Paper |
Title |
Page |
MOPAB029 |
Experimental Study of Halo Formation at ATF2 |
142 |
SUSPSIK071 |
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- R.J. Yang, P. Bambade, A. Faus-Golfe, V. Kubytskyi, S. Wallon
LAL, Orsay, France
- A. Aryshev, T. Naito
KEK, Ibaraki, Japan
- N. Fuster-Martínez
IFIC, Valencia, Spain
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For Accelerator Test Facility 2 (ATF2), as well as other high-intensity accelerators, beam halo has been an important aspect reducing the machine performance and activating the components. It is imperative to clearly understand the mechanisms that lead to halo formation and to test the avail- able theoretical models with an adequate experiment setup. In this paper, the experimental measurement of the beam halo formation from beam gas scattering is presented. The upgrading of an OTR/YAG screen monitor for future halo study is also introduced.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB029
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TUPIK075 |
ATF2 Beam Halo Collimation System Background and Wakefield Measurements in the 2016 Runs |
1864 |
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- N. Fuster-Martínez, A. Faus-Golfe
IFIC, Valencia, Spain
- P. Bambade, A. Faus-Golfe, S. Wallon, R.J. Yang
LAL, Orsay, France
- K. Kubo, T. Okugi, T. Tauchi, N. Terunuma
Sokendai, Ibaraki, Japan
- S. Kuroda
KEK, Ibaraki, Japan
- I. Podadera, F. Toral
CIEMAT, Madrid, Spain
- G.R. White
SLAC, Menlo Park, California, USA
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A single vertical beam halo collimation system has been installed in ATF2 in March 2016 to reduce the background in the IP and Post-IP region. In this paper, we present the results of an experimental program carried out during 2016 in order to demonstrate the efficiency of the vertical collimation system and measure the wakefields induced by such a system. Furthermore, a comparison of the measurements of the collimation system wakefield impact with CST PS numerical simulations and analytical calculations is also presented.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK075
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THPVA002 |
Numerical Investigation of Beam Halo From Beam Gas Scattering in KEK-ATF |
4410 |
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- R.J. Yang, P. Bambade
LAL, Orsay, France
- K. Kubo, T. Okugi, N. Terunuma, D. Zhou
KEK, Ibaraki, Japan
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To demonstrate the final focus schemes of the Future Linear Collider (FLC), the Accelerator Test Facility 2 (ATF2) at KEK is devoted to focus the beam to a RMS size of a few tens of nanometers (nm) vertically and to provide stability at the nm level at the virtual Interaction Point (IP). However, the loss of halo particles upstream will introduce background to the diagnostic instrument measuring the ultra-small beam, using a laser interferometer monitor. To help the realization of the above goals and beam operation, understanding and mitigation of beam halo are crucial. In this paper, we present the systematical simulation of beam halo formation from beam gas Coulomb scattering (BGS) in the ATF damping ring. The behavior of beam halo with various machine parameters is also discussed.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA002
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