DIPAC2011 - List of Keywords (cathode)

Paper	Title	Other Keywords	Page
MOPD82	Installation for Measurements of Secondary Emission Yield and Electron Cloud Lifetime in Magnetic Field	electron, cryogenics, vacuum, simulation	236
	A.A. Krasnov, V.V. Anashin, V.K. Ovchar, V.V. Smaluk, D.P. Sukhanov BINP SB RAS, Novosibirsk, Russia
	An experimental setup for investigations of electron-surface interaction and electron cloud behavior is under commissioning at BINP. The proposed method provides direct measurements of secondary emission yield and electron clouds lifetime in the presence of strong magnetic field. In principle, the experiments can be performed at cryogenic temperatures. The experimental data will help to figure out the process of reflection of low energy electrons from a metal surface and can be useful for improvement of computer codes developed for simulation of electron clouds behavior in a cold beam pipe of particle accelerators. The structure and performance capabilities of the setup are described, first experimental results are presented.

MOPD84	Hollow Photocathode Prototype for e-Gun	laser, electron, niobium, emittance	242
	M.A. Nozdrin, N. Balalykin, A.A. Feshchenko, V. Minashkin, G. Shirkov, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia S. Gazi, J. Huran Slovak Academy of Sciences, Institute of Electrical Engineering, Bratislava, Slovak Republic
	Photocathodes are important devices for contemporary electron accelerators. Significant photocathode parameters are: fast response time, quantum efficiency, long lifetime, low emittance and minimal effect on RF properties of the accelerating system. In this paper development of the hollow photocathode conception is presented and prototype is described. Such cathode geometry allows quantum efficiency rising due to surface photoelectric effect which is concerned with normal to material surface wave electric field multiplier. Experimental results of hollow photocathode using efficiency are given (266nm wavelength, 15 ns pulse time with 1 Hz repetition rate). Backside irradiation radically simplifies laser beam targeting on emitting surface, accelerator equipment adjustment and allows photocathode working surface laser cleaning.
	Poster MOPD84 [1.505 MB]

TUPD54	Comparison of Different Radiators used to Measure the Transverse Characteristics of Low Energy Electron Beams at PITZ	electron, laser, radiation, FEL	428
	S. Rimjaem, G. Asova, J.W. Bähr, H.-J. Grabosch, M. Gross, L. Hakobyan, I.I. Isaev, Ye. Ivanisenko, M.A. Khojoyan, G. Klemz, M. Krasilnikov, M. Mahgoub, D. Malyutin, A. Oppelt, M. Otevřel, B. Petrosyan, A. Shapovalov, F. Stephan, G. Vashchenko, S. Weidinger DESY Zeuthen, Zeuthen, Germany D. Richter HZB, Berlin, Germany
	The photoinjector test facility at DESY, Zeuthen site (PITZ), has been established for developing and optimizing electron sources for linac based Free Electron Lasers (FELs). Characterizations of electron beams with maximum energies of about 25 MeV are carried out at PITZ. In order to study properties of electron beams, several diagnostic systems are applied. One of the important investigations is the study of transverse beam profiles at different beam conditions. Three screen types -YAG powder coated, optical transition radiation (OTR), and CVD-diamond screen- are used as beam profile monitors and are installed in screen stations at different locations along the beam transport line. In addition, wire scanner systems are available in the beamline for the same purpose. In this contribution a comparison of measurement results from all three screen types and the wire scanner used to characterize long pulse trains will be presented and discussed.
	Poster TUPD54 [0.193 MB]

TUPD63	Gas Electron Multipliers for the Antiproton Decelerator	vacuum, electron, antiproton, high-voltage	449
	S.C. Duarte Pinto, O.R. Jones, L. Ropelewski, J. Spanggaard, G. Tranquille CERN, Geneva, Switzerland
	The new beam profile measurement for the Antiproton Decelerator (AD) at CERN is based on a single Gas Electron Multiplier (GEM) with a 2D readout structure. This detector is very light (~0.4% X₀), and measures horizontal and vertical profiles directly in one plane. This overcomes the problems previously encountered with multi-wire proportional chambers (MWPCs) for the same purpose, where beam interactions with the detector severely affect the obtained profiles. A prototype was installed and successfully tested in late 2010, with another 3 detectors now installed in the ASACUSA beam line. This paper will provide a detailed description of the detector and discuss the initial results obtained.

TUPD85	Photoinjector Based MeV Electron Microscopy	electron, gun, emittance, laser	503
	J. Yang, K. Kan, T. Kondoh, Y. Yoshida ISIR, Osaka, Japan J. Urakawa KEK, Ibaraki, Japan
	A time-resolved MeV electron microscopy based on a photocathode rf electron gun is being developed in Osaka University to reveal the hidden dynamics of intricate molecular and atomic processes in materials. A new structure rf gun has been developed to generates a high-brightness femtosecond-bunch electron beam. The microscopy has been used successfully for the single-shot MeV electron diffraction measurement and the time-resolved measurement. The transverse emittance, bunch length and energy spread were diagnosed as the functions of the laser injection phase, the laser pulse width and the bunch charge. The growths of the emittance, bunch length and energy spread due to the rf and the space charge effects in the rf gun were investigated.

