Experiments: Approved - Active

Study of Compton Scattering of Picosecond Electron and CO₂ Laser Beams to Prototype the Polarized Positron Source for Japan Linear Collider

Below are a drawing and photos of the Compton chamber installed on ATF Beamline 1:

Above: The Compton chamber installed on ATF Beamline 1. The electron beam enters from the left. Up front is the zinc-selenide windows for injection and dump of the CO2 laser beam. On either end and on top one can see actuators and CCD cameras for monitoring the electron and laser beams.

Below: The Compton chamber isbarely visible on the left of the (blue colored) dipole magnet. The electron beam deflected by the magnet is stoped in a Faraday cup below the bottom-right corner of the photo. The x-ray detector isburried in the lead shielding immediately to the right of the dipole magnet. The measured background  for an electron beam pulse of 0.5 nC was less than 30000 x-ray photons equivalent when the beam tune was set right. The expected number of photons is a few orders of magnitude higher (see proposal). In the far background is the aluminum plate of the HGHG experiment radiator wiggler, holding five e-beam position monitors.

Last Modified: December 3, 2007
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