IPAC2014 - List of Authors (Modena, M.)

Paper	Title	Page
TUPRO113	Design and Measurement of a Low-energy Tunable Permanent Magnet Quadrupole Prototype	1316
	B.J.A. Shepherd, J.A. Clarke, P. Wadhwa STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom A. Bartalesi, M. Modena, M. Struik CERN, Geneva, Switzerland N.A. Collomb STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	The 42 km long CLIC Drive Beam Decelerator (DBD) will decelerate beams of electrons from 2.4 GeV to 240 MeV. ASTeC in collaboration with CERN has developed a novel type of tunable permanent magnet quadrupole for the DBD. Two versions of the design were produced, for the high-energy and low-energy ends of the DBD respectively. This paper outlines the design of the low-energy version, which has a tuning range of 3.5-43 T/m. A prototype was built at Daresbury Laboratory (DL) in 2013, and extensive magnetic measurements were carried out at DL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO113
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TUPME006	Considerations for a QD0 with Hybrid Technology in ILC	1346
	M. Modena, A.V. Aloev, H. Garcia, L. Gatignon, R. Tomás CERN, Geneva, Switzerland
	The baseline design of the QD0 magnet for ILC, the International Linear Collider, is a very compact superconducting quadrupole (coil-dominated magnet). A prototype of this quadrupole is under construction at Brookhaven National Laboratory (USA). In CLIC, the Compact Linear Collider under study at CERN, we are studying another conceptual solution for the QD0. This is due to two main reasons: all the magnets of the Beam Delivery System will need to be stabilized in the nano-meter range and extremely tight alignment tolerances are required. The proposed solution, now baseline for CLIC, is a room temperature hybrid quadrupole based on electromagnetic coils and permanent magnet blocks (iron-dominated magnet). In this paper we present a conceptual design for a hybrid solution studied and adapted also to the ILC project. A special super-ferric solution is proposed to make the cross section compatible with the experiments layout. This design matches the compactness requirement with the advantages of stability and alignment precision, aspects critical also for ILC in order to achieve the design luminosity. Final Focus optics design considerations for this solution are also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME006
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TUPME007	Status of CLIC Magnets Studies and R&D	1350
	M. Modena, A.V. Aloev, E. Solodko, P.A. Thonet, A.S. Vorozhtsov CERN, Geneva, Switzerland
	Since 2009 the CERN Magnet Group (CERN-TE-MSC) started R&D activities in order to focalize the most challenging and interesting cases to be studied among the magnets needed for CLIC the Compact Linear Collider. In the last four years several theoretic studies, models and prototypes were realized mainly in two domains: magnets for the Modules, the modular elements that are composing the backbone of the two-beam linac structure of CLIC, and the Machine Detector Interface (MDI) including the Final Focus elements, and the anti-solenoid. In this paper we revise the status for the procured magnets. Among them the Drive Beam Quadrupoles, Main Beam Quadrupoles, Steering Correctors all challenging for the required compactness, performances and production size, and the QD0 final quadrupole and the close SD0 sextupole, challenging for the high performances required in terms of gradients and stability.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME007
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TUPME008	Status of the CLIC-UK R&D Programme on Design of Key Systems for the Compact Linear Collider	1354
	P. Burrows, R. Ainsworth, T. Aumeyr, D.R. Bett, N. Blaskovic Kraljevic, L.M. Bobb, S.T. Boogert, A. Bosco, G.B. Christian, L. Corner, F.J. Cullinan, M.R. Davis, D. Gamba, P. Karataev, K.O. Kruchinin, A. Lyapin, L.J. Nevay, C. Perry, J. Roberts, J. Snuverink, J.R. Towler JAI, Egham, Surrey, United Kingdom R. Ainsworth, T. Aumeyr, S.T. Boogert, A. Bosco, P. Karataev, K.O. Kruchinin, L.J. Nevay, J.R. Towler Royal Holloway, University of London, Surrey, United Kingdom P.K. Ambattu, G. Burt, A.C. Dexter, M. Jenkins, S. Karimian, C. Lingwood, B.J. Woolley Cockcroft Institute, Lancaster University, Lancaster, United Kingdom L.M. Bobb, R. Corsini, D. Gamba, A. Grudiev, A. Latina, T. Lefèvre, C. Marrelli, M. Modena, J. Roberts, H. Schmickler, D. Schulte, P.K. Skowroński, J. Snuverink, S. Stapnes, F. Tecker, R. Tomás, R. Wegner, M. Wendt, W. Wuensch CERN, Geneva, Switzerland J.A. Clarke, S.P. Jamison, P.A. McIntosh, B.J.A. Shepherd STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom N.A. Collomb, D.G. Stokes STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom L. Corner Oxford University, Physics Department, Oxford, Oxon, United Kingdom W.A. Gillespie, R. Pan, M.A. Tyrk, D.A. Walsh University of Dundee, Nethergate, Dundee, Scotland, United Kingdom R.M. Jones UMAN, Manchester, United Kingdom
