[mcstas-users] curved guide

Fri Jul 19 14:28:13 CEST 2019

(This is a resend - have re-enabled everyone who are on gmail, to allow you to receive mcstas-users messages again… Sorry to everyone else for the double-post)

Hi Andrew,

Excellent, thanks for that!

Unfortunately it seems several mailservers around either distrusts .comp attachments or your git URL from below - I got excessive bouncing from the mailinglist…

I therefore respond here without the component and having inserted some underscores in the below url for scrambling… :-)

I hope it is OK that I have uploaded your component to the “McStas share” at
http://www.mcstas.org/download/share/  ?

- If you want I can also put a copy in the McStas repo toward the next release which should happen later this summer/fall?

Cheers,

Peter

On 19 Jul 2019, at 13.10, Andrew Jackson <andrew.jackson at esss.se<mailto:andrew.jackson at esss.se>> wrote:

Hi Peter

We (Richard Heenan and I) have a component that we use for the LoKI benders (attached) which was a modification of the Pol_bender component to allow us to have it bending downwards/upwards and still have functional gravity. This allows for different reflectivities and is truly curved as well as giving a curved representation in the model.

You can find our LoKI model on bitbucket (link below) if you want to see how we use it.

https_://_bitbucket.org_/essloki/loki-mcstas-master/src/master/_

Cheers
Andrew
______________________________________
Andrew Jackson
Neutron Instruments Division
European Spallation Source, Box 176, SE-221 00 Lund, Sweden

Phone: +46 72 179 2015

On 2019-07-18, 13:28, "mcstas-users on behalf of Peter Link" <mcstas-users-bounces at mcstas.org<mailto:mcstas-users-bounces at mcstas.org> on behalf of Peter.Link at frm2.tum.de<mailto:Peter.Link at frm2.tum.de>> wrote:

   Dear friends,

   just to avoid some double developpment: to my knowlegde there are the
   following components or ways to simulate a standard curved neutron guide:

   Bender; allows for different reflectivities on top/bottom inside
   outside; can have multiple channels; but behaves geometrically as
   straight guide element (mcdisplay, coordinates of subsequent elements)

   Guide_curved; only one reflectivity definition for all sides,
   geometrically correct definition

   polygon of Guide_gravity elements; allows for a polygonal approximation
   only, has numerous options

   Having a number of truly curved guides in my simulations I would prefer
   to have a component, which has the possibilities as it has Bender or
   Guide_gravity but is a geomentrical correct implementation of truly
   curved guide. If someone has done this or can tell me where I have
   overseen it, I would be grateful.

   Bets regards

   Peter

   --
   Dr. Peter Link
   Leiter Neutronenoptik
   Technische Universität München
   Heinz Maier-Leibnitz Zentrum (MLZ)

   Lichtenbergstr. 1
   85747 Garching

   Tel.: +49 (0)89 289 14622
   Fax: +49 (0) 89 289 11694

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Peter Kjær Willendrup
Forskningsingeniør, Specialkonsulent
Næstformand for DTU Fysik LSU

DTU Physics

[cid:b6339554-7f28-441d-9f31-5944f811397c at win.dtu.dk]

Technical University of Denmark

[cid:e108e480-fcab-46e2-9531-b38165079572 at win.dtu.dk]

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