IBIC2015 - List of Authors (Emery, J.)

Paper	Title	Page
TUPB052	Wire Scanners and Vibrations - Models and Measurements	437
	J. Herranz, B. Dehning, E. Effinger, J. Emery, A. Guerrero, C. Pereira CERN, Geneva, Switzerland A. Barjau, J. Herranz Universitat Politécnica de Catalunya, Barcelona, Spain J. Herranz Proactive Research and Development, Barcelona, Spain
	The new fast wire scanner foreseen to measure small emittance beams throughout the LHC injector chain will have a wire travelling at a speed of up to 20 m.s⁻¹, with a requested wire position measurement accuracy of the order of a few microns. The vibration of the thin carbon wires used has been identified as one of the major error sources on the wire position accuracy. In this project the most challenging and innovative development has been the wire vibrations measurement strategy based on the piezo resistive effect of the wire itself, while the deflection of the fork supporting the wire has been measured by semiconductor strain gauges. Dynamic models of the wire and fork have been created to predict the behaviour of the fork-wire assembly. This model, validated by the measurements, has then been used for optimisation of the wire-fork assembly. The contribution will discuss the measurement setup and the model development as well as their comparison. In addition it will show that this technology can easily be implemented in current operating devices without major modifications. For the first time the piezo resistive effect is used for wire vibrations measurements during the scan.
	Poster TUPB052 [2.455 MB]
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TUPB053	A High Dynamic Range Diamond Detector Readout System for the CERN Beam Wire Scanners Program	441
	J.L. Sirvent Blasco, B. Dehning, J. Emery CERN, Geneva, Switzerland A. Dieguez UB, Barcelona, Spain
	A secondary particle shower acquisition system is under design for the upgrade of CERN's beam wire scanners. The system needs to be capable of performing bunch-by-bunch synchronous measurements with an integration time of 25 ns and to cope with signal variations of up to 6 orders of magnitude. The whole dynamic range should be covered by the acquisition system with a single configuration and should have no tuneable parameters. The secondary particles are detected using a polycrystalline diamond detector with the signal digitization performed nearby with a custom front-end system, designed to resist a total ionising radiation dose up to 1 kGy in 10 years. The digital data transmission, front-end synchronization and control are performed through a bi-directional optical link operating at 4.8 Gbps using CERN's GBT protocol. For the digitization, two radiation tolerant integrator ASICs (ICECAL and QIE10) are under study.
	Poster TUPB053 [1.323 MB]
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TUPB061	Experience From the Construction of a New Fast Wire Scanner Prototype for the CERN- SPS and its Optimisation for Installation in the CERN-PS Booster	479
	R. Veness, W. Andreazza, N. Chritin, B. Dehning, J. Emery, D. Gudkov, J. Herranz, P. Magagnin, E. Piselli, S. Samuelsson CERN, Geneva, Switzerland
	A new design of wire scanner is under development for the LHC Injector Upgrade project at CERN. A prototype has been designed, built and installed in the SPS accelerator to test the concept in an operational accelerator environment. New technology has been developed and qualified for in-vacuum motor and structural components using 3D metal additive machining. This paper will describe the technology developed for this scanner and the test results to date. This prototype has recently been re-optimised to fit in the limited space available in the PS Booster rings. This design will also be presented.
	Poster TUPB061 [0.887 MB]
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WEALA02	First LHC Emittance Measurements at 6.5 TeV	562
	M. Kuhn, F. Antoniou, E. Bravin, B. Dehning, J. Emery, V. Kain, A. Langner, Y. Papaphilippou, E. Piselli, G. Trad CERN, Geneva, Switzerland
	During LHC Run 1 significant transverse emittance growth through the LHC cycle was observed. Measurements indicated most of the blow-up to occur during the injection plateau and the ramp. Intra beam scattering was one of the main drivers of emittance growth. However, finding a good wire scanner working point was difficult. Photomultiplier saturation added uncertainty on all measurements. A large discrepancy between emittances from wire scanners and luminosity was discovered but not solved. During Long Shutdown 1 the wire scanner system was upgraded with new photomultipliers. In April 2015 the LHC re-started with collision energy of 6.5 TeV per beam. This paper presents the first transverse emittance measurements through the LHC Run 2 cycle with low beam intensity. Comparisons with data from the synchrotron light monitors and the LHC experiments will be discussed and results summarized. In addition, a thorough study of wire scanner photomultiplier saturation will be presented. Finally, the emittance growth results will be compared to intra beam scattering simulations.
	Slides WEALA02 [6.752 MB]
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Paper

