SEQUOIA: A Newly Operating Chopper Spectrometer at the SNS

被引：217

作者：

Granroth, G. E. ^{[1
]}

Kolesnikov, A. I. ^{[1
]}

Sherline, T. E. ^{[1
]}

Clancy, J. P. ^{[2
]}

Ross, K. A. ^{[2
]}

Ruff, J. P. C. ^{[2
]}

Gaulin, B. D. ^{[2
]}

Nagler, S. E. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

[2] McMaster Univ, Dept Phys & Astron, Hamilton, ON, Canada

来源：

INTERNATIONAL CONFERENCE ON NEUTRON SCATTERING 2009 | 2010年 / 251卷

基金：

美国能源部;

关键词：

D O I：

10.1088/1742-6596/251/1/012058

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

A fine resolution chopper spectrometer (SEQUOIA) recently received first neutrons at the SNS. The commissioning phase of the instrument is underway. SEQUOIA is designed to utilize neutrons of an incident energy (E-i) between 10-2000 meV. A monochromatic beam is provided on a sample, 20 m from the decoupled ambient temperature H2O moderator, by filtering the white beam with a Fermi chopper located 18 m from the source. After interacting with the sample, neutrons are detected by an array of He-3 linear position sensitive tubes located on a vertical cylinder with a radius of 5.5 m. This contribution presents current results from the commissioning experiments and compares SEQUOIA's actual and predicted performance. These commissioning experiments include characterization of the beam by monitors, determination of the chopper phase offsets, and runs with V and C4H2I2S. The predicted performance is provided by analytical calculations and Monte Carlo simulations.

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