BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:First years of running for the LHCb calorimeter system DTSTART;VALUE=DATE-TIME:20140227T082000Z DTEND;VALUE=DATE-TIME:20140227T084500Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-3@indico.inp.nsk.su DESCRIPTION:Speakers: Sergey Filippov (Institute for Nuclear Research)\nTh e LHCb experiment is dedicated to precision measurements of CP violation a nd rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Ge neva) [1\, 2]. LHCb is a single-arm spectrometer with a forward angular co verage from approximately 10 mrad to 300 mrad. It comprises a calorimeter system composed of four subdetectors [3]\, selecting transverse energy had ron\, electron and photon candidates for the first trigger level (L0)\, wh ich makes a decision 4 μs after the interaction. It provides the identifi cation of electrons\, photons and hadrons as well as the measurement of th eir energies and positions. The set of constraints resulting from these fu nctionalities defines the general structure and the main characteristics o f the calorimeter system and its associated electronics. A classical struc ture of an electromagnetic calorimeter (ECAL) followed by a hadron calorim eter (HCAL) has been adopted. In addition the system includes in front of them the Scintillating Pad Detector (SPD) and Pre-Shower (PS)\, which are two planes of scintillating pads separated by a 2.5 radiation length lead sheet\, aimed at tagging the electric charge and the electromagnetic natur e of the calorimeter clusters for the first level of trigger. ECAL\, PS an d SPD account for about 6000 channels each with three degrees of granulari ty\, concentric around the beam pipe\, namely\, the inner\, the middle and the outer parts. HCAL is made of about 1500 channels and is divided into two parts only. All four detectors are arranged in pseudo-projective geome try and follow the general principle of reading the light from scintillato r tiles with wave-length shifting fibers\, and transporting the light towa rds photomultipliers\, all following the 25 ns readout.\nThe calorimeter h as been pre-calibrated before its installation in the pit\, and the calibr ation techniques have been tested with the data taken in 2010. During oper ation\, hadronic\, leptonic and photon triggers of particular interest for hadronic B decays and radiative decays were provided by the calorimeter s ystem.\nThe design and construction characteristics of the LHCb calorimete r will be recalled. Strategies for monitoring and calibration during data taking will be detailed in all aspects. Scintillating fibres\, plastics an d photomultipliers suffer from ageing due to radiation damage or high curr ents. Different methods which are used to calibrate the detectors and to r ecover the initial performances will be presented. The performances achiev ed will be illustrated in selected channels of interest for B physics.\nRe ferences: \n[1] LHCb Collaboration\, The LHCb Detector at the LHC\, JINST 3 S08005 (2008)\, and references therein.\n[2] LHCb collaboration\, A larg e Hadron Collider Beauty experiment\, Technical Proposal\, CERN/LHCC 1998- 004.\n[3] LHCb Collaboration\, LHCb calorimeters Technical Design Report\, Technical Design Report\, CERN/LHCC 2000-036.\n\nhttps://indico.inp.nsk.s u/event/0/contributions/3/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Particle flow calorimetry for Linear Collider DTSTART;VALUE=DATE-TIME:20140227T073000Z DTEND;VALUE=DATE-TIME:20140227T075500Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-29@indico.inp.nsk.su DESCRIPTION:Speakers: Felix Sefkow (Deutsches Elektronen Synchrotron)\nThe development and optimisation of calorimeters for particle methods at futu re colliders will be discussed. The talk will present the status of experi mental validation with emphasis on recent results from test beam data anal ysis. Examples from current studies on scalable engineering solutions and system integration are shown.\n\nhttps://indico.inp.nsk.su/event/0/contrib utions/29/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/29/ END:VEVENT BEGIN:VEVENT SUMMARY:Performance of the ATLAS Tile Hadronic Calorimeter at LHC in Run 1 and planned upgrades DTSTART;VALUE=DATE-TIME:20140227T094000Z DTEND;VALUE=DATE-TIME:20140227T101000Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-47@indico.inp.nsk.su DESCRIPTION:Speakers: Oleg Solovyanov (Institute for High Energy Physics)\ nThe Tile Calorimeter (TileCal) is the central section of the ATLAS hadron ic calorimeter at the Large Hadron Collider\, a key detector for the measu rements of hadrons\, jets tau leptons and missing transverse energy. Scint illation light produced in the tiles is transmitted by wavelength shifting fibers to photomultiplier tubes (PMTs).\nThe resulting electronic signals from approximately 10000 PMTs are measured and digitized before being tra nsferred to off-detector data-acquisition systems.