Submerged Production System - A Final Report

Burkhardt, J.A.; Michie, T.W.

doi:10.4043/3450-ms

Cited by 3 publications

(2 citation statements)

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“…Cavity beam position monitors measure the centroid of the particle's charge distribution and, hence, particles with less energy than E b are stronger deflected by the spectrometer magnet and could shift the measured beam position. Halo and tail generation estimates based on simulation [60] reveal that at the exit of the linac the beam profile is superimposed by a symmetric halo extending to about ±300 (50) µm in x(y)-direction 31 . The fraction of particles off in energy was estimated to be few times 10 −5 with a broad energy spectrum that sharply peaks very close to the nominal beam energy.…”

Section: Suitable Spectrometer Locationsmentioning

confidence: 99%

“…It is also estimated that this background does not affect the Compton endpoint position in a significant manner. The synchrotron photons from the quadrupole fields within the linac and the beginning of the BDS have a ∼ 10 2 times lower critical energy [60,61] than those from the spectrometer magnet and are considered to be of no serious issue. However, due to the uncertainties in the charged particle background simulation it is favorable to locate the spectrometer after a protective bend, so that the beam position will be much less impacted.…”

Section: Suitable Spectrometer Locationsmentioning

confidence: 99%

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ILC beam energy measurement by means of laser Compton backscattering

Muchnoi

Schreiber

Viti

2009

Nuclear Instruments and Methods in Physics Research Section A:

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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 endpoint is measured or the positions of the Compton backscattered γ-rays, the edge electrons and the unscattered beam particles are recorded. 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. Simulation studies support the use of an infrared or green laser and quartz fiber detectors to monitor the backscattered photons and edge electrons. Employing a cavity monitor, the beam particle position downstream of the magnet can be recorded with submicrometer precision. Such a scheme provides a feasible and promising method to access the incident beam energy with precisions of 10 −4 or better on a bunch-to-bunch basis while the electron and positron beams are in collision.

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Section: Suitable Spectrometer Locationsmentioning

confidence: 99%

Section: Suitable Spectrometer Locationsmentioning

confidence: 99%