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6 results on '"Steffens, Erhard"'

1. LHC fixed target experiments : Report from the LHC Fixed Target Working Group of the CERN Physics Beyond Colliders Forum

Author

Barschel, Colin, Bernhard, Johannes, Bersani, Andrea, Meneguolo, Caterina Boscolo, Bruce, Roderik, Calviani, Marco, Carassiti, Vittore, Cerutti, Francesco, Chiggiato, Paolo, Ciullo, Giuseppe, Nezza, Pasquale Di, Ferro-Luzzi, Massimiliano, Fomin, Alex, Galluccio, Francesca, Garattini, Marco, Giovannozzi, Massimo, Hadjidakis, Cynthia, Kurepin, Alexeii, Kurepin, Nikolay, Lenisa, Paolo, Macrì, Mario, Vidal, Fernando Martinez, Massacrier, Laure Marie, Mazzolari, Andrea, Mereghetti, Alessio, Merli, Andrea, Mether, Lotta, Mirarchi, Daniele, Neri, Nicola, Orth, Herbert, Pappalardo, Luciano Libero, Poland, Kyle Lewis, Popovic, Branko Kosta, Pressard, Kevin, Redaelli, Stefano, Robbe, Patrick, Rossi, Roberto, Rumolo, Giovanni, Salvant, Benoît, Scandale, Walter, Steffens, Erhard, Stocchi, Achille, Topilskaya, Natalia, Vollinger(, Christine, European Organization for Nuclear Research (CERN), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de l'Accélérateur Linéaire (LAL), and CERN Yellow Reports: Monographs Published by CERN

Subjects
[PHYS]Physics [physics], Physics::Instrumentation and Detectors, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

Several fixed-target experiments at the LHC are being proposed and actively studied. Splitting of beam halo from the core by means of a bent crystal combined with a second bent crystal after the target has been suggested in order to study magnetic and electric dipole moments of short-lived particles. A similar scheme without the second crystal or other schemes with more conventional solid or gas target have been proposed to study the hadronic matter and the quark-gluon plasma, as well as to provide inputs to cosmic ray physics. Most notably, an upgrade of the existing and already productive LHCb gas target (SMOG), which would make use of a storage cell, has been proposed, designed, and extensively reviewed. The implementation in LHCb of a polarised gas target, based on the storage cell technique, was also discussed, motivated by the nucleon-spin study. The status of these proposals, their technical feasibility and impacts on the LHC machine have been studied in the LHC fixed-target working group of the Physics Beyond Collider forum at CERN. The status and outcome of these studies are presented here.

Published
2020

2. Note on the Efficiency of Differential Pumping in the LHC Polarized Gas Target (PGT)

Author

Steffens, Erhard

Subjects
Accelerators and Storage Rings
Abstract

For a sufficient density of a window-less gas target based on a storage cell, a substantial gas flow rate is required, exceeding that of UHV vacuum systems. Therefore, differential pumping has to be applied in order to limit the gas flow into neighbouring sections. Applying analytical formulae valid in the molecular regime, the on-axis flow – which can not be collimated – from the downstream end of the target tube towards the VELO vessel is estimated. It has been shown that the existing vacuum systems can cope with the flow.

Published
2019

3. LHC fixed target experiments

Author

Barschel, Colin, Bernhard, Johannes, Bersani, Andrea, Boscolo Meneguolo, Caterina, Bruce, Roderik, Calviani, Marco, Carassiti, Vittore, Cerutti, Francesco, Chiggiato, Paolo, Ciullo, Giuseppe, Di Nezza, Pasquale, Ferro-Luzzi, Massimiliano, Fomin, Alex, Galluccio, Francesca, Garattini, Marco, Giovannozzi, Massimo, Hadjidakis, Cynthia, Kurepin, Alexeii, Kurepin, Nikolay, Lenisa, Paolo, Macrì, Mario, Martinez Vidal, Fernando, Massacrier, Laure Marie, Mazzolari, Andrea, Mereghetti, Alessio, Merli, Andrea, Mether, Lotta, Mirarchi, Daniele, Neri, Nicola, Orth, Herbert, Pappalardo, Luciano Libero, Poland, Kyle Lewis, Popovic, Branko Kosta, Pressard, Kevin, Redaelli, Stefano, Robbe, Patrick, Rossi, Roberto, Rumolo, Giovanni, Salvant, Benoît, Scandale, Walter, Steffens, Erhard, Stocchi, Achille, Topilskaya, Natalia, and Vollinger, Christine

