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SwissNeutronics SwissNeutronics Neutron Optical Components & Instruments www.swissneutronics.ch Page 1 SwissNeutronics SwissNeutronics Neutron Optical Components & Instruments Bruehlstrasse 28 CH5313 Klingnau Switzerland phone: +41 (56) 245 02 02 fax: +41 (56) 245 02 04 [email protected] www.swissneutronics.ch Newsletter issue 4 / december 2009 ... » Supermirror m = 7 – the VISION becomes reality Supermirror m = 7 – the VISION becomes reality The beamline VISION at the Spallation Neutron Source SNS in Oak Ridge, USA, utilizes a converging neutron guide to transport neutrons with ener- gies as high as 200 meV from the mod- erator to the sample. The initial speci- ÄJH[PVU PU[LUKLK [OH[ [OL JVTWSL[L guide was coated with supermirror m = 4. However, SwissNeutronics pro- posed extending the m-values up to m = 6 to push the performance of the instrument further. The VISION team became encouraged by the recent developments at SwissNeutronics (e.g. see http://www.swissneutronics. ch/news/news-september-2008.html) and decided to take advantage of this opportunity and to upgrade the guide with higher m-values. Soon the ques- tion for the highest possible m arose. :^PZZ5L\[YVUPJZ ^HZ JVUÄKLU[ [V NV one step further, from m =6 (done in 2006) to m = 7. Thus the VISION team decided to apply m-values 4, 5, 6, and 7 for distinct sections from the mod- erator to the sample. SwissNeutronics performed the coatings in that sequence. Right for m = 4 and 5 excellent results were achieved repro- K\JPUN [OL YLÅLJ[P]P[` MYVT YLJLU[ WYVQ- ects. An m = 6 mirror was coated only once before in the year 2006. Already at that time a quite impressive perfor- mance was achieved but we were cu- rious to see the impact of the devel- opments over the intervening years. In page 1 Fig. 1! 9LÅLJ[P]P[` KH[H MVY Z\WLYTPYYVY ^P[O m $ HUK LZ[HISPZOPUN H UL^ ILUJOTHYR PU [OL OPZ[VY` VM Z\WLYTPYYVY 0.11 0.22 0.33 0.43 0.54 0.65 0.76 0.87 0.98 1.09 1.19 1.30 1.41 1.52 1.63 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 Q z [nm -1 ] Reflectivity 0.0 0.1 0.2 0.3 0.4 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 R m - value m = 4 m = 5 m = 6 m = 7 ... » NIST In-Pile Guide: First Neutron Guide Made from Superpolished Aluminum Substrates page 2 ... » 10 Years SwissNeutronics – A Short Historical Account page 4

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  • Swiss N eutronics SwissNeutronicsNeutron  Optical  Components  

    &  Instruments    

    www.swissneutronics.ch

    Page  1Swiss N eutronics Swiss N eutronics Neutron  Optical  Components&  Instruments Bruehlstrasse  28CH-5313  KlingnauSwitzerland

    phone:  +41  (56)  245  02  02

    fax:  +41  (56)  245  02  04

    [email protected]

    Newsletter

    issue  4  /  december  2009

    ...» Supermirror  m  =  7  –  the  VISION  becomes  reality

    Supermirror  m  =  7  –  the  VISION  becomes  realityThe   beamline   VISION   at   the   Spallation  Neutron   Source   SNS   in   Oak   Ridge,  USA,   utilizes   a   converging   neutron  guide  to  transport  neutrons  with  ener-gies  as  high  as  200  meV  from  the  mod-erator  to  the  sample.  The  initial  speci-

    guide   was   coated   with   supermirror    m  =  4.  However,  SwissNeutronics  pro-posed   extending   the   m-values   up   to  m  =  6  to  push  the  performance  of  the  instrument   further.   The   VISION   team  became   encouraged   by   the   recent  developments   at   SwissNeutronics    (e.g.   see   http://www.swissneutronics.ch/news/news-september-2008.html)  and  decided  to  take  advantage  of  this  opportunity  and  to  upgrade  the  guide  with  higher  m-values.  Soon   the  ques-tion   for   the  highest  possible  m   arose.  

    one  step   further,   from  m  =  6   (done   in  2006)  to  m  =  7.  Thus  the  VISION  team  decided  to  apply  m-values  4,  5,  6,  and  7   for   distinct   sections   from   the  mod-erator  to  the  sample.

