From lefmann at fys.ku.dk  Tue Apr  1 17:16:30 2008
From: lefmann at fys.ku.dk (Kim Lefmann)
Date: Tue, 01 Apr 2008 17:16:30 +0200 (CEST)
Subject: [neutron-mc] New address
Message-ID: <alpine.LRH.1.00.0804011714400.28747@johansen.fys.ku.dk>

Dear fellow simulators,

I have accepted a professorship at University of Copenhagen, starting 
today. Of course, I stay with simulations, and remain as coordinator of 
MCNSI and the coming FP7 network.

best,
       Kim




From skoulatos at gmail.com  Tue Apr  1 17:20:45 2008
From: skoulatos at gmail.com (Markos Skoulatos)
Date: Tue, 01 Apr 2008 17:20:45 +0200
Subject: [neutron-mc] New address
In-Reply-To: <alpine.LRH.1.00.0804011714400.28747@johansen.fys.ku.dk>
References: <alpine.LRH.1.00.0804011714400.28747@johansen.fys.ku.dk>
Message-ID: <20c7eff60804010820k9708d0ala3b77b0c9366ae51@mail.gmail.com>

Hi Professor Kim and Congratulations!
This is Markos from Klaus' group in HMI.

I wish you to have no troubles at all! :)

Markos

On Tue, Apr 1, 2008 at 5:16 PM, Kim Lefmann <lefmann at fys.ku.dk> wrote:

> Dear fellow simulators,
>
> I have accepted a professorship at University of Copenhagen, starting
> today. Of course, I stay with simulations, and remain as coordinator of
> MCNSI and the coming FP7 network.
>
> best,
>      Kim
>
>
> _______________________________________________
> neutron-mc mailing list
> neutron-mc at risoe.dk
> http://mailman.risoe.dk/mailman/listinfo/neutron-mc
>
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From bordallo at hmi.de  Tue Apr  1 17:24:00 2008
From: bordallo at hmi.de (Heloisa Nunes Bordallo)
Date: Tue, 01 Apr 2008 17:24:00 +0200
Subject: [neutron-mc] New address
In-Reply-To: <alpine.LRH.1.00.0804011714400.28747@johansen.fys.ku.dk>
References: <alpine.LRH.1.00.0804011714400.28747@johansen.fys.ku.dk>
Message-ID: <47F25390.9030204@hmi.de>

Dear Kim,

Congratulations and all the best!
Heloisa

Kim Lefmann wrote:
> Dear fellow simulators,
> 
> I have accepted a professorship at University of Copenhagen, starting 
> today. Of course, I stay with simulations, and remain as coordinator of 
> MCNSI and the coming FP7 network.
> 
> best,
>       Kim
> 
> 
> _______________________________________________
> neutron-mc mailing list
> neutron-mc at risoe.dk
> http://mailman.risoe.dk/mailman/listinfo/neutron-mc
> 
> 


-- 

Dr. Heloisa Nunes Bordallo <bordallo at hmi.de>
Hahn-Meitner-Institut Berlin - SF6 Glienicker Str., 100
Berlin - D14109 - Germany
Phone : +49 (0)30 8062 2924
Fax +49 (0)30 8062 2781





From wokaoyan1981 at 126.com  Wed Apr 16 15:57:18 2008
From: wokaoyan1981 at 126.com (wokaoyan1981)
Date: Wed, 16 Apr 2008 21:57:18 +0800 (CST)
Subject: [neutron-mc] Monochromator_curved parameter
Message-ID: <22785128.706081208354238187.JavaMail.coremail@bj126app50.126.com>

Dear colleagues,

I'm visualizing the double bent crystal monochromator and here is my problem:

What is the suggested value of r0(Maximum Reflectivity) and t0(Transmission Efficiency) for each crystal plane of Si?(The default is 0.7 and 1.0 respectively.) Or where should I manage to obtain the reflectivity and transmision files for each Si(hkl)?

By the way,congratulations to Professor Kim!

