| 
            
                A. M. M. Todd et al., “Commissioning Status of the Fritz Haber Institute THz FEL”, in Proc. 2nd Int. Particle Accelerator Conf. (IPAC'11), San Sebastian, Spain, Sep. 2011, paper THPC106, pp. 3137-3139. | 
                                
            
             | 
            
                J. H. Park, H. Bluem, J. Rathke, T. Schultheiss, and A. M. M. Todd, “Design of Ultrafast High-Brightness Electron Source”, in Proc. 3rd Int. Particle Accelerator Conf. (IPAC'12), New Orleans, LA, USA, May 2012, paper TUPPD080, pp. 1587-1589. | 
                                
            
             | 
            
                A. M. M. Todd et al., “Commissioning of the Fritz Haber Institute Mid-IR FEL”, in Proc. 3rd Int. Particle Accelerator Conf. (IPAC'12), New Orleans, LA, USA, May 2012, paper TUPPP087, pp. 1792-1794. | 
                                
            
             | 
            
                M. P. Kelly et al., “Superconducting Harmonic Cavity for the Advanced Photon Source Upgrade”, in Proc. 6th Int. Particle Accelerator Conf. (IPAC'15), Richmond, VA, USA, May 2015, pp. 3267-3269. | 
                                
            
             | 
            
                Y. Xie et al., “Demonstration of Coaxial Coupling Scheme at 26 MV/m for 1.3 GHz TESLA-type SRF Cavities”, in Proc. 6th Int. Particle Accelerator Conf. (IPAC'15), Richmond, VA, USA, May 2015, pp. 3594-3596. | 
                                
            
             | 
            
                V. Litvinenko et al., “R&D Energy Recovery Linac at Brookhaven National Laboratory”, in Proc. 11th European Particle Accelerator Conf. (EPAC'08), Genoa, Italy, Jun. 2008, paper MOPC057, pp. 193-195. | 
                                
            
             | 
            
                A. J. Favale, M. D. Cole, E. Peterson, and J. Rathke, “Fabrication of ILC Prototype Cavities at Advanced Energy Systems, Inc.”, in Proc. 11th European Particle Accelerator Conf. (EPAC'08), Genoa, Italy, Jun. 2008, paper MOPD002, pp. 448-450. | 
                                
            
             | 
            
                H. Bluem et al., “The Fritz Haber Institute THz FEL Status”, in Proc. 32nd Int. Free Electron Laser Conf. (FEL'10), Malmö, Sweden, Aug. 2010, paper MOPA09, pp. 45-47. | 
                                
            
             | 
            
                W. Sch?Âllkopf et al., “Status of the Fritz Haber Institute THz FEL”, in Proc. 33rd Int. Free Electron Laser Conf. (FEL'11), Shanghai, China, Aug. 2011, paper TUPB30, pp. 315-317. | 
                                
            
             | 
            
                W. Sch?Âllkopf et al., “First Lasing of the IR FEL at the Fritz-Haber-Institut Berlin”, in Proc. 34th Int. Free Electron Laser Conf. (FEL'12), Nara, Japan, Aug. 2012, paper MOOB01, pp. XX-XX. |