Draft Proposal of Test Facility of Final Focus and Interaction Region at ATF-KEK

1. Goals

(1) Final focus test beam at ATF

• experimental verification of Pantaleo's optics
• demonstration of 30nm focus
• establishment of tuning methods
• nano technology of BPM, Shintake monitor ( laser interferometer )
• final focus quadrupole magnet in the support tube
• beam halo studies by "octupole optics" etc.

(2) Nanometer stabilization of the final doublet

• one final doublet and nano
• BPM at IP for the demonstration
• support tube structure; role of a central CFRP tube
• nanometer position measurements based on laser interferometer(QPD)
• nanometer stabilization with active movers
• inertial sensors
• fast feedback system at nanometer level

2. Options

(1) Test facility for photon collider

• Laser facility laser: 1.3J/pulse with a spot size of 3um, 192 pulses/1.4ns at 150Hz optics at IP
• Study of "strong" QED

3. Possible Schedule

• 2005 construction starts
• 2008 Summer, completion
• 2009 30nm
• 2010 - photon beam and strong QED experiments

4. Reference

• 1989 Optics design (Oide)
• 1990 Proposal (CDR)
• 1993 summer completed
• 1994 spring 70nm
• 1995 RF-BPM
• 1997 E144:collision with laser (non-linear QED)