\nAfter an initial setti ng of the absolute energy scale in test beams with particles of well-defin ed momentum\, the calibrated scale was transferred to the rest of the dete ctor via the response to radioactive sources. The calibrated scale was val idated in situ with muons and single hadrons and the timing performance wi th muons and jets as detailed in this contribution.\nThe data quality proc edures used during the LHC data-taking and the evolution of the detector s tatus are exposed. The energy and the time reconstruction performance of t he digitized signals is presented and the noise behavior and its improveme nt with the detector consolidation in maintenance periods are shown.\nA se t of calibration systems allow the monitoring and the equalization of the calorimeter channels response via signal sources that act at every stage o f the signal path\, from scintillation light to digitized signal.\nThese p artially overlapping systems are described in detail\, their individual pe rformance is exposed as well as comparative results on the response evolut ion of the calorimeter with time during the full LHC data-taking period. T he procedure of setting the absolute energy scale for channels/cells is de scribed and the challenge of preserving it at the % level during 3 years o f LHC collision data is described.\nIts main upgrade will occur for the Hi gh Luminosity LHC phase (phase 2) where the peak luminosity will increase 5-fold compared to the design luminosity (10³⁴ cm⁻²s⁻¹) but with maintained energy (i.e. 7+7 TeV). An additional increase of the average lu minosity with a factor of 2 can be achieved by luminosity leveling. This u pgrade will probably happen around 2022.\nThe TileCal upgrade aims at repl acing the majority of the on- and off-detector electronics so that all cal orimeter signals are directly digitized and sent to the off-detector elect ronics in the counting room. To achieve the required reliability\, redunda ncy has been introduced at different levels. Three different options are p resently being investigated for the front-end electronic upgrade. Which on e to use will be decided after extensive test beam studies. 10 Gbps optica l links are used to read out all digitized data to the counting room while 5 Gbps down-links are used for synchronization\, configuration and detect or control. For the off-detector electronics a pre-processor (ROD) is bein g developed\, which takes care of the initial trigger processing while tem porarily storing the main data flow in pipeline and de-randomizer memories .\n\nhttps://indico.inp.nsk.su/event/0/contributions/47/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/47/ END:VEVENT BEGIN:VEVENT SUMMARY:Large area avalanche photodiodes with high quantum efficiency and extended UV response DTSTART;VALUE=DATE-TIME:20140228T040500Z DTEND;VALUE=DATE-TIME:20140228T043000Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-66@indico.inp.nsk.su DESCRIPTION:Speakers: David Hitlin (California Institute of Technology)\nS cintillators with fast decay time\, such as the barium fluoride fast compo nent (220 nm) or liquid xenon (165 nm) pose a difficult problem for photod etectors. This motivates the development by a Caltech/JPL/RMD collaboratio n of large area (~10×10 mm) avalanche photodiodes using superlattice dopi ng. These devices have high quantum efficiency and extended UV response an d excellent timing properties. They also incorporate an interference filte r to discriminate against the slow decay time component of barium fluoride .\n\nhttps://indico.inp.nsk.su/event/0/contributions/66/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/66/ END:VEVENT BEGIN:VEVENT SUMMARY:Space-charge effects in liquid argon ionization chambers DTSTART;VALUE=DATE-TIME:20140227T101000Z DTEND;VALUE=DATE-TIME:20140227T103500Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-83@indico.inp.nsk.su DESCRIPTION:Speakers: John Rutherfoord (University of Arizona)\nWe have un iformly irradiated liquid argon ionization chambers with betas from high-a ctivity Strontium-90 sources.\nThe radiation environment is similar to tha t in the liquid argon calorimeters which are part of the ATLAS detector in stalled at CERN's Large Hadron Collider (LHC). We measured the resulting i onization current over a wide range of applied potential for two different source activities and for three different chamber gaps. These studies pro vide operating experience at exceptionally high ionization rates.\nIn part icular they indicate a stability at the 0.1% level for these calorimeters over years of operation at the full LHC luminosity when operated in the no rmal mode at an electric field of 1.0 kV/mm. We can operate these chambers in the normal mode or in the space-charge limited regime and thereby dete rmine the transition point between the two. This transition point is param eterized by a positive argon ion mobility of μ₊ = 0.08 ± 0.02 mm²/Vs at 88.0 ± 0.5 K and 1.02 ± 0.02 bar. In the space-charge limited regime the ionization currents are severely degraded and show signs of instabilit y.