[neutron-mc] Re: neutron-mc Digest, Vol 25, Issue 6

Fri Jan 26 14:47:30 CET 2007

Thank you very much!

Feng Liang
Neutron Scattering Laboratory
China Institute of Atomic Energy

  Beijing P.O. Box 275(30)
  102413 Beijing
  China
Tel:+86-10-69357727
Fax:+86-10-69357787
----- Original Message ----- 
From: <neutron-mc-request at risoe.dk>
To: <neutron-mc at risoe.dk>
Sent: Thursday, January 25, 2007 5:56 PM
Subject: neutron-mc Digest, Vol 25, Issue 6

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Today's Topics:

   1. Could you please give me a hand? (Feng Liang)
   2. RE: Trouble with Single_Crystal (peter.willendrup at risoe.dk)
   3. RE: Could you please give me a hand? (peter.willendrup at risoe.dk)

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

Message: 1
Date: Thu, 25 Jan 2007 15:30:41 +0800
From: Feng Liang <fliang at ciae.ac.cn>
Subject: [neutron-mc] Could you please give me a hand?
To: neutron-mc at risoe.dk
Message-ID: <006b01c74052$b7760710$39410a0a at 6311fc60030c48d>
Content-Type: text/plain; charset="gb2312"

Hallo! Thank you for reading my message. I'm a student form Neutron Scattering Laboratory in China Institute of Atomic Energy, CHN. I have konwn the great M-C program MCSTAS for a long time. 

Now, we will design and install some neutron scattering instruments at our new reactor CARR, but I still have some problems about runing the MCSTAS under the windows system. And I have no experience about using the program. 

So could you please send me a example of a simple SANS instrument simulation just including the cold neutron source, neutron guide, collimation guide, sample station and the dector? I am so appreciate about that help!

Thank you very much! Looking forward your help.

Best regards

Feng Liang
Neutron Scattering Laboratory
China Institute of Atomic Energy

  Beijing P.O. Box 275(30)
  102413 Beijing
  China
Tel:+86-10-69357727
Fax:+86-10-69357787
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Message: 2
Date: Thu, 25 Jan 2007 10:46:36 +0100
From: peter.willendrup at risoe.dk
Subject: RE: [neutron-mc] Trouble with Single_Crystal
To: neutron-mc at risoe.dk
Message-ID:
<6463F256A85DC14CAB07F087A2479972282203 at EXCHG-VS1.risoe.dk>
Content-Type: text/plain; charset="iso-8859-1"

Hi Aaron,

I have not had time to fully investigate your problem. From an earlier attempt to use Single_crystal it seems to me that we might indeed have a problem concerning definition of the internal coordinate system.

Will get back to you (and this mailinglist) when I have looked more carefully.

Cheers,

Peter Willendrup

-- 

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

Peter Willendrup, MSc

Materials Research Department

Building 227

Risø National Laboratory

Technical University of Denmark

Frederiksborgvej 399

DK-4000 Roskilde

Denmark

Tel:  (+45) 4677 5862

Fax:  (+45) 4677 5758

Email: Peter.Willendrup at risoe.dk

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

>From 1 January 2007, Risø National Laboratory, the Danish Institute for

Food and Veterinary Research, the Danish Institute for Fisheries

Research, the Danish National Space Center and the Danish Transport

Research Institute have been merged with the Technical University of

Denmark (DTU) with DTU as the continuing unit. 

________________________________

From: neutron-mc-bounces at risoe.dk [mailto:neutron-mc-bounces at risoe.dk] On Behalf Of Aaron M. Percival
Sent: Tuesday, January 23, 2007 7:16 PM
To: 'McStas users list at neutron.risoe.dk'
Subject: [neutron-mc] Trouble with Single_Crystal

Hello all,

I'm having a little bit of trouble with the single_crystal component.  I've created a .lau file in Crystallographica to simulate an Si analyzer crystal.  I simply want to reflect a neutron beam of wavelength 2.866 A using the 311 plane (d = 1.637) of Si.  So I've set up the crystal to satisfy the Bragg condition, giving theta = 61.823, and thus 2theta = 123.646.  I put a banana shaped detector around this 2theta, and I get no reflections.

