[mcstas-users] Simulation of ESS testbeamline instrument at HZB

[Peter Kjær Willendrup]

Dear Alaa,


Thank you for your email - I had a quick look at your instrument file and made some adjustments - see attached.

1) I Assume that in cases where your DiskChoppers are AT the same place they make up an “assembly” or GROUP? In these cases you should also
- Include the first of these choppers in the GROUP also -  done in the attached
- For each individual chopper assembly, there has to be a unique GROUP name, hence I created in total 5 GROUPS

2) Are BC_1 and BC_2 maybe meant to be counter-rotating? In that case I think you are missing a sign-change on the frequency parameter of one of them?

3) I added a new input parameter Chopper_in that via the WHEN keyword can disable all of the choppers beyond the first counter-rotating set.
- I also had to put a “dummy” arm component pr. chopper group to make sure there is a SCATTER when the group is deactivated by the WHEN.


We are now in the situation that neutrons are transported both when the choppers are in and out - further optimisation quite likely necessary (only 8 rays out of 1e7 makes it to the sample when choppers are in…), but this at least gives you a way forward. :-)


Hope this helps, and good luck moving further.

Best,

Peter Willendrup


Peter Kjær Willendrup
Senior Research Engineer, Special Advisor

DTU Physics

[cid:64fe8267-1c54-4f37-8253-f5095605ca04 at win.dtu.dk]


Technical University of Denmark



[cid:5ef5ea1c-d2c0-46bb-b91b-c78624c635c7 at win.dtu.dk]


Department of Physics
Fysikvej

Building 307

DK-2800 Kongens Lyngby

Direct +45 2125 4612

Mobil +45 2125 4612
Fax +45 4593 2399


pkwi at fysik.dtu.dk<mailto:pkwi at fysik.dtu.dk>


On 13 Dec 2016, at 10:16 , Ala'a Al-Falahat <alaa.falahat at gmail.com<mailto:alaa.falahat at gmail.com>> wrote:


Dear users,

I have started to simulate the ESS Test Beam Line at HZB center (please find the attached files to show the instrument in details).
I have generated proper code for it (see instrument file attached below) but I get a warning message that no neutron could reach to some component when I try to get a result,

Hopefully, you can find a solution on that.
For more information don't hesitate to contact me.

The first attached you should find at the page number 2 the whole instrument.
The second attached in appendix A , you should find the instrument in details.
The third attached you will find the instrument file I did.

with many wishes
Alaa











---------------------------------------------------------------------------------------------------------------------------

Institute of Applied Materials
Helmholtz-Zentrum Berlin for Materials and Energy
Hahn-Meitner-Platz , 1
14109 Berlin
Germany

<(First attached)The wavelength frame multiplication chopper system for the ESS test beamline at the BER II reactor.pdf><(second attached)The test beamline of the European Spallation Source – Instrumentation.pdf><V20TestBeamLineV2.instr>_______________________________________________
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