20.9.2010 © 2010 UNIVERSITÄT ROSTOCK | FAKULTÄT INFORMATIK UND ELEKTROTECHNIK Q ext estimations for the "Broad-Hook"-HOM coupler H.-W. Glock Universität.

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Presentation transcript:

© 2010 UNIVERSITÄT ROSTOCK | FAKULTÄT INFORMATIK UND ELEKTROTECHNIK Q ext estimations for the "Broad-Hook"-HOM coupler H.-W. Glock Universität Rostock - Institut für Allgemeine Elektrotechnik

2 "Classical" LEP hook design as starting point (priv.com. WW) © 2010 UNIVERSITÄT ROSTOCK | FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock 2 coaxial 50-Ohm-port (connector not modelled) adjustable capacitive coupling combined E-/H-field coupling, capacity couples to outer conductor support carries liquid helium reminder

© 2010 UNIVERSITÄT ROSTOCK | FAKULTÄT INFORMATIK UND ELEKTROTECHNIK U. van Rienen – H.-W. Glock 3 E-field 704 MHz strong capacitive coupling between "hook" and outer conductor capacitive coupling at hook determines notch resonance frequency reminder

4 Pure hook not tunable for 704 MHz => Modification of hook end in order to adjust fundamental mode notch filter © 2010 UNIVERSITÄT ROSTOCK | FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock 4 enlarge capacitive coupling at hook with additional surface element reminder

© 2010 UNIVERSITÄT ROSTOCK | FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock 5 Waveguide(TM 0 )–Coax–Transmission fundamental mode frequency => Tuning ok reminder

© 2010 UNIVERSITÄT ROSTOCK | FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock 6 Q-ext estimations based on: CSC-coupling of 8 modes in D=130mm-coupler-cavity-connection (TE11,TM01, TE21,TM11,TE01) couplers left-right mirrored-symmetric (But: cavity asymmetric, no coupler calc for D=140mm-pipe up to now) D=80mm beam pipes left open (but most below cut-off)

© 2010 UNIVERSITÄT ROSTOCK | FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock 7 This (cst-computation, csc-concatenation, q-fit-proc.) gives: Q_fundamental ^8 much steeper Q(f) decrease than filter-free coax, BUT: still to high GHz Is it possible to put coupler port closer to cavity waist (cav.design used from )

8 Our attempts to improve coupling © 2010 UNIVERSITÄT ROSTOCK | FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock 8 23/02/ increase penetration depth: but poor effect, not nice for dark current flip hook to come closer to cavity: but total changeof filter behaviour, not tuned yet