\nAt the highest electric fields in our study the ionization current is still slowly rising with increasing electric field\, that is\, the current s don't appear to be approaching an asymptotic value.\n\nhttps://indico.in p.nsk.su/event/0/contributions/83/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/83/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of the polystyrene scintillator technology and particl e detectors on their basis DTSTART;VALUE=DATE-TIME:20140228T031000Z DTEND;VALUE=DATE-TIME:20140228T033500Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-84@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Rykalin (Institutef for high Energy Physics (Protvino))\nThe new designed at IHEP technologies of polystyrene scintil lators manufacturing - molding of polystyrene granules under pressure\, me lting of granules in forms with mirrors walls\, production of scintillatin g granules and detectors on their basis are considered.\n\nhttps://indico. inp.nsk.su/event/0/contributions/84/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/84/ END:VEVENT BEGIN:VEVENT SUMMARY:Upgrade of the Belle II Electromagnetic Calorimeter DTSTART;VALUE=DATE-TIME:20140228T043000Z DTEND;VALUE=DATE-TIME:20140228T045500Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-85@indico.inp.nsk.su DESCRIPTION:Speakers: Kenkichi Miyabayashi (Nara Women University)\nThe co nstruction of the SuperKEKB electron-positron collider and upgrade of the Belle II spectrometer are going on at KEK aiming at high precision measure ments in bottom\, charm and tau flavor sectors. We describe a replacement of the electronics for the CsI(Tl) crystal calorimeter with PIN-PD readout to match the luminosity increase up to 800/(nb·sec) at maximum. A plan t o replace CsI(Tl) crystals with pure CsI in the endcaps is also mentioned. \n\nhttps://indico.inp.nsk.su/event/0/contributions/85/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/85/ END:VEVENT BEGIN:VEVENT SUMMARY:The LXe calorimeter and the pixelated timing counter in the MEG II experiment DTSTART;VALUE=DATE-TIME:20140228T020000Z DTEND;VALUE=DATE-TIME:20140228T022500Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-86@indico.inp.nsk.su DESCRIPTION:Speakers: Toshiyuki Iwamoto (The University of Tokyo)\nThe pur pose of the MEG experiment is to look for a lepton flavor violating μ→e γ decay with an unprecedented sensitivity\, and we set an upper limit of the branching ratio for this decay\, 5.7×10⁻¹³ at 90% C.L. in 2013 wh ich is twenty times more stringent limit than the previous experiment\, ME GA. Since the sensitivity improvement of the MEG experiment was limited by the accidental background\, we have considered the major detector upgrade . A proposal was submitted to PSI committee\, and was approved by PSI in 2 013\, which aims for a sensitivity enhancement of one order of magnitude c ompared to the final MEG result.\nHere I will mainly introduce you two com ponents of the MEG detector\, a gamma-ray calorimeter with 900 l liquid xe non (LXe)\, and a pixelated timing counter. The LXe detector will be impro ved by increasing the granularity at the incident face\, by replacing the current PMTs with a larger number of smaller photosensors (MPPC) and optim izing the photosensor layout also on the lateral faces. A new highly segme nted\, fast timing counter array will replace the old system to allow impr oved timing resolution capabilities.\n\nhttps://indico.inp.nsk.su/event/0/ contributions/86/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/86/ END:VEVENT BEGIN:VEVENT SUMMARY:Performance of the BGO endcap calorimeter of the CMD-3 detector DTSTART;VALUE=DATE-TIME:20140228T025000Z DTEND;VALUE=DATE-TIME:20140228T031000Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-95@indico.inp.nsk.su DESCRIPTION:Speakers: Ravel Akhmetshin (Budker Institute of Nuclear Physic s)\nThe BGO endcap calorimeter was successfully operated in the CMD-2 dete ctor at the VEPP-2M collider. It consists of 680 BGO crystals each with a size of 25×25×150 mm³\, arranged in two identical endcaps\, with a tota l crystal weight of 450 kg. The light readout used vacuum phototriodes. Th e endcap calorimeter has now been upgraded to work in the CMD-3 detector a t new collider VEPP-2000. The major part of the endcap calorimeter\, the B GO crystals\, remains the same. The main upgrade is the use of silicon PIN photodiodes and new electronics. Main reason to change photosensitive dev ice is the strong non-uniform magnetic field in the endcap calorimeter vol ume and redused available space. The Hamamatsu PIN photodiode S3590-08 was chosen as the optimal solution\, as they are insensitive to magnetic fiel ds and are both compact and stable. An order of magnitude larger capacitan ce of silicon photodiodes requires design and produce new custom electroni cs. The upgrade is expected to bring an overall improvement of parameters. The endcap calorimeter has been installed in the detector and participate s in data taking which started at 2010. The preliminary energy resolution is measured in the energy range 160-1000 MeV. It is better compare to the CMD-2 detector.