Ganapati Myneni
(International Symposium On Hydrogen In Matter (ISOHIM))
13/04/2016, 17:30
Superconducting RF
Poster
CBMM North America and Jefferson Lab entered into a Cooperative Research And Development Agreement to develop ingot niobium technology for efficient and economic SRF linacs in 2004. The final ingot niobium summary workshop, a third in the series, was recently hosted at Jefferson Lab Dec 4, 2015 in collaboration with CBMM(1). In this presentation I will give a brief summary of the workshop. In...
Thomas Baumgartner
(TU Wien, Atominstitut)
13/04/2016, 17:30
Technologies
Poster
A recently established collaboration between CERN and TU Wien aims at increasing the critical current density of Nb3Sn wires under the envisaged operating conditions of the Future Circular Collider by roughly 50% relative to currently available products. One of the leverage points for Nb3Sn wire optimization is the inhomogeneity of the A-15 phase, which manifests in the form of Sn...
Romain Gerard
(CERN)
13/04/2016, 17:30
Technologies
Poster
Accelerator components are traditionally fabricated using a wide range and combination of techniques: sheet metal forming, machining, vacuum brazing and welding. An alternative technique could be metal additive manufacturing (AM). AM process allows the fabrication of complex geometries with functional characteristics. AM is particularly relevant for prototypes or small series of parts, and for...
Fridolin Holdener
(shirokuma GmbH)
13/04/2016, 17:30
Infrastructure and Operation
Poster
Hybrid current leads consisting of a warm copper heat exchanger and a cold HTS sections have greatly reduced the refrigeration needs of many applications of superconductors. We have investigated whether it is possible to improve the presently used hybrid current leads. In our opinion improvements are possible by
- using 2nd generation superconductors produced by thin film deposition
-...
Dr
Reza Valizadeh
(STFC)
13/04/2016, 17:30
Accelerators
Poster
Developing a surface with low Secondary Electron Yield (SEY) is one of the principal methods of mitigating the beam-induced electron multipacting and electron cloud in high-energy charged particle accelerators [1]. Since the wall material, surface chemistry, topography and electron energy are the parameters that influence the SEY, common mitigation mechanisms are based on engineering the above...
Craig Sturzaker
(Arup)
13/04/2016, 17:30
Infrastructure and Operation
Poster
Nerea Ibarrola Subiza
(CERN)
13/04/2016, 17:30
Infrastructure and Operation
Poster
Using the currently available data a new set of topocentric datum parameters have been determined to re-establish the CERN Geodetic Reference Frame (CGRF). A new set of transformation parameters linking the CGRF to the ITRF97 (epoch 98.5) have also been established, minimizing any misalignments between them. This work will be presented, together with the additional steps that will be required...
Claudio Kotnig
(Graz University of Technology (AT))
13/04/2016, 17:30
Infrastructure and Operation
Poster
The possible operation of the FCC-hh cold mass cooling system with supercritical helium at a temperature of 4 K – 4.5 K is currently under investigation at CERN. The completely different thermodynamic and flow-mechanical properties of supercritical helium compared to pressurized superfluid helium at 1.8 K used in the LHC requires a cryogenic system based on a different concept for cooling the...
Armen Apyan
(Northwestern University)
13/04/2016, 17:30
Accelerators
Poster
The conceptual design of a beam dump for the future electron positron linear collider is presented. The critical components of the beam dump are the absorbers. We have investigated several materials for the absorbers taking into account the properties of thermal conductivity, melting temperature etc. Monte Carlo simulations were done to find the optimal absorber and its dimensions.
Laura Bandiera
(Universita di Ferrara & INFN (IT))
13/04/2016, 17:30
Accelerators
Poster
Coherent interactions of charged particles in crystals are known since the 60s and are exploited for material analysis by ion channeling and for the generation of polarized gamma-beams through coherent bremsstrahlung in the periodical crystal structure.
In the field of hadron accelerators, a collimation scheme based on channeling in bent crystals has been investigated at the CERN-SPS and,...
Prof.