Yours sincerely,
Tom









 
 
 
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From peter.willendrup at risoe.dk  Sun Apr 20 17:33:33 2008
From: peter.willendrup at risoe.dk (Peter Willendrup)
Date: Sun, 20 Apr 2008 17:33:33 +0200
Subject: [neutron-mc] Monochromator_curved parameter
In-Reply-To: <22785128.706081208354238187.JavaMail.coremail@bj126app50.126.com>
References: <22785128.706081208354238187.JavaMail.coremail@bj126app50.126.com>
Message-ID: <B293636E-0FDC-418C-8741-3D80486C3B91@risoe.dk>

Hello Tom,


On Apr 16, 2008, at 3:57 PM, wokaoyan1981 wrote:
> I'm visualizing the double bent crystal monochromator and here is my  
> problem:
>
> What is the suggested value of r0(Maximum Reflectivity) and  
> t0(Transmission Efficiency) for each crystal plane of Si?(The  
> default is 0.7 and 1.0 respectively.) Or where should I manage to  
> obtain the reflectivity and transmision files for each Si(hkl)?

I would suggest you to start out by for example some of these references

Sears et al Acta Cryst. (1997). A53, 35-45 Bragg Reflection in Mosaic  
Crystals. I. General Solution of the Darwin Equations
Sears et al Acta Cryst. (1997). A53, 46-54 Bragg Reflection in Mosaic  
Crystals. H. Neutron Monochromator Properties

Kimura et al NIMA 482 (2002) 799?805 Development of a horizontally and  
vertically focused neutron
monochromator using stacked elastically bent Si single crystals

Or perhaps one of the other McStas users has one or more relevant  
reflectivity profiles to contribute?


Regards,

Peter Willendrup





From peter.willendrup at risoe.dk  Mon Apr 21 13:43:04 2008
From: peter.willendrup at risoe.dk (Peter Willendrup)
Date: Mon, 21 Apr 2008 13:43:04 +0200
Subject: [neutron-mc] Monochromator_curved parameter
In-Reply-To: <B293636E-0FDC-418C-8741-3D80486C3B91@risoe.dk>
References: <22785128.706081208354238187.JavaMail.coremail@bj126app50.126.com>
	<B293636E-0FDC-418C-8741-3D80486C3B91@risoe.dk>
Message-ID: <7A143AB2-6083-4EDF-87C1-B837B088522A@risoe.dk>

Hi everyone,


Forwarding the following information from Lucia Alianelli (Diamond, UK).

Regards,

Peter


-------------------------- From Luica:  
-------------------------------------

Hi Tom,

You can use the NOP package, an extension to XOP.
NOP contains a neutron cross-section database, and tools to calculate
and plot reflectivity from crystals, mirrors etc.

Regards,
Lucia






XOP2.1 webpage:
http://www.esrf.eu/computing/scientific/xop2.1/intro.html

Ftp:
http://ftp.esrf.eu/pub/scisoft/xop2.1/

http://ftp.esrf.eu/pub/scisoft/xop2.1/Windows/Extensions/



On Apr 20, 2008, at 5:33 PM, Peter Willendrup wrote:

> Hello Tom,
>
>
> On Apr 16, 2008, at 3:57 PM, wokaoyan1981 wrote:
>> I'm visualizing the double bent crystal monochromator and here is my
>> problem:
>>
>> What is the suggested value of r0(Maximum Reflectivity) and
>> t0(Transmission Efficiency) for each crystal plane of Si?(The
>> default is 0.7 and 1.0 respectively.) Or where should I manage to
>> obtain the reflectivity and transmision files for each Si(hkl)?
>
> I would suggest you to start out by for example some of these  
> references
>
> Sears et al Acta Cryst. (1997). A53, 35-45 Bragg Reflection in Mosaic
> Crystals. I. General Solution of the Darwin Equations
> Sears et al Acta Cryst. (1997). A53, 46-54 Bragg Reflection in Mosaic
> Crystals. H. Neutron Monochromator Properties
>
> Kimura et al NIMA 482 (2002) 799?805 Development of a horizontally and
> vertically focused neutron
> monochromator using stacked elastically bent Si single crystals
>
> Or perhaps one of the other McStas users has one or more relevant
> reflectivity profiles to contribute?
>
>
> Regards,
>
> Peter Willendrup
>
>
>
> _______________________________________________
> neutron-mc mailing list
> neutron-mc at risoe.dk
> http://mailman.risoe.dk/mailman/listinfo/neutron-mc

