Title :
A 3-λ/4 posi coupler for drift-tube linacs
Author :
Billen, J.H. ; Garcia, J.A. ; Potter, J.M. ; Spalek, G.
Author_Institution :
AT-1, MS H817 Los Alamos National Laboratory, Los Alamos, NM 87545 USA
Abstract :
New permanent magnets for quadrupole focusing make possible smaller drift tubes in drift-tube linacs (DTLs), resulting in higher shunt impedance. However, ordinary post couplers cannot stabilize a DTL whose drift-tube-to-wall spacing exceeds one-quarter wavelength (λ/4) by more than a few per cent for the accelerating mode frequency. We have built and tested post couplers that operate in the 3λ/4 mode. These 3λX/4 post couplers, when substituted for λ/4 couplers, had similar stabilization properties. In addition, the coupling between post and drift tube, and the post´s resonant frequency can be independently adjusted.
Keywords :
Acceleration; Capacitance; Capacitors; Coaxial components; Linear accelerators; Resonance; Resonant frequency; Testing; US Department of Energy;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.1985.4334313
