Taikan SUEHARA, ILC-Asia wg4 KEK, 2005/7/27 Laser interferometric beam size monitor (Shintake-monitor)

Taikan SUEHARA, ILC-Asia wg4 KEK, 2005/7/27 Baseline Layout 2.5m spacing from bend to dump. Edge of the dump is at ~10cm beyond the beam line.

Taikan SUEHARA, ILC-Asia wg4 KEK, 2005/7/27 Photons from beam pipe 70~90% of photons (by electrons interacting with pipe) come forward, up to beam energy (1.3GeV)

Taikan SUEHARA, ILC-Asia wg4 KEK, 2005/7/27 Photons from beam pipe No energy dependence for position of detector.

Taikan SUEHARA, ILC-Asia wg4 KEK, 2005/7/27 Photons from beam pipe Spread over beam pipe (signal is focused to center)

Taikan SUEHARA, ILC-Asia wg4 KEK, 2005/7/27 Photons from beam pipe

Taikan SUEHARA, ILC-Asia wg4 KEK, 2005/7/27 Photons from beam pipe Energy spectrum is broad up to 1.3GeV The rate seems to be very high (with no collimeter) –0.7~0.9 photons for 1 collision to pipe Position is much spread than signal

Taikan SUEHARA, ILC-Asia wg4 KEK, 2005/7/27 Shipping Optical table –Returned back to Nittsu because of some problem of carry-in (and bad weather) –Retry tomorrow with some attachments Other components –Have carried-in in Hongo –Now checking