FIRST TEST OF THE CORNELL SINGLE-CAVITY HORIZONTAL CRYOMODULE *

A single-cavity horizontal test cryomodule (HTC) ha s been designed and fabricated recently at Cornell University for ERL project. This cryomodule is a shortened version of the full injector cryomodule, housing five superconducting cavities. It serves as a test bench for new design features and for testing fully dressed t wo-cell ERL injector cavities. The cryostat design has been optimized for precise cavity alignment, good magnet ic shielding, and high cryogenic loads from the RF cav ities, input couplers, and HOM loads. The HTC was made long enough so in the future it can accommodate longer, multicell cavities of the ERL main linac. In this p aper we report on results from the first full test of the H TC, including RF system and superconducting cavity performance, cryomodule studies and operation of a new 2 K cryogenic system.