W. Decking, M. Dohlus, C. Gerth, A. Krasnov, S. Lederer, T. Limberg, N. Mildner,

D. NoelleFEL Beam Dynamics Meeting, 27.06.2011

XFEL Bunch Compressor Chicane Layout

XFEL Bunch Compressor Chicane Layout

2IntroductionBunch Compressor Chicane Specifications: EDMS D*1658531

FEL Beam Dynamics Meeting, 27.06.2011W. Decking et al

Basic Requirements:

Magnetic Field Limits:BC0: 160 MeVBC1: 700 MeVBC2: 2.5 GeV (dump magnet)

XFEL Bunch Compressor Chicane Layout

3Chicane Layout

FEL Beam Dynamics Meeting, 27.06.2011W. Decking et al

Beam offsets BeamSize

15 degRF scan

XFEL Bunch Compressor Chicane Layout

4BC1 Layout

FEL Beam Dynamics Meeting, 27.06.2011W. Decking et al

XFEL Bunch Compressor Chicane Layout

5Intersection Layout

Energy BPM: Measure relative and absolute beam energy OTR-Screen: Measure dispersive beam profile Spoiler: Intercept off-energy tails

SR port: Online measurement of dispersive beam profile BAM before and after chicane: Measure relative and

absolute beam energy

FEL Beam Dynamics Meeting, 27.06.2011W. Decking et al

XFEL Bunch Compressor Chicane Layout

6OTR Screen Concept: D. Noelle et. al.

FEL Beam Dynamics Meeting, 27.06.2011W. Decking et al

Avoid long motion and thus extensive bellow units: Move in OTR from the wide side of chamber Visibility range given by maximum size of window flange

XFEL Bunch Compressor Chicane Layout

7Other parts Spoiler:

No concept yet Might be combined with OTR chamber Long bellows are back because spoiler has to cover

complete transverse space (400 mm) E BPM:

Design missing Mechanics will get challenging

FEL Beam Dynamics Meeting, 27.06.2011W. Decking et al

XFEL Bunch Compressor Chicane Layout

8Open questions

What else ? Are 1150 mm space between dipoles sufficient?

If not, chicane length cannot be changed anymore Angle has to be increased instead

Is the offset and R56 range correct ?

Chicane geometry changes are possible till September 2011

FEL Beam Dynamics Meeting, 27.06.2011W. Decking et al