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From wokaoyan1981 at 126.com  Thu Apr 24 07:28:28 2008
From: wokaoyan1981 at 126.com (wokaoyan1981 at 126.com)
Date: Thu, 24 Apr 2008 13:28:28 +0800 (CST)
Subject: [neutron-mc] Monochromator_curved parameter
In-Reply-To: <7A143AB2-6083-4EDF-87C1-B837B088522A@risoe.dk>
References: <7A143AB2-6083-4EDF-87C1-B837B088522A@risoe.dk>
	<22785128.706081208354238187.JavaMail.coremail@bj126app50.126.com>
	<B293636E-0FDC-418C-8741-3D80486C3B91@risoe.dk>
Message-ID: <14278066.215491209014908699.JavaMail.coremail@bj126app21.126.com>

Hi all,

XOP 2.11 isn't available on Windows XP Home or Professional . 
Xop2.1beta Edition 
http://ftp.esrf.eu/pub/scisoft/xop2.1/Windows/setup_xop2.1b3.exe
is recommended instead.

Deeply grateful for Peter and Lucia's support.

Sincerely,
Tom




?2008-04-21?"Peter Willendrup" <peter.willendrup at risoe.dk> ???
Hi everyone,




Forwarding the following information from Lucia Alianelli (Diamond, UK).


Regards,


Peter




-------------------------- From Luica: -------------------------------------


Hi Tom,

You can use the NOP package, an extension to XOP.
NOP contains a neutron cross-section database, and tools to calculate
and plot reflectivity from crystals, mirrors etc.

Regards,
Lucia






XOP2.1 webpage:
http://www.esrf.eu/computing/scientific/xop2.1/intro.html

Ftp:
http://ftp.esrf.eu/pub/scisoft/xop2.1/

http://ftp.esrf.eu/pub/scisoft/xop2.1/Windows/Extensions/ 




On Apr 20, 2008, at 5:33 PM, Peter Willendrup wrote:
Hello Tom,


On Apr 16, 2008, at 3:57 PM, wokaoyan1981 wrote:
I'm visualizing the double bent crystal monochromator and here is my  
problem:

What is the suggested value of r0(Maximum Reflectivity) and  
t0(Transmission Efficiency) for each crystal plane of Si?(The  
default is 0.7 and 1.0 respectively.) Or where should I manage to  
obtain the reflectivity and transmision files for each Si(hkl)?

I would suggest you to start out by for example some of these references

Sears et al Acta Cryst. (1997). A53, 35-45 Bragg Reflection in Mosaic  
Crystals. I. General Solution of the Darwin Equations
Sears et al Acta Cryst. (1997). A53, 46-54 Bragg Reflection in Mosaic  
Crystals. H. Neutron Monochromator Properties

Kimura et al NIMA 482 (2002) 799?805 Development of a horizontally and  
vertically focused neutron
monochromator using stacked elastically bent Si single crystals

Or perhaps one of the other McStas users has one or more relevant  
reflectivity profiles to contribute?


Regards,

Peter Willendrup



_______________________________________________
neutron-mc mailing list
neutron-mc at risoe.dk
http://mailman.risoe.dk/mailman/listinfo/neutron-mc


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From wokaoyan1981 at 126.com  Fri Apr 25 07:27:00 2008
From: wokaoyan1981 at 126.com (wokaoyan1981)
Date: Fri, 25 Apr 2008 13:27:00 +0800 (CST)
Subject: [neutron-mc] NOP
Message-ID: <30248475.212831209101220495.JavaMail.coremail@bj126app79.126.com>

Hi all?

I installed XOP2.1beta3 and its extension NOP to obtain reflectivity files required for  perfect Si(311) crystal monochromator in RS visualization. The mission is to take an energy scan within 0.04 and 0.7nm at grazing angle 21.5 degrees.It is a pity that I met some problems.

Here is what I did:
1. Implement the module NCRYSTAL;
2. Set parameters as the Screenshot?please see enclosures;
   (My Email doesn't support image upload.)
3. "Accept" and double click "28Si";
4. "Show" diffraction curve.

