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Bunch Compressor 3

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Two stage compression to avoid space charge emittance dilution on one hand and ... Strip lines (4): April 03. Pickup Array (2): feed throughs ready for assembly ... – PowerPoint PPT presentation

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Title: Bunch Compressor 3


1
Bunch Compressor 3
  • Torsten Limberg for Frank Stulle et al.

2
Basic Bunch Compression Mechanism with Magnetic
Chicane
Ds -R56d
3
TTF-II Compression System
Two stage compression to avoid space charge
emittance dilution on one hand and reduce
non-linear effects from the RF system on the
other.
BC2
BC3
BC2
BC3
4
BC-3 Lay Out
R56 0.025 - 0.1 mm
5
Incoming optics matching section
6
First half of S-bend
7
2nd part of S-bend
8
Outgoing matching section
9
Horizontal Dispersion in BC-3
10
Optics of BC-3
11
Longitudinal Phase Space Evolution
12
TraFiC4 results slice emittance and projected
emittance development through BC-3 for different
designs
13
Transverse emittance, peak current, mean energy
of longitudinal slices and energy spread along
the bunch at the undulator entrance (ca. 60 of
the bunch saturates _at_ l6nm)(s gt 0 corresponds
to the bunch tail)
14
TTF-II Starting Scenario (l30nm)
BC2
BC2
BC3
15
Transverse emittance, current, energy spread
along the bunch and longitudinal phase space at
entry of BC-2(E. Schneidmiller et al.)
16
Transverse emittance, current, energy spread
along the bunch and longitudinal phase space at
exit of BC-2
17
Transverse emittance, current, energy spread
along the bunch and longitudinal phase space at
exit of BC-3 (including CSR effects in 1-d model)
18
Transverse emittance, current, energy spread
along the bunch and longitudinal phase space at
entry of undulator (including space charge
effects in upstream drift)
19
Peak current vs. transverse emittance for given
slice energy spread and saturation at the end of
the undulator (l30nm, 30 safety)
20
Status of Instrumentation (D. Nölle)
  • Strip lines (4) April 03
  • Pickup Array (2) feed throughs
    ready for assembly
  • Toroids (2) March 03
  • OTR Stations Standard (2) Feb 03
  • OTR Special _at_ 75 m OTR System OK,
    chamber not ordered
  • _at_ 78 m design done, window
    flanges, screen and optical system need to be
    procured
  • Resistance Monitor April 03
  • Phase monitor March 03

21
Vacuum Chamber Support Status
22
Summary
  • BC3 design complete and fabrication of components
    mostly on schedule
  • Two operating scenarios for the bunch compression
    system
  • With 3rd harmonic RF
  • Full start to endsimulation done, lases at 6 nm
  • For start up No 3rd harmonic RF, lower energy
  • Start to end simulation begun, lases at 30 nm
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