Helmholtz Zentrum Berlin

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hzbHFM • Building the Strongest Magnet­ in the World of Neutron Scattering

Wie quetscht man einen Superhelden in eine Matrioschka-Puppe?

Updates

  • authored 3 years ago:

    Geschafft!

    Nachdem der Magnet letzten Herbst in der Testhalle bereits gezeigt hatte, was er kann, steht er nun …

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  • authored 3 years ago:

    Panzerknacker 2.0 - Wir knacken die 26 Tesla!

    Die Panzerknackerinnen Jennifer Bierbaum und Stefanie Kodalle knacken die 26 Telsa des …

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  • authored 3 years ago:

    The beam guide

    The neutron beam guide needs to be as close to the sample as possible. Meaning it has to extend into …

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  • authored 3 years ago:

    3 entscheidende Fragen

    Wir werden uns noch etwas gedulden müssen, um zu testen wie unser Kryostat im Magnetfeld funktioniert. Zuerst werden die Änderungen am Hochfeldmagneten bezüglich der Schnellabschaltung getestet. Dann sind wir dran und werden einige interessante Fragen genauer untersuchen können:1.) Wie warm wird die Probe, wenn das Feld verändert wird und wie lange wird es dauern, sie wieder abzukühlen?2.) Wie …

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    comments
    • authored 3 years ago:

      Es hört nicht auf! Kaum ist eins geschafft, warten schön wieder siebenzehnzig neue Fragen! Vergeht euch da nicht manchmal auch die Lust??

  • authored 3 years ago:

    Ein Blick unter die Haube

    auf Roberts Friemelwork aus Lemosteckerrevolver, 3-He Verdampfer, Heizern und vielen Thermometern.

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  • authored 3 years ago:

    "Abgespeckte Schwester"

    Während Sebastian noch auf den Piezomotor wartet für das Nadelventil wird an anderer Stelle bereits mit dem Bau der "abgespeckten Schwester" begonnen.Um den Probenwechsel schneller zu gestalten wird der jetzige Kryostat eine "abgespeckt Schwester" bekommen, wie Sebastian sie genannt hat. Sie wird fast baugleich zu dem jetzigen Kryostaten sein, aber nur den 4-He Kreislauf haben. Dadurch werden die …

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  • authored 3 years ago:

    Das Nadelventil

    Um die Probenumgebung herunterzukühlen, soll beständig Helium durch das System fließen. Nun wäre es natürlich sehr hilfreich, wenn sich auch bestimmen ließe, wie viel Helium in welcher Zeit durch das System transportiert wird. Dazu hat das HFM-Team unter anderem Nadelventile eingeplant.Nadelventile zeichnen sich durch eine sehr kleine Öffnung und einen nadelförmigen Kolben aus. Je nachdem, wie …

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  • authored 3 years ago:

    Der letzte Schliff

    der Magnet wird bereits wieder abgekühlt, da es nur noch ein paar Handgriffe bis zum "Commissioning" …

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  • authored 3 years ago:

    Prototyping

    a lot of the work Robert and Sebastian are doing is designing and building Prototypes. In grey is …

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    comments
  • authored 3 years ago:

    7

    Halbleiterthermometer hat die Probenumgebung unter der Haube und zwei Heizer. Es waren aber mal 8! …

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    comments
    • authored 3 years ago:

      Das sieht toll aus. Noch toller finde ich nur, dass alles schon fast ganz fertig ist. Ich bin sehr gespannt auf die allererste Messung mit einer echten Probe.

  • authored 3 years ago:

    580mK und die Augen leuchten

    Wir waren in ein längeres Interview mit Peter Smeibidl vertieft als die Tür aufging ( ja, wir haben mal wieder unser "Bitte nicht stören Schild" vergessen) und Sebastian seinen Kopf reinsteckte und aufgeregt rief: "580, Peter! Oh..."Peter Smeibidls Augen blitzten auf und er war kurz davor aus dem Stuhl zu springen: "580?! Darüber müssen wir reden sobald ich hier fertig bin."Beide schauen sich …

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  • authored 3 years ago:

    Cold Trap

    We talked about Helium and its advantages in cooling something down. In fact, Helium is the only cryogenic liquid that can be used to reach such low temperatures. But we might have a problem here. Because we use very thin wires, so called capillaries, to transport the helium (which is all right because under the right conditions it becomes a suprafluid). But if there is anything else in the …

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    comments
    • authored 3 years ago:

      "superfluidity-...where it appears to exhibit the ability to self-propel and travel in a way that defies the forces of gravity and surface tension." Cool! I wish I could defy the forces of gravity sometimes.

