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Low Density Materials for Beam Instrumentation Workshop
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Europe/Zurich
774/1-079 (CERN)
Alexandre Mariet
(Université de Franche-Comte (FR)),
Raymond Veness
(CERN)
Description
Purpose:
Outlines the specific requirements for different CERN applications, both current and future for these materials
Understand the state-of-the-art in the field with collaboration partners and globally and assess potential future capabilities
Agree on a strategy for simulation, material production and qualification needed to provide the materials we need.
Accommodation at CERN - please make your reservation using the following link: CERN housing
Shuttle to travel from CERN Meyrin site to CERN Prévessin site: CIRCUIT 5 - Due to work on a major road, departure from building 500 is cancelled at the moment. External participants arriving by tram (line 18) will have to walk until CERN entrance B and go straight on to building 300 to catch the shuttle. Participants accommodated at the CERN hostel can take the shuttle at building 39. You can have a look at the shuttle timetable here and at CERN maps App. to find buildings.
External participants to the event should have received an automatic email asking for personal data in order to generate the CERN access badge. Please complete the form and print your badge before arriving at CERN (mandatory action !). Thank you.
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Welcome
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1
General introductionSpeaker: Thibaut Lefevre (CERN)
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2
Workshop introductionSpeaker: Raymond Veness (CERN)
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1
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Beam instrumentation needs 1/2
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3
Screens for BTV instrumentation
Screen based instruments are commonly used in particle accelerators for beam steering, observation and size measurements. After a short introduction to this type of instrumentation deployed all along the accelerator chain at CERN, the presentation will focus on the experimental beam tests recently done on new type of screens made of nanotube material: CNT and BNNT. This was performed on the HiRadMat facility which can provide high intensity together with small beam size. Setup of the experiment and results will be discussed.
Speaker: Stephane Burger (CERN) -
4
Experience with CNT wires in high electric field
Because of the increased radioactivity in LSS2 (SPS slow extraction towards north area), new low-Z materials were studied for use in electrostatic septa. Carbon Nano Tubes wire (CNT) was the first candidate to be studied. A test facility was built to assess the behaviour of the CNT wires in high field conditions.
Speaker: Louise Olivia Jorat (CERN) -
5
Use of CNT fibers for the beam instrumentation with wire-scanners
Wire-scanners are instruments frequently used in particle accelerators for the measurement of the transverse profile. The challenge of increasing brightness necessitates innovative solutions. Carbon fibers currently used will not respond to the new boundaries of future projects. Carbon nanotube (CNT) fibers could offer new materials with these materials in wire-scanner construction enhances performance and accuracy, addressing the demands of higher beam intensity. This presentation shows the preliminary results of the irradiation at high energy and high intensity of CNT fibers.
Speaker: Alexandre Mariet (CERN)
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3
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6
Chair conclusionSpeaker: Raymond Veness (CERN)
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Coffee break
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Beam instrumentation needs 2/2
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7
Nanomaterials and CNTs in ISOLDE targetry
CERN-ISOLDE is a facility dedicated to the production of radioactive ion beams (RIBs) for physics research.
The quality and quantity of available RIBs is governed by the choice of target materials and their microstructural properties.
In this contribution we highlight the potential of nanomaterials and carbon nanotubes in target material development for more efficient isotope extraction and improved RIB yields.
We will give an overview over past experiences as well as current developments.Speaker: Dr Simon Thomas Stegemann (CERN) -
8
Use of low-density graphitic materials for beam-intercepting devices
The presentation will cover the use of graphitic materials in beam intercepting devices.
Particular focus will be given to the LHC external dump (TDE), characterising the different materials that are employed in the dump and those that are under study for the HL-LHC upgrade.
A detailed breakdown of the R&D program for this application will cover the simulation and experimental techniques as well as the post-irradiation examinations and results.
Finally, the upcoming procurement efforts are going to be detailed, together with the related strategy for material qualification and quality assurance.Speaker: Nicola Solieri (CERN) -
9
How high-power accelerators damage thin wires
Thin targets are used in high-power accelerators because of low energy deposited by the beam and fast cooling.
Extreme beams test the limits to those structures. A series of damage tests done on CERN machines on carbon fiber targets used in wire scanners is presented. Damage events observed on PSI machines on carbon fibers and molybdenum wires are discussed.Speaker: Mariusz Sapinski (Paul Scherrer Institute (CH))
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7
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10
Chair conclusionSpeaker: Thierry Stora (CERN)
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Lunch break
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Material procurement
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11
1D and 2D Nanomaterials Fabrication, Purification and Utilisation
The presentation will provide an overview of the 1D and 2D nanomaterials synthesis capabilities at the University of Bath and some initial ideas to develop carbon nanotube-based ropes for CERN’s wire scanner application.
Speaker: Davide Mattia (Bath) -
12
Free-standing CNT membranes
Canatu’s carbon nanotube membrane is the world’s thinnest and strongest CNT membrane, exhibiting high transmittance (>97%T at EUV/X-ray), low flare and high thermal stability (>1500°C). Membrane made with Canatu carbon nanotubes have extraordinary mechanical, thermal and optical properties, making them ideal for extreme conditions, such as EUV pellicles in the semiconductor industry and X-ray windows in space applications.
Speaker: Ilkka Varjos (Canatu) -
13
Ultra-long carbon nanotube forest via in situ supplements of iron and aluminum vapor sources
A carbon nanotube forest with a length of 14 cm grew with an average growth rate of 1.5 μm s−1 and a growth lifetime of 26 h. Several key factors to realize this unprecedented long growth such as catalyst conditions, growth conditions in chemical vapor deposition, and reactor system were clarified. The long carbon nanotube forest enabled macroscopic measurements of the tensile and electrical properties of the carbon nanotube wires.
