SRF2013 - List of Keywords (emittance)

Paper	Title	Other Keywords	Page
MOIOB02	Towards a 100mA Superconducting RF Photoinjector for BERLinPro	cavity, cathode, laser, SRF	42
	A. Neumann, W. Anders, A. Burrill, A. Jankowiak, T. Kamps, J. Knobloch, O. Kugeler, P. Lauinger, A.N. Matveenko, M. Schmeißer, J. Völker HZB, Berlin, Germany G. Ciovati, P. Kneisel JLAB, Newport News, Virginia, USA R. Nietubyć NCBJ, Świerk/Otwock, Poland S.G. Schubert, J. Smedley BNL, Upton, Long Island, New York, USA J.K. Sekutowicz DESY, Hamburg, Germany V. Volkov BINP SB RAS, Novosibirsk, Russia I. Will MBI, Berlin, Germany E.N. Zaplatin FZJ, Jülich, Germany
	For BERLinPro, a 100 mA CW-driven SRF energy recovery linac demonstrator facility, HZB needs to develop a photo-injector superconducting cavity which delivers a at least 1mmmr emittance beam at high average current. To address these challenges of producing a high peak brightness beam at high repetition rate, at first HZB tested a fully superconducting injector with a lead cathode,followed now by the design of a SC cavity allowing operation up to 4 mA using CW-modified TTF-III couplers and inserting a normal conducting high quantum efficiency cathode using the HZDR-style insert scheme. This talk will present the latest results and an overview of the measurements with the lead cathode cavity and will describe the design and optimization process, the first production results of the current design and an outlook to the further development steps towards the full power version. *T. Kamps et al., Proceedings of the 2nd International Particle Accelerator Conference, San Sebastián, Spain, 2011.
	Slides MOIOB02 [7.574 MB]

MOP006	Status of the SC CW-Linac Demonstrator	cavity, linac, solenoid, status	80
	V. Gettmann, W.A. Barth, S. Jacke, S. Mickat, S. Mickat, A. Orzhekhovskaya GSI, Darmstadt, Germany M. Amberg, K. Aulenbacher, W.A. Barth, S. Jacke, S. Mickat HIM, Mainz, Germany M. Amberg, F.D. Dziuba, H. Podlech, U. Ratzinger IAP, Frankfurt am Main, Germany K. Aulenbacher IKP, Mainz, Germany
	The commissioning of the superconducting (sc) continuous wave (cw) LINAC Demonstrator, financed by the Helmholtz Institute Mainz (HIM) mainly, is planned in 2014. The aim is a “full performance test” at GSI-High Charge Injector (HLI) of a 217 MHz sc CH-Cavity, which is designed by the Institute of Applied Physics (IAP) of the University Frankfurt. Inside the cryostat a suspended frame supports the cavity embedded by two solenoids. All of these components are in fabrication. The testing environment is about to be completed. The radiation protection bunker, and the beam transport line straightforward to the GSI-HLI, comprising beam diagnostic components as well as focusing and steering magnets, has been mounted.

MOP026	Emittance Compensation for an SRF Photo Injector	solenoid, gun, SRF, cathode	151
	H. Vennekate, A. Arnold, P.N. Lu, P. Murcek, J. Teichert, R. Xiang HZDR, Dresden, Germany P. Kneisel JLAB, Newport News, Virginia, USA I. Will MBI, Berlin, Germany
	Funding: European Community-Research Infrastructure Activity under the FP7 program (EuCARD, contract number 227579), German Federal Ministry of Education and Research grant 05 ES4BR1/8 A lot of the future electron accelerator projects such like ERLs, high power FELs and also some of the new collider designs rely on the development of particle sources which provide them with high average beam currents at high repetition rates, while maintaining a low emittance. SRF photo injectors represent a promising concept to give just that, offering the option of a continuous wave operation with high bunch charges. Nevertheless, emittance compensation for these electron guns, with the goal to reach the same level as normal conducting sources, is an ongoing challenge. The poster is going to discuss several approaches for the 3-1/2-cell SRF gun installed at the accelerator facility ELBE at the Helmholtz Center Dresden-Rossendorf including the installation of a superconducting solenoid within the injector’s cryostat and present the currently used method to determine the beam’s phase space.

THP070	Analysis of High Order Modes in 1.3 GHz CW SRF Electron Linac for a Light Source	HOM, cavity, linac, dipole	1085
	A.I. Sukhanov, A. Vostrikov, V.P. Yakovlev Fermilab, Batavia, USA
	Design of a Light Source (LS) based on the continuous wave superconducting RF (CW SRF) electron linac is currently underway. This facility will provide soft coherent X-ray radiation for a broad spectrum of basic research applications. Quality of the X-ray laser radiation is affected by the electron beam parameters such as the stability of the transverse beam position and longitudinal and transverse beam emittances. High order modes (HOMs) excited in the SRF structures by a passing beam may deteriorate the beam quality and affect the beam stability. Deposition of HOM energy in the walls of SRF cavities adds to the heat load of the cryogenic system and leads to the increased cost of building and operation of the linac. In this paper we evaluate effects of HOMs in an LS CW SRF linac based on Tesla-type 9-cell 1.3 GHz cavities. We analyze non-coherent losses and resonance excitation of HOMs. We estimate heat load due to the very high frequency HOMs. We study influence of the HOMs on the transverse beam dynamics.

