Subject: RF Meeting for 8 GeV SC Linac Tuesday 2nd 3:00 Penthouse
From: "G. William Foster" <gwf@fnal.gov>
Date: Fri, 27 Feb 2004 13:06:49 -0600
To: Ralph Pasquinelli <pasquin@fnal.gov>, Iouri Terechkine <terechki@fnal.gov>, Nikolay Solyak <solyak@fnal.gov>, Brian Chase <chase@fnal.gov>, Markus Huening <mhuening@fnal.gov>, Bob Kephart <Kephart@fnal.gov>, "C. Shekhar Mishra" <mishra@fnal.gov>, Al Moretti <moretti@fnal.gov>, Dave Wildman <wildman@fnal.gov>, Ding Sun <ding@fnal.gov>, Vladimir Kashikhin <kash@fnal.gov>, Steve Hays <slh@fnal.gov>, Pierre Bauer <pbauer@fnal.gov>, Roger Dixon <roger@fnal.gov>, steve holmes <holmes@fnal.gov>, Eric Prebys <prebys@fnal.gov>, Weiren Chou <chou@fnal.gov>, Ioanis Kourbanis <ioanis@fnal.gov>, Milorad Popovic <popovic@fnal.gov>, Howard Pfeffer <pfeffer@fnal.gov>

Next Tuesday I'd like to talk about the coaxial-shorted-stub option for the E-H tuner.
the state of the art (as of 1970) is at:

http://tdserver1.fnal.gov/8gevlinacPapers/Ferrite_Tuners/Pages_from_Linear_Ferrite_Book.doc
(the book is in the library)

Dave Wildman has contacted Trans-Tech to get a price & delivery
on their best replacement material for the material used in the coax tuner.
If we don't get an answer we like, we could try (Domen?) in St. Peterburg.

For each shorted stub we are looking at:
300kW peak power (per stub, reflected)
1.5% duty cycle
4.5kW average power
~0.2dB loss (target)
~180W power dissipation in the ferrite

The main design questions I see are:
1) getting the bias field in ~100usec
2) getting the heat out
3) how close to the doorknob coupler does this live,
    i.e. do we need directional couplers in & out
4) can/should this be integrated with the slow
    mechanical tuner (function of 3-stub tuner in TESLA).
5) are there simpler configurations than the
    Magic Tee / E-H tuner to accomplish the limited range
    of phase & amplitude adjustment that we need?

-Bill Foster