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Building MACS. Goals of the MACS project Funding and time line Technical overview Possible IDG contributions Process for IDG involvement in MACS. MACS: A versatile probe of dynamic processes in condensed matter. Maximize instrumental efficiency

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Building macs
Building MACS

  • Goals of the MACS project

  • Funding and time line

  • Technical overview

  • Possible IDG contributions

  • Process for IDG involvement in MACS

Macs a versatile probe of dynamic processes in condensed matter
MACS: A versatile probe of dynamic processes in condensed matter

  • 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 hardware

    • Streamline experimental process

    • Reliable software for planning, execution, and analysis

Macs timeline
MACS Timeline matter

  • 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 MACS double focusing monochromator completed

  • 2001 MPP in place for entire project

  • 2001 Assistant engineer on board to help Christoph Brocker

  • 2002 Detector system prototype testing

  • 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

Macs funding
MACS Funding matter

Ncnr liquid hydrogen cold source
NCNR Liquid Hydrogen cold source matter


New cold source to be installed in 2001 will double flux

Overview of macs
Overview of MACS matter

Design by C. Brocker, C. Wrenn, and M. Murbach

Monte carlo simulation of macs
Monte Carlo Simulation of MACS matter

Y. Qiu and C. Broholm to be published (2000)

Multiplexing crystal analyzer system
Multiplexing crystal analyzer system matter

Design by C. Brocker

One of twenty channels
One of twenty channels matter

“TAS” detector

Collimator 1

Energy integrating


8o vertically focusing

Analyzer crystals

BeO filter

Be filter

PG filter

Design by C. Brocker

Collimator 2

Considerations for idg involvement
Considerations for IDG involvement matter

  • Match to IDG expertise

  • Match to resources available

  • Simple and well defined and interfaces

  • Similarities to monochromator project:

    • Top level documentation

    • Collaboration with Brand, Brocker, and Broholm

    • Testing and documentation

  • Different from monochromator project:

    • Funding in place

    • Mostly direct payments from NSF grant

Possible idg tasks
Possible IDG tasks matter

  • Cryogenic filter assembly for incident beam

  • Cryogenic filter assembly for detector system

  • Monochromator translation stage

  • Collimator exchanger for detection system

  • Double crystal spectrometer system

  • Neutron beam imaging system

  • Attenuator exchange system

  • Beam line slits

  • Entire detection system

  • Instrument control Software development

Process for idg involvement
Process for IDG involvement matter

  • IDG learns about possible sub projects

  • IDG selects likely project(s)

  • Brocker, Broholm, and Brand develop top level specification

  • IDG presents good faith estimate of time and price

  • Broholm approves proposal in consultation with NIST

  • IDG designs builds and tests with monthly technical and financial status reporting.

  • Monthly payment from JHU account

  • Demonstrate hardware, documentation, and test results at JHU

  • Ship equipment to NIST

  • Consult during installation process