Paper

Title

Other Keywords

Page

MOPD82

Installation for Measurements of Secondary Emission Yield and Electron Cloud Lifetime in Magnetic Field

electron, cryogenics, vacuum, simulation

236

A.A. Krasnov, V.V. Anashin, V.K. Ovchar, V.V. Smaluk, D.P. Sukhanov
BINP SB RAS, Novosibirsk, Russia

An experimental setup for investigations of electron-surface interaction and electron cloud behavior is under commissioning at BINP. The proposed method provides direct measurements of secondary emission yield and electron clouds lifetime in the presence of strong magnetic field. In principle, the experiments can be performed at cryogenic temperatures. The experimental data will help to figure out the process of reflection of low energy electrons from a metal surface and can be useful for improvement of computer codes developed for simulation of electron clouds behavior in a cold beam pipe of particle accelerators. The structure and performance capabilities of the setup are described, first experimental results are presented.

MOPD84

Hollow Photocathode Prototype for e-Gun

laser, electron, niobium, emittance

242

M.A. Nozdrin, N. Balalykin, A.A. Feshchenko, V. Minashkin, G. Shirkov, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia
S. Gazi, J. Huran
Slovak Academy of Sciences, Institute of Electrical Engineering, Bratislava, Slovak Republic

Photocathodes are important devices for contemporary electron accelerators. Significant photocathode parameters are: fast response time, quantum efficiency, long lifetime, low emittance and minimal effect on RF properties of the accelerating system. In this paper development of the hollow photocathode conception is presented and prototype is described. Such cathode geometry allows quantum efficiency rising due to surface photoelectric effect which is concerned with normal to material surface wave electric field multiplier. Experimental results of hollow photocathode using efficiency are given (266nm wavelength, 15 ns pulse time with 1 Hz repetition rate). Backside irradiation radically simplifies laser beam targeting on emitting surface, accelerator equipment adjustment and allows photocathode working surface laser cleaning.

Poster MOPD84 [1.505 MB]

TUPD54

Comparison of Different Radiators used to Measure the Transverse Characteristics of Low Energy Electron Beams at PITZ

electron, laser, radiation, FEL

428

S. Rimjaem, G. Asova, J.W. Bähr, H.-J. Grabosch, M. Gross, L. Hakobyan, I.I. Isaev, Ye. Ivanisenko, M.A. Khojoyan, G. Klemz, M. Krasilnikov, M. Mahgoub, D. Malyutin, A. Oppelt, M. Otevřel, B. Petrosyan, A. Shapovalov, F. Stephan, G. Vashchenko, S. Weidinger
DESY Zeuthen, Zeuthen, Germany
D. Richter
HZB, Berlin, Germany

The photoinjector test facility at DESY, Zeuthen site (PITZ), has been established for developing and optimizing electron sources for linac based Free Electron Lasers (FELs). Characterizations of electron beams with maximum energies of about 25 MeV are carried out at PITZ. In order to study properties of electron beams, several diagnostic systems are applied. One of the important investigations is the study of transverse beam profiles at different beam conditions. Three screen types -YAG powder coated, optical transition radiation (OTR), and CVD-diamond screen- are used as beam profile monitors and are installed in screen stations at different locations along the beam transport line. In addition, wire scanner systems are available in the beamline for the same purpose. In this contribution a comparison of measurement results from all three screen types and the wire scanner used to characterize long pulse trains will be presented and discussed.

Poster TUPD54 [0.193 MB]

TUPD63

Gas Electron Multipliers for the Antiproton Decelerator

vacuum, electron, antiproton, high-voltage

449

S.C. Duarte Pinto, O.R. Jones, L. Ropelewski, J. Spanggaard, G. Tranquille
CERN, Geneva, Switzerland

The new beam profile measurement for the Antiproton Decelerator (AD) at CERN is based on a single Gas Electron Multiplier (GEM) with a 2D readout structure. This detector is very light (~0.4% X₀), and measures horizontal and vertical profiles directly in one plane. This overcomes the problems previously encountered with multi-wire proportional chambers (MWPCs) for the same purpose, where beam interactions with the detector severely affect the obtained profiles. A prototype was installed and successfully tested in late 2010, with another 3 detectors now installed in the ASACUSA beam line. This paper will provide a detailed description of the detector and discuss the initial results obtained.

TUPD85

Photoinjector Based MeV Electron Microscopy

electron, gun, emittance, laser

503

J. Yang, K. Kan, T. Kondoh, Y. Yoshida
ISIR, Osaka, Japan
J. Urakawa
KEK, Ibaraki, Japan

A time-resolved MeV electron microscopy based on a photocathode rf electron gun is being developed in Osaka University to reveal the hidden dynamics of intricate molecular and atomic processes in materials. A new structure rf gun has been developed to generates a high-brightness femtosecond-bunch electron beam. The microscopy has been used successfully for the single-shot MeV electron diffraction measurement and the time-resolved measurement. The transverse emittance, bunch length and energy spread were diagnosed as the functions of the laser injection phase, the laser pulse width and the bunch charge. The growths of the emittance, bunch length and energy spread due to the rf and the space charge effects in the rf gun were investigated.