Alexander Lobko
(Institute for Nuclear Problems, Belarusian State University (BY))
13/04/2016, 17:30
Experiments and Detectors
Poster
The advantages of crystal collimators over amorphous ones increase with particle energy increasing, as the coherent scattering effects are enhanced at smaller particle incidence angles with respect to crystal planes and strings typical of higher particle energies. The crystal-assisted collimation approach explored up to the present relies on particle channeling and volume reflection effects in...
Alexander Lobko
(Byelorussian State University (BY))
13/04/2016, 17:30
Experiments and Detectors
Poster
Fast physical phenomena of radiation interaction with matter that allowed capturing ionization process in scintillators with the definition about 10 ps were researched. It is shown that in e.g. lead tungstate (PWO) scintillation crystal it is possible to distinguish start of scintillation and start of electromagnetic shower by the measurements of non-linear optical absorption of femtosecond...
Dr
Mojtaba Mohammadi Najafabadi
(IPM)
13/04/2016, 17:30
Physics
Poster
In this paper, we perform a comprehensive study to probe the effects of large extra dimensions through double Higgs production in proton-proton collisions at the center-of-mass energies of 14, 33, and 100 TeV. We concentrate on the channel in which both Higgs bosons decay into the $b\bar{b}$ pair and take into account the main background contributions through realistic Monte Carlo simulations....
Magdalena Kordiaczyńska
13/04/2016, 17:30
Accelerators
Poster
Discovery of the Higgs particle at the LHC confirmed the mechanism of mass generation in the Standard Model. But that still does not eliminate the possibility of existence of models with extended scalar sectors. Those models can be constructed just by introduction of additional scalar multiplets, with or without extension of the gauge group.
Among the non-standard Higgs particles could appear...
Dr
Daniel Barna
(University of Tokyo (JP))
13/04/2016, 17:30
Accelerators
Poster
In order to avoid the damage of the dump target, the extracted beam of the FCC will be swept over its surface using dilution kickers. The optimal sweep pattern will be derived, and its basic parameters will be presented. A possible scheme to synthesize the required kicker waveforms will be shown.
Matthias Mentink
(CERN)
13/04/2016, 17:30
Experiments and Detectors
Poster
As part of the conceptual design phase of the Future Circular Collider for hadron-hadron collisions, new detector magnet designs with stored energies on the order of 50 GJ are being developed that provide sufficient bending power to track particle products resulting from 100 TeV collisions. The main designs currently under consideration feature both solenoids and dipoles, where bending power...
Alejandro Sanz Ull
(Eindhoven Technical University (NL))
13/04/2016, 17:30
Poster
For the FCC challenging requirements are set for the extraction septa magnets. A scaled up LHC-like beam dump system architecture poses many difficulties in terms of space reservation, power consumption and dissipation. To address these challenges whilst maintaining the reliability and availability of the insertion, the study will first explore steel dominated Lambertson type septum magnets...
Dr
Alexander Molodyk
(SuperOx)
13/04/2016, 17:30
Superconducting Magnets
Poster
The SuperOx group of companies is a supplier of customised 2G HTS wire. At present, the wire is manufactured jointly by SuperOx in Moscow and SuperOx Japan LLC in Tokyo.
Ultimately, independent full production cycles will be established at both locations.
SuperOx 2G HTS wire has successfully qualified for high current operation at 4.2 K in 20 T magnetic field, as targeted by CERN’s magnet...
Mike Barnes
(CERN)
13/04/2016, 17:30
Accelerators
Poster
Mario Antonelli
(Istituto Nazionale Fisica Nucleare Frascati (IT))
13/04/2016, 17:30
Experiments and Detectors
Poster
Martina Martinello
(Fermilab - IIT)
13/04/2016, 17:30
Superconducting RF
Poster
The cooldown of a superconducting cavity through its critical temperature is a crucial step in which external magnetic field might be trapped in the cavity surface, improving the radio-frequency (RF) surface losses. In particular, fast and slow cooldowns determine considerable differences in terms of trapped magnetic flux and RF cavity performance.
In order to understand the nature of these...
