The 3rd harmonic Structure

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Presentation transcript:

The 3rd harmonic Structure Markus Hüning

Limitation by Physics According to BCS theory the surface resistance is approximately This limits the ultimate gradient which can be reached, At 1.3 GHz this number is 1 nW at 2 K, at 3.9 GHz it is 9 nW. The limit scales from 50 MV/m to 17 MV/m

Limitation cntd Limit at 3 GHz ~ 25 MV/m At Cornell 25 MV/m was reached (1400°C treatment) For 3.9 GHz this translates to

Reschke 94

Padamsee 93

Status at Fermilab

String

Status at DESY

Status at DESY Modulator being modified (parts available) Klystron expected in July Circulators overdue (Feb) Waveguides on the way

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