    SwissNeutronics  performed  the  coatings  in  that  sequence.  Right  for  m  =  4  and  5  excellent  results  were  achieved  repro-

    -ects.  An  m  =  6  mirror  was  coated  only  

    once  before  in  the  year  2006.  Already  at  that  time  a  quite  impressive  perfor-mance  was  achieved  but  we  were  cu-rious   to   see   the   impact   of   the   devel-opments  over  the  intervening  years.  In  

    page  1

    Fig.  1 m

    0.11 0.22 0.33 0.43 0.54 0.65 0.76 0.87 0.98 1.09 1.19 1.30 1.41 1.52 1.63

    0.4

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    0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5

    Re

    fle

    cti

    vit

    y

    m - value

    m = 4 m = 5

    m = 6 m = 7

    ...» NIST  In-Pile  Guide:  First  Neutron  Guide  Made  from  Superpolished  Aluminum  

    Substrates

    page  2

    ...» 10  Years  SwissNeutronics  –  A  Short  Historical  Account

    page  4

    mailto:[email protected]://www.swissneutronics.chhttp://www.swissneutronics.ch/news/news-september-2008.htmlhttp://www.swissneutronics.ch/news/news-september-2008.html

  • ...for  more  info  visit  our  website  at  http://www.swissneutronics.ch

    Page  2Swiss N eutronics Swiss N eutronics Neutron  Optical  Components&  Instruments Bruehlstrasse  28CH-5313  KlingnauSwitzerland

    phone:  +41  (56)  245  02  02

    fax:  +41  (56)  245  02  04

    [email protected]

    issue  4  /  december  2009

    Newsletter

    -ity  massively  to  Redge  m  =  6  of  the  supermirror.  Finally,  

    with  m  =  7.  After  several  days  of  sput-

    were  more  than  excited  to  see  that  we  R

    at  the  critical  edge.

    Despite  achieving

    stability   of   the  mirrors   is   of   basic   im-portance.   Therefore,   all   coatings   are  developed  to  have  a  minimum  internal  stress.   We   monitored   the   stress   also  during  the  sputtering  campaign  for  VI-

    m  =  6  mirror   from   the  year   2006   served   as   a   reference.  We  have  that  mirror  stored  on  our  shelf  and  inspected  it  frequently.  There  is  abso-lutely   no   degradation   in   terms   of   re-

    low  to  guarantee  long  term  stability.  All  -

    ect  have  an  internal  stress  well  below  that  of  the  reference  mirror.

    σσ σσ

    Fig.  2m

    m

    In  conclusion,  SwissNeutronics  is  proud  -

    mark   in   the   history   of   supermirror.  Within   the   campaign   for   the   VISION  

    and   challenging   m   values   were   suc-cessfully   produced   constituting   a   su-permirror  “Grand  Slam”.

    NIST  In-Pile  Guide:  First  Neutron  Guide  Made  from    Superpolished  Aluminum  SubstratesIn  our  previous  newsletter  (issue  3)  we  re-ported  about   the   spectacular   neutron  guide   assemblies   for   the   initial   sec-tion  of   the  new  neutron  guide  system  at   the  NCNR  at   the  National   Institute  for  Standards  and  Technology   (NIST).  

    made   from   superpolished   borkron  glass.  In  front  of  them,  the  NCNR  de-sires  to  install  another  guide  assembly  as  close  as  possible  to  the  moderator  to  improve  the  illumination  of  the  neu-tron   guides.   This   guide   is   located   in  

    from   the  moderator.  Since   this   region  

    radiation  load,  it  is  desired  to  fabricate  it  from  aluminum  substrates.

