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					                                CLIC RF STRUCTURE STUDIES

 If we believe our own road map we have about six years (in time for CLIC1) to come up with designs of
   both the accelerating and power extraction structures that : (i) have been shown by extensive testing to
   meet the required technical specification, and (ii) can also be mass produced at a reasonable cost.

 HUGH amount of work involved – cannot be done by present small team.

 Still many open questions : best type of structure, material, vacuum, fabrication, testing, cost …..

 Time to get more people involved and to take a broader look at the overall problems.
  RF specialists, metallurgists and surface physics experts, vacuum and mechanical engineering help, .….

 Have a new RF expert (Raguin) starting in October as a fellow, Igor will stay on as Project Associate, and
  we have a mechanical engineer (Menshov) who will join us as Sci. Assoc. starting in January.
  Some hope of getting a few new staff posts for R&D but in general will have to use existing staff and
  service groups (EST – material and surface studies, LHC – vacuum, ….. )

 All this work needs coordinating and the decisions that are taken should reflect a consensus of experts.

 Would like to create a new Structures Working Group consisting of people who have this expertise.

 Task of the group will be to formulate, implement and oversee a comprehensive study and test program.
 Over the last 10 years or so – impressive program of work has been carried out – Walter will review the
  accelerating structure part of this activity – and Lars should do the same for the PETS at a later date.

 For the moment – the study group will initially concentrate on the accelerating structures but will in the
  longer term look at all 30 GHz structures and components.

 As you are aware – presently going through a crisis due to breakdown levels and unexpected damage.

 You are probably less aware of two other major problems that we have recently encountered.
  (i)   main diamond-machining collaboration partner for >10 years has closed down their facility.
  (ii) indications that new 60 mm diameter discs with vacuum, water and waveguides incorporated will
        be very difficult and very expensive to machine.

 On the structure testing side – need a 30 GHz high power RF source available for the duration of the
 studies – this is an unresolved problem – planned to use the CTF2 klystrons and modulators in 2002 for
 CTF3 – no alternative source available for testing until 2005.

 Focus of CTF2 activities until then has to be on structure and component testing.

Organisation : Ian (Chaiman) Walter (Technical Secretary)

Members : Ian, Walter, Jean-Pierre, Hans, Lars, Erk, Igor, Steffen, Gunther, Gilbert, Daniel, Antonio,
Raguin, Menshov, vacuum expert, surface studies expert.

Mondays at 14:15 - when necessary (at irregular intervals).

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