	Six UK institutes are engaged in a collaborative R&D programme with CERN aimed at demonstrating key aspects of technology feasibility for the Compact Linear Collider (CLIC). We give an overview and status of the R&D being done on: 1) Drive-beam components: quadrupole magnets and the beam phase feed-forward prototype. 2) Beam instrumentation: stripline and cavity beam position monitors, an electro-optical longitudinal bunch profile monitor, and laserwire and diffraction and transition radiation monitors for transverse beam-size determination. 3) Beam delivery system and machine-detector interface design, including beam feedback/control systems and crab cavity design and control. 4) RF structure design. In each case, where applicable, we report on the status of prototype systems and performance tests with beam at the CTF3, ATF2 and CesrTA test facilities, including plans for future experiments.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME008
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TUPRI093	Determination of the Magnetic Axis of a CLIC Drive Beam Quadrupole with respect to External Alignment Targets using a Combination of WPS, CMM and Laser Tracker Measurements.	1790
	M. Duquenne, M. Anastasopoulos, D. Caiazza, G. Deferne, J. Garcia Perez, H. Mainaud Durand, M. Modena, V. Rude, J. Sandomierski, M. Sosin CERN, Geneva, Switzerland
	CERN is currently studying the feasibility of building a high energy e⁺ e⁻ linear collider: the CLIC (Compact LInear Collider). One of the engineering challenges is the pre-alignment precision and accuracy requirement on the alignment of the linac components. For example, the magnetic axis of a Drive Beam Quadrupole will need to be aligned within 20 um rms with respect to a straight reference line of alignment. The fiducialisation process which is the determination of the magnetic axis with respect to external alignment targets, that is part of this error budget, will have to be performed at an accuracy never reached before. This paper presents the strategy proposed for the fiducialisation of the Drive Beam quadrupole, based on a combination of CMM measurements, WPS measurements and Laser tracker measurements. The results obtained on a dedicated test bench will be described as well.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI093
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THPRI115	Measuring and Aligning Accelerator Components to the Nanometre Scale	4049
	N. Catalán Lasheras, H. Mainaud Durand, M. Modena CERN, Geneva, Switzerland
	First tests have shown that the precision and accuracy required for linear colliders and other future accelerators of 10 micrometers cannot be reached with a process based on independent fiducializations of single components. Indeed, the systematic and random errors at each step add up during the process with the final accuracy of each component center well above the target. A new EC-funded training network named PACMAN (a study on Particle Accelerator Components Metrology and Alignment to the Nanometer scale) will propose and develop an alternative solution integrating all the alignment steps and a large number of technologies at the same time and location, in order to gain the required precision and accuracy. The network composed of seven industrial partners and nine universities and research centers will be based at CERN where ten doctoral students will explore the technology limitations of metrology. They will develop new techniques to measure magnetic and microwave fields, optical and non-contact sensors and survey methods as well as high accuracy mechanics, nano-positioning and vibration sensors.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI115
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Design and Measurement of a Low-energy Tunable Permanent Magnet Quadrupole Prototype