Mike Barnes
(CERN)
13/04/2016, 17:30
Accelerators
Poster
The Future Circular Collider (FCC) will require extremely reliable kicker systems to ensure safe injection and extraction of beam. Most existing kicker systems at CERN rely on long-established technologies which include thyratron switches and pulse-forming networks/lines (PFN/PFL). However thyratrons are susceptible to untriggered (erratic) turn-on which negatively impacts system reliability....
Lucas Brouwer
(Lawrence Berkeley National Laboratory (US))
13/04/2016, 17:30
Superconducting Magnets
Poster
The Superconducting Magnet Group at Lawrence Berkeley National Laboratory is building a series of Canted-Cosine-Theta (CCT) dipoles to test the performance of the CCT design at high field. The modeling techniques which have been developed for the design and analysis of these magnets will be presented. An integrated approach using ANSYS software will be shown which allows for magnetic,...
Oleg Malyshev
(ASTeC, Daresbury Laboratory)
13/04/2016, 17:30
Technologies
Poster
The ASTeC Vacuum Science Group has an ongoing study to improve the non-evaporable getter (NEG) coating which is currently used in many accelerators around the world. The main advantages of using NEG coatings are, an evenly distributed pumping speed, low thermal outgassing rates and low photon and electron stimulated gas desorption (PSD and ESD). The gas density along the accelerator vacuum...
Stefania Petracca
(INFN - National Institute for Nuclear Physics)
13/04/2016, 17:30
Accelerators
Poster
Readable asymptotic forms of the Electromagnetic Fields produced by a bunched beam in a realistic pipe are described and the applicability to actual machines is discussed.
Maria Ilaria Besana
(CERN)
13/04/2016, 17:30
Experiments and Detectors
Poster
The demanding goals of the FCC project require to address various aspects related to the impact of radiation on accelerators and detectors. For the FCC-hh machine, different sources have to be investigated: the 100 TeV cms proton collision debris, determining the radiation field in the experimental caverns and affecting the interaction region elements, in particular the final focus...
Claudio Kotnig
(Graz University of Technology (AT))
13/04/2016, 17:30
Infrastructure and Operation
Poster
The proton beams accelerated, bent and focussed in the FCC-hh will reach a centre of mass energy up to 100 TeV. During circulation each beam will emit synchrotron radiation and generate an image current, causing a heat transfer of about 31.4 W/m to each beam screen, which has to be extracted within a narrow temperature range (40 K – 60 K). Additionally the beam screen cooling system is...
Marco Prioli
(CERN)
13/04/2016, 17:30
Superconducting Magnets
Poster
High-field, high-current superconducting dipole magnets are currently under study for the FCC project. Within the EuroCirCol collaboration, many efforts are dedicated to the optimization of the design of the 16 T dipole magnets. In general terms, cost-efficiency and, hence, compactness, are key criteria in the design optimization. This means that an optimal design is characterized by a low...
Janusz Pawel Rodziewicz
(CERN TE/ABT)
13/04/2016, 17:30
Technologies
Poster
In pulsed power technology, high voltage triggering circuits are one of the most critical components that will determine the global performance of a system. In the systems of the future, the role of trigger systems are even more critical as they trigger more components and produce the shaped-pulses by independent timing of individual switches or switch groups.
The prospect was aimed at...
Mattia Checchin
(FNAL - IIT)
13/04/2016, 17:30
Superconducting RF
Poster
Nitrogen doping was demonstrated to be a feasible superconducting radio frequency technology in order to achieve high quality factors. The possibility of building accelerating machines operating in continuous wave or high duty factor for medium field applications, such as LCLS-II, are therefore now affordable. Still, cavities treated in such a way are usually limited to lower gradients...
Dr
Emmanuele Ravaioli
(LBNL)
13/04/2016, 17:30
Superconducting Magnets
Poster
The design of a 20 T dipole magnet constituted by an LTS outer coil and a HTS insert is analyzed from a quench protection standpoint.
Protection of such a magnet in the case of a quench brings several challenges. The very high stored energy density requires an effective mean to quickly discharge the transport current and homogeneously distribute the magnet’s energy in the winding pack after a...
