BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Drift chamber with cluster counting techniques for CEPC DTSTART;VALUE=DATE-TIME:20230907T150000Z DTEND;VALUE=DATE-TIME:20230907T152000Z DTSTAMP;VALUE=DATE-TIME:20260516T043720Z UID:indico-contribution-534-3259@indico.tlabs.ac.za DESCRIPTION:Speakers: Guang Zhao ()\, Shuaiyi Liu (Institute of High Energ y Physics)\nThe Circular Electron Positron Collider (CEPC) is designed to operate at center-of-mass energies of 240 GeV as a Higgs factory\, as well as at the Z-pole and the WW production threshold for electroweak precisio n measurements and study of flavor physics. A good identification of charg ed kaons is essential for the flavor physics and benefits the determinatio n of jet flavor and jet charge. To achieve these physics goals\, a design of tracking system combining a silicon tracker and a drift chamber is prop osed. The silicon tracker provides excellent spatial resolution and granul arity to cope with track separation in dense jets. The drift chamber could provide excellent particle identification (PID) performance with cluster counting technique. The cluster counting\, which measures the number of pr imary ionizations (dN/dx) instead of the energy loss (dE/dx) along the par ticle trajectory in a gaseous detector\, represents the most promising bre akthrough in PID. The Poissonian nature of the dN/dx offers a more statist ically significant way of ionization measurement\, which makes the dN/dx p otentially has a resolution two times better than the dE/dx. \nIn this pre sentation\, detailed PID study of the CEPC drift chamber will be discussed . Simulations from the ideal model to a more realistic one have been carri ed out. The ideal model\, which only simulates the ionization process with out considering the detector response\, shows promising PID performance fo r dN/dx over dE/dx. The realistic model\, which includes the detector and electronics responses as well as the reconstruction algorithm\, is used to optimize the drift chamber design and to provide the PID performance. A p reliminary CEPC drift chamber design is proposed. The PID performance in t erms of the kaon and pion separation power with one meter track for 20 GeV /c momentum can reach 2σ level\, which satisfies the preliminary physics requirements of CEPC.\n\nhttps://indico.tlabs.ac.za/event/112/contribution s/3259/ LOCATION: Meeting Room 2.41 - 2.43 URL:https://indico.tlabs.ac.za/event/112/contributions/3259/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of highly granular hadronic calorimetry with glass sci ntillator tiles DTSTART;VALUE=DATE-TIME:20230907T160000Z DTEND;VALUE=DATE-TIME:20230907T162000Z DTSTAMP;VALUE=DATE-TIME:20260516T043720Z UID:indico-contribution-534-2969@indico.tlabs.ac.za DESCRIPTION:Speakers: Dejing Du (Institute of High Energy Physics\, Chines e Academy of Sciences)\nFuture electron-positron colliders (e.g. the Circu lar Electron Positron Colllider\, namely CEPC) impose stringent requiremen ts on the energy resolutions of hadron and jets for the precision physic p rograms of the Higgs\, Z\, W bosons and the top quark. To address the chal lenges\, one of the state-of-art calorimetry options is high-granularity c alorimetry based on the particle flow algorithms (PFA). The CEPC team has proposed a new detector concept named “the 4th detector concept”. A ma jor motivation is to significantly improve the Boson Mass Resolution (BMR) of better than 3% compared to 4%\, which corresponds to the performance o f the baseline detector proposed in the CEPC Conceptual Design Report (CEP C CDR).\nAs a key sub-detector in “the CEPC 4th detector concept”\, a new design of highly granular sampling hadronic calorimetry (HCAL) has bee n proposed\, which consists of sensitive layers with glass scintillator ti les and absorber plates. A major motivations is to significantly improve t he hadronic energy resolution with a higher energy sampling fraction and a significantly lower energy threshold\, which in turn requires the merits of high density and high light yield for the glass scintillator materials. A simulation model with Geant4 has been developed for the design optimiza tions of the glass scintillator HCAL and quantitative hadronic performance with single hadrons. Furthermore\, physics potentials of the PFA performa nce have also been evaluated in the CEPC full detector simulation. Highlig hts of the expected hadronic performance and hardware developments will be presented in this contribution. Future beamtest preparations of a few gla ss scintillator tiles are currently ongoing and preliminary results could be expected as well.\n\nhttps://indico.tlabs.ac.za/event/112/contributions /2969/ LOCATION: Meeting Room 2.41 - 2.43 URL:https://indico.tlabs.ac.za/event/112/contributions/2969/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of a novel high granularity crystal electromagnetic ca lorimeter DTSTART;VALUE=DATE-TIME:20230907T152000Z DTEND;VALUE=DATE-TIME:20230907T154000Z DTSTAMP;VALUE=DATE-TIME:20260516T043720Z UID:indico-contribution-534-2983@indico.tlabs.ac.za DESCRIPTION:Speakers: Baohua Qi (Institute of High Energy Physics\, Chines e Academy of Sciences)\nMotivated by the physics programs that aim at prec ision measurements of the Higgs\, W and Z bosons\, as well as the top quar k\, future lepton colliders (e.g. the Circular Electron Positron Collider\ , or CEPC) require an excellent calorimetry system to achieve the unpreced ented jet energy resolution. The CEPC team has proposed a new detector con cept named “the 4th detector concept”. A major motivation is to signif icantly improve the Boson Mass Resolution (BMR) of better than 3% compared to 4%\, which corresponds to the performance of the baseline detector pro posed in the CEPC Conceptual Design Report (CEPC CDR). As a key sub-detect or of “the CEPC 4th detector concept”\, the novel high granularity cry stal electromagnetic calorimeter (ECAL) is designed to achieve an excellen t jet reconstruction and an optimal EM energy resolution of $2-3~\\%/\\sqr t{E(GeV)}$ with the homogeneous structure and excellent three-dimensional spatial and temporal resolutions.