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  • pg 1
									The LCLS-II BSY, LTU,
   and UH Layout
       Paul Emma et al.
        May 18, 2011
      LCLS-II Meeting
                             LCLS-II Machine Layout
 RF                                        RF
gun-2                     LCLS-II         gun-1                    LCLS-I
        L0                                       L0                existing
                                                                                       und-hall-1
                      X                                     X
                L1       BC1 L2 BC2   L3          L1       BC1   L2   BC2   L3       LCLS-I

    one more                                                                            3-15 GeV
    km of linac                      Sector-20 wall
                                                                4-14 GeV bypass line
                                                                                          HXR

                                                                                            SXR

                                                                                       und-hall-2
              New injector at sector-10 (1 km upstream)
              Two new bunch compressors and 4-14 GeV linac (~1 km)
              1200-m long bypass (old PEP-II 9-GeV line) goes around LCLS-I

                                                                                            Slide 2
   Inside Linac Tunnel - Looking Downstream

                                                                                       Use existing
                                                            9-GeV (PEP-II)             PEP-II bypass
                                                   25.610”         17”   3-GeV         line on linac
                                                                         (PEP-II)      tunnel ceiling
                                      25.570”                                          (FODO cells with
                                                                                       one quad every
               120”                 47”           LINAC                                101.6 m)

                                                                                       Moves LCLS-II
                                                                                       25.57” higher
                                                  66”                                  than LCLS-I



                                                                     (ID-344-013-30)

                                                            132”


DOE CD-1 Review of the LCLS-II Project, April 26-28, 2011                                         Slide 3
     Existing Bypass Line in Linac Tunnel




LCLS-II
Bypass
Line




                                            Slide 4
                LCLS-II Layout After Linac




                     LCLS-I (approx.)           LTUH (LCLS-II)




2.4-deg bends (4)

                    pulsed bend
                                                LTUS (LCLS-II)




                                  Armin Busse                    Slide 5
LCLS-II Layout After Linac




    Pulsed   Need 2 low-profile
     bend      quads here




                                  Slide 6
               Head-House Port (South Side)



                                        LCLS-II-H
                                            LCLS-II-S


LCLS-I
X’ = -1.25 m
Y’ = -0.90 m




                            Wall face at Z’(LCLS) = 346.24 m
                                                               Slide 7
     LCLS-II Line Fits Close to LCLS-I in BTH




LCLS-II




LCLS-I




DOE CD-1 Review of the LCLS-II Project, April 26-28, 2011   Slide 8
          LCLS-II Beam Transport Layout
                      Undulator Hall, LCLS-I




               LTU1                            e- dump
                             LCLS-I                       FEE1

LINAC
                                                         Exp. Hall
        2.4°




                                                                 Slide 9
      X-ray Transport to Experimental Hall-2




J. Welch                                       Slide 10
Start-2-End Tracking with LCLS-II Optics


                                bypass line
                                                 2.4°
                                                bends

      BC1    BC2




                                                         HXR
                                                         und.




                                                        SXR not shown

                                                                Slide 11
            Thanks to M. Woodley and Y. Nosochkov
                  LCLS-II Electron Beam Diagnostics
                                                                                                  YAG screens
                                                                                                  OTR screens
                                                                                                  Wire scanners
                                                                                                  Bunch length mon.

gun

                   sd                      sd                                     sd
sd                                                                                                 
            11-1                    
             L1                 L2                        L3         sd       µ
                                                                                         sz                             sd
                   BC1 sz                        sz                                           
      DL1
            sd              11-3 to 14-4   BC2        14-7 to 20-4                 DL2


                                                                                                                        sd


          2 Transverse RF cavities (135 MeV & 5 GeV)
          6 YAG screens
          8 OTR screens
          19 wire scanners (each with x & y wires)
          3 bunch length monitors
          Gun spectrometer, injector spectrometer, dump spectrometer
          BC1 stopper, abort kicker, BSY stopper, 2 undulator stoppers
                                                                                                             Slide 12
             Muon Plug Wall Exit to HXR Dump



                          HXR      Self-Seeding         H-Dump
     Vert.             Emittance     Section
    bends              Diagnostics
                           and
             2.4-deg   Collimation
              bends               HXR
m-plug                          matching




                                                  HXU




                                                                 Slide 13
                                              Y. Nosochkov
New Abort Kicker Located Above Old D10 Box




   A. Ibrahimov
New abort kicker is in BSY now, but same as LCLS-I
New D2’ Stopper Needed (B-Line Bends Get Removed)




                                       A. Ibrahimov
New D2’ Stopper in BSY (and its backup stoppers)

                                     m-plug wall



                           QA0

                    ST61

                             QBP34




                ST61’

        ST60’
  D2’

                                               A. Ibrahimov
                                                         Slide 17
Start of Muon Plug Wall (17 m thick iron)




                                     A. Ibrahimov
                                               Slide 18
HXR Matching Section, HXU, and Dump




                                      H-Dump




 HXR       HXR Self-   HXU
Matching    Seeding
            Section




                                               Slide 19
                             Y. Nosochkov
 septum   Muon Plug Wall Exit to SXR Dump



                      SXR              Self-         S-Dump
     Vert.         Emittance         Seeding
    bends          Diagnostics       Section
           2.4-deg    and      SXR
            bends Collimation matching

m-plug




                                               SXU



                                                              Slide 20
                                           Y. Nosochkov
SXR 3-Wire Emittance Diagnostics Section + Collimation




           WSLTUS1




                           WSLTUS2




                                            WSLTUS3
                      Dx,y = 90
                      Dx,y = 120
                     SXR Emittance
                     Diagnostics and
                       Collimation




                                                      Slide 21
                                       Y. Nosochkov
 SXR Matching Section, SXU, and Dump




                                        S-Dump
           Self-Seeding
 SXR         Section
matching




                          SXU



                                                 Slide 22
                                Y. Nosochkov
                New Features in LCLS-II
Y-kicker + HLAM magnets in BTH to split beam into HXR & SXR @ 60 Hz each

LTUH line has 4 LTU-like wire-scanners and 2/2 final x/y collimators

LTUS line has 3 BC1-like wire-scanners and 2/2 final x/y collimators

Each undulator line has an insertable stopper (TDUNDH & TDUNDS)

Future self-seeding sections leads each new undulator (30-100 m)

Two separate electron beam dumps

Soft bends start each dump bend (no Be foil needed)

Two separate x-ray front-ends (diagnostics – J. Welch, P. Heimann, J. Frisch)

								
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