,2006.
MUON FLUX MEASUREMENTS AT THE LSC JRA1-N2 Meeting, Zaragoza, Nov 23 rd 2007 Héctor Gómez Maluenda, University of Zaragoza.
Photon Source and Tagger Richard Jones, University of Connecticut GlueX Detector ReviewOctober 20-22, 2004, Newport News presented by GlueX Tagged Beam.
HYSPEC Hybrid Spectrometer Instrument Development Team April, 2002 A High Performance Hybrid Spectrometer for the Single Crystal Studies at the Pulsed.
Polarized Beams Using He-3 at the NCNR Triple-Axis Spectrometers Ross Erwin Tom Gentile Wangchun Chen Sarah McKenney.
HPS Test Run Setup Takashi Maruyama SLAC Heavy Photon Search Collaboration Meeting Thomas Jefferson National Accelerator Facility, May 26-27,
Progress on the New High Intensity Cold Neutron Spectrometer, MACS C. Broholm 1,2, T. D. Pike 1,2, P. K. Hundertmark 1,2, P. C. Brand 2, J. W. Lynn 2,
1 Overview of the NPDGamma Experiment at the Fundamental Neutron Physics Beamline Geoff Greene UT/ORNL.
The PEPPo e - & e + polarization measurements E. Fanchini On behalf of the PEPPo collaboration POSIPOL 2012 Zeuthen 4-6 September E. Fanchini -Posipol.
Instrument Development Test Station at HFIR CG1 Lowell Crow, May 15, 2009.
Status of the Beamline Simulation A.Somov Jefferson Lab Collaboration Meeting, May 11, 2010.
SHMS Optics and Background Studies Tanja Horn Hall C Summer Meeting 5 August 2008.
HYSPEC HYSPEC INSTRUMENT DESIGN – OUTLINE  The two “models” considered for HYSPEC – inside & outside (Mark)  A breakdown of the components of the two.
Proposal for a High Intensity Chopper Spectrometer at LANSCE Science requiring high sensitivity neutron spectroscopy Limitations of current instrumentation.
MACS –a New High Intensity Cold Neutron Spectrometer at NIST February 17, 2003Timothy D. Pike1 Developing MACS A Third Generation Cold Neutron Spectrometer.
Simulations of the double funnel construction for LET. Comparison with a single funnel The aim was to optimise the double funnel configuration to give.
EAS Reconstruction with Cerenkov Photons Shower Simulation Reconstruction Algorithm Toy MC Study Two Detector Configuration Summary M.Z. Wang and C.C.
Building MACS  Goals of the MACS project  Funding and time line  Technical overview  Possible IDG contributions  Process for IDG involvement in MACS.
HYSPEC 1 Instrument design, shielding/background simulations for Hyspec Vinita J. Ghosh.
Managed by UT-Battelle for the Department of Energy Polarized 3 He Filling Stations Xin Tong (Tony) Instrument Development Group Neutron Facilities Development.
HYSPEC IDT HYSPEC - Hybrid Spectrometer for the Single Crystal and Polarized Neutron Studies at the SNS Steve Shapiro and Igor Zaliznyak Center for Neutron.
The HYSPEC Polarized Beam Spectrometer Barry Winn, Mark Hagen, Mark Lumsden, Melissa Graves-Brook David Anderson, Xin Tony Tong B2.5, rm G, 3:15-3:30 PM.
Projected performance of NPDGamma and new systematics introduced by SM polarizer Christopher Crawford University of Kentucky NPDGamma Collaboration Meeting.
MACS Concept and Project Status Making best use of CW source MACS-imizing incident flux MACS-imizing detection efficiency From concept to reality Collin.
HYSPEC HYSPEC: A High Performance Polarized Beam Hybrid Spectrometer at the SNS Beamline 14B I.Zaliznyak 1, S. Shapiro 1, L. Passell 1, V. Ghosh 1, W.
David Winogradoff Haverford College NCNR, NIST Ivan Schroder
Status of JRA6 - MCNSI Kim Lefmann NMI3, ISIS, 28/9-05.
Neutron Flux Measurement at the CYRIC T. Horiguchi and A. Ishikawa (Tohoku University) For the FPCCD group.
HYSPEC IDT Polarized Beam Operation of the Hybrid Spectrometer at the pulsed Spallation Neutron Source. Outline HYSPEC: project timeline and place in the.
