Author: Kreinick, D.L.
Paper Title Page
MOPS084 Status of Electron Cloud Dynamics Measurements at CESRTA* 799
 
  • M.G. Billing, G. Dugan, M.J. Forster, D.L. Kreinick, R.E. Meller, M.A. Palmer, G. Ramirez, M.C. Rendina, N.T. Rider, J.P. Sikora, K.G. Sonnad, H.A. Williams
    CLASSE, Ithaca, New York, USA
  • J.Y. Chu
    CMU, Pittsburgh, Pennsylvania, USA
  • J.W. Flanagan
    KEK, Ibaraki, Japan
  • R. Holtzapple, M. Randazzo
    CalPoly, San Luis Obispo, California, USA
  
  Funding: Supported by US National Science Foundation (PHY-0734867) & Dept. of Energy (DE-FC02-08ER41538)
The study of elec­tron cloud-re­lat­ed in­sta­bil­i­ties for the CESR-TA pro­ject per­mits the ob­ser­va­tion of the in­ter­ac­tion of the elec­tron cloud with the stored beam under a va­ri­ety of ac­cel­er­a­tor con­di­tions. These mea­sure­ments are un­der­tak­en uti­liz­ing au­to­mat­ic and se­mi-au­to­mat­ic tech­niques for three basic ob­ser­va­tions: the mea­sure­ment of tune shifts of in­di­vid­u­al bunch­es along a train, the de­tec­tion of the co­her­ent self-ex­cit­ed spec­trum for each bunch with­in a train and the pulsed ex­ci­ta­tion of ei­ther the be­ta­tron dipole or head-tail mode for each in­di­vid­u­al bunch with­in the train, fol­lowed by the ob­ser­va­tion of the damp­ing of its co­her­ent mo­tion. These tech­niques are em­ployed to study the elec­tron cloud-re­lat­ed in­ter­ac­tions in a num­ber of con­di­tions, such as trains of bunch­es with low emit­tance and spaced by as lit­tle as 4 nsec be­tween bunch­es. We re­port on the most re­cent ob­ser­va­tions and re­sults.