In Xplot Window I found nothing. The X coordinate doesn't show desired range.

Please help! I am looking forward your reply.

Yours sincerely,
Tom
 
 
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From wokaoyan1981 at 126.com  Fri Apr 25 07:46:17 2008
From: wokaoyan1981 at 126.com (wokaoyan1981)
Date: Fri, 25 Apr 2008 13:46:17 +0800 (CST)
Subject: [neutron-mc] NOP enclosure  compressed (.rar)
Message-ID: <8077699.224501209102377796.JavaMail.coremail@bj126app79.126.com>

 
Hi all,

For fear of missing the enclosure, I compressed it in rar format.
Hope you will see it.

Yours,
Tom

 
 
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From lucia.alianelli at diamond.ac.uk  Fri Apr 25 14:29:37 2008
From: lucia.alianelli at diamond.ac.uk (Alianelli, L (Lucia))
Date: Fri, 25 Apr 2008 13:29:37 +0100
Subject: [neutron-mc] NOP
In-Reply-To: <30248475.212831209101220495.JavaMail.coremail@bj126app79.126.com>
References: <30248475.212831209101220495.JavaMail.coremail@bj126app79.126.com>
Message-ID: <4854F2500EA8C4478A508D2D92973E52BFB4EE@EXCHANGE25.fed.cclrc.ac.uk>

Hi Tom,
 
it seems that the energy scan type is not optimised in NOP. So I would suggest you look at angular scans, i.e. rocking curves.
 
I attach the rocking curve for lambda = 0.04 nm. The Bragg angle is about 7 degrees, not 21.5. At 21.5 deg you would find zero intensity.
 
Of course you are going to get an error when trying lambda = 0.7 nm or 7 Angstrom. The reason is that the Si 311 d-spacing is 1.64 Angstrom, so you cannot find any Si 311 Bragg reflection for such cold neutrons!!!!
 
Also are you interested in perfect crystal reflectivity? 
Or reflectivity from a mosaic or bent crystal? 
 
Regards,
 
Lucia
 
 
If you want to look at theory, measurements and simulations of neutron reflectivity from crystals, you can look at the bibliography in my thesis:
http://www.esrf.eu/computing/scientific/people/srio/publications/alianelli_thesis.pdf 
 

________________________________

From: neutron-mc-bounces at risoe.dk [mailto:neutron-mc-bounces at risoe.dk] On Behalf Of wokaoyan1981
Sent: 25 April 2008 06:27
To: McStas
Subject: [neutron-mc] NOP


Hi all?

I installed XOP2.1beta3 and its extension NOP to obtain reflectivity files required for  perfect Si(311) crystal monochromator in RS visualization. The mission is to take an energy scan within 0.04 and 0.7nm at grazing angle 21.5 degrees.It is a pity that I met some problems.

Here is what I did:
1. Implement the module NCRYSTAL;
2. Set parameters as the Screenshot?please see enclosures;
   (My Email doesn't support image upload.)
3. "Accept" and double click "28Si";
4. "Show" diffraction curve.

In Xplot Window I found nothing. The X coordinate doesn't show desired range.

Please help! I am looking forward your reply.

Yours sincerely,
Tom 
 
 
 


________________________________

????????2008????? <http://popme.163.com/link/004290_0422_5595.html> 
<DIV><FONT size="1" color="gray">This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail.
Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. 
Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message.
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</FONT></DIV> 
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From wokaoyan1981 at 126.com  Tue Apr 29 16:30:55 2008
From: wokaoyan1981 at 126.com (wokaoyan1981 at 126.com)
Date: Tue, 29 Apr 2008 22:30:55 +0800 (CST)
Subject: [neutron-mc] NOP
In-Reply-To: <4854F2500EA8C4478A508D2D92973E52BFB4EE@EXCHANGE25.fed.cclrc.ac.uk>
References: <4854F2500EA8C4478A508D2D92973E52BFB4EE@EXCHANGE25.fed.cclrc.ac.uk>
	<30248475.212831209101220495.JavaMail.coremail@bj126app79.126.com>
Message-ID: <2990240.4821209479455906.JavaMail.coremail@bj126app90.126.com>

