CLASSE: News and Events

Skip to content

We’ve built a new site! You can make your way there by clicking here.
If you are having trouble finding what you need, please email comms-classe@cornell.edu.

CORNELL LABORATORY FOR ACCELERATOR-BASED SCIENCES AND EDUCATION

CLASSE NEWS | 25 Aug 2011

First Cavity for the Cornell-ERL Main Linac

<noautolink>SevenCellCavitySm.jpg</noautolink>
Cornell's 7-cell superconducting RF cavity.

Cornell has completed construction of the first SRF cavity for Cornell-ERL's main linac. This cavity has been completely designed and constructed in Cornell's SRF group. The computer-design process has led to a cavity shape and a Higher-Order-Mode (HOM) absorber that allow for the large beam current in the main linac of 200mA. In addition, the cell-to-cell coupling has been optimized to make the HOM absorption minimally dependent on construction errors. This optimized cavity shape has been used to construct this first Cornell-ERL cavity from scratch, starting from bare niobium sheets. All construction steps, forming, electron-beam welding, and quality control by a CMM and by frequency test techniques have been performed in the SRF laboratory. Also, chemical cleaning procedures were applied locally.

Subsequent steps will be to measure the quality factor of this cavity at an operation field of about 16MV/m in a vertical test setup, and then to equip the cavity with its helium vessel, its coupler and HOM absorber, and to insert it into a horizontal test cryostat to see if the quality factor will remain as large as in the vertical arrangement.