107 Works

CERN Proceedings, Vol 1 (2017): CERN-BINP Workshop for Young Scientists in e+e- Colliders

CERN Proceedings
Geneva, Switzerland, 22--25 August 2016 Edited by V. Brancolini and L. Linssen CERN-Proceedings-2017-001, ISBN 978-92-9083-451-9 (print), ISBN 978-92-9083-452-6 (PDF) This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement no. 654166.

CERN Proceedings, Vol 1 (2018): Proceedings of the PHOTON'17 Conference

CERN Proceedings
Geneva, Switzerland, 22 - 26 May 2017 Edited by David d'Enterria, Albert de Roeck and Michelangelo Mangano CERN-Proceedings-2018-001, ISBN 978–92–9083–512–7 (print), ISBN 978–92–9083–513–4 (PDF)

CERN Proceedings, Vol 2 (2017): Proceedings of the Injector MD Days 2017

CERN Proceedings
Geneva, Switzerland, 23--24 March 2017 Edited by H. Bartosik and G. Rumolo CERN-Proceedings-2017-002, ISBN 978-92-9083-474-8 (print), ISBN 978-92-9083-475-5 (PDF)

CERN Proceedings, Vol 1 (2019): Proceedings of the 15th International Conference on Nuclear Reaction Mechanisms

CERN Proceedings
Varenna (Italy), Villa Monastero, June 11–15, 2018 Editors: F. Cerutti, A. Ferrari, T. Kawano, F. Salvat-Pujol, and P. Talou ISBN 978-92-9083-519-6 (paperback) ISBN 978-92-9083-520-2 (PDF)

Current Status of Luminosity Measurement with the CMD-3 Detector at the VEPP-2000 e + e − Collider

Artem Ryzhenenkov Et Al.
The CMD-3 detector has taken data at the electron-positron collider VEPP-2000 since december 2010. The collected data sample corresponds to an integrated luminosity of 60 pb-6 in the c.m. energy range from 0.32 up to 2 GeV. Preliminary results of the luminosity measurement are presented for various energy ranges and its accuracy is estimated to be 1%.

BATCH COMPRESSION TO 50 NS SPACING AT PS FLAT-TOP

Heiko Damerau
The bunch spacing in the injector chain has a direct impact on the total number of bunches in the LHC and hence on its integrated luminosity. The baseline scheme for lead ion beams within the LHC Injector Upgrade (LIU) project fore- sees the transfer of multiple batches of four bunches spaced by 100 ns from the PS to the SPS. The bunch spacing will then be reduced by momentum slip-stacking from 100 ns to 50...

Charged Particle Identification using the Liquid Xenon Calorimeter of the CMD-3 Detector

Vyacheslav Ivanov Et Al.
This paper describes a currently being developed procedure of the charged particle identification for CMD-3 detector, installed at the VEPP-2000 collider. The procedure is based on the application of the boosted decision trees classification method, and uses as input variables, among others, the specific energy losses of charged particle in the layers of the liquid Xenon calorimeter. The efficiency of the procedure is demonstrated by an example of the extraction of events of e+e- to...

MACHINE DEVELOPMENT STUDIES FOR PSB EXTRACTION AT 160 MEV AND PSB TO PS BEAM TRANSFER

V. Forte Et Al.
This paper collects the machine development (MD) activities for the beam transfer studies in 2016 concerning the PSB extraction and the PSB-to-PS transfer. Many topics are covered: from the 160 MeV extraction from the PSB, useful for the future commissioning activities after the connection with Linac4, to new methodologies for measuring the magnetic waveforms of kickers and dispersion reduction schemes at PS injection, which are of great interest for the LHC Injectors Upgrade (LIU) [1]...

Radiation Hardness Study of CsI(Tl) Crystals for Belle II Calorimeter

Dmitry Matvienko Et Al.
The Belle II calorimeter (at least, its barrel part) consists of CsI(Tl) scintillation crystals which have been used at the Belle experiment. We perform the radiation hardness study of some typical Belle crystals and conclude their light output reductions are acceptable for Belle II experiment where the absorption dose can reach 10 krad during the detector operation. CsI(Tl) crystals have high stablity and low maintenance cost and are considered as possible option for the calorimeter...

