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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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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 • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO044
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