Hello Lucia,

Thank you very much for your reply! I understand the unexpected output 
when you shed light on it.
Now I take an angular scan as you suggest, here is part of the result:
( Si 311, 
  TDS=0, 
  Debye Waller factor=-288,
  Linear cell expasion=1, 
  Mosaic Crystal=No,
  Geo=BRAGG diffr beam, 
  Scan type=Theta(absolute),
  Energy/Wavelenghth unit=Wavelenggh(angstrom), 
  Angular Unit=Degrees, 
  Fixed value=1.2, 
  Min scan Value=20,
  Max scan Value=25, 
  Scan Points=1000, 
  Asymetry angle=0, 
  Crystal thickness=0.6999)
              ...
      21.4911 6.11795e-006
      21.4916 7.52919e-006
      21.4921  0.000120346
      21.4926  0.000303971
      21.4931 6.50051e-005
      21.4936  0.000526068
      21.4941 5.63596e-006
      21.4946  0.000368681
      21.4951   0.00645020
      21.4956    0.0147543
      21.4961  0.000430623
      21.4967  0.000171211
      21.4972   0.00121510
      21.4977  0.000588131
      21.4981  0.000492101
      21.4986  0.000255239
      21.4991 2.99586e-005
      21.4996 1.94318e-005
      21.5002 9.97257e-005
      21.5007  0.000119835
      21.5012 8.19391e-005
      21.5016 3.93121e-005
      21.5021 1.48155e-005

            ...
And I see the Bragg peak near 21.5 degree.
My question is: Then how should I get reflectivity file from the data above?Integral or something else? Actually, I don't clearly understand the reflectivity file required.

Yours sincerely,
Tom


?2008-04-25?"Alianelli L (Lucia)" <lucia.alianelli at diamond.ac.uk> ???

Hi Tom,
 
it seems that the energy scan type is not optimised in NOP. So I would suggest you look at angular scans, i.e. rocking curves.
 
I attach the rocking curve for lambda = 0.04 nm. The Bragg angle is about 7 degrees, not 21.5. At 21.5 deg you would find zero intensity.
 
Of course you are going to get an error when trying lambda = 0.7 nm or 7 Angstrom. The reason is that the Si 311 d-spacing is 1.64 Angstrom, so you cannot find any Si 311 Bragg reflection for such cold neutrons!!!!
 
Also are you interested in perfect crystal reflectivity? 
Or reflectivity from a mosaic or bent crystal? 
 
Regards,
 
Lucia
 
 
If you want to look at theory, measurements and simulations of neutron reflectivity from crystals, you can look at the bibliography in my thesis:
http://www.esrf.eu/computing/scientific/people/srio/publications/alianelli_thesis.pdf 
 



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From peter.willendrup at risoe.dk  Thu May  8 11:45:49 2008
From: peter.willendrup at risoe.dk (Peter Willendrup)
Date: Thu, 08 May 2008 11:45:49 +0200
Subject: [neutron-mc] McStas 1.12 release
Message-ID: <E30E01AF-61A4-485E-974E-518EB7EAF3DA@risoe.dk>

Hello everyone,


The McStas developer team is happy to report that the 1.12 release of
our software is finally out.

You can get the installer package from http://www.mcstas.org/download

Among other things, the new release includes

* A new %include INSTR keyword for inclusion of instruments in  
instruments
* Many useful new features in mcgui
* Support for recent releases of Windows and Mac OS
* New components and example instruments
* Several improvements related to parallelisation

-  and many other useful new things.

For a complete list of changes, see

http://www.mcstas.org/download/src/CHANGES


Best regards from

The McStas team:

Peter Willendrup   (Ris? DTU)
Erik Knudsen (Ris? DTU)
Emmanuel Farhi     (ILL)
Kim Lefmann        (NBI, Uni Copenhagen)


Ps: Two of us will be available at the ACNS conference from may 11th, we
encourage you see us there for software demos!

