[trARPES] METIS: visit of SPECS and SurfaceConcepts, 20.+21.11.

Ralph Ernstorfer ernstorfer at fhi-berlin.mpg.de
Mon Nov 19 09:08:35 CET 2018


Dear Marko, Oleksy,

can you give us an update regarding potential procedures for
demagnetization, which you wanted to discuss with SPECS-colleagues?

Can you confirm that you will bring the replacement screws and the spools?

Cheers,
  Ralph


Am 13.11.2018 um 15:04 schrieb Ralph Ernstorfer:
>
> Dear all,
>
> SPECS (Marko Wietstruk & Oleksy) and Surface Concepts (Michael
> Kallmayer) will come next week Tuesday & Wednesday. We will start
> Tuesday, 20.11., 8 am.
>
> The work plan looks roughly like this:
>
>   * venting of the chamber (in retracted position), removal of the
>     springs supporting the METIS translation.
>   * rotation of the METIS extractor and installation of the unshielded
>     HV cable. The HV feedthrough will be installed in another port.
>     responsible person: Marko
>   * opening of the METIS on the detector side, remove the TOF chamber,
>     unmount the TOF tube, reinstall TOF chamber, perform magnetic
>     field measurements inside the TOF chamber. responsible person:
>     Michael (he will arrive Tuesday around lunch time).
>   * the suspicious component is a µ-metal inlay bridging the flange
>     connecting the TOF chamber with the so-called spin-replacement
>     chamber. I think it would be good to visually inspect the
>     mechanical connection of the inlay with a camera brought inside
>     the TOF chamber.
>   * in case magnetic fields enter at the inlay, we will try mechanical
>     deformation to improve the magnetic closure. Otherwise a
>     measurement of the inner geometry needs to be done and a new
>     µ-metal inlay needs to be fabricated.
>   * goal: magnetic fields inside the TOF tube <= 0.1 µT
>   * another aspect to clarify is the origin of the fairly strong
>     magnetic fields outside the chamber and the apparent magnetization
>     of the METIS tubes. Measurement of the magnetic fields in the
>     vicinity of the detached TOF chamber and the fields at the
>     position of the TOF chamber (while it is detached).
>   * FHI-internal: remove dropped sample from the analysis chamber.
>
> Equipment:
>
>   * magnetic field sensor (SPECS)
>   * special wrenches for the hardly accessible 200 flange (SPECS)
>   * spools and power supply (SPECS)
>   * camera (FHI)
>   * non-magnetic screws for replacing the V2A screws (SPECS)
>
> To be clarified before the visit:
>
>   * tool and procedure for demagnetization (?), SPECS
>   * accommodation for Michael
>
> Cheers,
>   Ralph
>
> -- 
> Ralph Ernstorfer                            ernstorfer at fhi-berlin.mpg.de
> Research Group Structural and Electronic Surface Dynamics
> ERC project FLATLAND
> Fritz Haber Institute
> Faradayweg 4-6                              Tel: +49 30 8413-5117
> 14195 Berlin                                Fax: +49 30 8413-5387
> Germany
> http://w0.rz-berlin.mpg.de/pc/ernstorfer/

-- 
Ralph Ernstorfer                            ernstorfer at fhi-berlin.mpg.de
Research Group Structural and Electronic Surface Dynamics
ERC project FLATLAND
Fritz Haber Institute
Faradayweg 4-6                              Tel: +49 30 8413-5117
14195 Berlin                                Fax: +49 30 8413-5387
Germany
http://w0.rz-berlin.mpg.de/pc/ernstorfer/

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