| Paper |
Title |
Page |
| MOPKF045 |
Cesium Telluride and Metals Photoelectron Thermal Emittance Measurements Using a Time-of-flight Spectrometer
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408 |
| |
- D. Sertore, D. Favia, P. Michelato, L. Monaco, P. Pierini
INFN/LASA, Segrate (MI)
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The thermal emittance of photoemitted electrons in an RF gun is a crucial parameter for short wavelength FELs and future high luminosity electron colliders. An estimate of the thermal emittance of semiconductor and metal samples, commonly used as photocathodes, has been assessed using a Time-Of-Flight spectrometer. In this paper we present the analysis, based on angle resolved photoemission measurements, of both the cesium telluride (Cs2Te) photocathode films as used at the TESLA Test Facility, and polycrystalline metals. These latter measurements, at different laser wavelengths, are used to validate both our experimental apparatus and the thermal emittance reconstruction technique developed.
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| TUPKF026 |
RF Tests of the Beta=0.5 Five Cell TRASCO Cavities
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1024 |
| |
- A. Bosotti, C. Pagani, P. Pierini
INFN/LASA, Segrate (MI)
- J.P. Charrier, B. Visentin
CEA/DSM/DAPNIA, Gif-sur-Yvette
- G. Ciovati, P. Kneisel
Jefferson Lab, Newport News, Virginia
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Two complete 5 cell superconducting cavities at b=0.5 have been designed and fabricated. The cavities have been designed to minimize peak electric and magnetic fields, with a goal of 8.5 MV/m of accelerating gradient, at a Q > 5E9. The cavities are currently in the testing stage and the results of the vertical tests will be presented at this conference.
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| TUPLT057 |
Beam Dynamics Studies for the Fault Tolerance Assessment of the PDS-XADS Linac Design
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1282 |
| |
- J.-L. Biarrotte
IPN, Orsay
- M. Novati, P. Pierini
INFN/LASA, Segrate (MI)
- H. Safa, D. Uriot
CEA/DSM/DAPNIA, Gif-sur-Yvette
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In order to meet the high availability/reliability required by the PDS-XADS design the accelerator needs to implement, to the maximum possible extent, a fault tolerance strategy that would allow beam operation in the presence of most of the envisaged faults that could occur in its beamline components. In this work we report the results of beam dynamics simulations performed to characterize the effects of the faults of the main linac components (cavities, deflecting and focusing magnets, …) on the beam parameters. The outcome of this activity is the definition of the possible corrective and preventive actions that could be conceived (and implemented in the system) in order to guarantee the fault tolerance characteristics of the accelerator.
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| WEPKF035 |
Analysis of the Cold Mass Displacements at the TTF
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1681 |
| |
- A. Bosotti, C. Pagani, P. Pierini
INFN/LASA, Segrate (MI)
- R. De Monte, M. Ferianis
ELETTRA, Basovizza, Trieste
- R. Lange
DESY, Hamburg
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Few of the TTF cryomodules have been equipped with wire position monitors (WPM) in order to monitor on line the displacements of the cold mass to verify alignment stability and reproducibility . Based on the operation experience of the first prototypical cryomodules, equipped with up to 36 WPMs distributed in two strings, on the last generation cryomodules a single string of 7 sensors has been installed. Here we review and analyze the data collected so far to prove that the the proposed cryomodule design is consistent with the TESLA alignment requirements.
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