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Neutron Sciences 2008 Annual Report - 17.79 MB - Spallation ...

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64<br />

FACILITY DEVELOPMENT <strong>2008</strong> ANNUAL REPORT<br />

Data Acquisition and Controls<br />

ORNL NEUTRON SCIENCES neutrons.ornl.gov<br />

The Data Acquisition and Controls<br />

Group develops and tests software and<br />

electronics to meet the unique data collection<br />

and handling requirements of<br />

the instruments at SNS and HFIR. The<br />

data-related demands at these facilities<br />

will increase dramatically during<br />

the next few years, resulting in some<br />

of the fastest data rates and highest<br />

intensities anywhere.<br />

In <strong>2008</strong>, the group maintained and<br />

improved the capabilities of four<br />

operational instruments, while<br />

providing support for the commissioning<br />

of three new ones. Each of<br />

the three new instruments has its<br />

own particular challenges:<br />

› SEQUOIA has more than<br />

40 square meters of LPSDs;<br />

› CNCS operates its detectors<br />

in an argon atmosphere;<br />

and<br />

› SNAP has the largest-<br />

area Anger camera coverage<br />

in the world.<br />

Pam Morrison (left), Detectors Group, and<br />

Tara Thompson (right), Data Acquisition<br />

and Controls.<br />

Each instrument required significant testing and<br />

validation of new state-of-the-art electronic designs.<br />

SNAP also required new software for calibration<br />

and detector setup.<br />

In addition, flat field correction algorithms developed<br />

for the SNAP Anger camera detectors were extended<br />

for use at the Liquids and Magnetism reflectometers,<br />

providing better high Q performance and demonstrating<br />

how technology design for one detector<br />

system can positively affect the performance of other<br />

systems.<br />

Simultaneous realtime<br />

views of data at<br />

the SNS Magnetism<br />

Reflectometer. Figure<br />

1a shows the function<br />

int(x,y)dy on the y axis<br />

and time of flight on<br />

the x, while Figure 1b<br />

is int(x,y,t)dt. The polarizer/analyzer<br />

state<br />

is user selectable.<br />

1a.<br />

1b.

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