Nov Beam Catcher in KOPIO (H. Mikata Kaon mini worksyop1 Beam Catcher in the KOPIO experiment Hideki Morii (Kyoto Univ.) for the KOPIO.
MACS –a New High Intensity Cold Neutron Spectrometer at NIST September 24, 2002Collin L. Broholm Timothy D. Pike 1 Scientific Program and Requirements.
Photon Source and Tagger Richard Jones, University of Connecticut GlueX Detector ReviewOctober 20-22, 2004, Newport News presented by GlueX Tagged Beam.
Conceptual design and performance of high throughput cold spectrometer : MACS Why MACS Layout and key elements Performance Data collection Scientific program.
Past and Future Insights from Neutron Scattering Collin Broholm * Johns Hopkins University and NIST Center for Neutron Research  Virtues and Limitations.
Neutron Scattering Group February, 2001 A High Performance Instrument for the Single Crystal Spectroscopy at the Pulsed SNS. n What is the spectrometer.
MCNSI meeting, February 2006 Contents: People –V. Ryukhtin left for part time only Multichannel focusing benders – continuation –resolution functions.
NMI3 meeting, ISIS, September 26-29, 2005 Contents: Overview of new capabilities of the RESTRAX software Numerical optimizations of TAS parameters Virtual.
00 Cooler CSB Direct or Extra Photons in d+d  0 Andrew Bacher for the CSB Cooler Collaboration ECT Trento, June 2005.
A New High Intensity Cold Neutron Spectrometer at NIST J. A. Rodriguez 1,3, P. Brand 3, C. Broholm 2,3, J.C. Cook 3, Z. Huang 3, P. Hundertmark 3, J. Lynn.
CAPABILITIES Desire to measure lattice and spin dynamics in small single crystals:  Need high flux at sample position.  Low background Science Needs:
RICH Simulation in LHCb LHC Detector Simulation Workshop S.Easo, RAL, On behalf of LHCb–RICH group.
HYSPEC IDT Polarized Beam Mode for the Hybrid Spectrometer (HYSPEC) at the Spallation Neutron Source. Outline BNL’s HYSPEC project and its place in the.
HYSPEC IDT Introduction to HYSPEC: Overview of the Conceptual Design and Top Level Specifications. Outline Overview of the HYSPEC layout and principal.
Neutron Scattering Group March, 2001 A High Performance Hybrid Spectrometer for the Single Crystal Spectroscopy at the Pulsed SNS  Scientific case and.
HYSPEC IDT Options for polarization analysis with 3 He for the Hybrid Spectrometer (HYSPEC) L. Passell, V.J. Ghosh, I. Zaliznyak, S. Shapiro, W. Leonhardt,
HYSPEC IDT HYSPEC: Our Instrument at the Spallation Neutron Source. Outline Spallation Neutron Source (SNS) and the BNL Overview of the SNS instrument.
Moving the NPDGamma Experiment to the SNS FnPB Christopher Crawford University of Kentucky overview of NPDGamma transition to the SNS expected.
HYSPEC IDT Polarized Beam Mode for the Hybrid Spectrometer (HYSPEC) at the Spallation Neutron Source. Outline Polarization analysis and the HYSPEC place.
Beam on Target Diagnostics Beam on Target Meeting 2013 March Tom Shea.
Present status of production target and Room design Takashi Hashimoto, IBS/RISP 2015, February.
Werner Schweika, Nicolo Violini, Earl Babcock Michael Meissner Andreas Houben, Philipp Jacobs Gunnar Svennson, Xiaodong Zou, Niklas Hedin, Mats Johnsson,
Stopped K beam at J-PARC Designed by J.Doornbos 1)Optics design of a K0.8 branch 2)Performance 3)Pion contamination 4)Comments on K1.1 Nov. 4, 2005 Korea.
New optics for X’Pert PRO
of secondary light ion beams
of secondary light ion beams
The NPDGamma Experiment at the SNS FnPB
MIRACLES budget: Summary of the 3 configurations
Monte Carlo simulations for the ODIN shielding at ESS
Scope Setting Meeting MIRACLES
CLIC luminosity monitoring/re-tuning using beamstrahlung ?
Presentation transcript:

October, 2001 Hybrid Spectrometer for Single Crystal Studies at the Pulsed SNS: an update. n Principal features of the proposed hybrid spectrometer. n General schematics and tentative placement. n Secondary spectrometer and its operation in the polarized beam mode. n Main features and layout of the primary spectrometer. n Comparison with conventional TOF scheme: some Monte Carlo results. n Current questions and future plans. Igor Zaliznyak Outline Neutron Scattering Group

Principal features of the proposed hybrid spectrometer. High flux on sample at E i = meV: tall neutron guide + efficient vertical focusing by curved crystal monochromator. Polarized beam option: polarized incident neutron beam for E i = meV, polarization analysis of the scattered beam for E f < 15 meV. Low background even with bulky sample environments: collimator(s)+slit(s) define scattering volume seen by detector(s) and restrict analyzer acceptance to scattering from sample only. Scattering from cryogenic environment, magnet, pressure cell, etc., is rejected. Continuous wavevector coverage: no “blind spots” caused by spaces in the detector array. Flexibility: both energy and wavevector resolutions are variable and easily adjustable, typical resolutions are 1% to 5%. In addition, different crystal reflections may be user on monochromator. Bonus: monochromator shapes resolution function, cutting ugly high-E tail.

Neutron Scattering Group Current schematics of the instrument layout. Monochromator shielding + beam stop Guide and analyzer shieldings Important but not shown: Tentative placement: beamline 14.

Neutron Scattering Group Secondary spectrometer (TOF analyzer) and its operation in the polarized beam mode. E i =5-60 meV incident polarized beam is produced by reflection from VF Heusler crystal monochromator Set of 5-10 bender- type polarizers provide for the polarization analysis for E f <15 meV. All scattering angles of interest in the polarized mode are filled in by appropriately moving the detector bank! Scattering from the BULKY SAMPLE ENVIRONMENT (aluminium, etc.) is outside analyzer acceptance.

Neutron Scattering Group Schematics of the proposed primary spectrometer.

Neutron Scattering Group One of the possibilities for T 2 chopper: counter-rotating “drum” pair. Light and compact. No gyroscopic forces from horizontal displacement. No restriction on beam height. Fast to speed up, slow down, re-phase, similar to modern Fermi choppers. Advantages: Problems: High rotation rate, up to 900 Hz is necessary for 50  s pulse. Nested vertical magnetic bearings. The closer is T 2 chopper to the sample, the better is analyzer resolution. Question: could we put it after the monochromator?

Neutron Scattering Group Comparative layout of the vertically focused crystal and conventional disk-chopper TOF primary spectrometers. The side view of the guide cross-section is shown schematically.

Neutron Scattering Group Summary of setups used in MC simulation comparing the hybrid and “straight through” primary spectrometers. Setups with very similar layouts, both optimized for E i = E f =15 meV.

Neutron Scattering Group Neutron intensity for 2 cm tall sample obtained from MC simulation using NISP package. Focusing monochromator yields a gain of factor 2 or more for E i >15meV! NISP algorithm seems to under- estimate gain from focusing => actual gain may be even bigger! Decrease in intensity for hybrid spectrometer at E i <10 meV is due to the improved energy resolution.

Neutron Scattering Group Hybrid spectrometer: where the gain comes from? Taller guide! * Although it nicely illustrates the trend, this preliminary calculation contained an error, which underestimated the total intensity for the hybrid model.

Neutron Scattering Group Hybrid spectrometer: some more MC results. Spectral distribution of neutrons incident on the sample * Although it nicely illustrates the trend, this preliminary calculation contained an error, which underestimated the total intensity for the hybrid model. Time profile of the neutron pulse on the sample

Neutron Scattering Group Hybrid spectrometer: vertical beam compression. Guide is tall (15 cm), but sample is not (2 cm). * Although it nicely illustrates the trend, this preliminary calculation contained an error, which underestimated the total intensity for the hybrid model.

Neutron Scattering Group * Although it nicely illustrates the trend, this preliminary calculation contained an error, which underestimated the total intensity for the hybrid model. Comparison between the hybrid and “straight-through” primary spectrometers: some figures.

Neutron Scattering Group Punchline: current questions and future plans. Questions Placement: beamline 14? Is there enough floor space for the instrument large footprint? Main beam stop: can it be incorporated in the monochromator shielding? How significant background source would it be? Beamline shielding: how thick is enough and what restrictions result? T 2 chopper: can it be mobile and placed after the monochromator? Plans Workshop on the proposed Hybrid Spectrometer at BNL, October Assemble Instrument Development Team and submit formal Letter of Intent to the SNS. Find answers to the above questions. Put together a comprehensive proposal and search for funding.