    The   contract   was   awarded   to   Swiss-Neutronics   because   we   are   the   only  

    the   subsequent   neutron   guides.   Fig.  3   shows   the   3D  model   of   the   in-pile  guide  assembly.  Afterwards   the   fabri-cation  of  the  aluminum  substrates  was  performed  including  the  sophisticated  superpolishing.   The   roughness   of   the  substrates  was  measured  using  atom-ic  force  microscopy  (AFM) -ment   of   the   surface   was   complete  when  the  AFM  results  showed  a  rough-

    or  superpolished  glass.  After  the  coat-ing  all  parts  were  tested  measuring  the  

    Fig.  4  depicts  a  few  representative  results,  e.g.  supermirror  on  superpolished  aluminum  achieving  

    R  =  0.80  at  the  critical  edge  of  m  =  3.6.  Finally,  the  guide  was  assembled,  i.e.  screwed  together,   which   is   a   rather   unfamiliar  wording  for  the  assembly  process  of  a  

    company   which   can   produce   super-polished  surfaces  on  aluminum  for  the  application  of  neutron  supermirror  with  

    m   val-ues.  The  engineering  design  started  in  spring  2009.  A  complex  geometry  and  various  mrequired  to  match  the  phase  space  of  

    stability  against  irradiation  and  ther-     mal  load

    mechanical  robustness

    extended  machining  options  for  inte-     grated  mounting  and  assembly  fea-     tures

    reversible  assembly  -  individual  parts       can  be  replaced

    http://www.swissneutronics.chhttp://www.swissneutronics.ch/fileadmin/download/snag_newsletter_2009-october.pdf

  • ...for  more  info  visit  our  website  at  http://www.swissneutronics.ch

    Page  3Swiss N eutronics Swiss N eutronics Neutron  Optical  Components&  Instruments Bruehlstrasse  28CH-5313  KlingnauSwitzerland

    phone:  +41  (56)  245  02  02

    fax:  +41  (56)  245  02  04

    [email protected]

    issue  4  /  december  2009

    Newsletter

    neutron  guide.  Usually  we  glue  guide  units   together.   However,   we   may   get  used  to  the  process  of  screwing  in  the  future.  The  assembled  guide  is  shown  in  Fig.  5of  neutron  guides  made   from  metallic  substrates  is  given  in  the  separate  info    box.

    Finally  we  delivered  this  unique  neutron  guide  to  NIST  in  early  December  2009,  about  two  months  earlier  compared  to  the   contractual   obligation.   This   suc-cessful  collaboration  with  NIST  proves  the   capabilities   of   SwissNeutronics  to   fabricate   neutron   guides   from   alu-minium  substrates  providing  extended  options   for   neutron   optics   with   great  

    0.11 0.22 0.33 0.43 0.54 0.65 0.76 0.87 0.98

    0.4

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    File: Reflectivity

    Date of file: 12/17/2009

    0.0

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    0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

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    m - value

    m = 1.8 m = 2.5

    m = 3 m = 3.6

    Fig.  3

     

    m

    Fig.  5

    Fig.  4

    m

    http://www.swissneutronics.ch

  • ...for  more  info  visit  our  website  at  http://www.swissneutronics.ch

    Page  4Swiss N eutronics Swiss N eutronics Neutron  Optical  Components&  Instruments Bruehlstrasse  28CH-5313  KlingnauSwitzerland

    phone:  +41  (56)  245  02  02

    fax:  +41  (56)  245  02  04

    [email protected]

    issue  4  /  december  2009

    Newsletter

    10  Years  SwissNeutronics  –  A  Short  Historical  Account

    It  was  during  the  course  of  a  coffee  break  at   the   Paul   Scherrer   Institute   (PSI)   in  

    -ing  a  company,  dedicated  to  the  fabri-cation  of  neutron  optical  components  was  born.  In  those  good  old  days,  we  (three   physicists   and   two   engineers)  were   concerned   (Fig.   6)   because   the  

    -

    lays   in  upgrading  beam   lines   for  neu--

    cient  neutron  optics  using  supermirror  and   advanced   mechanical   compo-nents.   These   delays   were   particularly  frustrating  because  the  Laboratory  for  Neutron  Scattering  PSI  &  ETH  had  ex-cellent  coating  facilities  for  the  produc-tion   of   supermirror   with   large   critical  

    was  the  notion  that  the  ratio  Q  =     divided   by    became  one  of   the  measures  

    for   the   performance   of   large-scale    facilities.  The  smaller  Q  the  higher  the  ranking  of  the  facility,  i.e.  the  goal  was  

    way   to   achieve   this   ambitious  goal   is  to   outsource   technical   developments  thus  saving  manpower  and  buying  the  goods   from   the   outsourced   company  in   order   to   increase   the   investments.  Therefore,  it  was  timely  to  take  advan-tage  of  this  situation  and  combine  the  expertise   of   scientists   and   engineers  being   strongly   involved   in   neutron  scattering  to  develop  modern  neutron  optical   components   for   a   large   com-munity  thus  speeding  up  the  upgrade  of  existing  neutron  sources.

