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79 results on '"Ducimetiere, L."'

1. Injection and Beam Dump Systems

Author

Bracco, C., primary, Barnes, M. J., additional, Bartmann, W., additional, Calviani, M., additional, Perez, D. Carbajo, additional, Carlier, E., additional, Ducimetiere, L., additional, Frankl, M. I., additional, Goddard, B., additional, Jowett, J., additional, Lechner, A., additional, Magnin, N., additional, Marcone, A. Perillo, additional, Polzin, T., additional, Rizzoglio, V., additional, Senaj, V., additional, Vega, L., additional, Vlachodimitropoulos, V., additional, and Wiesner, C., additional

Published
2024
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2. Design of a new SPS injection system via numerical optimisation

Author

Waagaard, E., Barnes, M. J., Bartmann, W., Borburgh, J., Ducimetière, L. S., Kramer, T., Stadlbauer, T., Trubacova, P., and Velotti, F. M.

Subjects
Physics - Accelerator Physics
Abstract

The Super Proton Synchrotron (SPS) injection system plays a fundamental role to preserve the quality of injected high-brightness beams for the Large Hadron Collider (LHC) physics program and to maintain the maximum storable intensity. The present system is the result of years of upgrades and patches of a system not conceived for such intensities and beam qualities. In this study, we propose the design of a completely new injection system for the SPS using multi-level numerical optimisation, including realistic hardware assumptions. We also present how this hierarchical optimisation framework can be adapted to other situations for optimal accelerator system design.

Published
2022

3. Progress with the Upgrade of the SPS for the HL-LHC Era

Author

Goddard, B., Argyropoulos, T., Bartosik, H., Bartmann, W., Bohl, T., Caspers, F., Cornelis, K., Damerau, H., Drøsdal, L., Ducimetière, L., Garoby, R., Gourber-Pace, M., Höfle, W., Iadarola, G., Jensen, L., Kain, V., Losito, R., Meddahi, M., Mereghetti, A., Mertens, V., Mete, Ö., Montesinos, E., Müller, J. E., Papaphilippou, Y., Rumolo, G., Salvant, B., Shaposhnikova, E., Taborelli, M., Timko, H., Velotti, F., and Gianfelice-Wendt, E.

Subjects
Physics - Accelerator Physics
Abstract

The demanding beam performance requirements of the High Luminosity (HL-) LHC project translate into a set of requirements and upgrade paths for the LHC injector complex. In this paper the performance requirements for the SPS and the known limitations are reviewed in the light of the 2012 operational experience. The various SPS upgrades in progress and still under consideration are described, in addition to the machine studies and simulations performed in 2012. The expected machine performance reach is estimated on the basis of the present knowledge, and the remaining decisions that still need to be made concerning upgrade options are detailed., Comment: 3 p. Presented at 4th International Particle Accelerator Conference (IPAC 2013)

Published
2014

4. Injection and dump considerations for a 16.5 TeV HE-LHC

Author

Goddard, B., Barnes, M., Bartmann, W., Borburgh, J., Bracco, C., Ducimetière, L., Kain, V., Meddahi, M., Mertens, V., Senaj, V., and Uythoven, J.

Subjects
Physics - Accelerator Physics
Abstract

Injection and beam dumping is considered for a 16.5 TeV hadron accelerator in the current LHC tunnel, with an injection energy in the range 1 - 1.3 TeV. The present systems are described and the possible upgrade scenarios investigated for higher beam rigidity. In addition to the required equipment performance, the machine protection related aspects are explored. The expected constraints on the machine layout are also given. The technological challenges for the different equipment subsystems are detailed, and areas where R&D is necessary are highlighted., Comment: 6 pages, contribution to the EuCARD-AccNet-EuroLumi Workshop: The High-Energy Large Hadron Collider, Malta, 14 -- 16 Oct 2010; CERN Yellow Report CERN-2011-003, pp. 128-133

Published
2011

5. Injection and extraction magnets: kicker magnets

Author

Barnes, M. J., Ducimetiére, L., Fowler, T., Senaj, V., and Sermeus, L.

