Bunch Bunch Compressor 3 Compressor 3

Torsten Limberg for Frank Torsten Limberg for Frank Stulle et al.Stulle et al.

Basic Bunch Compression Basic Bunch Compression Mechanism with Magnetic Mechanism with Magnetic

ChicaneChicane

s

d E/E

inc o m ing lo ng . p ha se sp a c e

lo w e ne rg y tra je c to ry

c e nte r e ne rg y tra je c to ry

hig h e ne rg y tra je c to ry

s = -R56*

TTF-II Compression TTF-II Compression SystemSystemTwo 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

BC-3 Lay OutBC-3 Lay Out

R56: 0.025 - 0.1 mm

Incoming optics matching Incoming optics matching sectionsection

First half of S-bendFirst half of S-bend

22ndnd part of S-bend part of S-bend

Outgoing matching Outgoing matching sectionsection

Horizontal Dispersion in Horizontal Dispersion in BC-3BC-3

Optics of BC-3Optics of BC-3

Longitudinal Phase Space Longitudinal Phase Space EvolutionEvolution

TraFiC4 results: slice emittance and TraFiC4 results: slice emittance and projected emittance development through projected emittance development through

BC-3 for different designsBC-3 for different designs

0

0.5

1

1.5

2

2.5

3

0 2 4 6 8 10 12 14 16

Distance [m]

corr. emittance [mm mrad]

SaclayDESY4-bend

DESY shielded

0.5 1

1.5 2

2.5 3

3.5 4

4.5 5

0 2 4 6 8 10 12 14 16

Distance [m]

proj. emittance [mm mrad]

SaclayDESY4-bend

DESY shielded

0.8 0.9

1 1.1 1.2 1.3 1.4 1.5 1.6 1.7

0 2 4 6 8 10 12 14 16

Distance [m]

slice emittance [mm mrad]

SaclayDESY4-bend

DESY shielded

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 @ =6nm)(s > 0 corresponds to the bunch tail)

A C C 4 on , A C C 5 o ff,A C C 6 n o t yet in sta lled

TTF-II Starting Scenario TTF-II Starting Scenario ((=30nm)

BC2BC2 BC3

Transverse emittance, current, energy spread Transverse emittance, current, energy spread along the bunch and longitudinal phase space along the bunch and longitudinal phase space

at entry of BC-2at entry of BC-2(E. Schneidmiller et al.)(E. Schneidmiller et al.)

Transverse emittance, current, energy spread Transverse emittance, current, energy spread along the bunch and longitudinal phase space along the bunch and longitudinal phase space

at exit of BC-2at exit of BC-2

Transverse emittance, current, energy spread Transverse emittance, current, energy spread along the bunch and longitudinal phase space along the bunch and longitudinal phase space

at exit of BC-3 at exit of BC-3 (including CSR effects in 1-d model)(including CSR effects in 1-d model)

Transverse emittance, current, energy spread Transverse emittance, current, energy spread along the bunch and longitudinal phase space along the bunch and longitudinal phase space

at entry of undulator at entry of undulator (including space charge effects in upstream (including space charge effects in upstream

drift)drift)

Peak current vs. transverse emittance for Peak current vs. transverse emittance for given slice energy spread and saturation at given slice energy spread and saturation at the end of the undulator (the end of the undulator (=30nm, 30% safety) =30nm, 30% safety)

Status of Instrumentation Status of Instrumentation (D. Nölle)(D. Nölle)

Strip lines (4): Strip lines (4): April 03April 03 Pickup Array (2): Pickup Array (2): feed throughs ready feed throughs ready

for assemblyfor assembly Toroids (2): Toroids (2): March 03March 03 OTR Stations Standard (2): OTR Stations Standard (2): Feb 03Feb 03 OTR Special @ 75 m: OTR System OK, chamber OTR Special @ 75 m: OTR System OK, chamber

not not orderedordered @ 78 m:@ 78 m: design done, window design done, window

flanges, screen flanges, screen and optical and optical system need to be system need to be procuredprocured

Resistance Monitor: Resistance Monitor: April 03April 03 Phase monitor: Phase monitor: March 03March 03

Vacuum Chamber Vacuum Chamber Support Status Support Status

Fertigungsstand für Fest- und Lospunktstützen TTF / BC III Ordner 3Aufträge: Jagnow Stand:08.01.03 Bearbeitungsbeginn: Fertig

