SEQUOIA: A newly operating chopper spectrometer at the SNS

G. E. Granroth; A. I. Kolesnikov; T. E. Sherline; J. P. Clancy; K. A. Ross; J. P.C. Ruff; B. D. Gaulin; S. E. Nagler

doi:10.1088/1742-6596/251/1/012058

SEQUOIA: A newly operating chopper spectrometer at the SNS

G. E. Granroth, A. I. Kolesnikov, T. E. Sherline, J. P. Clancy, K. A. Ross, J. P.C. Ruff, B. D. Gaulin, S. E. Nagler

Research output: Contribution to journal › Article › peer-review

221 Scopus citations

Abstract

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 ³He 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 C₄H₂I ₂S. The predicted performance is provided by analytical calculations and Monte Carlo simulations.

Original language	English
Article number	012058
Journal	Journal of Physics: Conference Series
Volume	251
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/251/1/012058
State	Published - 2010

Access to Document

10.1088/1742-6596/251/1/012058

Cite this

@article{4589e5b27876491386143d2b7ddbe7d7,

title = "SEQUOIA: A newly operating chopper spectrometer at the SNS",

abstract = "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 (Ei) 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 3He 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 C4H2I 2S. The predicted performance is provided by analytical calculations and Monte Carlo simulations.",

author = "Granroth, {G. E.} and Kolesnikov, {A. I.} and Sherline, {T. E.} and Clancy, {J. P.} and Ross, {K. A.} and Ruff, {J. P.C.} and Gaulin, {B. D.} and Nagler, {S. E.}",

year = "2010",

doi = "10.1088/1742-6596/251/1/012058",

language = "English",

volume = "251",

journal = "Journal of Physics: Conference Series",

issn = "1742-6588",

number = "1",

}

TY - JOUR

T1 - SEQUOIA

T2 - A newly operating chopper spectrometer at the SNS

AU - Granroth, G. E.

AU - Kolesnikov, A. I.

AU - Sherline, T. E.

AU - Clancy, J. P.

AU - Ross, K. A.

AU - Ruff, J. P.C.

AU - Gaulin, B. D.

AU - Nagler, S. E.

PY - 2010

Y1 - 2010

N2 - 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 (Ei) 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 3He 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 C4H2I 2S. The predicted performance is provided by analytical calculations and Monte Carlo simulations.

AB - 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 (Ei) 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 3He 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 C4H2I 2S. The predicted performance is provided by analytical calculations and Monte Carlo simulations.

UR - http://www.scopus.com/inward/record.url?scp=79952846807&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/251/1/012058

DO - 10.1088/1742-6596/251/1/012058

M3 - Article

AN - SCOPUS:79952846807

SN - 1742-6588

VL - 251

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - 1

M1 - 012058

ER -

SEQUOIA: A newly operating chopper spectrometer at the SNS

Abstract

Access to Document

Other files and links

Fingerprint

Cite this