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

Ralph Ernstorfer ernstorfer at fhi-berlin.mpg.de
Mon Nov 19 11:06:24 CET 2018


Dear Oleksy, Marko,

we need 10 screws M8 x 55 (or slightly longer).

Regarding the spools: during your visit, we have seen that the magnetic
fields of the spools have an effect on the electron trajectories. We did
not see a clear improvement, though. These tests, however, were not
perfectly systematic as we did not do energy-dependent measurements for
different spool configurations. With the magnetic fields sensor inside
the METIS, we have an absolute measure of the fields and could try to
minimize the fields. Depending on what we identify as the origin of the
magnetic field distortions, the spools could act as an interim solution
for improving the situation.

Another thing we had discussed: do you have a spare µ-metal inlay, which
we could potentially test.

Cheers,
  Ralph


Am 19.11.2018 um 10:07 schrieb Support at specs.com:
>
> Dear Ralph,
>
>  
>
> We will bring tomorrow screws, tools for opening the flange and
> demagnetization device. We will discuss if we really need spools for
> this visit. Could you please write me what screws length I shall
> bring? In order to have all screws same length on the flange. Thank you.
>
>  
>
> Best Regards,
>
> Oleksiy
>
>  
>
> *SPECS Service and Support*
>
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>
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> *From:*Ralph Ernstorfer [mailto:ernstorfer at fhi-berlin.mpg.de]
> *Sent:* Montag, 19. November 2018 09:09
> *To:* trarpes at fhi-lists.de; Sven Kubala; Marko Wietstruk;
> 01_support-INBOX; Michael Kallmayer
> *Subject:* 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/

-- 
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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