Helmholtz Zentrum Berlin

#HZBzlog

hzbEMIL • Watching the Secret Lives of Atoms

The Mirror Zoo

Updates

  • authored 3 years ago:

    Hitting the moon

    Less than 10 µm deviation over a distance of 65m - that's as if a football player shoots from earth …

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  • authored 3 years ago:

    Great Controllers, Encoders looking good

    We are almost done with our encoder testing procedures and it is looking good for our plans to work with absolute encoders at the EMIL beamline. We tested different engines and speeds, we made endurance tests and took the encoders apart as far as it was technically feasible. They still work fine.We also found, that the construction of the encoder ring and readhaed mount unit will be critical. This …

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  • authored 3 years ago:

    Ellipses rule

    To the naked eye, the mirrors in the beamlines may appear perfectly flat, but in fact they all have …

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  • authored 3 years ago:

    Gitterübergabe

    Die Messungen an drei Gitterrohlingen für Emil sind fertig. Sie sind alle innerhalb der Spezifikation.Nun wurden sie an das Institut "Präzisisionsgitter" übergeben. Vielleicht kommen schon im September die Gitterstrukturen auf die Blanks . Somit bin ich, was die Inspektion der Gitter angeht, erst einmal fertig. Andere Optiken werden aber sicher folgen…Hier könnt ihr euch mal ein residual …

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  • authored 3 years ago:

    An old mirror goes round robin

    In one of the many corners of the optics lab (yes, really, there are more than four!) lies an old, but not forgotten mirror from the good old days of BESSY-I. While it is well worn from years of reflecting synchrotron light, it is far from obsolete. In fact, as Frank Siewert points out, it is still very useful.As part of their work on metrology, many labs regularly check the performance of their …

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    comments
    • authored 3 years ago:

      Nice post with surprising information. I was not aware how much of invisible work is involved in keeping optical instruments really at their highest level of precision.

  • authored 3 years ago:

    Earthquake in the optics lab

    We talk a lot about the sensitivity of our instruments. This historical graph illustrates quite …

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  • authored 3 years ago:

    Mirror, mirror – are you good enough for EMIL?

    Last week, we had the possibility to measure our EMIL-M1-hard-X-ray toroidal mirror with the big reflectometer at the Metrological Light Source of the PTB. Thanks to the colleagues there, we will finally be able to analyze whether the new mirror holds all its promises. The mirror is a narrow strip, one meter long, with two different curvatures, like a segment of a bicycle tube, with a golden …

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  • authored 3 years ago:

    Classic: Object in mirror…

    Since it's all about mirrors these days, here's one by XKCD.

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  • authored 3 years ago:

    Dress code for the clean tent

    I was not aware of it, but apparently we humans are like snakes: every month, we change our complete skin, so no wonder that we are constantly shedding skin particles, hairs and water drops or worse. But if you work with optical elements, cleanliness has to become an obsession. Dust on your samples could scatter light in unwanted directions or even scratch their perfect surfaces. The Metrology …

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  • authored 3 years ago:

    With THE MIRROR in the clean room

    We had to dress up appropriately to enter the clean room at MLS. Next week I will report, why we …

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  • authored 3 years ago:

    Strange encounters at BESSY II - The Wallman

    The more time you spend around a synchrotron, the more strange things you meet. Like this one, three …

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    comments
    • authored 3 years ago:

      Thanks Mike, that narrows it down a bit. Somebody must have made a real effort to fix the little guy on this narrow ledge. Looks like he might fall off any second - but apparently, he doesn't.

    • authored 3 years ago:

      I certainly would've noticed when I was there in 2009, so I suppose that poor guy was put there sometime during the last four years.

  • authored 3 years ago:

    Solarzellen und mehr: „Alle meine Doktoranden und Postdocs sollen später am EMIL messen – und ich will das natürlich auch,“ sagt Simone Raoux

    Eine der Wissenschaftlerinnen, die später auf ein möglichst präzises Synchrotronlicht bei EMIL angewiesen sein werden, ist die Physikerin Simone Raoux. Seit Januar 2014 baut sie am HZB das Institut für Nanospektroskopie für Design und die Optimierung energierelevanter Materialien auf.Sie haben lange in den USA gelebt und gearbeitet. Warum sind Sie von New York ans HZB gekommen?Ich war etwa 25 …

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  • authored 3 years ago:

    To Overview the Mirror Zoo

    EMIL requires more than 20 optical elements, like mirrors, which have to be accurately positioned. So it is important to know about the exact angles of the mirrors in the beamline and to adjust them. To realize a very high precision, a computer-based system controls the modulation. Therefore, it is necessary to translate the analogue data of the angles into a digital code. So-called encoders are …

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  • authored 3 years ago:

    Machine-level coding – one trade-off at a time

    The most precise gratings on the planet are useless if you can’t position them with equal precision. This is the task of Andreas Balzer and Ervis Suljoti, who build and program the controllers for the precise movements of the optical elements at EMIL (and all the other beamlines of BESSY, too).For EMIL, they are currently testing a type of encoder that is different from the incremental encoders …

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  • authored 3 years ago:

    Präzisionsgitter. Hausgemacht.