Mattia Checchin
(FNAL - IIT)
13/04/2016, 17:30
Superconducting RF
Poster
Quench of superconductivity is a well-known phenomenon causing an increase in the microwave surface resistance of superconducting cavities. In this paper we investigate the nature of these quench-induced losses and present the proof that ambient magnetic field trapped at the quench spot is the single cause. We uncover the effect of different ambient field orientation and also show how the...
Anna Grassellino
13/04/2016, 17:30
Superconducting RF
Poster
Nitrogen doping is the innovative high Q SRF technology pioneered at FNAL and currently implemented by the LCLS-II project at SLAC. In order to fulfill the high quality factor requirement of this continuous wave free electron laser, the nitrogen doping R&D at Fermilab has been further intensified with aim to deeply understand how ultra-high Q-factors can be maintained throughout all the...
emanuela barzi
(Fermilab)
13/04/2016, 17:30
Superconducting Magnets
Poster
A 100 TeV center of mass energy machine in a 100 km tunnel requires dipoles with a nominal operation field of 15-16 T and appropriate operation margins, which can presently be obtained only with the Nb3Sn technology. A practical demonstration of this field in accelerator-quality magnets and reduction of magnet costs are key conditions for the realization of such a machine. A decade-long...
Prof.
Emilio Bellingeri
(SPIN CNR)
13/04/2016, 17:30
Accelerators
Poster
Among the high-temperature superconductors (HTS) Tl-cuprates stand out due to their very high critical temperatures and upper critical fields. In particular TlSr2Ca2Cu3Ox (Tl(1223)) with a Tc of about 120 K, very high Hc2 and Hirr, and moderate anisotropy is a promising material for the realization of a low surface resistance coating for the FCC beam screen. The main function of the beam...
Shahnam Gorgi Zadeh
(Universitaet Rostock (DE))
13/04/2016, 17:30
Technologies
Poster
As a part of the Future Circular Collider (FCC) study, the FCC-ee design is considered as a potential intermediate step towards the 100 TeV hadron collider. The Superconducting RF (SRF) system of the FCC-ee shall serve for electron-positron collision at different beam energies ranging from 45.5 GeV to 175 GeV. Challenges for the SRF cavity design result from operating at four different...
Katsiaryna Ilyina
(CERN)
13/04/2016, 17:30
Superconducting RF
Poster
A solution to reduce the cost of superconducting radiofrequency cavities is represented by superconducting thin film coated copper substrates. This technology has shown its potential within LEP, LHC and HIE-ISOLDE machines. In all those machines the superconducting thin film was made of $Nb$. Among the most promising future coating materials $Nb_{3}Sn$ stands as one of the best candidates....
Andreas Doblhammer
(Vienna University of Technology (AT))
13/04/2016, 17:30
Accelerators
Poster
FCC-ee is being optimised for operation at four different collision energies in the range of 90 GeV to 350 GeV. At these high energies, vast synchrotron radiation losses cause orbit offsets, creating the so-called sawtooth effect and optics distortions due to focusing errors.
In order to achieve the foreseen beam emittances, strong constraints are inflicted onto the design of the arc lattice...
Prof.
Vladimir G. Baryshevsky
(Institute for Nuclear Problems, Belarusian State University (BY))
13/04/2016, 17:30
Experiments and Detectors
Poster
The analysis shows that the phenomena of spin rotation and depolarization of high-energy particles in crystals at energies that will be available at FCC can be used to measure the anomalous magnetic moments of short-lived particles at such energies. It has also been demonstrated that for negatively-charged particles (e.g., beauty baryons), the phenomenon of spin depolarization in crystals is a...
Martina Martinello
(Fermilab - IIT)
13/04/2016, 17:30
Superconducting RF
Poster
Quality factor of superconducting radio-frequency (SRF) cavities is degraded whenever magnetic flux is trapped in the cavity walls during the cooldown. Indeed, one of the main contribution at the surface resistance of SRF cavities is the trapped flux surface resistance. In this contribution we study how the trapped flux sensitivity, defined as the trapped flux surface resistance normalized for...