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From percival at physics.queensu.ca  Tue Jun  3 03:56:11 2008
From: percival at physics.queensu.ca (Aaron M. Percival)
Date: Mon, 02 Jun 2008 21:56:11 -0400
Subject: [neutron-mc] Statistical Errors question:
Message-ID: <816e49cc0806021856u3dd6facds2a8357fa81115b9a@mail.gmail.com>

Hi all,

In section 4.2.1 of the McStas user manual makes the following statement:

"...we observe a large number of neutrons, N >= 10. Then N almost follows a
> normal distribution with the uncertainty sigma(N) = sqrt(N')."
>

Here N is the number of neutron counts in a particular bin of a monitor.

I was wondering why mathematically this is true.  Is it an application of
the Central Limit Theorem?

Any insight is appreciated,

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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From peter.willendrup at risoe.dk  Tue Jun  3 09:23:03 2008
From: peter.willendrup at risoe.dk (Peter Willendrup)
Date: Tue, 03 Jun 2008 09:23:03 +0200
Subject: [neutron-mc] =?iso-8859-1?q?Two_vacant_positions_at_RIS=D8_DTU?=
Message-ID: <B24FF97E-C026-47E8-8E25-5E37F23A9F2C@risoe.dk>

( From http://www.dtu.dk/English/About_DTU/vacancies.aspx? 
guid=22612341 )
( Online application form available at http://dtuukhr.c.ofir.com/Job/CV/jobapplication_edit.asp 
  )


Two Scientists/Senior scientists

Two scientists or senior scientists to strengthen neutron scattering  
activities in basic and applied materials research.
Apply before: 30.06.2008 at 12:00 (noon)

Two Senior Scientists/Scientists position for neutron scattering  
studies of materials for the energy sector

The Materials Research Department (AFM) at Ris? DTU, National  
Laboratory for Sustainable Energy, Technical University of Denmark is  
seeking two Scientists or Senior Scientists to strengthen neutron  
scattering activities in basic and applied materials research. Ris?  
DTU has a long tradition in structural physics and materials science  
using neutron and synchrotron X-ray scattering techniques. We have  
currently obtained a contract with the Paul Scherrer Institute in  
Switzerland giving priority access to the RITA-II spectrometer that  
has been developed at Ris? DTU but is now stationed at the SINQ  
neutron source.

AFM has strong collaborations with leading Danish and international  
universities and large scale research centers, including a number  
synchrotron x-ray facilities in Europe and USA. A special competence  
is the Worlds leading program McStas for simulations of neutron  
spectrometers, developed and maintained at Ris?.

Job description
The chosen candidates are expected to use neutron scattering but also  
synchrotron X-ray diffraction as primary experimental techniques,  
which require significant travel activities to international large  
scale research facilities. They will have as colleagues scientists and  
technicians working on materials properties that are relevant for the  
energy sector, such as: superconductivity, magnetism, hydrogen storage  
and thermoelectrics. Depending on experience the candidates should  
contribute to the following activities:

    * development and use of neutron and synchrotron x-ray scattering  
facilities in materials science
    * collaboration on neutron instrument simulation and testing
    * development of advanced auxiliary equipment
    * participation in the Department?s research programs
    * establish own research projects within the Ris? DTU strategy on  
energy materials
    * training and assisting new users
    * project management and fundraising
    * teaching and supervision of students and post docs

Qualifications

    * education as a physicist, materials scientists or chemist
    * Ph.D. degree, or similar qualifications, followed by post  
doctoral and research experience
    * demonstrated experience in neutron and/or synchrotron x-ray  
scattering techniques
    * documented experience in materials science and physics related  
to the Department activities
    * ability to work independently and within research groups
    * experience in supervision and project management
    * good communication skills in oral and written English

We offer
We offer an exciting and challenging job in an international  
environment with good possibilities for professional and personnel  
growth. Ris? DTU is a family friendly organization with flexible  
working hours

Terms of employment
You will be employed in accordance with the terms valid for academic  
staff at universities. Salary will depend on qualifications and  
experience.

Application
We must have your online application by 30 June 2008. Please open the  
link "apply online" and fill in the application form and attach your  
application and CV.

Ris? DTU requires variety and supports equal opportunities  
irrespective of sex and ethnic background

Further information
You are welcome to contact Niels Hessel Andersen, +45 4677 4711, or  
Allan Schr?der Pedersen, +45 4677 5705.






