• M. Hüning, R. Jonas, J. Lund-Nielsen, F. Schmidt-Föhre
  DESY, Hamburg

The Positron Intensity Accumulator PIA at DESY is used to accumulate the intensity and damp down the emittance of the positrons produced in the Linac II before they are injected into DESY II. Up to 19 shots are collected and damped. During the damping process the (baseband) peak current is increased by about a factor 4. Therefore the signal from the circulating beam can be up to 80 times bigger than the injected beam and hence overload any first turn detectors. The injected beam however is bunched by the 3 GHz RF of the linac. By filtering the 3 GHz component of the antenna signal and subsequent demodulation it is possible to set up a BPM system detecting exclusively the injected beam.

• A. Bocci, M. Cestelli Guidi, A. Clozza, A. Drago, A.G. Grilli, A. Marcelli, A.R. Raco, R.S. Sorchetti
  INFN/LNF, Frascati (Roma)
• A. De Sio, E.P. Emanuele, E. Pace
  Università degli Studi di Firenze, Firenze
• L. Gambicorti
  INOA, Firenze
• J.P. Piotrowski
  VIGO System S.A., Ozarow Maz.

Beam diagnostics based on synchrotron radiation can use imaging techniques that allow monitoring beam transverse dimensions in real time. In particular the bunch-by-bunch transverse beam diagnostics is a powerful method that allows investigations of transient phenomena in which bunch motion and beam instabilities are correlated to the position in the bunch train. Such diagnostic methods need photon array detectors with response time in the ns down to ps range and dedicated fast electronics. At DAΦNE, the e+/e^- collider of LNF/INFN, preliminary measurements with a prototype of an IR array detector made by 32x2 pixels are in progress. The array has pixel of 50x50 μm² characterized by a response time of about 1 ns per pixel measured with the IR emission of the SINBAD beamline. The array detector and the 64 channels dedicated electronics has been installed at the 3+L experiment, a dedicated diagnostics of the e⁺ DAΦNE ring used to monitor the transverse dimensions of the beam. In this paper we describe the apparatus built to obtain IR imaging of a SR source and a turn-by-turn and a bunch-by-bunch transverse diagnostics of the stored bunches with a sub-ns time resolution

• V.Z. Verguilov
  DPNC, Genève
• V.C. Palladino
  INFN-Napoli, Napoli

Muon ionization cooling provides the only practical solution to prepare high brilliance beams necessary for a neutrino factory or muon colliders. The muon ionization cooling experiment (MICE) is under development at the Rutherford Appleton Laboratory (UK). It comprises a dedicated beam line to generate a range of input emittance and momentum. The measurement of emittance is the subject of another contribution. This talk focuses on the particle identification devices, with three time-of-flight stations, Cherenkov detectors, a preshower device and a full absorption calorimeter. These devices ensure the purity of the muon sample separating off pions in the incoming beam upstream of the cooling cell and muon decay electrons downstream of the cooling cell. By April 2009 it is expected that the beam and first set of detectors will have been commissioned, and operation performance will be reported.