Recent Measurements in ACC1 (12.9. & )

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Presentation transcript:

Recent Measurements in ACC1 (12.9. & 15.9.2008) Winni Decking, Torsten Limberg, Eduard Prat, Elmar Vogel FEL Beam Dynamics Seminar 22.9.2008 Winni Decking

Motivation Preparation of ACC39 installation next year Wake and coupler kicks will be much stronger than in 1.3 GHz cavities Estimation (M. Dohlus, 19.03.2007): 3% emittance growth for 1mm offset Goal: Measure effects of wakefields and coupler kicks on the projected emittance in the present setup and compare next year (although next years FLASH will have new gun, new ACC1, …) Verify that enough space is available for empirical orbit tuning in the future ACC39 Winni Decking

FLASH Setup Steerers in gun are used to steer trajectory in ACC1 Eduard’s Orbit Tool used to correct trajectory back to original in BC2 area (works perfect) Winni Decking

BUMPS in ACC1 H1Gun + H2 Gun Winni Decking

BUMPS in ACC1 H3 Gun Winni Decking

Emittance Winni Decking

Mismatch Parameter Winni Decking

Sum of HOM Signals Winni Decking

Trajectory can be varied in a wide range in ACC1 Conclusion Trajectory can be varied in a wide range in ACC1 Trajectory amplitudes of up to 5 mm in C1.ACC1 show no effect on projected emittance Trajectory amplitudes of 20 mm in C1.ACC1 show effect on projected emittance only in the ‘upper left’ corner Further analysis should include optics back-tracking and coupling Winni Decking