Subjects
Physics::Instrumentation and Detectors, Accelerators and Storage Rings
Abstract

Several fixed-target experiments at the LHC are being proposed and actively studied. Splitting of beam halo from the core by means of a bent crystal combined with a second bent crystal after the target has been suggested in order to study magnetic and electric dipole moments of short-lived particles. A similar scheme without the second crystal or other schemes with more conventional solid or gas target have been proposed to study the hadronic matter and the quark-gluon plasma, as well as to provide inputs to cosmic ray physics. Most notably, an upgrade of the existing and already productive LHCb gas target (SMOG), which would make use of a storage cell, has been proposed, designed, and extensively reviewed. The implementation in LHCb of a polarised gas target, based on the storage cell technique, was also discussed, motivated by the nucleon-spin study. The status of these proposals, their technical feasibility and impacts on the LHC machine have been studied in the LHC fixed-target working group of the Physics Beyond Collider forum at CERN. The status and outcome of these studies are presented here.

Published
2019

4. The SMOG2 project

Author

Di Nezza, Pasquale, Carassiti, Vittore, Ciullo, Giuseppe, Lenisa, Paolo, Pappalardo, Luciano Libero, Steffens, Erhard, Bruce, Roderik, Vasilyev, Alexander, Boscolo Meneguolo, Caterina, Bregliozzi, Giuseppe, Gebolis, Piotr Mieczysla, Iadarola, Giovanni, Mether, Lotta, Pigny, Gregory, Popovic, Branko Kosta, Salvant, Benoît, Sestak, Josef, Vollinger, Christine, and Zannini, Carlo

Subjects
Physics::Instrumentation and Detectors, Accelerators and Storage Rings
Abstract

"A proposal for an upgraded version of the existing gas injection system for the LHCb experiment (SMOG) is presented. The core idea of the project, called SMOG2, is the use of a storage cell for the injected gas to be installed upstream of the VELO detector. The main advantage of the proposed system is to increase by up to two orders of magnitude the effective target areal density, thus resulting in a significant increase of the luminosity for fixed-target collisions. Other important advantages are the possibility to inject additional gas species, including H$_2$ and D$_2$, a better defined interaction region, displaced with respect to the nominal interaction point, and thus possibly compatible with running in parallel to the collider mode (resulting in a further huge increase in luminosity). A technical design of the target system is presented together with a description of the installation procedure. Impedance properties and Electron Cloud effects have been studied for the proposed system, and the possible beam instabilities estimated. The geometry of the system has been integrated into the GEANT4 model of the LHCb detector in order to validate the target design with reliable simulation studies, and to ensure that the near-beam material budget has negligible effects in terms of beam-induced background. The loss in reconstruction efficiency with respect to SMOG for selected physics channels, due to the displaced interaction region with respect to the nominal interaction point, is found to be of the order 10%, thus largely over-compensated by the expected increase in luminosity. The installation of the system is proposed for the LHC Long Shutdown 2. This will open new physics frontiers at LHCb already from the LHC Run-3."

Published
2018

5. Spin goes Chinese

Author

Gao, Haiyan, Ma, Bo-Qiang, Miner, Richard, and Steffens, Erhard

Abstract

With SPIN2014, the International Symposium on Spin Physics visited China for the first time.