Title

Page

Wire Scanners and Vibrations - Models and Measurements

437

J. Herranz, B. Dehning, E. Effinger, J. Emery, A. Guerrero, C. Pereira
CERN, Geneva, Switzerland
A. Barjau, J. Herranz
Universitat Politécnica de Catalunya, Barcelona, Spain
J. Herranz
Proactive Research and Development, Barcelona, Spain

The new fast wire scanner foreseen to measure small emittance beams throughout the LHC injector chain will have a wire travelling at a speed of up to 20 m.s⁻¹, with a requested wire position measurement accuracy of the order of a few microns. The vibration of the thin carbon wires used has been identified as one of the major error sources on the wire position accuracy. In this project the most challenging and innovative development has been the wire vibrations measurement strategy based on the piezo resistive effect of the wire itself, while the deflection of the fork supporting the wire has been measured by semiconductor strain gauges. Dynamic models of the wire and fork have been created to predict the behaviour of the fork-wire assembly. This model, validated by the measurements, has then been used for optimisation of the wire-fork assembly. The contribution will discuss the measurement setup and the model development as well as their comparison. In addition it will show that this technology can easily be implemented in current operating devices without major modifications. For the first time the piezo resistive effect is used for wire vibrations measurements during the scan.

Poster TUPB052 [2.455 MB]

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TUPB053

A High Dynamic Range Diamond Detector Readout System for the CERN Beam Wire Scanners Program

441

J.L. Sirvent Blasco, B. Dehning, J. Emery
CERN, Geneva, Switzerland
A. Dieguez
UB, Barcelona, Spain

A secondary particle shower acquisition system is under design for the upgrade of CERN's beam wire scanners. The system needs to be capable of performing bunch-by-bunch synchronous measurements with an integration time of 25 ns and to cope with signal variations of up to 6 orders of magnitude. The whole dynamic range should be covered by the acquisition system with a single configuration and should have no tuneable parameters. The secondary particles are detected using a polycrystalline diamond detector with the signal digitization performed nearby with a custom front-end system, designed to resist a total ionising radiation dose up to 1 kGy in 10 years. The digital data transmission, front-end synchronization and control are performed through a bi-directional optical link operating at 4.8 Gbps using CERN's GBT protocol. For the digitization, two radiation tolerant integrator ASICs (ICECAL and QIE10) are under study.

Poster TUPB053 [1.323 MB]

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TUPB061

Experience From the Construction of a New Fast Wire Scanner Prototype for the CERN- SPS and its Optimisation for Installation in the CERN-PS Booster

479

R. Veness, W. Andreazza, N. Chritin, B. Dehning, J. Emery, D. Gudkov, J. Herranz, P. Magagnin, E. Piselli, S. Samuelsson
CERN, Geneva, Switzerland

A new design of wire scanner is under development for the LHC Injector Upgrade project at CERN. A prototype has been designed, built and installed in the SPS accelerator to test the concept in an operational accelerator environment. New technology has been developed and qualified for in-vacuum motor and structural components using 3D metal additive machining. This paper will describe the technology developed for this scanner and the test results to date. This prototype has recently been re-optimised to fit in the limited space available in the PS Booster rings. This design will also be presented.

Poster TUPB061 [0.887 MB]

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WEALA02

First LHC Emittance Measurements at 6.5 TeV

562

M. Kuhn, F. Antoniou, E. Bravin, B. Dehning, J. Emery, V. Kain, A. Langner, Y. Papaphilippou, E. Piselli, G. Trad
CERN, Geneva, Switzerland

During LHC Run 1 significant transverse emittance growth through the LHC cycle was observed. Measurements indicated most of the blow-up to occur during the injection plateau and the ramp. Intra beam scattering was one of the main drivers of emittance growth. However, finding a good wire scanner working point was difficult. Photomultiplier saturation added uncertainty on all measurements. A large discrepancy between emittances from wire scanners and luminosity was discovered but not solved. During Long Shutdown 1 the wire scanner system was upgraded with new photomultipliers. In April 2015 the LHC re-started with collision energy of 6.5 TeV per beam. This paper presents the first transverse emittance measurements through the LHC Run 2 cycle with low beam intensity. Comparisons with data from the synchrotron light monitors and the LHC experiments will be discussed and results summarized. In addition, a thorough study of wire scanner photomultiplier saturation will be presented. Finally, the emittance growth results will be compared to intra beam scattering simulations.

Slides WEALA02 [6.752 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)