Freiburg 2008 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 71: Beschleunigerphysik III
T 71.7: Vortrag
Freitag, 7. März 2008, 15:30–15:45, KGI-HS 1019
ILC Beam Energy Measurement by means of Laser Compton Backscattering — •Michele Viti1, Heinz Juergen Schreiber1, and Nickolai Muchnoi2 — 1DESY, D-15703 Zeuthen, Germany — 2BINP institut, Novosibirsk, Russia
A novel, non-invasive method of measuring the beam energy at the International Linear Collider is proposed. Laser light collides head-on with beam particles and either the energy of the Compton scattered electrons near the kinematic end-point (edge) is precisely measured or the positions of the Compton backscattered γ-rays, the edge electrons and the non-interacting beam particles are recorded with high accuracy. A compact layout for the Compton spectrometer is suggested. It consists of a bending magnet and position sensitive detectors operating in a large radiation environment. Several options for high spatial resolution detectors are discussed. Based on simulation studies, operation with an infrared or green laser together with radiation hard quartz fiber detectors to record the positions of backscattered photons and edge electrons as well as the beam downstream of the magnet by means of a cavity BPM provides a feasible and promising scheme to access the incident beam energy. Relative precision of the energy of 10−4 or better is achievable on a bunch-to-bunch basis while the electron and positron beams are in collision.