| Paper |
Title |
Page |
| MOPLT121 |
Water Flow Vibration Effect on the NLC RF Structure-girder System
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821 |
| |
- C. Boffo, T.T. Arkan, E. Borissov, H. Carter
Fermilab, Batavia, Illinois
- F. Le Pimpec, A. Seryi
SLAC, Menlo Park, California
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In order to meet the vibration budget for the Next Linear Collider main Linac components, the vibration sources in the NLC girder are being studied. The activity is focused on the vibration induced by the cooling water flow for the 60 cm long accelerating copper structures. Understanding the vibration in the structures will enable us to push forward the design of the interface between the structures and the quadrupoles. This paper reports on the ongoing work and presents results from experimental data as well as finite element simulations.
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| MOPLT138 |
Vibrational Stability of GLC/NLC Linear Collider: Status and R&D Plans
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863 |
| |
- A. Seryi, F. Asiri, F. Le Pimpec
SLAC, Menlo Park, California
- K. Fujii, T. Matsuda, T. Tauchi, H. Yamaoka
KEK, Ibaraki
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Luminosity stability of the X-band linear collider will be provided by beam-based train by train steering feedbacks in the linac and at the IP, optional active stabilization of the final doublet, being developed to counteract possible excessive vibration of the detector, and optional fast intratrain feedback that would allow delivering major part of the luminosity while other systems are being commissioned. Control and reduction of the beam jitter originating from vibration of collider components is part of our strategy described in this paper.
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| WEPKF080 |
Secondary Electron Yield Measurements from Thin Surface Coatings for NLC Electron Cloud Reduction
|
1789 |
| |
- F. Le Pimpec, F. King, R.E. Kirby, M.T.F. Pivi
SLAC, Menlo Park, California
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In the beam pipe of the positron damping ring of the Next Linear Collider, electrons will be created by beam interaction with the surrounding vacuum chamber wall and give rise to an electron cloud. Several solutions are possible for avoiding the electron cloud, without changing the beam bunch structure or the diameter of the vacuum chamber. Some of the currently available solutions include reducing residual gas ionization by the beam, minimizing photon-induced electron production, and lowering the secondary electron yield (SEY) of the chamber wall. We will report on recent SEY measurements performed at SLAC on TiN coatings and TiZrV non-evaporable getter thin films.
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| WEPKF085 |
Secondary Electron Emission Measurements for TiN Coating on Stainless Steel of SNS Accumulator Ring Vacuum Chamber
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1804 |
| |
- P. He, H.-C. Hseuh, R. Todd
BNL, Upton, Long Island, New York
- B. Henrist, N. Hilleret
CERN, Geneva
- S. Kato, M. Nishiwaki
KEK, Ibaraki
- R.E. Kirby, F. Le Pimpec, M.T.F. Pivi
SLAC, Menlo Park, California
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BNL is responsible for the design and construction of the US Spallation Neutron Source (SNS) accumulator ring. Titanium Nitride(TiN) coating on the stainless steel vacuum chamber of the SNS accumulator ring is needed to reduce undesirable resonant multiplication of electrons. The Secondary Electron Yield(SEY) of TiN coated chamber material has been measured after coated samples were exposed to air and after electron and ion conditioning. We are reporting about the TiN coating system setup at BNL and SEY measurements results performed at CERN, SLAC and KEK. We also present updated electron-cloud simulation results for the SNS accumulator assuming different SEY values.
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