Sears J.

Paper	Title	Page
MO202	Status of the Cornell ERL injector cryomodule	9
	M. Liepe, S. Belomestnykh, E. Chojnacki, V. Medjidzade, H. Padamsee, P. Quigley, J. Sears, V. Shemelin, V. Veshcherevich CLASSE, Cornell University
	Cornell University is developing and fabricating a SRF injector cryomodule for the acceleration of the high current (100 mA) beam in the Cornell ERL prototype and ERL light source. Major challenges include emittance preservation of the low energy, ultra low emittance beam, cw cavity operation, and strong HOM damping with efficient HOM power extraction. Axial symmetry of HOM absorbers, together with two symmetrically placed input couplers per cavity, avoid transverse on-axis fields, which would cause emittance growth. Fabrication of five 2-cell niobium cavities and coaxial blade tuners, ten twin high power input couplers, and six beam line HOM absorbers has finished. The injector cryomodule is presently under assembly at Cornell University with beam test planned for early 2008. In this paper we report on the cryomodule fabrication and assembly status.
	Slides(PDF)
WEP26	High power tests of input couplers for Cornell ERL injector	517
	V. Veshcherevich, S. Belomestnykh, P. Quigley, J. Reilly, J. Sears Cornell University
	RF power couplers for the ERL injector, currently under construction at Cornell University, have been fabricated. The couplers were assembled in pairs in the liquid nitrogen cryostat, built for their tests. First two prototype couplers were tested using an IOT transmitter and a resonant ring for additional power amplification. They were tested up to the goal power level of 50 kW CW and used later for tests of the first injector cavity. However, the first pair of couplers showed excessive temperature rise in some points. Therefore, minor changes in the design have been done to improve cooling. The couplers of updated design were successfully tested from a klystron up to the power level of 60 kW CW. In situ baking was implemented for coupler installed in the cryostat.