From:	Marc C Ross
Sent:	Tuesday, November 23, 2010 9:24 PM
To:	N.Toge; akira.yamamoto@kek.jp; carwar@fnal.gov; Victor R Kuchler; 
atsushi.enomoto@kek.jp; John.Andrew.Osborne@cern.ch; 
nicholas.walker@desy.de; peterg@fnal.gov; wilhelm.bialowons@desy.de; 
jmp@slac.stanford.edu
Cc:	Marc C Ross; Marc C Ross
Subject:	CFS / Global Webex meeting, Wednesday 24.11.2010; nominal time - PM 
report

PAC review, 11-12 November, 2010

http://ilcagenda.linearcollider.org/conferenceTimeTable.py?confId=4680

Here are some highlights of the PAC review – from my notes:

Michael Peskin’s talk was interesting – in it he explicitly referred to a 
higher energy for ILC. This is his last slide:

“
The tight focus of the GDE on 500 GeV is a disadvantage in the debate over the 
correct energy. The question will always be raised: Can we eventually go to 
higher energies ?

The GDE and its PAC should discuss a vision for later, higher energy stages of 
the ILC. This could play out over decades.

A model is the “site-filler” accelerator vision in the original proposal for 
Fermilab. Mike Harrison discussed a staged approach to CLIC with ILC as the 
first stage.

Another possible vision is a plasma wake-field accelerator (which could have 
the same time structure) as an afterburner to ILC.
“

Here are some excerpts from my PAC closeout notes – (transcribed a week later).


1)	The panel will strongly underline the fact that both Flash and Xfel are 
adequate SRF linac demonstrators. Another such demonstrator is not necessary.
2)	It is essential that the core team be maintained post-2012. To keep the 
effort from diverging.
3)	The committee was really impressed with SRF R&D progress. The recent 
results from JLab - 9 out of 10 testing successfully - is a tremendous 
achievement. With these results we have made the 'proof of principle' of the 
process; we now have to make it cheap.
4)	The 9mA studies have made a further step forward. Having some time on 
Flash is not a contentious issue. 
5)	The DR extraction kicker studies have proven successful. Now the ATF 
team have to get the small beam size. 
6)	Cornell studies on e-cloud have been comprehensive and better than 
studies done anywhere else. Before the work stops it is important to benchmark 
the modeling codes. 
7)	SB2009. PAC was impressed with ongoing HLRF R&D at Slac and Kek. There 
is clearly much better collaboration with the physics community. 
8)	SRF industrialization. We have to preempt the XFEL costs. We have to be 
prepared to explain why the RF for ILC will not be just an extrapolation. LHC 
magnets could have been 2x or more expensive. But it turned out much better. 
We should follow the LHC example. Namely - to ask for the minimum required 
effort for each part. 

The PAC membership has ‘rotated’. Stuart Henderson, Hans Weise and Katsunobu 
Oide are new members. 
The written closeout draft will be sent to Barry and Sakue shortly. Then made 
public.

Marc