Floettmann, K.

Paper	Title	Page
MOPKF016	S2E Simulations on Jitter for European XFEL Project	336
	Y. Kim, Y. Kim, D. Son CHEP, Daegu K. Floettmann, T. Limberg DESY, Hamburg
	In order to generate stable 0.1 nm wavelength SASE source at the European X-ray laser project XFEL, we should supply high quality electron beams with constant beam characteristics to a 200 m long undulator. Generally, beam parameters such as peak current and energy spread are significantly dependent on jitter or error in RF phase and RF amplitude of superconducting accelerating modules, and magnetic field error of bunch compressors. In this paper, we describe the start-to-end simulations from the cathode to the end of linac to determine the jitter and error tolerances for the European XFEL project.
MOPKF017	New Simulations on Microbunching Instability at TTF2	339
	Y. Kim, Y. Kim, D. Son CHEP, Daegu K. Floettmann DESY, Hamburg
	Microbunching instability in the FEL driver linac can be induced by collective self-fields such as longitudinal space charge, coherent synchrotron radiation, and geometric wakefields. In this paper, we describe the first start-to-end simulations including all important collective self-fields from the cathode to the end of TTF2 linac with 1.5 million macroparticles.
MOPKF018	Injector and Bunch Compressor for the European XFEL Project	342
	Y. Kim, Y. Kim, D. Son CHEP, Daegu M. Dohlus, K. Floettmann, T. Limberg DESY, Hamburg
	For the proper operation of European XFEL project, we should supply high quality electron beams with low emittance, short bunch length, and low energy spread to a 200 m long undulator. In this paper, we describe the optimization and design concepts of the XFEL injector and bunch compressors to control the beam parameter dilution due to the microbunching instability and CSR.
MOPKF026	Conditioning and High Power Test of the RF Guns at PITZ	357
	J.H. Han, K. Abrahamyan, J. Bähr, H.-J. Grabosch, M. Krasilnikov, D. Lipka, V. Miltchev, A. Oppelt, B. Petrosyan, D. Pose, L. Staykov, F. Stephan DESY Zeuthen, Zeuthen I. Bohnet, J.-P. Carneiro, K. Floettmann, S. Schreiber DESY, Hamburg M.V. Hartrott, R. Richter BESSY GmbH, Berlin P. Michelato, L. Monaco, D. Sertore INFN/LASA, Segrate (MI)
	This paper describes the recent results of conditioning and high power tests of the photocathode RF guns at the Photo Injector Test Facility at DESY Zeuthen (PITZ). For successful operation of high gain SASE FELs, high phase space density of the electron beam is required. A high gradient in the gun has to be applied to improve the quality of the space charge dominated beams. In addition, long RF pulses and high repetition rate should be achieved to provide a high average power of FEL radiation. The first PITZ RF gun has been successfully tested at a mean power of 27 kW (900μseconds, 10 Hz, and 3 MW) and has been installed at the VUV-FEL at DESY Hamburg. Another RF gun has been installed at PITZ in January 2004 and is being conditioned for high power tests. The dark current behavior for various cathodes and for all operating schemes is also presented.
MOPKF027	Optimizing the PITZ Electron Source for the VUV-FEL	360
	M. Krasilnikov, J. Bähr, U. Gensch, H.-J. Grabosch, J.H. Han, D. Lipka, V. Miltchev, A. Oppelt, B. Petrosyan, D. Pose, L. Staykov, F. Stephan DESY Zeuthen, Zeuthen K. Abrahamyan YerPhI, Yerevan W. Ackermann, R. Cee, W.F.O. Müller, S. Setzer, T. Weiland TEMF, Darmstadt G. Asova, G. Dimitrov, I. Tsakov INRNE, Sofia I. Bohnet, J.-P. Carneiro, K. Floettmann, S. Riemann, S. Schreiber DESY, Hamburg M.V. Hartrott, E. Jaeschke, D. Krämer, R. Richter BESSY GmbH, Berlin P. Michelato, L. Monaco, C. Pagani, D. Sertore INFN/LASA, Segrate (MI) J. Rossbach Uni HH, Hamburg W. Sandner, I. Will MBI, Berlin
	The goal of the Photo Injector Test Facility at DESY Zeuthen (PITZ) is to test and optimize electron sources for Free Electron Lasers and future linear colliders. At the end of 2003 the first stage of PITZ (PITZ1) has been successfully completed, resulting in the installation of the PITZ RF gun at the Vacuum Ultra Violet - Free Electron Laser (VUV-FEL) at DESY Hamburg. The main results achieved during the PITZ1 extensive measurement program are discussed in this paper. A minimum normalized beam emittance of about 1.5 pi mm mrad for 1 nC electron bunch charge has been reached by optimizing numerous photo injector parameters, e.g. longitudinal and transverse profiles of the photocathode laser, RF phase, main and bucking solenoid current. The second stage of PITZ (PITZ2), being a large extension of the facility and its research program, has started now. Recent progress on the PITZ2 developments will be reported as well.
TUZACH01	Positron Source Options for Linear Colliders	69
	K. Floettmann DESY, Hamburg
	Linear colliders require sources delivering particle intensities much higher than sources for storage rings and even several orders of magnitude larger than the SLC positron source, the highest intensity positron source operated so far. A fundamental limitation for the intensity of a positron source is set by the thermal stress in the target. Besides improvements of conventional positron sources, i.e. sources where an electron beam creates electron position pairs in an electromagnetic cascade, new concepts based on the direct conversion of gamma radiation offer possibilities for increased particle intensities. In these sources the hard gamma radiation has to be produced either in an undulator or by backscattering of laser light off an electron beam. An additional advantage of gamma radiation based sources is the possibility to produce polarized positrons. The talk will give an overview of the developments of high intensity unpolarized and polarized positron sources for linear colliders.
	Video of talk
	Transparencies