Igor Zagorodnov BD meeting, DESY

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Presentation transcript:

Igor Zagorodnov 22.09.2008 BD meeting, DESY Wakefields of the Pump Igor Zagorodnov 22.09.2008 BD meeting, DESY

Pumping slots Ion-Pump 70 mm Boris Nagorny

Pumping slots 78 items after LINAC Boris Nagorny 1 mm 1,5 mm 2 mm

Pumping slots: cavity model b a

Pumping slots

Pumping slots TOTAL (LINAC to SASE2) Pipe (456m) Collimators (4 items) Kickers (3*10m) Pumps (78 items) Loss 3430 4343 2659 593 (5.4%) Spread 4332 3164 1557 242 (2.6%) Peak -9048 -9088 -4633

Pumping slots

Pumping slots analytical 4 slots 12 8 Extrapolation O(s-0.5)

Pumping slots s = 1 mm s = 25 mm Loss, kV/nC Spread, kV/nC analytical 1.2 0.5 4 slots 0.23 8 slots 0.21 0.14 12 slots 0.1 Loss, kV/nC Spread, analytical 7.6 3.1 4 slots 6.5 2.1 8 slots 5.6 1.8 12 slots 4.8 1.6 +30% +130%

4 slots. Accuracy check s = 250 mm fine vs. coarse mesh ~ 3% error in the spread parameter