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Technologies and Systems

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2018-05-31
13:49
Crab Cavity effects on transverse distribution evolution and tail cleaning in the HL-LHC / Baudrenghien, Philippe (CERN) ; Mastoridis, Themistoklis (California Polytechnic State Univ. (US)) ; Steeper, S (California Polytechnic State Univ. (US)) ; Tucker, D (California Polytechnic State Univ. (US)) ; Wieker, Devin (California Polytechnic State Univ. (US))
This work presents the transverse action and tune distribution evolution as a function of the Crab Cavity RF noise Power Spectral Density (PSD). [...]
CERN-ACC-NOTE-2018-0042. - 2018. - 10 p.
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2018-05-28
13:13
SRF cavity testing using a FPGA Self Excited Loop / Ben-Zvi, Ilan (Brookhaven National Laboratory (US))
This document provides a detailed description of procedures for very-high precision calibration and testing of superconducting RF cavities using digital Low-Level RF (LLRF) electronics based on Field Programmable Gate Arrays (FPGA). [...]
CERN-ACC-NOTE-2018-0039. - 2018. - 36 p.
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2018-03-26
16:45
Magnetic Field Measurements of the GOLIATH Magnet in EHN1 / Rosenthal, Marcel (CERN) ; Charitonidis, Nikolaos (CERN) ; Chatzidaki, Panagiota ; Margraf, Rachel ; Wilkens, Henric (CERN) ; Bergsma, Felix (CERN) ; Giudici, Pierre-Ange (CERN)
This note describes the measurement campaign of the magnetic field of the GOLIATH magnet conducted in 2017. [...]
CERN-ACC-NOTE-2018-0028. - 2018. - 20 p.
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2018-02-28
09:38
LHC MD 2042: Persistent Injection Oscillations / Karpov, Ivan (CERN) ; Albright, Simon (CERN) ; Argyropoulos, Theodoros (CERN) ; Baudrenghien, Philippe (CERN) ; Chapochnikova, Elena (CERN) ; Timko, Helga (CERN)
This MD note summarizes the measurements performed to study persistent longitudinal oscillations after injection into the LHC. [...]
CERN-ACC-NOTE-2018-0018. - 2018.
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2017-06-30
16:00
Comparison of coaxial higher order mode couplers for the CERN Superconducting Proton Linac study / Papke, Kai (CERN ; Rostock U.) ; Gerigk, Frank (CERN) ; Van Rienen, Ursula (Rostock U.)
Higher order modes (HOMs) may affect beam stability and refrigeration requirements of superconducting proton linacs such as the Superconducting Proton Linac, which is studied at CERN. Under certain conditions beam-induced HOMs can accumulate sufficient energy to destabilize the beam or quench the superconducting cavities. [...]
CERN-ACC-2017-0050.- Geneva : CERN, 2017 - 19 p. - Published in : Phys. Rev. Accel. Beams 20 (2017) 060401 Fulltext: PDF;

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2017-06-21
10:10
The Future of Superconducting Technology for Particle Accelerators / Yamamoto, Akira (High Energy Accelerator Research Organization (JP))
Introduction: - Colliders constructed and operated - Future High Energy Colliders under Study - Superconducting Phases and Applications - Possible Choices among SC Materials Superconducting Magnets and the Future - Advances in SC Magnets for Accelerators - Nb$_{3}$Sn for realizing Higher Field - NbTi to Nb$_{3}$Sn for realizing High Field (> 10 T) - HL-LHC as a critical milestone for the Future of Acc [...]
CERN-ACC-SLIDES-2017-0008. - 2015. - 56 p.
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2017-04-03
14:39
Measurement Report for the PS-boosterWire Scanner / Vollinger, Christine (CERN) ; Kaltenbacher, Thomas Roland (Universitaet Bern (CH)) ; Kramer, Patrick (Rheinisch-Westfaelische Tech. Hoch. (DE))
This Note discusses the EM-measurements carried out on the prototype of the PS-Booster wire scanner. [...]
CERN-ACC-NOTE-2017-0022. - 2017. - 4 p.
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2017-03-30
12:14
LHC MD 1279: Bunch Flattening in Physics / Timko, Helga (CERN) ; Baudrenghien, Philippe (CERN) ; Esteban Muller, Juan ; Shaposhnikova, Elena (CERN)
Vertex reconstruction is not accurate enough for LHCb when the bunch length in physics shrinks below about 0.9 ns. [...]
CERN-ACC-NOTE-2017-0019. - 2017. - 13 p.
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2017-03-30
12:03
LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches / Timko, Helga (CERN) ; Baudrenghien, Philippe (CERN) ; Esteban Muller, Juan ; Jaussi, Michael (CERN) ; Lasheen, Alexandre (CERN) ; Shaposhnikova, Elena (CERN)
The aim of the MD was to study the controlled longitudinal emittance blow-up applied during the ramp with bunches that are slightly shorter than operational. [...]
CERN-ACC-NOTE-2017-0018. - 2017. - 7 p.
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2017-03-30
11:33
LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs) / Esteban Muller, Juan ; shaposhnikova, Elena (CERN) ; Timko, Helga (CERN)
The aim of the MD was to measure the coupled-bunch stability from all HOM impedances, with a reduced longitudinal emittance in order to explore the HL-LHC conditions. [...]
CERN-ACC-NOTE-2017-0017. - 2017. - 6 p.
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