ERL2013 - List of Authors (Pietralla, N.)

Paper	Title	Page
PS09	Upcoming Measurements of Transverse Beam Break-Up at the Superconducting Recirculating Electron Accelerator S-DALINAC	97
	F. Hug, T. Kürzeder, N. Pietralla TU Darmstadt, Darmstadt, Germany
	Funding: Work supported by the BMBF through 05K13RDA Energy-Recovery Linacs are promising tools for providing high-current beams. Potential limitations may occur when the machine design does not sufficiently care for suppressions of the degradation of particle bunches during acceleration and beam transport, so called beam break-up. Opportunities to study these phenomena are rare. The superconducting accelerator S-DALINAC provides electron beams of up to 130 MeV for nuclear physics experiments at the university of Darmstadt since 1991. It consists of a 10 MeV injector and a 40 MeV main linac and reaches its final energy using up to two recirculation paths. The superconducting main linac houses eight 20-cell SRF cavities operated at 3 GHz and 2 K. Due to transverse beam break-up the design beam current of 20 μA could not be reached in recirculating operation mode yet, the highest stable beam current obtained so far accounts for 5 μA, which is sufficient for the nuclear physics experiments carried out at Darmstadt. On the other hand the very low threshold current for the occurence of beam break-up in addition with the recirculating linac design gives a unique opportunity to the ERL community for testing different strategies of avoiding beam break-up experimentally and to benchmark beam dynamics simulations concerning this topic. We will report on upcoming experiments which will be carried out at the S-DALINAC for that purpose. O. Yevetska et al., Nucl. Instr. Meth. A 618 (2010) 160

Paper

Title

Page

Upcoming Measurements of Transverse Beam Break-Up at the Superconducting Recirculating Electron Accelerator S-DALINAC

97

F. Hug, T. Kürzeder, N. Pietralla
TU Darmstadt, Darmstadt, Germany

Funding: Work supported by the BMBF through 05K13RDA
Energy-Recovery Linacs are promising tools for providing high-current beams. Potential limitations may occur when the machine design does not sufficiently care for suppressions of the degradation of particle bunches during acceleration and beam transport, so called beam break-up. Opportunities to study these phenomena are rare. The superconducting accelerator S-DALINAC provides electron beams of up to 130 MeV for nuclear physics experiments at the university of Darmstadt since 1991. It consists of a 10 MeV injector and a 40 MeV main linac and reaches its final energy using up to two recirculation paths. The superconducting main linac houses eight 20-cell SRF cavities operated at 3 GHz and 2 K. Due to transverse beam break-up the design beam current of 20 μA could not be reached in recirculating operation mode yet, the highest stable beam current obtained so far accounts for 5 μA, which is sufficient for the nuclear physics experiments carried out at Darmstadt*. On the other hand the very low threshold current for the occurence of beam break-up in addition with the recirculating linac design gives a unique opportunity to the ERL community for testing different strategies of avoiding beam break-up experimentally and to benchmark beam dynamics simulations concerning this topic. We will report on upcoming experiments which will be carried out at the S-DALINAC for that purpose.
* O. Yevetska et al., Nucl. Instr. Meth. A 618 (2010) 160