Title :
Design and measurements of a deflecting mode cavity for an RF separator
Author :
Bellantoni, L. ; Edwards, H.T. ; McAshan, M. ; Wanzenberg, R.
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
Abstract :
The Fermilab Main Injector can produce intense 120 GeV/c proton beams for fixed target experimentation. Two deflecting mode RF systems can be used to separate charged kaons from a momentum selected secondary beam, consisting of pions, kaons and protons, using a time of flight method. We present the RF design of a 3.9 GHz superconducting cavity which operates in the deflecting (TM110) pi-mode and the dependence of the RF parameters on the cavity shape, as determined with finite difference calculations. End cell compensation has been treated, providing cell-to-cell field flatness. First results from measurements on a prototype cavity are shown. We demonstrated that it is possible to tune the deflecting mode of a five cell cavity with bead pull measurements. Effects relating to the polarization of the modes are discussed
Keywords :
finite difference methods; particle separators; superconducting cavity resonators; Fermilab Main Injector; RF separator; cell-to-cell field flatness; deflecting TM110 pi-mode; deflecting mode RF systems; finite difference calculations; fixed target experimentation; momentum selected secondary beam; proton beams; Copper; Mesons; Particle beam injection; Particle beams; Particle separators; Polarization; Protons; Prototypes; Radio frequency; Shape measurement;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.986583
