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

Marko.Wietstruk at specs.com Marko.Wietstruk at specs.com
Mon Nov 19 10:02:30 CET 2018


Dear Ralph,
regarding the demagnetization procedure,
I will bring a device with me, with a long Cu rod, that will be put into the ToF-Chamber. Then we will apply a large 50Hz AC current, that will be decreased to 0 in a few seconds. I’m not sure if we can use this procedure also for the spin-chamber.

Why should we bring the spools again?

Best Regards
Marko


Marko Wietstruk
Research and Development

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Von: Ralph Ernstorfer [mailto:ernstorfer at fhi-berlin.mpg.de]
Gesendet: Montag, 19. November 2018 09:09
An: trarpes at fhi-lists.de; Sven Kubala; Marko Wietstruk; 01_support-INBOX; Michael Kallmayer
Betreff: Re: METIS: visit of SPECS and SurfaceConcepts, 20.+21.11.


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<mailto: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<mailto: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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