Subjects
Physics - Accelerator Physics
Abstract

Each stage of an accelerator system has a limited dynamic range and therefore a chain of stages is required to reach high energy. A combination of septa and kicker magnets is frequently used to inject and extract beam from each stage. The kicker magnets typically produce rectangular field pulses with fast rise- and/or fall-times, however, the field strength is relatively low. To compensate for their relatively low field strength, the kicker magnets are generally combined with electromagnetic septa. The septa provide relatively strong field strength but are either DC or slow pulsed. This paper discusses injection and extraction systems with particular emphasis on the hardware required for the kicker magnet., Comment: 26 pages, presented at the CERN Accelerator School CAS 2009: Specialised Course on Magnets, Bruges, 16-25 June 2009

Published
2011

11. LBDS Performance in RUN 2

Author

Bracco, C, Bartmann, W, Borburgh, J, Ducimetiere, L S, Carlier, E, Goddard, B, Magnin, N, Mottram, T D, Senaj, V, and Wiesner, C

Abstract

The performance of the LHC Beam Dump System (LBDS) during Run 2 beam operations are presented in terms of rate and type of failures of the extraction (MKB) and dump (MKD) kickers. New faults were also identified and they are described together with their impact on the beam distribution at the dump protection elements and the TDE assembly. Foreseen and proposed mitigations, on the MKB/MKD magnets, generators, and controls, in order to minimise possible beam intensity and brightness limitations, are addressed. The reasons and functionality of the BETS TCDQ are reminded together with the present operational constraints, which will still hold in Run 3. Main changes and issues encountered with the XPOC analysis and acknowledgment procedure are treated. Updates are given on the operational experience with the variable AGK after the accidental injection of bunches in the abort gap in 2017. The evolution of the execution and validation procedure for the asynchronous beam dump test and the further planned improvements are covered. Finally, recommendations are given for a proper scheduling of the LBDS commissioning time after LS2.

Published
2019

12. LHC beam dumping system

Author

Carlier, E, Bracco, C, Ducimetiere, L, Magnin, N, Senaj, V, Uythoven, J, and Wiesner, C

Subjects
Accelerators and Storage Rings
Abstract

During 2016 operation, all beam dump requests were properly executed by the LBDS. Nevertheless, many redundant failures in LBDS subsystems occurred, leading to LHC downtime. In this talk, some LBDS operational statistics for 2015 and 2016 are compared. Details are given on the main recurrent failures of LBDS and the foreseen corrective actions. The various Reliability Runs and Dry Runs planned for the EYETS are explained, as well as the LBDS needs for cold-checkout and recommissioning at start-up.

Published
2017

13. MKI performance during 2016 and plans for EYETS

Author

Barnes, M J, Bartmann, W, Bracco, C, Ducimetiere, L, Goddard, B, Bregliozzi, G, Cid, L Vega, Vallgren, C Yin, Vlachodimitropoulos, V, and Weterings, W

Subjects
Accelerators and Storage Rings
Abstract

Substantial upgrades were carried out to the MKI beam screen during LSl: MKI heating has not lirrrited LHC operation since LSl, and is not expected to do so during Run 2. Similarly, during LSl, the vacuum systems on the interconnects between MKl magnets were upgraded: as a result there haven't been any issues with SIS vacuum thresholds on the interconnects between adjacent MKls. However, during 2016, dynamic pressure increase on the MKISD-QS interconnect limited the number of bunches that could be injected for Beam 2. The MKIZD kicker magnet caused several issues during 2016, including limiting the length of the field pulse from August onwards and a high impedance contact from October. As a result of firrther deterioration of the high impedance contact the MKIZD was exchanged during TS3. During November the Surveillance Voltage Monitoring system interlocked the MKIZ installation on several occasions. This paper reviews the MKI performance during 2016, the plans for the EYETS and the expected performance during 2017.

