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

Ralph Ernstorfer ernstorfer at fhi-berlin.mpg.de
Mon Nov 26 08:27:07 CET 2018


Michael, Marko, Oleksy,

please find a summary of your visit including Tommaso's analysis of the
data taken on Wednesday.

As SPECS is our legal business partner, I ask for a statement from SPECS
either agreeing to the summary or providing specific comments and
additions (please use the commenting tools of your pdf viewer) to the
summary.

I suggest that we have a telephone conference in the second half of this
week to discuss the next and hopefully last step for removing the
magnetic field distortions. I would also like to discuss the most urgent
software issues then.

Cheers,
  Ralph

On 19.11.2018 11:06, Ralph Ernstorfer wrote:
>
> 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*
>>
>> T +49 30 467 824-94 44
>> F +49 30 46 42 083
>> E support at specs.com <mailto:support at specs.com>
>> SPECS Surface Nano Analysis GmbH
>> Voltastrasse 5 13355 Berlin / Germany
>> *www.specs.com <http://www.specs.com>*
>>
>> Innovation in Surface Spectroscopy and Microscopy Systems
>> CEO Dr. Ferdinand Bartels
>> Registered Office Berlin
>> Companies Commercial Register No. 93 HRB 21390
>> Register Court Charlottenburg
>>
>> <http://bit.ly/facebook_specs>  <http://bit.ly/specsyoutube>> <http://bit.ly/twitter_specs>  <http://bit.ly/specs_li>
>>
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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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>
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-- 
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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