IPAC2016 - List of Authors (Juergensen, L.E.)

Paper	Title	Page
MOPMB012	A High-Energy-Scrapersystem for the S-DALINAC Extraction - Design and Installation	101
	L.E. Jürgensen, T. Bahlo, C. Burandt, T. Kürzeder, N. Pietralla, S. Weih, J. Wissmann TU Darmstadt, Darmstadt, Germany F. Hug IKP, Mainz, Germany
	Funding: *Funded by Deutsche Forschungsgemeinschaft under grant No. SFB 634 The superconducting Darmstadt linear electron accelerator (S-DALINAC) of the Institute for Nuclear Physics at Technische Universität Darmstadt delivers electron beams in cw-mode with energies up to 130 MeV. The accelerator consists of a 10-MeV injector and a 30-MeV main linac where superconducting 3-GHz microwave cavities are operated at a temperature of 2 K for beam acceleration. With three recirculation beamlines the main linac can be used up to four times. To improve the energy spread and the energy stability of the beam a new scrapersystem has been developed and installed. It changes the extraction beam line into a dispersion-conserving chicane consisting of four dipole magnets and three scrapers. The system includes scraping of x- and y-halo in two positions as well as improving and stabilizing energy spread on a dispersive part. We will present the design of the system and report on its installation into the accelerator complex.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB012
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TUPOR025	Beam Break-up Measurements at the Recirculating Electron Accelerator S-DALINAC	1714
	T. Kürzeder, M. Arnold, L.E. Jürgensen, J. Pforr, N. Pietralla TU Darmstadt, Darmstadt, Germany F. Hug IKP, Mainz, Germany
	Funding: Supported by the German Federal Ministry for Education and Research (BMBF) under Grant No. 05K13RDA Beam break-up (BBU) instability is an important limitation to the current which can be accelerated in a superconducting linac. In particular recirculating machines and Energy Recovery Linacs have to deal with that problem. Therefore, it is important to find strategies for increasing the threshold currents of these machines. The superconducting accelerator S-DALINAC at the Technische Universität Darmstadt provides electron beams in c.w. for nuclear physics experiments since 1991. It consists of a 10 MeV injector and a 40 MeV main linac where two and eight 20-cell elliptical 3-GHz cavities are operated in a liquid helium bath at 2 K. Using two recirculation beam lines the main accelerator can be used up to 3 times. Operational experiences have shown that the design-beam current of 20 μA could not be reached. One reason is the occurrence of BBU. We will report on measurements of the threshold current at various energy settings of the S-DALINAC. The results of a first test to increase the BBU limit by using skew quadrupole magnets in the first recirculation beam line will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR025
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

A High-Energy-Scrapersystem for the S-DALINAC Extraction - Design and Installation

101

L.E. Jürgensen, T. Bahlo, C. Burandt, T. Kürzeder, N. Pietralla, S. Weih, J. Wissmann
TU Darmstadt, Darmstadt, Germany
F. Hug
IKP, Mainz, Germany

Funding: *Funded by Deutsche Forschungsgemeinschaft under grant No. SFB 634
The superconducting Darmstadt linear electron accelerator (S-DALINAC) of the Institute for Nuclear Physics at Technische Universität Darmstadt delivers electron beams in cw-mode with energies up to 130 MeV. The accelerator consists of a 10-MeV injector and a 30-MeV main linac where superconducting 3-GHz microwave cavities are operated at a temperature of 2 K for beam acceleration. With three recirculation beamlines the main linac can be used up to four times. To improve the energy spread and the energy stability of the beam a new scrapersystem has been developed and installed. It changes the extraction beam line into a dispersion-conserving chicane consisting of four dipole magnets and three scrapers. The system includes scraping of x- and y-halo in two positions as well as improving and stabilizing energy spread on a dispersive part. We will present the design of the system and report on its installation into the accelerator complex.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB012

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOR025

Beam Break-up Measurements at the Recirculating Electron Accelerator S-DALINAC

1714

T. Kürzeder, M. Arnold, L.E. Jürgensen, J. Pforr, N. Pietralla
TU Darmstadt, Darmstadt, Germany
F. Hug
IKP, Mainz, Germany

Funding: Supported by the German Federal Ministry for Education and Research (BMBF) under Grant No. 05K13RDA
Beam break-up (BBU) instability is an important limitation to the current which can be accelerated in a superconducting linac. In particular recirculating machines and Energy Recovery Linacs have to deal with that problem. Therefore, it is important to find strategies for increasing the threshold currents of these machines. The superconducting accelerator S-DALINAC at the Technische Universität Darmstadt provides electron beams in c.w. for nuclear physics experiments since 1991. It consists of a 10 MeV injector and a 40 MeV main linac where two and eight 20-cell elliptical 3-GHz cavities are operated in a liquid helium bath at 2 K. Using two recirculation beam lines the main accelerator can be used up to 3 times. Operational experiences have shown that the design-beam current of 20 μA could not be reached. One reason is the occurrence of BBU. We will report on measurements of the threshold current at various energy settings of the S-DALINAC. The results of a first test to increase the BBU limit by using skew quadrupole magnets in the first recirculation beam line will be presented.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR025

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)