FIXED TARGET BEAMS

V. Kain Et Al.
The CERN SPS (Super Proton Synchrotron) serves as LHC injector and provides beam for the North Area fixed target experiments. At low energy, the vertical acceptance becomes critical with high intensity large emittance fixed target beams. Optimizing the vertical available aperture is a key ingredient to optimize transmission and reduce activation around the ring. During the 2016 run a tool was developed to provide an automated local aperture scan around the entire ring. The flux...

The VEPP-2000 Collider Control System: Operational Experience

Alexander Senchenko, Dmitry Berkaev, Alexander Lysenko, Yury Rogovsky & Petr Shatunov
The VEPP-2000 collider was commissioned and operated successfully in 2010-2013. During the operation the facility underwent continuous updates and experience in maintenance was acquired. Strong cooperation between the staff of the accelerator complex and the developers of the control system proved effective for implementing the necessary changes in a short time.

Calorimetry at the CMD-3 Detector

Georgiy Razuvaev Et Al.
The general purpose detector CMD-3 has been collecting data since 2010 in an energy range 0.32–2 GeV at the e+e- collider VEPP-2000 at the Budeker Institute of Nuclear Physics. The detector physics program includes the study of the e+e- annihilation into hadrons. To supply high registration efficiency for neutral particles the CMD-3 has an electromagnetic calorimeter consisted of three subsystems: BGO endcap calorimeter and barrel one with an inner part based on LXe and outer...

SPS BATCH SPACING OPTIMISATION

F. M. Velotti Et Al.
Until 2015, the LHC filling schemes used the batch spacing as specified in the LHC design report. The maximum number of bunches injectable in the LHC directly depends on the batch spacing at injection in the SPS and hence on the MKP rise time. As part of the LHC Injectors Upgrade project for LHC heavy ions, a reduction of the batch spacing is needed. In this direction, studies to approach the MKP design rise time...

The CMD-3 Data Acquisition System

Alexey Nickolaevich Kozyrev Et Al.
The specialized data acquisition system designed for CMD-3 detector which is installed at the electron-positron collider VEPP-2000 to the Budker Institute of Nuclear Physics, Novosibirsk, Russia. The structure of electronic hardware and firmware is described.

TRANSVERSE STUDIES WITH IONS AT SPS FLAT BOTTOM

F. Antoniou Et Al.
The LHC injectors upgrade project (LIU) aims at consolidating and upgrading the existing accelerator chain at CERN in view of the increased beam performance required for the High Luminosity LHC (HL-LHC) project. For the ion chain, the losses and emittance growth in the SPS impose presently the main performance limitation. The significant beam degradation encountered on the long injection plateau has been studied during the 2016 MD runs with Pb82+. In this report we present...

LEIR IMPEDANCE MODEL AND COHERENT BEAM INSTABILITY OBSERVATIONS

N. Biancacci Et Al.
The LEIR machine is the first synchrotron in the ion acceleration chain at CERN and it is responsible to deliver high intensity ion beams to the LHC. Following the recent progress in the understanding of the intensity limitations, detailed studies of the machine impedance started. In this work we describe the present LEIR impedance model, detailing the contribution to the total longitudinal and transverse impedance of several machine elements. We then compare the machine tune...

HOLLOW BUNCHES PRODUCTION

S. Hancock Et Al.
Hollow bunches address the issue of high-brightness beams suffering from transverse emittance growth in a strong space charge regime. During the Proton Synchrotron (PS) injection plateau, the negative space charge tune shift can push the beam onto the Qy = 6 integer resonance. Modifying the longitudinal bunch profile in order to reduce the peak line charge density alleviates the detrimental impact of space charge. To this end we first produce longitudinally hollow phase space distributions...

