Paper |
Title |
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TUPRO051 |
Emittance Increase and Matching along the Tomography Module at PITZ |
1144 |
SUSPSNE050 |
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- G. Kourkafas, P. Boonpornprasert, J.D. Good, M. Groß, I.I. Isaev, D.K. Kalantaryan, M. Khojoyan, M. Krasilnikov, D. Malyutin, B. Marchetti, D. Melkumyan, M. Otevřel, T. Rublack, F. Stephan, G. Vashchenko
DESY Zeuthen, Zeuthen, Germany
- G. Asova
INRNE, Sofia, Bulgaria
- G. Pathak
Uni HH, Hamburg, Germany
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The Photo Injector Test facility at DESY, Zeuthen site (PITZ), focuses on testing, characterizing and optimizing high brightness electron sources for free electron lasers. PITZ is equipped with a number of transverse emittance measurement stations, among which is the Phase Space Tomography (PST) module. A PST measurement requires a specific transport along the tomography lattice, which ideally rotates the beam in the normalized transverse phase space by 180 degrees in equidistant steps. A preceding matching section is used to provide an injection scheme that delivers the necessary beam parameters for the design transport along the tomography lattice. The high charge density and moderate energy of the electron bunch at PITZ contribute to significant space-charge forces which lead to emittance growth and consequent mismatches of the design parameters. This article presents and evaluates measurements of the emittance increase along the matching section of a 1 nC beam at 22 MeV/c under different focusing schemes.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO051
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TUPME074 |
First Experiences with the PITZ Plasma Cell for Electron Beam Self-modulation Studies |
1525 |
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- M. Groß, A. Donat, J.D. Good, M. Khojoyan, G. Koss, M. Krasilnikov, R. Schütze, F. Stephan, G. Vashchenko
DESY Zeuthen, Zeuthen, Germany
- R. Brinkmann
DESY, Hamburg, Germany
- F.J. Grüner, G. Pathak
Uni HH, Hamburg, Germany
- P. Muggli, E. Öz
MPI-P, München, Germany
- D. Richter
HZB, Berlin, Germany
- C.B. Schroeder
LBNL, Berkeley, California, USA
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The self-modulation of long particle beams in a plasma has recently gained interest in light of the ongoing preparation for the plasma wakefield acceleration experiment of the AWAKE collaboration at CERN. Instrumental to the experiment is the self-modulation of a proton beam to generate bunches short enough for producing high acceleration fields. As electron bunches are easier to handle and the underlying physics is identical, it is judicious to first gain insight into the experimental conditions of the self-modulation of long particle beams in plasma by using electron bunches before progressing to the experiment with proton bunches. The experimental demonstration of self-modulation of an electron bunch is in preparation at the Photo Injector Test facility at DESY, location Zeuthen (PITZ). In this contribution the fabrication and first experimental tests towards a Lithium plasma cell are highlighted. The distinctive feature of this plasma cell is the addition of side ports for insertion of the ionization laser beam and for diagnostics purposes.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME074
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THPRO044 |
Report on Gun Conditioning Activities at PITZ in 2013 |
2962 |
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- M. Otevřel, P. Boonpornprasert, J.D. Good, M. Groß, I.I. Isaev, D.K. Kalantaryan, M. Khojoyan, G. Kourkafas, M. Krasilnikov, D. Malyutin, D. Melkumyan, T. Rublack, F. Stephan, G. Vashchenko
DESY Zeuthen, Zeuthen, Germany
- G. Asova
INRNE, Sofia, Bulgaria
- P. Boonpornprasert, S. Rimjaem
Chiang Mai University, Chiang Mai, Thailand
- F. Brinker, K. Flöttmann, S. Lederer, B. Marchetti, S. Schreiber
DESY, Hamburg, Germany
- Ye. Ivanisenko
PSI, Villigen PSI, Switzerland
- M.A. Nozdrin
JINR, Dubna, Moscow Region, Russia
- G. Pathak
Uni HH, Hamburg, Germany
- D. Richter
BESSY GmbH, Berlin, Germany
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Recently three RF guns were prepared at the Photo Injector Test Facility at DESY, location Zeuthen (PITZ) for their subsequent operation at FLASH and the European XFEL. The gun 3.1 is a previous cavity design and is currently installed and operated at FLASH, the other two guns 4.3 and 4.4 were of the current cavity design and are dedicated to serve for the start-up of the European XFEL photo-injector. All three cavities had been dry-ice-cleaned prior their conditioning and hence showed low dark current levels. The lowest dark current level – as low as 60μA at 65MV/m field amplitude – has been observed for the gun 3.1. This paper reports in details about the conditioning process of the most recent gun 4.4. It informs about experience gained at PITZ during establishing of the RF conditioning procedure and provides a comparison with the other gun cavities in terms of the dark currents. It also summarizes the major setup upgrades, which have affected the conditioning processes of the cavities.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO044
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