Speaker: Hisashi Sugime (Kindai) -
14
High-Performance Galvorn CNT Materials
DEXMAT produces Galvorn CNT materials using a proprietary fluid phase production method. This method produces CNTF in which the CNT molecules are highly aligned along the fiber axis, resulting in high strength, electrical conductivity, and thermal conductivity along the axis of the fiber. Compared to a copper wire with the same diameter, a CNTF produced by this method has 12 times higher strength, more than 6 times lower density, at least 25 times higher flexure tolerance, and up to 50% higher thermal conductivity.
Speaker: Dmitri Tsentalovich (Dexmat)
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11
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15
Chair conclusionSpeaker: Dr Stefano Sgobba (CERN)
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Coffee break
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Manipulation
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16
Presentation of CMNR's µRobotex station, handling carbon nanotubes and measuring flexoelectricity
As part of a study on the properties of carbon nanotubes, we are going to briefly present the micro-Robotex station, which consists of a Zeiss Auriga 60 scanning electron microscope, on which are installed a Focused Ion Beam-FIB from Orsay Physics, a Gas Injection System-GIS from Oxford Instrument, and a robot with 6 degrees of freedom installed inside the vacuum chamber. By manufacturing suitable tools, we can present a preliminary study to detect and characterise the principle of flexoelectricity of CNT using brightness measurements. Some key results from the micro-Robortex station will also be presented.
Speaker: Jean-Yves Rauch (Université de Franche-Comté) -
17
Microscopic characterization activity at CERN
The microscopy team at CERN is devoted to providing material characterization including topographical imaging, morphology, phase identification and chemical analysis through the utilization of Scanning Electron Microscopy (SEM), Focused Ion Beam (FIB)-SEM and X-ray Diffraction (XRD).
Material characterization is carried out on a wide range of materials with emphasis on metals and alloys, which display great compatibility with electron microscopy apparatus, along with ceramics, composites and thin film specimens. We will present specific examples of how these techniques are utilized to extract the maximum possible information from samples that are either being installed or extracted from the detectors and accelerator complex.Speaker: Ana Teresa Perez Fontenla (CERN)
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16
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18
Chair conclusionSpeaker: Michel Devel (SupMicroTech)
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Conclusion / information
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Welcome
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Characterization
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19
Nanoscale materials by gas-phase FCCVD synthesis: structure and properties
Floating catalyst CVD is the universal route to grow 1D nanoparticles, such as nanotubes and nanowires, in the gas phase and collect them in the form of freestanding nanotextiles, non-woven mats, and fibres. Due to high aspect ratio of constituent nanoparticles and network structure, macromaterials of CNTs exhibit high mechanical and electrical properties coupled with high flexibility and inherent damage-tolerance. The talk will give an overview on the structure and properties of CNT-based materials and recent achievements of IMDEA Materials on synthesis of nanotextiles of different chemistries.
Speaker: Anastasiia Mikhalchan (IMDEA) -
20
Mechanical and physical characterization of small scale specimens
MME Mechanical and Materials laboratories undertake thermophysical and mechanical measurements for a wide range of components and devices at CERN, and uses state-of-the-art techniques to provide the necessary inputs for the analyses, and validate them experimentally. Thus, these laboratories constitute a crucial resource in supporting critical equipment throughout its lifecycle, from conception to commissioning and operation monitoring.
Speakers: Ignacio Aviles Santillana (CERN), Oscar Sacristan De Frutos (CERN) -
21
Mechanical characterisation of braided carbon nanotubes for wire scanners
The increased luminosity of future particle accelerators will require improvements to beam instrumentation techniques and materials. A promising route for future wire scanners is the use of braided carbon nanotubes which have an exceptional combination of mechanical and thermal characteristics. This study outlines initial investigations into the effects of braiding on mechanical performance and routes to reliably model these systems.
Speaker: Alexander Lunt (University of Bath (GB))
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19
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22
Chair conclusionSpeaker: Dr Marco Calviani (CERN)
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Coffee break
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Simulations
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23
Simulation of beam interaction with thin wires - FLUKA and COMSOL codes
Calculation of the energy loss of an incident beam in a thin wire is the first step if we want to assess the thermal behaviour of the wire during the scan process. We will present these calculations with the FLUKA code and the choice of key parameters to get realistic results. Simulations at specific energies for SPS (450 GeV), LHC (7 TeV) and FCC (50 TeV) were performed with different densities and C-Fe weight content and will be discussed. Thermal behaviour will also be quickly broach.
Speaker: Jean-Emmanuel Groetz (Chrono-Environnement) -
24
Thermal simulation for wire-scanners
Low-density materials as targets for wire scanners demonstrate favorable thermal behavior. Simulations with the PyTT package are carried out to study the secondary emission yield and the maximum temperature for carbon nanotube and carbon fibre wire for the PSI Main Ring Cyclotron and HL-LHC beams. These results show that with low-density materials, the maximum temperature reached is lower due to the smaller amount of material and, for the PSI beam, the thermionic emission current, which represents a major perturbation to the measured signal, is completely suppressed.
Speaker: Manon Boucard (EPFL - Ecole Polytechnique Federale Lausanne (CH))
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23
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25
Chair conclusion / discussionSpeaker: Federico Roncarolo (CERN)
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Wrap up / next steps discusisonConveners: Alexander Lunt (University of Bath (GB)), Federico Roncarolo (CERN), Dr Marco Calviani (CERN), Raymond Veness (CERN), Dr Stefano Sgobba (CERN), Thierry Stora (CERN)
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Lunch break
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