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

Marko.Wietstruk at specs.com Marko.Wietstruk at specs.com
Tue Nov 27 12:56:21 CET 2018


Dear all,
I have a KREIOS demonstration for customers on Thursday and Friday, but we can have this telephone conference on Thursday from 9:30 to 10 am.

Best regards
Marko


Marko Wietstruk
Research and Development

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Von: Ralph Ernstorfer [mailto:ernstorfer at fhi-berlin.mpg.de]
Gesendet: Montag, 26. November 2018 15:37
An: Michael Kallmayer; 01_support-INBOX; trarpes at fhi-lists.de; Sven Kubala; Marko Wietstruk
Cc: ellguth at surface-concept.de
Betreff: Re: [trARPES] METIS: visit of SPECS and SurfaceConcepts, 20.+21.11.


Fine with me. I would appreciate if we could fix the time by tomorrow. Marko, your call.

Cheers,
  Ralph
Am 26.11.2018 um 15:30 schrieb Michael Kallmayer:

Dear Ralph,

thank you for sending the summary. We (SC) propose a telephone conference on Thursday, 29th Nov.  between 9:00 a.m. and 12:00 a.m. Is this convenient for you ?

Best regards

Michael
Am 26.11.2018 um 08:27 schrieb Ralph Ernstorfer:

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<mailto: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


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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<mailto: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

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--

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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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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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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