Paper

Title

Other Keywords

Page

MOIOB02

Towards a 100mA Superconducting RF Photoinjector for BERLinPro

cavity, cathode, laser, SRF

42

A. Neumann, W. Anders, A. Burrill, A. Jankowiak, T. Kamps, J. Knobloch, O. Kugeler, P. Lauinger, A.N. Matveenko, M. Schmeißer, J. Völker
HZB, Berlin, Germany
G. Ciovati, P. Kneisel
JLAB, Newport News, Virginia, USA
R. Nietubyć
NCBJ, Świerk/Otwock, Poland
S.G. Schubert, J. Smedley
BNL, Upton, Long Island, New York, USA
J.K. Sekutowicz
DESY, Hamburg, Germany
V. Volkov
BINP SB RAS, Novosibirsk, Russia
I. Will
MBI, Berlin, Germany
E.N. Zaplatin
FZJ, Jülich, Germany

For BERLinPro, a 100 mA CW-driven SRF energy recovery linac demonstrator facility, HZB needs to develop a photo-injector superconducting cavity which delivers a at least 1mm*mr emittance beam at high average current. To address these challenges of producing a high peak brightness beam at high repetition rate, at first HZB tested a fully superconducting injector with a lead cathode*,followed now by the design of a SC cavity allowing operation up to 4 mA using CW-modified TTF-III couplers and inserting a normal conducting high quantum efficiency cathode using the HZDR-style insert scheme. This talk will present the latest results and an overview of the measurements with the lead cathode cavity and will describe the design and optimization process, the first production results of the current design and an outlook to the further development steps towards the full power version.
*T. Kamps et al., Proceedings of the 2nd International Particle Accelerator Conference, San Sebastián, Spain, 2011.

Slides MOIOB02 [7.574 MB]

MOP006

Status of the SC CW-Linac Demonstrator

cavity, linac, solenoid, status

80

V. Gettmann, W.A. Barth, S. Jacke, S. Mickat, S. Mickat, A. Orzhekhovskaya
GSI, Darmstadt, Germany
M. Amberg, K. Aulenbacher, W.A. Barth, S. Jacke, S. Mickat
HIM, Mainz, Germany
M. Amberg, F.D. Dziuba, H. Podlech, U. Ratzinger
IAP, Frankfurt am Main, Germany
K. Aulenbacher
IKP, Mainz, Germany

The commissioning of the superconducting (sc) continuous wave (cw) LINAC Demonstrator, financed by the Helmholtz Institute Mainz (HIM) mainly, is planned in 2014. The aim is a “full performance test” at GSI-High Charge Injector (HLI) of a 217 MHz sc CH-Cavity, which is designed by the Institute of Applied Physics (IAP) of the University Frankfurt. Inside the cryostat a suspended frame supports the cavity embedded by two solenoids. All of these components are in fabrication. The testing environment is about to be completed. The radiation protection bunker, and the beam transport line straightforward to the GSI-HLI, comprising beam diagnostic components as well as focusing and steering magnets, has been mounted.

MOP026

Emittance Compensation for an SRF Photo Injector

solenoid, gun, SRF, cathode

151

H. Vennekate, A. Arnold, P.N. Lu, P. Murcek, J. Teichert, R. Xiang
HZDR, Dresden, Germany
P. Kneisel
JLAB, Newport News, Virginia, USA
I. Will
MBI, Berlin, Germany

Funding: European Community-Research Infrastructure Activity under the FP7 program (EuCARD, contract number 227579), German Federal Ministry of Education and Research grant 05 ES4BR1/8
A lot of the future electron accelerator projects such like ERLs, high power FELs and also some of the new collider designs rely on the development of particle sources which provide them with high average beam currents at high repetition rates, while maintaining a low emittance. SRF photo injectors represent a promising concept to give just that, offering the option of a continuous wave operation with high bunch charges. Nevertheless, emittance compensation for these electron guns, with the goal to reach the same level as normal conducting sources, is an ongoing challenge. The poster is going to discuss several approaches for the 3-1/2-cell SRF gun installed at the accelerator facility ELBE at the Helmholtz Center Dresden-Rossendorf including the installation of a superconducting solenoid within the injector’s cryostat and present the currently used method to determine the beam’s phase space.

THP070

Analysis of High Order Modes in 1.3 GHz CW SRF Electron Linac for a Light Source

HOM, cavity, linac, dipole

1085

A.I. Sukhanov, A. Vostrikov, V.P. Yakovlev
Fermilab, Batavia, USA

Design of a Light Source (LS) based on the continuous wave superconducting RF (CW SRF) electron linac is currently underway. This facility will provide soft coherent X-ray radiation for a broad spectrum of basic research applications. Quality of the X-ray laser radiation is affected by the electron beam parameters such as the stability of the transverse beam position and longitudinal and transverse beam emittances. High order modes (HOMs) excited in the SRF structures by a passing beam may deteriorate the beam quality and affect the beam stability. Deposition of HOM energy in the walls of SRF cavities adds to the heat load of the cryogenic system and leads to the increased cost of building and operation of the linac. In this paper we evaluate effects of HOMs in an LS CW SRF linac based on Tesla-type 9-cell 1.3 GHz cavities. We analyze non-coherent losses and resonance excitation of HOMs. We estimate heat load due to the very high frequency HOMs. We study influence of the HOMs on the transverse beam dynamics.