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A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.

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Presentation on theme: "A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006."— Presentation transcript:

1 A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006

2 FLASH 0.5-1nC / bunch 1 MHz … 100 kHz, up to 800 s up to 700 GeV (later 1 GeV) RF gun FEL experimental area bypass 4 MeV150 MeV450 MeV1000 MeV undulatorscollimator bunch compressor Laser bunch compressor accelerator modules 250 m

3 Magnetic chicanes bunch compression x = R 16 * E/E

4 Energy stability Energy jitter – position jitter in dispersive sections (e.g. magnetic chicanes) – arrival-time jitter after chicane Requirement –timing jitter < 30 fs energy jitter < (35 m position jitter in BC) Use BPM to measure position jitter –resolution: 5 m (single bunch) –challenge: large horizontal aperture in BC2 unconventional design needed

5 BPM for the Bunch Compressor beam stripline vacuum stripline vacuum StriplineVacuum Beam beam tapering SMA output RF pulses beam tapering SMA output Beam Tapering SMA output RF Pulses cannot reach 5 m res. with analogue electronics use optical method

6 BPM installed in BC2 Compact! Thanks to: Jan Hauschildt Dirk Noelle Silke Vilcins Holger Schlarb Nils Mildner Christopher Gerth And many more…

7 T1-T2=T3 D=T3*c dE/E=D/R16 T1 T2 T3 EBPM ~300mm

8 40 GHz 8 GHz beam stripline pickup resolution < 3um

9 R16 T166 R3666 ~ 150 um resolution => 5*10 -4 resolution Scope in tunnel

10 Dphase = (-Etot+Egun+Eacc1*cos(pi*phase/180)) Etot

11 R16 T166 R3666 ~ 150 um resolution => 5*10 -4 resolution Scope in tunnel

12

13 Cable length correction: Red->Black R16 T166 R3666 Out-of-tunnel

14 Cable length correction: Black->Blue Out-of-tunnel

15 -Looked at synch light monitor -Scanned in y -Stopped when beam appeared to be approaching beam pipe


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