scholarly journals The new cold neutron chopper spectrometer at the Spallation Neutron Source: Design and performance

2011 ◽  
Vol 82 (8) ◽  
pp. 085108 ◽  
Author(s):  
G. Ehlers ◽  
A. A. Podlesnyak ◽  
J. L. Niedziela ◽  
E. B. Iverson ◽  
P. E. Sokol
Keyword(s):  
Neutron Source ◽  
Cold Neutron ◽  
Spallation Neutron Source ◽  
And Performance

scholarly journals Cryogenic design for a high intensity ultracold neutron source at TRIUMF

2019 ◽  
Vol 219 ◽  
pp. 10001
Author(s):  
Shinsuke Kawasaki ◽  
Takahiro Okamura ◽  
Keyword(s):  
Heat Transport ◽  
Neutron Source ◽  
Superfluid Helium ◽  
High Intensity ◽  
Cold Neutron ◽  
Spallation Neutron Source ◽  
Cold Neutrons ◽  
Kapitza Conductance ◽  
Neutron Converter ◽  
Ultra Cold Neutron

The TUCAN (TRIUMF Ultra-Cold Advanced Neutron) collaboration has been developing a source of high-intensity ultra-cold neutrons for use in a neutron electric dipole search. The source is composed of a spallation neutron source and a superfluid helium ultra-cold neutron converter, surrounded by a cold moderator. The temperature of the superfluid helium needs to be maintained at approximately 1.0 K to suppress up-scattering by phonons. The Kapitza conductance and the heat transport by the superfluid helium are key parameters which need to be well characterized. We have therefore investigated them in first experiments. Current efforts are directed at optimizing the design of the helium cryostat.

Design challenges and performance of nested neutron mirrors for microfocusing on SNAP

2009 ◽  
Vol 42 (6) ◽  
pp. 1004-1008 ◽  
Author(s):  
Gene E. Ice ◽  
Judy W. L. Pang ◽  
Chris Tulk ◽  
Jamie Molaison ◽  
Jae-Young Choi ◽  
...  
Keyword(s):  
Neutron Source ◽  
Spallation Neutron Source ◽  
Oak Ridge ◽  
Early Results ◽  
Good Figure ◽  
Theoretical Predictions ◽  
And Performance ◽  
Spallation Neutrons ◽  
Design Challenges

Kirkpatrick–Baez (KB) neutron supermirrors can efficiently focus polychromatic neutron beams to micrometre dimensions. The ultimate size is determined mainly by the perfection of the mirrors and by the size of the beam needed to have sufficient experimental signal. Nested or Montel KB mirrors can collect ∼2.6 times more beam than standard sequential KB optics, but require good figure perfection at the edge of one mirror. This paper describes the characterization of the figure errors over the important reflective portions of the two mirrors needed for a Montel focusing pair. The measurements are placed in context with theoretical predictions and are used to predict mirror focusing performance. Strategies to improve on the focusing of this class of optics are suggested and early results from these mirrors installed on the Spallation Neutrons at Pressure (SNAP) Beamline 3 at the Spallation Neutron Source (SNS) at Oak Ridge are presented.

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