\n\nhttps://indico.inp.nsk.su/event/0/contributions/95/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/95/ END:VEVENT BEGIN:VEVENT SUMMARY:CMS ECAL performance and upgrade DTSTART;VALUE=DATE-TIME:20140227T084500Z DTEND;VALUE=DATE-TIME:20140227T091000Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-104@indico.inp.nsk.su DESCRIPTION:Speakers: Anton Karneyeu (Institute for Nuclear Research of th e Russian Academy of Sciences)\nThe CMS ECAL is a hermetic\, fine grained and homogeneous calorimeter containing 75848 lead-tungstate (PbWO₄) crys tals\, located inside the CMS superconducting solenoidal magnet. The scint illation light is detected by avalanche photodiodes (APDs) in the barrel s ection and by vacuum phototriodes (VPTs) in the two endcap sections. A sil icon/lead pre-shower detector is installed in front of the endcaps.\nPrese nted is ECAL performance and upgrade plans.\n\nhttps://indico.inp.nsk.su/e vent/0/contributions/104/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/104/ END:VEVENT BEGIN:VEVENT SUMMARY:Performance of the Atlas Liquid Argon Calorimeter after three year s of LHC operation and plans for a future upgrade DTSTART;VALUE=DATE-TIME:20140227T075500Z DTEND;VALUE=DATE-TIME:20140227T082000Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-109@indico.inp.nsk.su DESCRIPTION:Speakers: Pavol Strizenec (Institute of Experimental Physics S AS)\nThe ATLAS experiment is designed to study the protonproton collisions produced at the Large Hadron Collider (LHC) at CERN. Liquid argon samplin g calorimeters are used for all electromagnetic calorimetry covering the p seudorapidity region up to 3.2\, as well as for hadronic calorimetry in th e range 1.4-4.9. The electromagnetic calorimeters use lead as passive mate rial and are characterized by an accordion geometry that allows a fast and uniform azimuthal response. Copper and tungsten were chosen as passive ma terial for the hadronic calorimetry\; whereas a parallel plate geometry wa s adopted at large polar angles\, an innovative one based on cylindrical e lectrodes with thin argon gaps was designed for the coverage at low angles \, where the particles flow is higher. All detectors are housed in three c ryostats kept at 88.5 K. After installation in 2004-2006\, the calorimeter s were extensively commissioned over the three years period prior to first collisions in 2009\, using cosmic rays and single LHC beams. Since then\, around 27 fb⁻¹ of data have been collected at a unprecedented center o f mass energies between 7 TeV and 8 TeV. During all these stages\, the cal orimeter and its electronics have been operating with performances very cl ose to the specification ones.\nAfter 2019\, the instantaneous luminosity will reach 2-3×10³⁴ cm⁻²s⁻¹\, well above the luminosity for whic h the calorimeter was designed. In order to preserve its triggering capabi lities\, the detector will be upgraded with a new fully digital trigger sy stem with a refined granularity.\nIn 2023\, the instantaneous luminosity w ill ultimately reach 5-7×10³⁴ cm⁻²s⁻¹\, requiring a complete rep lacement of the readout electronics. Moreover\, with an increased particle flux\, several phenomena (liquid argon boiling\, space charge effects...) will affect the performance of the forward calorimeter (FCal). A replacem ent with a new FCal with smaller LAr gaps or a new calorimeter module are considered. The performance of these new calorimeters is being studied in highest intensity particle beams.\nThe talk will cover all aspects of the first three years of operation. The excellent performance achieved will be especially detailed in the context of the discovery of the Higgs boson an nounced in July 2012. The future plans to preserve this performance until the end of the LHC program will be also presented.\n\nhttps://indico.inp.n sk.su/event/0/contributions/109/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/109/ END:VEVENT BEGIN:VEVENT SUMMARY:Developing of Scintillation crystals for Calorimetry and Astropart icle Physics DTSTART;VALUE=DATE-TIME:20140228T045500Z DTEND;VALUE=DATE-TIME:20140228T051500Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-112@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Shlegel (Nikolaev Institute of Inorganic Ch emistry)\nDevelopment of detector materials takes place both due to the se arch of new scintillation crystal\, and by improvement of growing technolo gy for already known crystals.