### Proton Driver RF Meeting Aug 31, 2004

*(G.W. Foster)*

**\*\*\* NO meeting this week(Sept 7th) ;  TESLA collaboration meeting
\*\*\*\***

**Attendees:** Bob Kustom, Ralph Pasquinelli, Fernanda Garcia, Pierre
Bauer, Dave Wildman, Chris Jensen, Victor Yarba, Jim Strait, Milrad
Popovic, Vladiimir Kashikhin, Shreyas Bhat, Bill Foster

**[MINUTES]{.underline}**

**1. MESON AREA SMTF AREA EQUIPMENT LAYOUT**.     

Kerry Ewald's drawings of the layout of the 325 MHz front-end linac in
the M-P beamline area in Meson was discussed.  The overall Meson area
SMTF layout is being developed by a group led by Peter Limon meeting
Thursday afternoons.  

> a)      The M-E beamline is allocated to a 1300 MHz cryomodule test,
> which will eventually grow into a full RF station\
> (3-4 cryomodules) fed by the A0 photoinjector. 
>
> b)      The M-P beamline area is allocated mainly to the 325 MHz
> front-end linac, with some overflow from the control\
>  racks eventually needed for the A0 photoinjector.
>
> c)       A CW SCRF test facility is also under discussion, plans less
> developed.

The concept is sketched in:

<http://tdserver1.fnal.gov/8gevlinacpapers/Meeting_Minutes/RF/Meson_SMTF_Layout_Concept.ppt>

Individual drawings of the meson area and 325 MHz linac are at:

<http://tdserver1.fnal.gov/8gevlinacpapers/Meeting_Minutes/RF/Meson_Area_prelim_Layout.pdf>

<http://tdserver1.fnal.gov/8gevlinacpapers/Meeting_Minutes/RF/325_Linac_Area_Prelim_Layout.pdf>

**2.   Beta\<1 325 MHz FRONT END LINAC LAYOUT & PLANS**

GWF described plans for the 325MHz beta\<1 test area.  A single Klystron
will be used to drive the entire front-end linac, using an RF power
split and the fast-ferrite phase shifters. There appears to be a lot of
interest world-wide in this type of linac and it is hoped to develop a
design & prototype collaboration for various components of the linac.

Gennady Romanov will be coordinating meetings dedicated to the 325MHz
front end.

The ultimate configuration is a 28m, 35 MeV beam line containing:

        a) an Ion source copied from the SNS (or possibly Triumf)

        b) a 3 MeV Radio-Frequency Quad (RFQ) copied from JPARC(JHF)
front end

        c) a 3 m Medium-Energy-Beam Transport (MEBT) section copied from
the SNS

        d) a first 10m tank; either a Cryomodule, or warm DTL tank
copied from JHF, or...

        e) a second tank which will be a Cryomodule with spoke
resonators

        f) a 1m long beam analysis box

        g) a front end control/rack area \~2x the size of the SNS front
end room

        h) a modulator footprint taken from D. Wolff's presentation at
May 25^th^ meeting.

A shielding cave 16' wide by 25m long surrounds the linac starting at
the first DTL tank.  Bob Kustom expressed some question as to whether
this shielding wall would be needed.

A single 3 MW 325 MHz JHF Klystron drives the entire front end linac. 
The floor area reserved for the RF power split is approximately 15m x
4.5m.  Bob Kustom is working on equipment layout for a power splits
based on either the Radial Combiner or Waveguide/Directional Coupler
type RF fan-out. 

The RF power required by the Ferrtie tuners on each leg of the 325 MHz
fanout  is 20kW per SRF cavity.  This power level can be handled, with
care, using plated-circuit striplines, and it is hoped that each leg of
the RF fanout can be controlled by a "circuit board" containing the
circulator, branch-line hybrid, ferrite tuners and bias coils.

*The minutes of the RF meetings are online at:*

[http://tdserver1.fnal.gov/8gevlinacPapers/Meeting_Minutes/RF/Index.html](http://tdserver1.fnal.gov/8gevlinacPapers/Meeting_Minutes/RF/Index.htm)