    After   the   decision   to   found   SwissNeu-tronics  as  a  spin-off  company  of  PSI,  it   took   only   three   weeks   to   perform  the   paper   work   for   legalizing   Swiss-

    SwissNeutronics   embarqued   on   the  fabrication  of  remanent  polarizing  and  non-polarizing   supermirror   coatings  for  various  customers.  It  was  in  spring  2000,  when  SwissNeutronics  expand-

    ed   its  activities  massively   for   the  pro-duction   of   more   than   200   meters   of  neutron   guides   for   the   new   neutron  source  FRM   II   in  Munich.  For   the  as-sembly  of  the  neutron  guides,  dedicat-ed  equipment  and  facilities  were  rent-ed  at  “Oberes  Zelgli”  in  Klingnau.  The  glass   substrates   were   delivered   by   a  company  in  Switzerland  that  was  well  known  for  the  production  of  optics  for  industry.   It  was  during  this   time  when  the   new   concept   for   neutron   guides  was   introduced   by   SwissNeutron-ics,   i.e.   a  design  where   the  geometry  

    dimensions  of   the  substrates  and  not  by  the  glue  thus  guaranteeing  the  long  

    term  stability  of  the  neutron  guides  as  manufactured   by   SwissNeutronics.   In  order   to   improve   the   precision   of   the  single  substrates  to  a  quality  superior  to  that  available  from  the  optics  indus-try,  SwissNeutronics  acquired   its  own  

    installed  it  in  its  second  facility  at  Bad-strasse  in  Döttingen.

    Fig.  6

    Fig.  7

    http://www.swissneutronics.ch

  • ...for  more  info  visit  our  website  at  http://www.swissneutronics.ch

    Page  5Swiss N eutronics Swiss N eutronics Neutron  Optical  Components&  Instruments Bruehlstrasse  28CH-5313  KlingnauSwitzerland

    phone:  +41  (56)  245  02  02

    fax:  +41  (56)  245  02  04

    [email protected]

    issue  4  /  december  2009

    Newsletter

    Actually,  because  of  a   lack  of  facilities  

    the   guides   for   the   shutter   section   of  FRM   II   (Fig.   7)   in   a   garage   (Fig.   8)   of  one  of   the   founders.  Clearly   a   typical  procedure  when  a  new  company  starts  

    its  activities.  Following  the  large  guide  

    expanded   its   activities   very   quickly,  

    distributed   by   AVANCE   Inc.,   followed  by   the   manufacturing   of   the   neutron  guide   for   ENGINE-X   at   ISIS.   Finally  most   neutron   scattering   centers   be-came  customers  of  SwissNeutronics.

    With   the   increasing   number

    SwissNeutronics   decided   to   optimize  its  manufacturing   processes   by  mov-ing   to   its   own   fabrication   building   at  Bruehlstrasse  28  in  Klingnau  in  Spring  2004,   where   all   the   activities   were  combined   (Fig.   9)   thus   facilitating   fu-ture   expansions.   In   the   same   year,   a  magnetron   sputtering   facility   and   a  second  CNC  grinding  machine  of   the  newest   generation   was   acquired   to  enable  for  the  precise  grinding  of  non-linearly   tapered   neutron   guides   more  effectively.  The  year  2005  marked  two  important  steps  in  the  development  of  SwissNeutronics.   Firstly,   a   scientist,  i.e.   an   expert   in   neutron   optics,   who  was  formerly  responsible  for  the  instal-lation  and  quality  management  of   the  neutron   guide   installations   at   FRM   II,  

    the   responsibility   for   the   supermirror  

    coatings   and   the   technical   develop-

    2007,  in  his  new  position  as  chief  oper--

    ration  with   the  whole   team   of   Swiss-

    management  system,  which  has  led  to  

    the  resources  of  SwissNeutronics  and  virtually  eliminated  time  delays  during  production.   Secondly,   SwissNeutron-ics  obtained  access  to  its  own  neutron  