Published
2015

6. Antiproton-proton scattering experiments with polarization

Author

Barone, Vincenzo, Ma, Bo-Qiang, Goeke, Klaus, Metz, Andreas, Schweitzer, Peter, Bisplinghoff, Jens, Eversheim, Paul-Dieter, Hinterberger, Frank, Meissner, Ulf-G, Rohdjess, Heiko, Sibirtsev, Alexander, Montag, Christoph, Vogelsang, Werner, D Alesio, Umberto, Murgia, Francesco, Buttimore, Nigel H., Efremov, Anatoly, Teryaev, Oleg, Dymov, Sergey, Kadagidze, Natela, Komarov, Vladimir, Kulikov, Anatoly, Kurbatov, Vladimir, Leontiev, Vladimir, Macharashvili, Gogi, Merzliakov, Sergey, Meshkov, Igor, Serdjuk, Valeri, Sidorin, Anatoly, Smirnow, Alexander, Syresin, Evgeny, Trusov, Sergey V., Uzikov, Yuri, Volkov, Alexander, Zhuravlev, Nikolai, Ivanov, Oleg, Krivokhizhin, Victor, Meshcheryakov, Gleb, Nagaytsev, Alexander, Peshekhonov, Vladimir, Savin, Igor A., Shaikhatdenov, Binur, Shevchenko, Oleg, Yarygin, Gennady, Eyrich, Wolfgang, Kacharava, Andro, Krauss, Bernhard, Lehmann, Albert, Reggiani, Davide, Rith, Klaus, Seidel, Ralf, Steffens, Erhard, Stinzing, Friedrich, Tait, Phil, Yaschenko, Sergey, Capiluppi, Marco, Ciullo, Guiseppe, Contalbrigo, Marco, Drago, Alessandro, Ferretti-Dalpiaz, Giordano, Francesca, Lenisa, Paolo, Pappalardo, Luciano, Stancari, Giulio, Stancari, Michelle, Statera, Marco, Avetisyan, Eduard, Bianchi, Nicola, Sanctis, Enzo, Di Nezz, Pasquale, Fantoni, Alessandra, Hadjidakis, Cynthia, Hasch, Delia, Mirazita, Marco, Muccifora, Valeria, Ronchetti, Federico, Rossi, Patrizia, Barsov, Sergey, Belostotski, Stanislav, Grebenyuk, Oleg, Grigoriev, Kirill, Izotov, Anton, Jgoun, Anton, Kravtsov, Peter, Manaenkov, Sergey, Mikirtytchiants, Maxim, Mikirtytchiants, Sergey, Miklukho, Oleg, Naryshkin, Yuri, Vassiliev, Alexander, Zhdanov, Andrey, Ryckbosch, Dirk, Jiang, Yi, Lu, Hai-Jiang, Ma, Wen-Gan, Shen, Ji, Ye, Yun-Xiu, Yin, Ze-Jie, Zhang, Yong-Min, Chiladze, David, Gebel, Ralf, Engels, Ralf, Felden, Olaf, Haidenbauer, Johann, Christoph Hanhart, Hartmann, Michael, Keshelashvili, Irakli, Krewald, Siegfried, Lehrach, Andreas, Lorentz, Bernd, Martin, Sigfried, Nikolaev, Nikolai, Prasuhn, Dieter, Rathmann, Frank, Schleichert, Ralf, Seyfarth, Hellmut, Stroher, Hans, Bruncko, Dusan, Ferencei, Jozef, Musinsky, Jan, Urban, Jozef, Wiedner, Christian, Coriano, Claudio, Guzzi, Marco, Wise, Tom, Ratcliffe, Philip, Baru, Vadim, Gasparyan, Ashot, Grishina, Vera, Kondratyuk, Leonid, Kudriavtsev, Alexander, Bagulya, Alexander, Devitsin, Evgeni, Kozlov, Valentin, Terkulov, Adel, Zavertiaev, Mikhail, Bogdanov, Aleksei, Nurushev, Sandibek, Okorokov, Vitalii, Runtzo, Mikhail, Strikhanov, Mikhail, Shatunov, Yuri, Pire, Bernard, Belikov, Nikolai, Chujko, Boris, Kharlov, Yuri, Korotkov, Vladislav, Medvedev, Viktor, Mysnik, Anatoli, Prudkoglyad, Aleksey, Semenov, Pavel, Troshin, Sergey, Ukhanov, Mikhail, Chiladze, Badri, Lomidze, Nodar, Machavariani, Alexander, Nioradze, Mikheil, Sakhelashvili, Tariel, Tabidze, Mirian, Trekov, Igor, Kurdadze, Leri, Tsirekidze, George, Anselmino, Mauro, Boglione, Mariaelena, Prokudin, Alexei, Thorngren-Engblom, Pia, Liuti, Simonetta, Augustyniak, Witold, Marianski, Bohdan, Szymanowski, Lech, Trzcinski, Andrzej, Zupranski, Pawel, Akopov, Norayr, Avagyan, Robert, Avetisyan, Albert, Elbakyan, Garry, Hakopov, Zaven, Marukyan, Hrachya, and Taroian, Sargis

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