Discussion on HOM dampers

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Presentation transcript:

Discussion on HOM dampers R. Hajima Japan Atomic Energy Agency March 4, 2009

Needs of HOM dampers ERL Cavity developed by KEK/JAEA/U-Tokyo 10 1 2 3 4 5 6 1.5 2.5 3.5 4.5 TESLA ERL (R/Q)Qext/f ( W /cm GHz) HOM frequency (GHz) TESLA　(HOM:5×2) ERL　(HOM:6×2) These results are true for “perfect HOM absorbers”

Needs of HOM dampers 3 3

HOM damper at Cornell ERL bonding = brazing 4 4

HOM damper at KEK/JAEA ERL “New IB004-1” was selected. bonding = hot isostatic press (HIP) 5 5

Discussion Items Coax or off-axis couplers Notch filters for couplers Waveguide heating is no problem for 100mA Material Temparature Carbon nanotube for Cornell main linac frequency range to be covered XFEL has HOM absorber at the end of module We need to manage high-frequency component Manufacturing Study needed Thermal cycle? Design to avoid cracking HIP seems promising Magnetization No problem, so far. conductivity (charging up) Carbon nanotube seems to be conductive in low temp.