    Marcus Lörgen leitet die Abteilung Präzisionsgitter am HZB, in der auch die Gitter für EMIL hergestellt werden.Wozu braucht man diese Gitter?Für ihre Experimente wollen Wissenschaftlerinnen und Wissenschaftler am liebsten immer einen Lichtstrahl mit genau einer Wellenlänge haben. Das geht natürlich nicht, sondern man hat immer ein Bündel. Aber dann möchte man wenigstens ein besonders kleines …

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  • authored 3 years ago:

    Goethe vs. Newton

    He may have been wrong, Goethe, about the nature of light, and Newton got it right, but I still find Goethe's plates in the "Farbenlehre" beautiful and strangely fascinating.All plates can be found here. And the entire book is here.Zum Anlass des 200. Jubiläums der "Farbenlehre" 2010 gab's diesen schönen Artikel von Elisabeth von Thadden in der Zeit: Schöner irren - […] Über die seltsame …

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  • authored 3 years ago:

    How many doors do you count?

    For the high precision measurements at the optics lab at HZB, every vibration, every change of …

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  • authored 3 years ago:

    High tech positioning tool

    Positioning the samples in the NOM is a bit tricky and can take a lot of time. So we designed some …

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  • authored 3 years ago:

    Running the NOM

    Jana Buchheim is setting up the NOM for measurements of the grating blanks for EMIL. To get a …

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  • authored 3 years ago:

    What the white light sees

    This is the output from the white light interferometer for the first of the EMIL-grating blanks. …

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  • authored 3 years ago:

    By the book

    At the optics group, we handle a lot of measurements and each and every one of them follows a …

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  • authored 3 years ago:

    Blanks need attention too!

    In addition to mirrors that we use to direct and focus our beams of synchrotron light, we also need high precision gratings to diffract the light. The blank substrates for these gratings are coming from Zeiss, but the rest of the production is happening here at HZB.A few days ago, I received the blanks for the EMIL-beamline and before we can move to the next steps I have to measure them to make …

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  • authored 3 years ago:

    IPS-20: Solar minds meet in Berlin

    Many of us will be at the 20th International Conference on Photochemical Conversion and Storage of …

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    comments
    • authored 3 years ago:

      I was thrilled by the talk of Michael Graetzel, who has build up the research on Dye Sensitized Solar Cells. And he said: Silicon is here to stay! My conclusion: There is no: one size fits all! We will need many different types of PV materials, each of it for specific purposes.

  • authored 4 years ago:

    Licht für EMIL

    Die Spiegel und anderen optischen Elemente sollen das Synchrotronlicht lenken, das der große Nachbar …

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    comments
    • authored 3 years ago:

      Kleine Ergänzung: Der Shutdown und die Arbeiten, über die Christian hier spricht, bezogen sich auf den letzten Sommer, also 2013. In diesem Jahr werden wir schon die Fertigstellung des Gebäudes feiern. Und noch ein Tipp: Christian hat mehrfach die Kavitäten erwähnt, die eine wichtige Rolle spielen. Hier bei BESSY-VSR, unserem anderen Projekt, was man auch im #HZBzlog verfolgen kann, gibt es eine Erläuterung, was Kavitäten sind: http://hzbzlog.com/bessyvsr/dancing-with-the-beam/xyxPq8H5i

  • authored 4 years ago:

    Strange encounters at BESSY II

    I met this little guy on the way to the optics lab in building 15.8 today. Does anybody know his …

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  • authored 4 years ago:

    Seven years of unlucky love

    Yesterday I met with our mirror manufacturer Alexander Pilz who came all the way from Oberkochen to find out what might be salvageable from the broken mirror. It was a short visit. After we cleaned off the dust with acetone, we didn't even bother to continue with any measurements. We had been aware of the deep scratches on the one side, but hoped to be able to use parts of the other side. No such …

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    comments
  • authored 4 years ago:

    From Legolas to Diffraction

    To start off your week lightly (and while Jana an her colleagues are trying to assess the damage on …

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  • authored 4 years ago:

    Transport Damage

    This is what is not supposed to happen. I finally got the last of four cylinder mirrors for the CISSY-beamline from the manufacturer in southern Germany for final inspection.When I opened the package, this is what I should have seen: A smooth surface without any damages.Instead, I found this:A damaged mirror with a huge break at the backside of the mirror. It's a pretty bad mess. The whole point …

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  • authored 4 years ago:

    Broken Mirror

    Earlier this week, mechanical engineer Jana Buchheim received the long awaited last of four cylinder …

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  • authored 4 years ago:

    Das EMIL-Spiegelkabinett oder: Präzise auf den Mond schießen

    Ein Mensch ohne Bildung ist wie ein Spiegel ohne Politur. Und ohne Politur ist Berlins größte und aufwendigste Lampe, das Synchrotron BESSY II, nur eine mickrige Funzel.Das optische Kernstück von EMIL, dem neuen Speziallabor am BESSY II, ist ein 65 Meter langes Strahlrohr, welches die Synchrotronstrahlung in einem Energiebereich von 80 eV bis 10.000 eV von der Quelle (dem Undulator) bis zum …

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