  • authored 3 years ago:

    Friemelwork

    “Friemeln” – this German verb immediately popped up in my mind when I looked at this photo of Robert …

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  • authored 3 years ago:

    How many thermometers

    are built into the sample environment to keep track of the temperature? Take a guess.

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    comments
  • authored 3 years ago:

    Engineering goes modern art

    Because there are so many thermometers built into the sample environment it would be very time …

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  • authored 3 years ago:

    It's getting cold in here

    In solid state physics, temperature is a big factor for the performance of materials. Therefore it is nice to watch samples at different temperatures, especially at very, very low ones. To reach temperatures near to 0 K, helium is the way to go.To provide a comfy sample environment below 1 Kelvin (-272,15 °C), the HFM-Team developed a cooling system that is working continuously (no refill of …

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  • authored 3 years ago:

    Spin-off Beauty

    Robert’s construction of the sample environment is intricate but minimalistic at the same time. He …

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    comments
  • authored 3 years ago:

    stability vs. heat conduction

    In order to be able to cool down the system, one of the main concerns is keeping heat conduction to an absolute minimum. Heat will travel through every screw and every connection - so it is far easier said than done.In previous posts we have seen a lot of the different shields that form the sample environment. Now, we take a closer look at one special problem concerning heat exchange that Robert …

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  • authored 3 years ago:

    Priority N° 1

    Getting the sample environment as cool as possible is Sebastians and my Priority N° 1 right now. Coming from the sample environment group Sebastian joined me to work specifically on the high field magnet sample environment a few months ago. It is great to share ideas and benefit from his knowledge in the day to day work. It also ensures that we can keep up the pace.Everybody is scrambling to …

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    comments
    • authored 3 years ago:

      Thank you for beeing patient with the film crew. I imagine that "beehive" last week and I am eager to see the film.

  • authored 3 years ago:

    Sample Environment - close-up

    Here, we see another compilation of sketches made by Robert to illustrate the HFM's sample …

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    comments
    • authored 3 years ago:

      That's a good question, Kerstin! And it's not as easy for me to answer as I had expected it to be... Basically, vacuum and superlow temperatures are two completely different things, so you also need different shields to maintain them. Concerning the different temperature shields, I think they result from the fact that you can't cool the whole system down instantaneously, but in steps. So for each temperature step, there is a new shield. As you can see in the image, the coppery 2K-shield only covers the very tip of the sample environment, because just there we get to temperatures lower than 2 Kelvin.

    • authored 3 years ago:

      Interesting! So each layer brings you closer to the desired condition: first vacuum, then cold, then very cold… Why can't you do it all in one step?

  • authored 3 years ago:

    Sample Environment

    At the beginning of this episode, Sibylle was writing about the “eierlegende Wollmilchsau”; the …

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  • authored 3 years ago:

    30° degrees of freedom

    In order for the magnet to move 15° left as well as 15° right of the neutron beam axis some …

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    comments
    • authored 3 years ago:

      Those are quite some pipes! One is beginning to get an idea about just how much water they need to keep the magnet cool.

  • authored 3 years ago:

    Heavy lifting

    Everybody who is moving house is dreading the washing machine. It's heavy, it's clunky, it's a real …

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  • authored 3 years ago:

    Moving 25 tons of steel - mission complete

    While Robert is dealing with the sample environment his colleagues had to move the magnet to the neutron guide hall. It’s done: The high field magnet reached its final destination right in front of the neutron beam conductor. It made its way out of the technikum, around and into the hall to the final position. The move was accompanied by many interested people, watching the team move the magnet …

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  • authored 3 years ago:

    eierlegende Wollmilchsau (an egg laying Wool-milk-pig)

    Robert is responsible for building the sample environment for the magnet, the tiny space inside all this big machinery where the actual measurements will be happening.The magnet is designed to be used by many different researchers from all over the world who seek answers for a very wide range of questions. For Robert, this means, the sample environment has to become the proverbial „eierlegende …

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