Magnetic field can be controlled

magnet regulationOne other box that is ticked. The magnetic field regulation does work perfectly. We can set and control the magnetic field of the magnet from -100 mT to +100 mT with an accuracy of 5┬ÁT. A set-point is reached in about 5 seconds which is pretty good for such a big magnet.

We have manual and computer control available. Very pleased with the DEMO support on this!

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First magnet arrived today

first magnet2It is not the best picture, however we are very happy that the first magnet set arrived. The picture shows one half of this set that is just installed on the small rotation stage that sits on a translation stage that sits on a big rotation stage that sits on a big translation stage.

The design makes it possible to take of the pole shoes and mount it back or flip them in 7 minutes within an accuracy of….0,004 degrees!!!

With this very first installation we found some point that need attention but can be solved later. Next on the program is measuring the magnetic field and see if the simulations were realistic.



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first magnet alomst ready

We visited the company that is producing the magnets. The tolerance on the iron yoke in quite a challenge and need a bit more work. Hopefully we can test the first magnet end of next week…

yoke1 yoke2 yoke3

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On the 17th of March LARMOR woke up after a long shutdown. Please follow the witter for the hot news on the commissioning! Intensity is as expected, background needs a bit more work.


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Fancy guide coil stuff

imageThe new guide field profile has a winding tool to fix the copper wire, hope it will work. We will make a new prototype coil soon…


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LARMOR stakeholders meeting

On December 17th 2014 we had an important stakeholders meeting in Delft. All the partners in the proposal were present.

We started of with several presentations that give an update or start a discussion. First there was a presentation of Rob Dalgliesh that gives an impressive overview of the progress on the SANS instrument at ISIS.

After that Jeroen Plomp gave an Delft progress update.

Next was Jurrian Bakker, who is our soft matter PhD student, with the update on Delft_soft matter PhD.

The last presentation was for our newest member of the team, Fei Li, who is our hard matter PhD student, with an update on Delft_hard matter PhDFei.

After these presentation we had discussion on sample environment, Larmor Diffraction mode, new detector to combine SANS and diffraction, use of beam time and many other topics.

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Real components are coming in…

rail GALIL








At the moment components for our prototype are coming in. We are working on the alignment of the rail system that guides the magents up and down the beamline. An other team is working on electronic motion control of this movement. We have one full ISIS motion control system (thank you Steven!) to play with…great fun!!!


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Prototype guide field coil.

guide coil Following the previous post about guide field calculations, here we have a prototype of the new guide coil design. We will have special custom extruded Al profile with ITEM profile on the inside, protection plate connection on outside, room for Cu cooling tube, 3D printed corners to reduce price and have smooth wire feed-in/out.

This prototype was tested up to 10 A and 100 Watt (approx. 80 ‘C), no cooling.

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Guide the precession…

Guide field 3DGuide field - Field strength along centre






Simulations have been done for many configurations of the coils that guide the precession through the instrument. For the SESANS mode these coils need to be in a magnetic balance for the full beam cross section. This is not trivial because of all the spacial restrictions in the instrument. On the left one can see the SESANS configuration (all coils in line) with a coil for the first arm, sample position and second arm. On the right one can see the magnetic field on the central axis of the instrument. Below a colorful plot of this field for the full setup.

Guide field - Field map top view

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Magnetic field simulations together with ISIS

Plot 80 degreesPlot 20 degrees






Together with Tomas M. from ISIS we have been looking for the optimal setting of our split magnets. Depending on the encoding angle (plot 1=80 deg, plot 2=20 deg) we need a certain shift of the pole shoes. Michel T. is digging through all the simulation data to find the perfect setting. Conclusion: it will probably work fine…

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