Final Focus Optics Test at ATF Shigeru KURODA

Goal Test of the Local  Correction Optics Experience of Construction & Tuning FF system Test of LC FF Instrumentation e.g. nanoBPM Beam Jitter control at nanometer level by active mover, kick, measuring the beam position at nanometer level nanoBPM at IP Optional Laser facility

Merit High quality ATF DR beam is available. E=1.54 GeV x=3×10-6 m x:y=100:1 =0.1% Gaussian Beam

Optics & Geometry *x=10mm  *y=0.1mm :Similar to LC FF Length:s=36.6 m :construction in the hall is possible

Performance Tracking with 1000 particles x=1e-9 m, y=1e-11 m =0.1% @entrance → x =3.76m  y =35 . 9nm @IP

Local Correction Same order of  cancelled locally (GLC magnets are divided into two parts→two adjacent piles shows the same magnets)

Vibration Tolerance Similar difficulty to stabilize the beam ? ATF2 GLC/NLC DRIFT L 30mm 34mm BEND K0/K0 9.5E-6 8.7E-5  8mrad QUAD K1/K1 4e-5 x 0.9mm y 0.09mm 0.04mrad SEXT K2/K2 3e-3 0.3mm 0.4mrad Similar difficulty to stabilize the beam ?

Alignment Tolerance Correction=Correction1 + 5x Correction2 3x(Orbit distortion corr.) Final Q mover dz ( 50 m step ) SX mover dx dy ( 10 m step ) Correction2 3x(Orbit+dispersion distortion Corr.) The alignment tolerance is achievable

Summary ATF2 can be a good test facility for the LC FF. To be done To fill the boxes in the vibration tolerance Simulation for the alignment tolerance Investigation of the ATF DR beam stability for the test of instrumentation at ATF2 Study of fast feedback at ATF2 Study of utilizing the small size beam