    -mirror  coatings  immediately  after  pro-duction.  All  these  measures  have  led  to  a  marked  increase  of  the  performance  

    of  supermirror   for  polarizing  and  non-polarizing   applications.   In   particular,  SwissNeutronics   succeeded   to   intro-duce  the  m  =  6   technology   for  super-mirror  as  a  standard  process.  The  larg-est  critical  angles  now  exceed  m  =  7.

    The  last  years -velopments   and  breakthroughs   in   the  

    -

    neutron   guide   with   a   length   of   90   m  was  installed  timely  for  the  High  Reso-lution  Powder  Diffractometer  HRPD  at  the  spallation  source  ISIS  in  UK  (News-

    .  Its  performance  is   excellent.   In   2007,   a   laser   tracker  was  acquired  that  provides  higher  ac-curacy   and   extended   options   com-pared  to  conventional  instruments  for  guide  alignment,  e.g.  it  allows  a  swift  and  highly  accurate  alignment  of  non-linearly   tapered   neutron   guides   and  beam   inserts   in   high   radiation   areas.  For   various   laboratories,   elliptic   and  parabolic   focusing   devices   were   de-livered,  which  rely  on  supermirror  with  mwas   increased   rather  dramatically   for  polarizing  supermirror  made  from  Fe/Si   exceeding   now   critical   angles   of  

    m   =   4.5.   Moreover,   Swiss-

    Neutronics   succeeded   to   also   pro-vide   polarizing   and   non-polarizing  monochromating  systems   for  various  neutron   sources   using   an   advanced  technology   (Newsletter   2,   December  2008).  We  mention   in  particular   large  Heusler   systems,   where   SwissNeu-

    -ing   to  a  polarization  of   the  diffracted  neutrons  P  >  94%  and  a  variable   fo-cusing  monochromator  system  based  

    Fig.  9

    Fig.  8

    http://www.swissneutronics.chhttp://www.swissneutronics.ch/fileadmin/download/snag_newsletter_2008-august.pdfhttp://www.swissneutronics.ch/fileadmin/download/snag_newsletter_2008-august.pdf

  • ...for  more  info  visit  our  website  at  http://www.swissneutronics.ch

    Page  6Swiss N eutronics Swiss N eutronics Neutron  Optical  Components&  Instruments Bruehlstrasse  28CH-5313  KlingnauSwitzerland

    phone:  +41  (56)  245  02  02

    fax:  +41  (56)  245  02  04

    [email protected]

    issue  4  /  december  2009

    Newsletter

    breakthrough   we   mention   the   abil-ity   of   SwissNeutronics   to   superpolish  substrates   manufactured   from   alumi-num  and  steel  with  unprecedented  low  roughness  at  its  own  facilities  yielding  

    with  min  neutron  optics  and  will  have  a  sig-

    neutron  guides.

    In   summary,   SwissNeutronics   with   its  

    very  proud  to  have  become  one  of  the  

    During  this  time,  SwissNeutronics  has  improved   the  mechanical   design,   the  performance   of   the   supermirror,   and  the   reliability   of   the   neutron   optical  

    had   not   been   possible   under   regular  research   conditions   at   a   large   scale  facility.   In   particular,   SwissNeutronics  has   invented   and   pushed   many   new  developments   in   neutron   optics   that  have   improved   the   performance   of  

    more   neutrons   per   dollar.   Of   course,  the  rather  dramatic  progress  was  only  made   possible   by   the   excellent   work  

    Fig.  10of  our  well-trained  personnel    that  is  uniquely  available  in  Switzerland  and  the  collaboration  of  physicists  and  engineers,  who  are  directly  involved  in  neutron  physics  and   in   the   realization  

    -ward   to  many  more   successful   years  of   operation   and   hope   to   continue   in  improving  our  products  to  service  our  customers.

    http://www.swissneutronics.ch