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Building MACS *

Building MACS *. Collin Broholm Johns Hopkins University and NIST Center for Neutron Research. Goals of the MACS project Status of the design Engineering resources for MACS. * Project Supported by the National Science Foundation. Scientific program for MACS.

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Building MACS *

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  1. Building MACS* Collin Broholm Johns Hopkins University and NIST Center for Neutron Research • Goals of the MACS project • Status of the design • Engineering resources for MACS * Project Supported by the National Science Foundation

  2. Scientific program for MACS • Dynamic correlations in nano-scale magnets • Magnetic order in organic metals • Quantum phase transitions versus pressure • Mixed phases in quantum spin systems • Spin and charge polarons in oxides • Weak broken symmetry phases

  3. Technical Goals for MACS project • Maximize instrumental efficiency • Worlds most intense monochromatic cold neutron beam • Maximize solid angle and efficiency of detection system • Taylor energy band probed to scientific problem • Minimize instrumental background • From fast neutrons • From non-sample scattering • User-Friendly instrument • Reliable functional hardware • Streamline experimental process • Reliable software for planning, execution, and analysis

  4. NCNR Liquid Hydrogen cold source MACS Beam New cold source to be installed in 2002 will double flux

  5. Overview of MACS Cryogenic filters: PG, Be, and BeO Variable beam aperture and monitor Sample positioning system focusing super-mirror guide Cooled filters: PG, sapphire, Be Four Radial Collimators to change E-resolution Variable incident beam aperture to change Q-resolution Doubly focusing monochromator Multi-channel monochromatic detection system Design by C. Brocker, C. Wrenn, and M. Murbach

  6. Monte Carlo Simulation of MACS Y. Qiu and C. Broholm to be published (2002)

  7. Timeline for MACS - resources • 1993 Discussions about the possibility of a “sub-thermal” TAS on NG0 • 1994 Analytical calculations show efficacy of double focusing at NG0 • Initiate JHU/NIST project to develop conceptual design • 1998 Top level specification for monochromator completed • JHU/NIST project starts to develop Monochromator • 2000 Christoph Brocker starts engineering design • NIST-NSF-JHU agreement to fund MACS • 2001 JHU Instrument development group involved • 2002 Assistant engineer on board to help Christoph Brocker • 2004 MACS Post doctoral fellow to start • 2005 July: MACS complete and assembled at NIST • 2006 January: MACS User program starts • 2006 August: MACS project complete

  8. January 2002 Status of MACS Top level specification completed Joe Orndorff of JHU IDG completed Phase A study Conceptual design completed, Rober Barkhauser of JHU IDG working on Phase A study Completed Conceptual design completed. Gregg Scharfstein of JHU IDG working on Phase A study of double analyzer mechanism NCNR design available Euro-collimators working on design of collimators Tom Reeves of JHU IDG working on Phase A study Design by C. Brocker, C. Wrenn, and M. Murbach

  9. 1428 cm2 MACS monochromator Electronic rack

  10. MACS monochromator passes optical test defocused focused Blade 4 Remaining 20 blades

  11. Multiplexing crystal analyzer system Design by C. Brocker

  12. One of twenty channels “TAS” detector Collimator 1 Energy integrating Detector 8o vertically focusing Analyzer crystals BeO filter Be filter PG filter Design by C. Brocker Collimator 2

  13. Conceptual design for cryogenic filters Neutron absorbing spacers 8” BeO 4” Be 2” PG

  14. Conceptual design for cryogenic filters

  15. Key personnel building MACS Collin Broholm JHU PI Jeff Lynn NCNR Co-PI Paul Brand NCNR Engineering manager Christoph Brocker NCNR Lead M-engineer Interviewing JHU MACS M-Engineer Joe Orndorff JHU Assisting E-engineer Gregg Scharfstein JHU Assisting M-engineer Tom Reeves JHU Assisting E-engineer Robert Barkhauser JHU Assisting E-engineer Yiming Qiu JHU Graduate Assistant Undergraduates JHU U. G. Assistants

  16. Summary • MACS will be a unique resource for probing dynamic correlations in condensed matter for • Can optimize range of energy transfer for experiment • Independent variation of Q and E resolution • Top level specifications have been established • Crucial monochromator successfully completed • Other important components are in conceptual design phase • Key personnel in place or being interviewed • On target for scientific commissioning 2005-6 and project completion in Fall 2006.

  17. MACS Funding

  18. Spending profile by category

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