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P.60. Markus Stockner, Bernd Dehning, Ewald Effinger, Jonathan Emery, Gianfranco Ferioli, Gianluca Guaglio, Eva Barbara Holzer, Daniel Kramer (CERN, Switzerland)

MEASUREMENTS AND SIMULATIONS OF IONIZATION CHAMBER SIGNALS IN MIXED RADIATION FIELDS

The LHC beam loss monitoring (BLM) system must prevent the super conducting mag- nets from quenching and protect the machine components from damages. The main moni- tor type is an ionization chamber. About 3500 of them will be installed around the ring. The lost beam particles initiate hadronic showers through the magnets, which are meas- ured by the monitors installed outside of the cryostat around each quadrupole magnet. They probe the far transverse tail of the hadronic shower. The specification for the BLM system includes a factor of 2 absolute precisions on the prediction of the quench levels. To reach this unprecedented accuracy a number of simulations are being combined to calibrate the monitor signals. To validate the monitor calibration the simulations are com- pared with test measurements. This paper will focus on the development of the hadronic shower tail and the signal response of the ionization chamber to the various particle types and energies. Test measurements have been performed at CERN and DESY and compared to GEANT4 simulations.

Dr. Bernd Dehning: bernd.dehning@cern.ch

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    61. A.Artemiev, V.Korchuganov, V.Rezvov, V.Moiceev, V.Novikov, A.Valentinov, Yu.Yupinov, A. Zabelin (RRC Kurchatov Institute, Moscow) Betatron motion coupling control in the electron storage ring Siberia-2 in Kurchatov Center of Synchrotron Radiation For synchrotron radiation (SR) sources - the dedicated electron (positron) storage rings - a high brightness of a photon beam represents the most interest. In turn the brightness of SR depends oppositely on the transverse phase volumes (emittances) of an electron beam as radiation source. For the given optical structure a horizontal emittance of electron beam is determined, mainly, by quantum fluctuations of SR, whilst vertical emittance is defined, basically, by a level of a coupling (width of a resonance) between vertical and horizontal betatron oscillation of particles. It is reported in the work that the control of the betatron coupling factor in SIBERIA - 2 storage ring in Kurchatov institute reaches a level of

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      with the use of skew-quadrupoles. Closed orbit distortions control at a micron level, an arrangement and the forces of skew - quadrupoles also are the objects of research. Ex- perimental dependence of the electron bunch transverse sizes on the coupling factor is presented.

Dr. Vladimir Nicolaevich Korchuganov: korchuganov@kcsr.kiae.ru

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