1316

B.J.A. Shepherd, J.A. Clarke, P. Wadhwa
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
A. Bartalesi, M. Modena, M. Struik
CERN, Geneva, Switzerland
N.A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom

The 42 km long CLIC Drive Beam Decelerator (DBD) will decelerate beams of electrons from 2.4 GeV to 240 MeV. ASTeC in collaboration with CERN has developed a novel type of tunable permanent magnet quadrupole for the DBD. Two versions of the design were produced, for the high-energy and low-energy ends of the DBD respectively. This paper outlines the design of the low-energy version, which has a tuning range of 3.5-43 T/m. A prototype was built at Daresbury Laboratory (DL) in 2013, and extensive magnetic measurements were carried out at DL.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO113

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME006

Considerations for a QD0 with Hybrid Technology in ILC

1346

M. Modena, A.V. Aloev, H. Garcia, L. Gatignon, R. Tomás
CERN, Geneva, Switzerland

The baseline design of the QD0 magnet for ILC, the International Linear Collider, is a very compact superconducting quadrupole (coil-dominated magnet). A prototype of this quadrupole is under construction at Brookhaven National Laboratory (USA). In CLIC, the Compact Linear Collider under study at CERN, we are studying another conceptual solution for the QD0. This is due to two main reasons: all the magnets of the Beam Delivery System will need to be stabilized in the nano-meter range and extremely tight alignment tolerances are required. The proposed solution, now baseline for CLIC, is a room temperature hybrid quadrupole based on electromagnetic coils and permanent magnet blocks (iron-dominated magnet). In this paper we present a conceptual design for a hybrid solution studied and adapted also to the ILC project. A special super-ferric solution is proposed to make the cross section compatible with the experiments layout. This design matches the compactness requirement with the advantages of stability and alignment precision, aspects critical also for ILC in order to achieve the design luminosity. Final Focus optics design considerations for this solution are also presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME006

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME007

Status of CLIC Magnets Studies and R&D

1350

M. Modena, A.V. Aloev, E. Solodko, P.A. Thonet, A.S. Vorozhtsov
CERN, Geneva, Switzerland

Since 2009 the CERN Magnet Group (CERN-TE-MSC) started R&D activities in order to focalize the most challenging and interesting cases to be studied among the magnets needed for CLIC the Compact Linear Collider. In the last four years several theoretic studies, models and prototypes were realized mainly in two domains: magnets for the Modules, the modular elements that are composing the backbone of the two-beam linac structure of CLIC, and the Machine Detector Interface (MDI) including the Final Focus elements, and the anti-solenoid. In this paper we revise the status for the procured magnets. Among them the Drive Beam Quadrupoles, Main Beam Quadrupoles, Steering Correctors all challenging for the required compactness, performances and production size, and the QD0 final quadrupole and the close SD0 sextupole, challenging for the high performances required in terms of gradients and stability.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME007

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPME008

Status of the CLIC-UK R&D Programme on Design of Key Systems for the Compact Linear Collider