Stck. Benennung Zeichnungsnr. Stck. Bestehend aus: Zeichnungsnr. Abtlg:/Name Datum Datum4 Festpunktstütze RK-71 9 02 1541/O.000

Werkstattauftragsnr.: 31 63 24 4 Aufsatz Festpunktstütze D 38 2 02 1541 / A.000 ZM 2 Bremer 3933 7/22/2002 28-OctWerkstattauftragsnr.: 32 24 13 4 Stützensäule D 63,5 2 02 1532 / B.000 ZBAU 1 7/18/2002 19-Nov

1 Festpunktstütze 71 m 9 02 1535/O.000

Werkstattauftragsnr.: 31 63 24 1 Aufsatz Festpunktstütze 71 m 2 02 1535 / A.000 ZM 2 Bremer 3933 7/22/2002 28.Okt.Werkstattauftragsnr.: 32 24 13 1 Stützensäule D 63,5 2 02 1532 / B.000 ZBAU 1 7/18/2002 19-Nov

1 Festpunktstütze 79 m 9 02 1554/0.000

Werkstattauftragsnr.: 32 64 29 1 Aufsatz Festpunktstütze 79 m 2 02 1554 / A.000 ZM 2 Bremer 3933 1/9/2003Werkstattauftragsnr.: 32 24 13 1 Stützensäule D 63,5 2 02 1532 / B.000 ZBAU 1 7/18/2002 19-Nov

1 Festpunktstütze 73 m 9 02 1555 / 0.000

Werkstattauftragsnr.: 31 63 24 1 Aufsatz Festpunktstütze 73 m 2 02 1555 / A.000 ZM 2 Bremer 3933 1/9/2003Werkstattauftragsnr.: 32 24 13 1 Stützensäule D 63,5 2 02 1532 / B.000 ZBAU 1 7/18/2002 19-Nov

6 Lospunktstütze RK-70 9 02 1540 / 0.000

Werkstattauftragsnr.: 31 63 24 6 Aufsatz Lospunktstütze D 38 2 02 1540 / A.000 ZM 2 Bremer 3933 7/22/2002 28-OctWerkstattauftragsnr.: 32 24 13 6 Stützensäule D 63,5 2 02 1532 / B.000 ZBAU 1 7/18/2002 19-Nov

5 Lospunktstütze 67 m 9 02 1532 / 0.000

Werkstattauftragsnr.: 31 63 24 5 Aufsatz Lospunktstütze 67 m 2 02 1532 / A.000 ZM 2 Bremer 3933 7/22/2002 28-OctWerkstattauftragsnr.: 32 24 13 5 Stützensäule D 63,5 2 02 1532 / B.000 ZBAU 1 7/18/2002 19.Nov.

2 Lospunktstütze 69 m 9 02 1534 / 0.000

Werkstattauftragsnr.: 31 63 24 2 Aufsatz Lospunktstütze 69 m 2 02 1534 / A.000 ZM 2 Bremer 3933 7/22/2002 28-OctWerkstattauftragsnr.: 32 24 13 2 Stützensäule D 63,5 2 02 1532 / B.000 ZBAU 1 7/18/2002 19-Nov

1 Lospunktstütze VK-81 9 02 1542 / 0.000

Werkstattauftragsnr.: 31 63 24 1 Aufsatz Lospunktstütze VK-81 2 02 1542 / A.000 ZM 2 Bremer 3933 7/22/2002 28-OctWerkstattauftragsnr.: 32 24 13 1 Kurze Stützensäule D 63,5 102 1542 / B.000 ZBAU 1 7/18/2002 19-Nov

21Stützen liegen abholbereit im Geb.14 !!

SummarySummary

BC3 design complete and fabrication BC3 design complete and fabrication of components mostly on scheduleof components mostly on schedule

Two operating scenarios for the Two operating scenarios for the bunch compression system:bunch compression system: With 3rd harmonic RF With 3rd harmonic RF

Full start to endsimulation done, lases at 6 Full start to endsimulation done, lases at 6 nmnm

For start up: No 3rd harmonic RF, lower For start up: No 3rd harmonic RF, lower energyenergy

Start to end simulation begun, lases at 30 nmStart to end simulation begun, lases at 30 nm