Realistic Approach for Beam Dynamics Simulation with Synchrotron Radiation in High Energy Circular Lepton Colliders

Sergey Glukhov Et Al.
In extremely high energy circular lepton colliders, correct consideration of synchrotron radiation is important for beam dynamics simulation. We developed a fast precise effective method to track particles in a realistic lattice when the radiation effects are distributed along the orbit. In the present paper we study an effect of decreasing dynamic aperture due to radiation from quadrupole lenses in the FCC-ee lepton collider.

X-ray Tomography using Thin Scintillator Films

Evgeny Kozyrev Et Al.
2-14 μm thin CsI:Tl scintillation screens with high spatial resolution were prepared by the thermal deposition method for low energy X-ray imaging applications. The spatial resolution was measured as a function of the film thickness. It was proposed that the spatial resolution of the prepared conversion screens can be significantly improved by an additional deposition of a carbon layer.

SOURCE AND LINAC3 STUDIES

G. Bellodi
In the framework of the LHC Ion Injector Upgrade programme (LIU), several activities have been carried out in 2016 to improve the ion source and Linac3 performance, with the goal to increase the beam current routinely delivered to LEIR. The extraction region of the GTS-LHC ion source was upgraded with enlarged vacuum chamber apertures and the addition of an einzel lens, yielding higher transmission through the rest of the machine. Also, a series of experiments...

Estimating gluon saturation in dijet photoproduction in UPC

Piotr Kotko
We study dijet production in the ultra-peripheral heavy ion collisions (UPC) at LHC within the saturation formalism. More precisely, we use an approach which is the large-$p_T$ approximation to the Color Glass Condensate on one hand, and the small-$x$ limit of the transverse momentum dependent (TMD) factorization on the other. The direct component of the dijet production in UPC at small $x$ probes the so-called Weizsacker-Williams (WW) TMD gluon distribution, which is not accessible in...

Anomalous gauge interactions in photon collisions at the LHC and the FCC

Sylvain Fichet & Cristian Baldenegro
The forward proton detectors recently installed and operating at the LHC open the possibility to observe photon collisions with high precision, providing a novel window on physics beyond the Standard Model. We review recent simulations and theoretical developments about the measurement of anomalous $\gamma\gamma\gamma\gamma$ and $Z\gamma\gamma\gamma$ interactions. The searches for these anomalous gauge interactions are expected to set bounds on a wide range of particles including generic electroweak particles, neutral particles with dimension-5 coupling to...

The photon PDF from high-mass Drell-Yan data at the LHC

Valerio Bertone
I present a determination of the photon PDF from a fit to the recent ATLAS measurements of high-mass Drell-Yan lepton-pair production at $\sqrt{s} = 8$ TeV. This analysis is based on the {\tt xFitter} framework interfaced to the {\tt APFEL} program, that accounts for NLO QED effects, and to the {\tt aMCfast} code to account for the photon-initiated contributions within {\tt MadGraph5\_aMC@NLO}. The result is compared with other recent determinations of the photon PDF finding...

Preface PHOTON'17 conference proceedings

David Enterria
The PHOTON 2017 conference (``International Conference on the Structure and the Interactions of the Photon'', including the 22th ``International Workshop on Photon-Photon Collisions, and the ``International Workshop on High Energy Photon Colliders'') was held at CERN (Geneva) from 22th to 26th May, 2017. The conference is part of a series that was initiated in 1973 in Paris as ``International Colloquium on Photon-Photon Collisions at Electron-Positron Storage Rings''. The latest Photon conferences took place in Novosibirsk...

Prospects for $\gamma\gamma\to$ Higgs observation in ultraperipheral ion collisions at the Future Circular Collider

David Enterria, Daniel E. Martins & Patricia Rebello Teles
We study the two-photon production of the Higgs boson, $\gamma\gamma\to H$, at the Future Circular Collider (FCC) in ultraperipheral PbPb and pPb collisions at $\sqrt{s_{NN}} = 39$ and 63 TeV. Signal and background events are generated with MadGraph-5, including $\gamma$ fluxes from the proton and lead ions in the equivalent photon approximation, yielding $\sigma(\gamma\gamma\to H)$ = 1.75 nb and 1.5 pb in PbPb and pPb collisions respectively. We analyse the H$\to b\bar{b}$ decay mode including...

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