Published
2017

16. LBDS and Kickers after LS1

Author

Bartmann, W, Barnes, M J, Borburgh, J, Bracco, C, Carlier, E, Dehning, B, Ducimetiere, L, Fraser, M, Goddard, B, Grishin, S, Holzer, E B, Kain, V, Magnin, N, Masi, A, Meddahi, M, Mertens, V, Patsouli, A, Senaj, V, Thiesen, H, Uythoven, J, Voumard, N, Wenninger, J, Zamantzas, C, and Zerlauth, M

Subjects
Accelerators and Storage Rings
Published
2015

17. Extra Low ENergy Antiproton (ELENA) ring and its Transfer Lines: Design Report

Author

Chohan, Vinod, Alanzeau, C, Angoletta, M E, Baillie, J, Barna, D, Bartmann, W, Belochitskii, P, Borburgh, J, Breuker, H, Butin, F, Buzio, M, Capatina, O, Carli, C, Carlier, E, Cattin, M, Dobers, T, Chiggiato, P, Ducimetiere, L, Eriksson, T, Fedemann, S, Fowler, T, Froeschl, R, Gebel, R, Gilbert, N, Hancock, S, Harasimowicz, J, Hori, M, Jorgensen, L V, Kersevan, R, Kuchler, D, Lacroix, J M, LeGodec, G, Lelong, P, Lopez-Hernandez, L, Maury, S, Molendijk, J, Morand, B, Newborough, A, Nisbet, D, Nosych, A, Oelert, W, Paoluzzi, M, Pasinelli, S, Pedersen, F, Perini, D, Puccio, B, Sanchez-Quesada, J, Schoerling, D, Sermeus, L, Soby, L, Timmins, M, Tommasini, D, Tranquille, G, Vanbavinckhove, G, Vorozhtsov, A, Welsch, C, and Zickler, T

Subjects
Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Accelerators and Storage Rings
Abstract

This Report gives a full description of the ELENA Ring to be built within the circumference of the Antiproton Decelarator (AD) Ring, in Building 193 at CERN. The ELENA ring will further decelerate the antiprotons coming from the AD at the momentum of 100 MeV/c down to 13.7 MeV/c, which corresponds to the kinetic energy of 100 keV before extracting to the physics experiments in the same building. The history of such an extra low energy antiproton ring at CERN goes a long way back, and even to the Decelerator’s previous incarnation, the Low Energy Antiproton Ring (LEAR), which came into operation in 1983. Already at that time, there were physics’ requests to further decelerate the antiprotons expected from LEAR by proposals for ELENA. Appendix I illustrates the cover pages of two such CERN documents from 1982.

Published
2014

18. Time-resolved momentum and beam size diagnostics for bunch trains with very large momentum spread

Author

Olvegard, Maja, Barnes, M. J., Ducimetiere, L., Ziemann, Volker, Olvegard, Maja, Barnes, M. J., Ducimetiere, L., and Ziemann, Volker

Abstract

We propose a novel method to measure he Lime -resolved momentum dislribulion and size of beams with very large momentum spread. To demonstrate the principle we apply the method to the beam at the end of a Compact Linear Collider decelerator, where conventional diagnostic methods are hampered by the large energy spread of the drive beam after up to 90% of its kinetic energy is converted into microwave power. Our method is based on sweeping the beam in a circular pattern to determine the momentum distribution and recording the beam size on a screen using optical transition radiation. We present an algorithm to extract the time-resolved momentum distribution. Furthermore, the beam size along the bunch train can be extracted from the image left On a screen by sweeping the beam linearly. We introduce he analysis technique and show simulation results that allow us to estimate the applicability, in addition, we present a conceptual design of the technical realization.

Published
2015
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