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     Optic - Soft branch

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    Click on rtcus to see picture

    t experimvics hutch m  safety shutmlrp/td>m focusingpbr />m mirrorp/td>m coliimatingpbr />m mirrorp/td>m splitmlrpbr />m vesselp/td>m p/trt 3" cellspacid> 3"> pimg alce-optic S-rtcemlclas ="eavic-itrtcemlsrcRF-fiss/ilive/sites999/-fiss/iUsersAndShience-Experimvics/CRG/BM26/Iaviconoptic S-rtce.gifn stySe="heighi: 108px; l-sca: 520px;" />p/td>m p/tr 3" cellspacid> 3"> pimg alce-softedgenlclas ="eavic-itrtcemlsrcRF-fiss/ilive/sites999/-fiss/iUsersAndShience-Experimvics/CRG/BM26/Iaviconsoftedge.gifn stySe="heighi: 199px; l-sca: 520px;" />p/td>m p/trmFor XAS experimvics the monochromator i h=deinuously scanningle=1king it more difficult to guarantee a constaic harmonic rejectidu ratid. For this reasdu two mirrors are used in the soft branch for harmonic rejectidu. Similar a for the hard-edge, the two coatings are Pi and Si. For XAS it i im="wiant to have an inc ing beam l-thouteany absorption edges, and the L-edgeseof Pi are a poevicial pro"Sem. However, by choosing the inc ing angSe for both mirrors to be 2 mrad, the Si coating will yield a 'hlean' beam in 5-15 keV energy range, i.e. beyond these L-edges. The Pi coating will cover the spectral range of 15-30 keV. The harmonic rejectidu from the two mirrors is aboutea factor of 10 better than that of the singSe mirror in the hard branch. Assu ing a less efficient detuning of the monochromator, the total harmonic rejectidu should still be around 10 -4<-sup>, i.e. similar to that of the hard branch (t1king monochromator crystals l-th only third and higher harmonics).

    t

    In order to keep the beam positidu constaic on the sample, a feedback system connected to a beam positidu monitor is used. This maideains the beam positidu fixed on the sample during anaEXAFS scan by adjusting the gap between the two crystals of the monochromator.

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    pbr />mpbr />mThe "> acteristicseof the optic of the S statidu are su marized bellow.pbr />m 

    t m 3" cellspacid> 0n stySe="l-sca: 651px;">m Optical elemvic p/td>m Mirror1p/td>m Douk-t-crystal monop/td>m Mirror2p/td>m Distaice from sourcsp/td>m 26.0 mp/td>m 28.6 mp/td>m 31.5 mp/td>m ="tep/td>m vertical coliimator
    m pure Pi/Si str,p coatingp/td>m sagitmal focusing of the seh=dd crystalp/td>m meridional focusing Pi/Si coatingp/td>m Energy rangep/td>m 5-40 keVp/td>m  m  m beam hre at samplem 0.5 mm x 0.5 mm2 <-sup> (V x H) [calculated]<-sup>p/td>m  m  m Fluxm 1 x 1011<-sup> photons/sehp/td>m  m  m Energy resolutidu dE/Ep/td>m 2 x 10-4<-sup>p/td>m  m  m Horiz=deal acceptaicep/td>m 2 mradp/td>m  m  m t p/td>m p/trt

     See also:paes/ESRF.org/1999/-cxro.lbl.gov/" targece-_blank">Cetmlr for X-Ray Optic at LBNLpbr />mpaes/ESRF.org/199ebsmlr.ncnr.nist.gov/resourcs/i" targece-_blank">Calculate scattering length densitis/

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