From peter.willendrup at risoe.dk  Tue Jun  3 13:54:07 2008
From: peter.willendrup at risoe.dk (Peter Willendrup)
Date: Tue, 03 Jun 2008 13:54:07 +0200
Subject: [neutron-mc] Statistical Errors question:
In-Reply-To: <816e49cc0806021856u3dd6facds2a8357fa81115b9a@mail.gmail.com>
References: <816e49cc0806021856u3dd6facds2a8357fa81115b9a@mail.gmail.com>
Message-ID: <59E759E4-6F5C-45D2-AC24-624AA6F83241@risoe.dk>

Hello Aaron,

On Jun 3, 2008, at 3:56 AM, Aaron M. Percival wrote:

> In section 4.2.1 of the McStas user manual makes the following  
> statement:
>
> "...we observe a large number of neutrons, N >= 10. Then N almost  
> follows a normal distribution with the uncertainty sigma(N) =  
> sqrt(N')."
>
> Here N is the number of neutron counts in a particular bin of a  
> monitor.
>
> I was wondering why mathematically this is true.  Is it an  
> application of the Central Limit Theorem?

Probably true. In case you want a more formal proof of this, see for  
instance Byron P. Roe "Probability and Statistics in Experimental  
Physics",
  ISBN 0-387-97849-6, Springer Verlag, pp. 35-37. (Or likely any other  
standard book on the topic.)

Cheers,

Peter





From peter.willendrup at risoe.dk  Wed Jun  4 10:53:48 2008
From: peter.willendrup at risoe.dk (Peter Willendrup)
Date: Wed, 04 Jun 2008 10:53:48 +0200
Subject: [neutron-mc] =?windows-1252?q?Re=3A_Two_vacant_positions_at_RIS?=
	=?windows-1252?q?=D8_DTU?=
In-Reply-To: <B24FF97E-C026-47E8-8E25-5E37F23A9F2C@risoe.dk>
References: <B24FF97E-C026-47E8-8E25-5E37F23A9F2C@risoe.dk>
Message-ID: <E6DB6D23-67B3-48DE-B5EA-3FAE8BC63520@risoe.dk>

The link to the online form was broken, sorry about that. This one  
works:

http://dtuukhr.c.ofir.com/Job/CV/jobapplication_attachchoice.asp?instance_id=22612341

Regards,

Peter Willendrup

On Jun 3, 2008, at 9:23 AM, Peter Willendrup wrote:

> ( From http://www.dtu.dk/English/About_DTU/vacancies.aspx?guid=22612341 
>  )
> ( Online application form available at http://dtuukhr.c.ofir.com/Job/CV/jobapplication_edit.asp 
>  )
>
>
> Two Scientists/Senior scientists
>
> Two scientists or senior scientists to strengthen neutron scattering  
> activities in basic and applied materials research.
> Apply before: 30.06.2008 at 12:00 (noon)
>
> Two Senior Scientists/Scientists position for neutron scattering  
> studies of materials for the energy sector
>
> The Materials Research Department (AFM) at Ris? DTU, National  
> Laboratory for Sustainable Energy, Technical University of Denmark  
> is seeking two Scientists or Senior Scientists to strengthen neutron  
> scattering activities in basic and applied materials research. Ris?  
> DTU has a long tradition in structural physics and materials science  
> using neutron and synchrotron X-ray scattering techniques. We have  
> currently obtained a contract with the Paul Scherrer Institute in  
> Switzerland giving priority access to the RITA-II spectrometer that  
> has been developed at Ris? DTU but is now stationed at the SINQ  
> neutron source.
>
> AFM has strong collaborations with leading Danish and international  
> universities and large scale research centers, including a number  
> synchrotron x-ray facilities in Europe and USA. A special competence  
> is the Worlds leading program McStas for simulations of neutron  
> spectrometers, developed and maintained at Ris?.
>
> Job description
> The chosen candidates are expected to use neutron scattering but  
> also synchrotron X-ray diffraction as primary experimental  
> techniques, which require significant travel activities to  
> international large scale research facilities. They will have as  
> colleagues scientists and technicians working on materials  
> properties that are relevant for the energy sector, such as:  
> superconductivity, magnetism, hydrogen storage and thermoelectrics.  
> Depending on experience the candidates should contribute to the  
> following activities:
>
>   * development and use of neutron and synchrotron x-ray scattering  
> facilities in materials science
>   * collaboration on neutron instrument simulation and testing
>   * development of advanced auxiliary equipment
>   * participation in the Department?s research programs
>   * establish own research projects within the Ris? DTU strategy on  
> energy materials
>   * training and assisting new users
>   * project management and fundraising
>   * teaching and supervision of students and post docs
>
> Qualifications
>
>   * education as a physicist, materials scientists or chemist
>   * Ph.D. degree, or similar qualifications, followed by post  
> doctoral and research experience
>   * demonstrated experience in neutron and/or synchrotron x-ray  
> scattering techniques
>   * documented experience in materials science and physics related  
> to the Department activities
>   * ability to work independently and within research groups
>   * experience in supervision and project management
>   * good communication skills in oral and written English
>
> We offer
> We offer an exciting and challenging job in an international  
> environment with good possibilities for professional and personnel  
> growth. Ris? DTU is a family friendly organization with flexible  
> working hours
>
> Terms of employment
> You will be employed in accordance with the terms valid for academic  
> staff at universities. Salary will depend on qualifications and  
> experience.
>
> Application
> We must have your online application by 30 June 2008. Please open  
> the link "apply online" and fill in the application form and attach  
> your application and CV.
>
> Ris? DTU requires variety and supports equal opportunities  
> irrespective of sex and ethnic background
>
> Further information
> You are welcome to contact Niels Hessel Andersen, +45 4677 4711, or  
> Allan Schr?der Pedersen, +45 4677 5705.
>






