• C. Milardi, D. Alesini, M.E. Biagini, C. Biscari, A. Bocci, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G.O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, F. Marcellini, G. Mazzitelli, F. Murtas, L. Pellegrino, M.A. Preger, L. Quintieri, P. Raimondi, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov
  INFN/LNF, Frascati (Roma)
• N. Arnaud, D. Breton, L. Burmistrov, A. Stocchi, A. Variola, B.F. Viaud
  LAL, Orsay
• S. Bettoni
  CERN, Geneva
• P. Branchini
  roma3, Rome
• M. Esposito
  Rome University La Sapienza, Roma
• E.B. Levichev, P.A. Piminov, D.N. Shatilov
  BINP SB RAS, Novosibirsk
• K. Ohmi
  KEK, Ibaraki
• V.V. Smaluk
  BINP, Novosibirsk
• D. Teytelman
  SLAC, Menlo Park, California
• P. Valente
  INFN-Roma, Roma

In 2007 DAΦNE was upgraded to operate in a regime of large Piwinski angle, with a novel IR optics, reduced vertical beta at the interaction point, and additional sextupoles providing for crab waist collisions. The specific luminosity was boosted by more than a factor of four, and the peak luminosity was more than doubled with respect to the maximum value obtained with the original collider configuration. The DAΦNE commissioning as well as the first experience with large Piwinski angle and crab waist collisions scheme will be reported.

Slides

• P.A. Piminov, V.E. Blinov, A.V. Bogomyagkov, S.E. Karnaev, G.V. Karpov, V.A. Kiselev, S.A. Krutikhin, G.Y. Kurkin, E.B. Levichev, O.I. Meshkov, S.V. Motygin, S.A. Nikitin, I.B. Nikolaev, V.N. Osipov, V.M. Petrov, E. Rotov, E. Shubin, V.V. Smaluk, G.M. Tumaikin, A.N. Zhuravlev
  BINP SB RAS, Novosibirsk

The VEPP-4M electron-positron collider is now operating with the KEDR detector for high-energy physics experiments in the 1.5−2.0 GeV beam energy range. Parallel with these experiments, the VEPP-4M scientific team carries out a number of accelerator physics investigations. A new registration system for the Touschek polarimeter has been put into operation. A new NMR-based system for suppression of the guide field ripples has been developed. The counting rate of the Touschek particles has been measured as a function of the beam energy in the range from 1.85 to 4 GeV. The measurement results can be claimed at the future super B and C-Tau factories. For simultaneous measurement of the transverse beam position and inclination angle an X-ray multi-pinhole camera has been designed, manufactured and installed at the VEPP-4M. To suppress the longitudinal instability caused by high-order modes of the RF cavities, a feedback system has been developed.