1354

P. Burrows, R. Ainsworth, T. Aumeyr, D.R. Bett, N. Blaskovic Kraljevic, L.M. Bobb, S.T. Boogert, A. Bosco, G.B. Christian, L. Corner, F.J. Cullinan, M.R. Davis, D. Gamba, P. Karataev, K.O. Kruchinin, A. Lyapin, L.J. Nevay, C. Perry, J. Roberts, J. Snuverink, J.R. Towler
JAI, Egham, Surrey, United Kingdom
R. Ainsworth, T. Aumeyr, S.T. Boogert, A. Bosco, P. Karataev, K.O. Kruchinin, L.J. Nevay, J.R. Towler
Royal Holloway, University of London, Surrey, United Kingdom
P.K. Ambattu, G. Burt, A.C. Dexter, M. Jenkins, S. Karimian, C. Lingwood, B.J. Woolley
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
L.M. Bobb, R. Corsini, D. Gamba, A. Grudiev, A. Latina, T. Lefèvre, C. Marrelli, M. Modena, J. Roberts, H. Schmickler, D. Schulte, P.K. Skowroński, J. Snuverink, S. Stapnes, F. Tecker, R. Tomás, R. Wegner, M. Wendt, W. Wuensch
CERN, Geneva, Switzerland
J.A. Clarke, S.P. Jamison, P.A. McIntosh, B.J.A. Shepherd
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
N.A. Collomb, D.G. Stokes
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
L. Corner
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
W.A. Gillespie, R. Pan, M.A. Tyrk, D.A. Walsh
University of Dundee, Nethergate, Dundee, Scotland, United Kingdom
R.M. Jones
UMAN, Manchester, United Kingdom

Six UK institutes are engaged in a collaborative R&D programme with CERN aimed at demonstrating key aspects of technology feasibility for the Compact Linear Collider (CLIC). We give an overview and status of the R&D being done on: 1) Drive-beam components: quadrupole magnets and the beam phase feed-forward prototype. 2) Beam instrumentation: stripline and cavity beam position monitors, an electro-optical longitudinal bunch profile monitor, and laserwire and diffraction and transition radiation monitors for transverse beam-size determination. 3) Beam delivery system and machine-detector interface design, including beam feedback/control systems and crab cavity design and control. 4) RF structure design. In each case, where applicable, we report on the status of prototype systems and performance tests with beam at the CTF3, ATF2 and CesrTA test facilities, including plans for future experiments.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME008

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPRI093

Determination of the Magnetic Axis of a CLIC Drive Beam Quadrupole with respect to External Alignment Targets using a Combination of WPS, CMM and Laser Tracker Measurements.

1790

M. Duquenne, M. Anastasopoulos, D. Caiazza, G. Deferne, J. Garcia Perez, H. Mainaud Durand, M. Modena, V. Rude, J. Sandomierski, M. Sosin
CERN, Geneva, Switzerland

CERN is currently studying the feasibility of building a high energy e⁺ e⁻ linear collider: the CLIC (Compact LInear Collider). One of the engineering challenges is the pre-alignment precision and accuracy requirement on the alignment of the linac components. For example, the magnetic axis of a Drive Beam Quadrupole will need to be aligned within 20 um rms with respect to a straight reference line of alignment. The fiducialisation process which is the determination of the magnetic axis with respect to external alignment targets, that is part of this error budget, will have to be performed at an accuracy never reached before. This paper presents the strategy proposed for the fiducialisation of the Drive Beam quadrupole, based on a combination of CMM measurements, WPS measurements and Laser tracker measurements. The results obtained on a dedicated test bench will be described as well.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI093

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI115

Measuring and Aligning Accelerator Components to the Nanometre Scale

4049

N. Catalán Lasheras, H. Mainaud Durand, M. Modena
CERN, Geneva, Switzerland

First tests have shown that the precision and accuracy required for linear colliders and other future accelerators of 10 micrometers cannot be reached with a process based on independent fiducializations of single components. Indeed, the systematic and random errors at each step add up during the process with the final accuracy of each component center well above the target. A new EC-funded training network named PACMAN (a study on Particle Accelerator Components Metrology and Alignment to the Nanometer scale) will propose and develop an alternative solution integrating all the alignment steps and a large number of technologies at the same time and location, in order to gain the required precision and accuracy. The network composed of seven industrial partners and nine universities and research centers will be based at CERN where ten doctoral students will explore the technology limitations of metrology. They will develop new techniques to measure magnetic and microwave fields, optical and non-contact sensors and survey methods as well as high accuracy mechanics, nano-positioning and vibration sensors.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI115

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)