\nBasically scintillation crystals are grown by traditional techniques under high temperature gradient conditions. In most cases\, the temperature gradients nearly growth interface are in the range 40-200 K/cm. In such conditions thermoelastic stress and melt superh eating are inevitable. In some cases\, especially when it is necessary to grow large size crystals or crystals with strong anisotropy of the thermal properties and low mechanical strength\, high thermal gradients lead to t he destruction of crystals and that is a major obstacle to growth of high quality crystals. The melt superheating leads to volatility of charge comp onents\, disruption of stoichiometry and inhomogeneity functional properti es of crystal.\nIn the report the results of growth of top quality scintil lation crystals at low temperature gradient (LTG) conditions is presented. In LTG CZ technique temperature gradients are reduced by two orders of ma gnitude in comparison with the conventional crystal growth techniques.\nTh e results of growing BGO crystals large size (up to 60 kg) with high radia tion hardness are presented.\nThe advantages of use LTG CZ technique for g rowth of isotopically enriched crystals used for rare events searches are most essential. The crystal growth for these applications generally is ass ociated the use of very expensive raw materials (high radio purity\, isoto pically- enriched composition\,etc.) which is available in a very limited quantity. In addition for these projects requirements to crystal quality a re very high. Another essential requirement is a need to obtain the maximu m possible weight of a crystal from initial charge. The ossibility of the LTG technique are demonstrated on example of successful growth of isotopic ally enriched crystals 106CdWO₄ and 116CdWO₄ with duty factor about 85 % are presented.\nGrowth of large sized ZnMoO₄ crystals including develo pment of precursor's synthesis starting from Mo metal and recycling of res iduals for producing isotopically enriched Zn100MoO₄ crystals for LUMINE U project are also reported.\n\nhttps://indico.inp.nsk.su/event/0/contribu tions/112/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/112/ END:VEVENT BEGIN:VEVENT SUMMARY:The combined liquid xenon - crystal CsI calorimeter of CMD-3 detec tor DTSTART;VALUE=DATE-TIME:20140228T022500Z DTEND;VALUE=DATE-TIME:20140228T025000Z DTSTAMP;VALUE=DATE-TIME:20260419T140847Z UID:indico-contribution-5-115@indico.inp.nsk.su DESCRIPTION:Speakers: Vasiliy Shebalin (Budker Institute of Nuclear Physic s)\nSince 2010 the CMD-3 detector has been collecting data at the e⁺e⁻ collider VEPP-2000 in the Budker Institute of Nuclear Physics. CMD-3 is a general purpose detector designed to study e⁺e⁻ annihilation into had rons in the wide energy range\, E(c.m.s) = 0.3÷2 GeV. During 3 years of o peration detector collected integral luminosity of about 60 nb⁻¹.\nThe barrel electromagnetic calorimeter of the detector consists of two subsyst ems: closest to the beam pipe is the Liquid Xenon calorimeter (LXe) and th e outer one is based on CsI scintillation crystals (CsI). LXe calorimeter contains 400 liters of LXe\, covers a solid angle 0.8×4π and has a thick ness equals to 5.4 X₀. Finely segmented strip structure of the calorimet er electrodes provides the possibility to analyze energy deposition profil e through the shower direction\, reconstruct tracks of charged particles a nd measure total energy deposition.\nThe CsI calorimeter consists of 8 oct ants\, located around the LXe calorimeter\, and contains 1152 counters. Ea ch counter is based on CsI(Tl) or CsI(Na) crystal of 6×6×15 cm³ size th at corresponds to 8.1 X₀ in the direction transverse to the beam.\nThe t otal thickness of the barrel calorimeter is equal to 13.5 X₀.\nThe main advantage of the combined barrel calorimeter is that the LXe calorimeter a llows to measure the coordinates of gamma conversion point with spatial re solution of about 1.5 mm\, and additional 8 X₀ of crystal CsI provides t he total energy resolution of combined calorimeter of about 4.5% /1GeV.\nT he design of the calorimeter and its current performance are presented.\nT he energy calibration procedures using cosmic rays for LXe and CsI and usi ng elastic e⁺e⁻ scattering process for the LXe calorimeter are present ed in this work. The accuracy of calibration constants for LXe and CsI cal orimeters are about 2% and 3% correspondingly. Also the gamma energy recon struction is described in the work and the results of π⁰ reconstruction giving the π⁰ width of about 8% are presented.\n\nhttps://indico.inp.n sk.su/event/0/contributions/115/ LOCATION: URL:https://indico.inp.nsk.su/event/0/contributions/115/ END:VEVENT END:VCALENDAR