b ...but you will only get a
On Fri, 16 Jun 2017, Marcel Stanitzki wrote:
> Dear all
>
> As you may have heard, there are many discussions now ongoing on to start
> with
> an ILC at 250 GeV to lower the initial cost of the project.
> There seems to be quite some support for this scenario from Japanese
> Government circles.
>
> There are four distinct scenarios one could think about which involve both
> machine and tunnel options
>
> a) 250 GeV machine in a 250 GeV tunnel
> Only build a tunnel suitable for 250 GeV machine, later updates will
> require major construction work
>
> b) 250 GeV machine in a 500 GeV tunnel
> Only build a 250 GeV machine but drill the complete 31 km tunnel for 500
> GeV, later updates will only require installation of
> Cryomodules, RF, etc. and can be adiabatic
>
>
> c) 250 GeV machine in a 350 GeV tunnel
> Only build a 250 GeV machine but drill a tunnel suitable for 350 GeV
> machine
> With a 10% increase in cavity gradient, this can later be still enough to
> get to 500 GeV. The cost increase for the 350 GeV tunnel will be a few %
>
> d) 500 GeV or bust
> We need to start at 500 GeV, so go for the complete project as spec'ed in
> the TDR
>
> One should also point out, that the 250 GeV machine is not half-price, it is
> very roughly more like two-thirds of the 500 GeV machine, but detailed
> costing studies will be presented at the SLAC workshop
> Since this is really affecting the physics program and the associated
> timescales, we'd like to hear your input.
>
> Which option would you prefer, keeping the signals from Japan in mind ?
>
> Best wishes
>
> Andy & Marcel
>
> --
> Marcel Stanitzki
> DESY/ATLAS
> Notkestraße 85, 22607 Hamburg
> Geb. : 1c/O1.338
> Tel. : +49 40 8998 4930
> Cell : +49 40 8998 9 4930
>
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