From peter.willendrup at risoe.dk  Thu Jun 12 12:05:41 2008
From: peter.willendrup at risoe.dk (Peter Willendrup)
Date: Thu, 12 Jun 2008 12:05:41 +0200
Subject: [mcstas-users] New mailinglist email adress
Message-ID: <3DB7857B-AF03-4881-BBE7-3338FE0D56A1@risoe.dk>

Hello everyone,


The McStas users list (formerly know as neutron-mc at risoe.dk) has moved  
to new hardware and has been
given a new name:

mcstas-users at mcstas.org

The McStas support email adress (formerly known as mcstas at risoe.dk)  
has also been given a new name:

mcstas-support at mcstas.org


Regards,

Peter Willendrup

_______________________________________________
mcstas-users mailing list
mcstas-users at mcstas.org
http://eagle.zigzak.net/cgi-bin/mailman/listinfo/mcstas-users




From peter.willendrup at risoe.dk  Mon Jun 30 14:17:50 2008
From: peter.willendrup at risoe.dk (Peter Willendrup)
Date: Mon, 30 Jun 2008 14:17:50 +0200
Subject: [mcstas-users] Elastically bent perfect crystal mono
In-Reply-To: <9389.70203.qm@web92102.mail.cnh.yahoo.com>
References: <9389.70203.qm@web92102.mail.cnh.yahoo.com>
Message-ID: <4BCF7BD0-EABB-4B2F-8048-8F8083A2A0D3@risoe.dk>

Hello,


On Jun 21, 2008, at 10:57 AM, Chuang Lee wrote:

> I want to simulate elastically bent perfect crysta l(BPC)  
> monochromator although only the mosaic mono" monochromator courved"  
> is available.
>
> Should I try to calculate the equivalent mosaic of BPC as input  
> parameter of  "monochromator courved" for simulation?

Unfortunately, we currently have no model of an elastically bent  
perfect crystal. (Our current monochromator models have constant  
strain and
d-spacing and no means of variation of these as function of a given  
shape.)

Several users have expressed interest in such a component, so likely  
it will be implemented in the future.

Possibly, you could write a code like that yourself, with one of the  
existing monochromators as a starting point. Should you decide
to do so, we will be happy to include such a component as a  
contribution to our package.


Best regards,

Peter Willendrup

_______________________________________________
mcstas-users mailing list
mcstas-users at mcstas.org
http://mailman.mcstas.org/cgi-bin/mailman/listinfo/mcstas-users