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.
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.
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…
To avoid any errors in our design and to get all the cables at the right length we made a wooden copy of the most important ISIS hardware on the two LARMOR tables. The next step is the Delft magnets and motion control and then we can practice the transfer from SANS to SESANS…
Four meters of brute power…
The RF AR-800 amplifiers are ready for testing…
If they pass the test we can already ship two pieces to ISIS for installation and test if it will add noise to the detector for example.
Installation of the Delft equipment on the LARMOR instrument at ISIS needs to be plug and play. To be sure this will be a smooth installation we have now the exact same tables. With this we can even practice the alignment procedure of the magnets and check what is the best way to run all the cables. One striking point…LARMOR tables are massive, next challenge is to find the space to put these in line…
The first picture shows the two tables with our 3D printed scaled model on top. The second picture shows the first table. We have added side support, at ISIS this table is bolted to the ground. Third picture shows the table that will hold the detector/SANS vessel and our magnets. The strips support the reference plane that will hold our translation stages.
Rob Dalgliesh from ISIS shows to Chris Duif and Jurrian Bakker from Delft the sample position at Larmor just before the first neutrons will arrive. On the left you can see the position sensitive detector.
Yesterday we received very good news from the UK. The first neutrons have been detected by the LARMOR instrument!!!!!!!
Click this link to read the official news on the ISIS website!
Today we visited the company Schelde Exotech situated in Vlissingen (NED). This company produced the vessel that will be used in the SANS mode. Today the leak rate test is performed and it will be shipped to ISIS soon for installation.
The LARMOR project was presented at the workshop
New Horizons in Polymer Characterisation
organised by the Dutch Polymer Institute (DPI) on Thursday 23 January 2014, in Eindhoven. The presentation can be downloaded here.