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D11 - Lowest momentum transfer & lowest background small-angle neutron scattering instrument

D11 is the archetype of a long, pinhole geometry instrument for small-angle neutron scattering (SANS), designed for the study of large scale structures in chemistry, biology and solid state physics.

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News

26/03/09

Welcome to the first users!

The D11 team gives a warm welcome to the first users on Thursday 26 March 2009, after the 15 months shutdown and successful project completion.


Front row, from left: Nicolas Jouault, Chloé Chevigny, Jacques Jestin (LLB Paris)

12/03/09

First measurements with the new D11 detector

Copyright: ILL/Artechnique

The figure below is a standard Silver-behenate sample, measured today under maximum flux conditions at D11 with its new 3He detector at a countrate of ca. 970 000 c/s!   




The detector dead-time is still to be determined quantitatively but the quality of this raw data image – given the high countrate - is excellent, and the image is stable. It proves that the new detector electronics can indeed digest very high countrates without parasites (seen on the old detector beyond 100 000 c/s).

It seems that we got with the detector refurbishment also ahead of the project specifications (300 000 c/s), as with the collimation guide renewal.

Congratulations and thanks to the ILL detector group !

For the D11 team

Peter Lindner

27/11/08

D11 ready for commissioning

Following a nearly complete refurbishment, including installation of a new detector on a new trolley inside a new larger and longer Aluminium vacuum tank as well as a replacement of 39 metres uncoated glass neutron guides on the collimation side, this worldwide unique 80 m SANS instrument appears now reborn (the ASTRIUM velocity remains the only major component which has not been changed during the 11 months shutdown).

According to first tests performed in September, the instrument is performing better than estimated after the innovative guide design change. We expect that the instrument performance will be further enhanced by the new considerably larger detector (before its electronic upgrade used by D22), with a gain in dynamic range of a factor of 2.

March 2008: Delivery and installation of the new detector tank

 

The project team accepts consignment of the first element  of the new detector tank, delivered on 11 March 2008 to ILL.

The D11 task force (from left: P. Lindner, A. Perillo-Marcone, R. Schweins, D. Bowyer, C. Amrouni)

C. Gillart enters one of the new 7m long tank elements into the guide hall (12 March 2008)

Tank delivery outside the Guide Hall (video)

Tank delivery inside the Guide Hall (video)

 

The D11 project team gratefully acknowledges the work of everybody involved  (SMAE, subcontractors).
The preparation and execution of this delicate operation was on schedule and conducted with great professionalism.


P. Lindner

February 2008: Preparation of the new 2.10m wide Aluminium detector tank.

 

The dynamic range of D11 will be drastically increased with the new, faster 3He detector (sensitive area 1m x 1m and spatial resolution 0.75 x 0.75 cm).

The new support trolley for the 1m x 1m D11 detector inside the new D11 tank.

D11 trolley test (video)

 

January 2008: The tank dismantling

 

After 23 years of loyal and faithful service, the 40 meter-long steel detector tank of the instrument D11 was totally dismantled and removed from the ILL guide hall by being lifted out through the roof (17 January 2008). 

D11 tank dismantling (movie)

 

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