After our successful SEMSANS experiment at ISIS, we have moved everything back to Delft. Currently the instrument is being build up again so we can complete it for the final installation. Also other components like the V-coils, field steppers, guide field coils, etc. are in production. The part that is currently less visible but certainly not of less importance is the software for the motion control. There is good progress in making these programs and we can start testing the motion control on the complete instrument soon.
Always wanted to know how to build a SEMSANS instrument in only four minutes? Then check out the timelapse video we’ve made during the installation at ISIS!
We are very exited because a all things are coming together. We have installed the spin-echo components on the first arm (pre-sample) of LARMOR at ISIS. Now we have prepared everything for a experiment that has never been done! We will attempt to measure a SANS signal and SEMSANS signal (variation of SESANS) at the same time. This will give will enable us to measure structures with a size range from 1 nm to 5 (or more) micrometer!!!
We will start commissioning on the 16th of Feb. and hope to start the measurements soon after. The sample is prepared in close collaboration with the University of Bath.
In the picture above one can see the white SANS vessel that will lower the air scattering and enable us to see a clear SANS signal. On the right one can see the spin-echo components installed that will cause an in space modulated signal on a special beam stop that contains SESANS information. This will be the very first time they will be switched on at ISIS so fingers crossed.
This is what the neutrons will see when they travel through the flight tube. Sections of tapered Boron rubber so neutrons that plan not to participate in the measurement will end up in the small edges of Boron rubber.
Michel is now winding our biggest guide coils ever that will be used on the first table. The coil is slowly spinning with an strong electrical motor and Michel is running and climbing to feed in the wire.
We have tested the movement and locking system on the magnet. This appears to work better than expected. After this we even changed the gearing ration so it will move a bit faster than in the short movie made by Ernst…
Thanks to a big effort from our student Maurice we just measured the first oscillations that are the signature of LARMOR diffraction. On the photo the 4 RF flippers create a B-field parallel to the crystal plane in the sample (inside tube), HOPG in this case. Below on the left we can see the result of a scan with the position of the last RF flipper. On the right a similar result is found for a frequency scan of the last RF flipper.
The measurements are performed on a test beam line position at the RID (between the ROG and PEARL. The key components, the RF flippers and mu-metal boxes, are origination from FLEX in Berlin so many thanks to Dr. Habicht and Dr. Keller for this opportunity to gain some experience with these components.
We are building a High Resolution Larmor Diffraction instrument in the reactor hall of RID. The key components, the RF flippers are from the FLEX Triple axis instrument. With these flippers the first Larmor diffraction experiments were performed years ago in Berlin! This is an exciting opportunity to step in this field and reproducing some of the results….
LARMOR is a neutron scattering instrument that is now partially financed by a "NWO groot" grant and is been built at the UK neutron source ISIS. The basis is a competitive future proof SANS instrument fully paid, developed and run by ISIS. The Dutch contribution will significantly increase its functionality by exploiting a broad range of Larmor labeling methods in the space and time domain.