ICFA Mini Workshop on High Order Modes in Superconducting Cavities 2016

Session

HOM Damping Schemes

24 Aug 2016, 09:00

Konferenzsaal A (Warnemünde)

71. HOM Damping in Superconducting 1.4 GHz Harmonic Cavity for APS Upgrade

Sanghoon Kim (Argonne National Laboratory)

24/08/2016, 09:00

A superconducting (SC) 1.4 GHz (4th harmonic) cavity is being developed for bunch lengthening in the Advanced Photon Source Upgrade. The cavity will be excited by the average 200 mA, 15.3 nC max, and ~50 ps long electron beams with the repetition rate of 13 – 88 MHz. Proper damping of higher order modes (HOM) in this cavity is an integral part of the development. A pair of the...

72. Novel Ridge Waveguide HOM Damping Scheme for High Current SRF Cavity

wencan xu

24/08/2016, 09:30

eRHIC SRF linac generates up to 7.8 kW of HOM power per 647 MHz 5-cell BNL4 cavity, presenting a big challenge for the machine design. A ridge waveguide is a natural high pass filter and has a smaller size than the regular waveguide. A HOM damping with combination of ridge wave-guide for low frequency HOM and two room temperature HOM damper (between cryomodules) for high frequency HOM was...

79. Calculations of HOMs of a Third Harmonic Normal Conducting Cavity

Beatriz Bravo (CELLS)

24/08/2016, 10:00

ALBA is a third generation synchrotron light source of 3GeV, located at 20km from Barcelona, Spain. To a user of synchrotron radiation, the beam lifetime and beams stability is one of the most important aspects of synchrotron light. A particularly attractive option for improving the lifetime and reduce beam instabilities is to lengthen the electron bunches using a harmonic cavity. This...

78. HOM Considerations for Energy Recovery Linacs and other High-Currrent CW SRF Accelerators

Georg Hoffstaetter

24/08/2016, 11:00

73. HOM damping concepts of the bERLinPro Energy Recovery Linac Project

Axel Neumann (Helmholtz-Zentrum Berlin)

24/08/2016, 11:30

Helmholtz-Zentrum Berlin (HZB) is currently designing and building a high average current all superconducting CW driven 50 MeV ERL as a prototype to demonstrate low normalized beam emittance of 1 mm·mrad at 100mA and short pulses of about 2 ps. In this contribution an update about the progress of the ERL's contruction is given, the different types of SRF cavities forming this accelerator are...

74. HOM analysis and HOM coupler preliminary design for CEPC

Hongjuan Zheng (IHEP)

24/08/2016, 12:00

A 5 cell cavity was chosen for CEPC Preliminary Conceptual Design Report (pre-CDR) design. The higher order mode (HOM) power for each cavity is 3.6 kW. The waveguide couplers were chosen for HOMs damping. After the completion of pre-CDR, the CEPC study group starts to the conceptual design report (CDR). A 2 cell cavity design is chosen for CEPC partial double ring (PDR) scheme. The HOM power...