Here is the crystal:

COMPONENT analyzer = Single_crystal(

    reflections = "Si.lau", xwidth = 0.1, yheight = 0.1,

    zthick = 0.01, delta_d_d = 0, mosaic = 18, order = 0,

    p_transmit = 0, absorption = 0, incoherent = 0, ax = 5.430530,

    by = 5.430530, cz = 5.430530, aa = 90, bb = 90, cc = 90)

  AT (0, 0, 0) RELATIVE a1

  ROTATED ( 0, theta311, 0) RELATIVE sample_arm

Where theta311 = 61.823 relative to the incident beam.

Can any one offer any suggestions as to why this might not be working?

I've also attached the Si.lau file.

Thanks, 

Aaron

*************************************************

Aaron M. Percival

M.Sc. Candidate

Dept. of Physics, Engineering Physics & Astronomy

Queen's University

Kingston, Ontario, Canada, K7L 3N6

Office: 613-533-6000 ext. 74789

Fax: 613-533-6463

*************************************************

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Message: 3
Date: Thu, 25 Jan 2007 10:56:08 +0100
From: peter.willendrup at risoe.dk
Subject: RE: [neutron-mc] Could you please give me a hand?
To: neutron-mc at risoe.dk
Message-ID:
<6463F256A85DC14CAB07F087A2479972282204 at EXCHG-VS1.risoe.dk>
Content-Type: text/plain; charset="iso-8859-1"

Hello Feng,

The McStas installation includes a simple SANS instrument file as the one you are looking for. Once installed,

it is available in c:/McStas/lib/examples/SANS.instr.

Regarding installation and use of McStas, refer to the instructions given in the installer and the manual. The simplest way to install McStas on Windows is to download and execute

http://www.mcstas.org/downloads/McStas-1.10-i686-Win32.exe

(Say 'yes' everywhere and click 'next' all the way).

Hope this helps,

Peter Willendrup

-- 

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

Peter Willendrup, MSc

Materials Research Department

Building 227

Risø National Laboratory

Technical University of Denmark

Frederiksborgvej 399

DK-4000 Roskilde

Denmark

Tel:  (+45) 4677 5862

Fax:  (+45) 4677 5758

Email: Peter.Willendrup at risoe.dk

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

>From 1 January 2007, Risø National Laboratory, the Danish Institute for

Food and Veterinary Research, the Danish Institute for Fisheries

Research, the Danish National Space Center and the Danish Transport

Research Institute have been merged with the Technical University of

Denmark (DTU) with DTU as the continuing unit. 

________________________________

From: neutron-mc-bounces at risoe.dk [mailto:neutron-mc-bounces at risoe.dk] On Behalf Of Feng Liang
Sent: Thursday, January 25, 2007 8:31 AM
To: neutron-mc at risoe.dk
Subject: [neutron-mc] Could you please give me a hand?

Hallo! Thank you for reading my message. I'm a student form Neutron Scattering Laboratory in China Institute of Atomic Energy, CHN. I have konwn the great M-C program MCSTAS for a long time. 

Now, we will design and install some neutron scattering instruments at our new reactor CARR, but I still have some problems about runing the MCSTAS under the windows system. And I have no experience about using the program. 

So could you please send me a example of a simple SANS instrument simulation just including the cold neutron source, neutron guide, collimation guide, sample station and the dector? I am so appreciate about that help!

Thank you very much! Looking forward your help.

Best regards

Feng Liang
Neutron Scattering Laboratory
China Institute of Atomic Energy

  Beijing P.O. Box 275(30)
  102413 Beijing
  China
Tel:+86-10-69357727
Fax:+86-10-69357787

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End of neutron-mc Digest, Vol 25, Issue 6
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