\n\nExtensive R&D efforts have been carri ed out to assess the potential and requirements of the crystal ECAL with d edicated Geant4 full simulation\, ranging from the ECAL detector units to the full sub-detector system. Hardware activities\, which focus on charact erizing crystals and silicon photomultipliers (SiPMs)\, have been conducte d to provide solid inputs for simulation validation. The physics performan ce evaluation studies are ongoing with particle-flow algorithm “Arbor” \, which is being optimized for the crystal ECAL as well as the general “4th detector concept”. Meanwhile\, small-scale crystal modules are cu rrently under development for beam tests to evaluate the performance of el ectromagnetic showers and to address critical issues at the system-level.\ n\nThis contribution will introduce the crystal ECAL design and optimizati ons\, the latest progress on the performance evaluation\, crystal-SiPM mea surements and simulation validation. Preliminary beamtest results could al so be expected.\n\nhttps://indico.tlabs.ac.za/event/112/contributions/2983 / LOCATION: Meeting Room 2.41 - 2.43 URL:https://indico.tlabs.ac.za/event/112/contributions/2983/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of CMOS Pixel Sensor prototypes for the CEPC vertex de tector DTSTART;VALUE=DATE-TIME:20230907T140000Z DTEND;VALUE=DATE-TIME:20230907T142000Z DTSTAMP;VALUE=DATE-TIME:20260516T043720Z UID:indico-contribution-534-3231@indico.tlabs.ac.za DESCRIPTION:Speakers: Ying Zhang ()\nThe proposed Circular Electron Positr on Collider (CEPC) imposes new challenges for the vertex detector in terms of material budget\, spatial resolution\, readout speed\, and power consu mption. The TaichuPix chip is a dedicated CMOS Pixel Sensor that is being developed for the first 6-layer silicon vertex detector prototype of the C EPC vertex detector R&D. The TaichuPix chip need to provide a spatial reso lution better than 5 μm\, and a radiation tolerance higher than 1 MRad. T he TaichuPix development is based on a fast in-pixel readout combined with a hit-driven architecture\, which would be beneficial for the high hit ra te. Over the last years of R&D\, several prototypes have been designed to optimize in-pixel circuit and readout architecture\, and to verify radiati on hardness. Two small-scale demonstrator chips (25 $mm^2$) capable of ach ieving a hit rate up to 36 MHz/$cm^2$\, were developed in a 180 nm CMOS pr ocess. Two different in-pixel digital readout designs\, benefiting from th e FE-I3 and ALPIDE approaches\, have been implemented to achieve a fast re adout. The readout of the pixel array is based on a proposed “column-dra in” architecture. The positive results of the small-scale prototypes led to a submission of the first full-scale (2.6 cm × 1.6 cm) TaichuPix prot otype in 2022. These prototypes were firstly characterized with electrical and radioactive sources in laboratory. The full-scale sensor chip was fur ther characterized at the DESY test beam facility. The design details of T aichuPix prototypes and a summary of the results obtained are given.\n\nht tps://indico.tlabs.ac.za/event/112/contributions/3231/ LOCATION: Meeting Room 2.41 - 2.43 URL:https://indico.tlabs.ac.za/event/112/contributions/3231/ END:VEVENT BEGIN:VEVENT SUMMARY:Glass Scintillator HCAL at future e+e− Higgs factory DTSTART;VALUE=DATE-TIME:20230907T154000Z DTEND;VALUE=DATE-TIME:20230907T160000Z DTSTAMP;VALUE=DATE-TIME:20260516T043720Z UID:indico-contribution-534-2768@indico.tlabs.ac.za DESCRIPTION:Speakers: sen Qian (IHEP\,CAS)\nThe future e+e− Higgs factor y\, whose main goal is to achieve a precise measurement of mass and proper ties of the Higgs boson\, is the main development trend of the next-genera tion large collider. A big challenge for this goal is to fulfill an unprec edented jet energy resolution\, and the scheme selection of hadronic calor imeter (HCAL) is one of the most important factors. Scintillation material s can convert high-energy rays into visible light. Generally\, solid scint illator can be divided into crystal scintillator\, plastic scintillator\, glass scintillator and ceramic scintillator. Compared with crystal scintil lator\, the glass scintillator has many advantages\, such as a simple prep aration process\, low cost and continuously adjustable components. Therefo re\, glass scintillator has long been conceived for application in the nuc lear detection such as hadronic calorimeter. Given the deficiency of the c rystal and the plastic scintillator\, a new concept\, Glass Scintillator H adronic Calorimeter for CEPC (GS-HCAL)\, was proposed. In 2021\, the resea rchers in the Institute of High Energy Physics (IHEP) have set up the Larg e Area Glass Scintillator Collaboration (GS group) to study the new glass scintillator with high density and high light yield. Currently\, a series of high density and high light yield scintillation glasses have been succe ssfully developed. The GSHCAL conceptual design with preliminary detector optimization by simulation has been done. The physics potential and the R& D of the GSHCAL will be presented in this paper.\n\nhttps://indico.tlabs.a c.za/event/112/contributions/2768/ LOCATION: Meeting Room 2.41 - 2.43 URL:https://indico.tlabs.ac.za/event/112/contributions/2768/ END:VEVENT BEGIN:VEVENT SUMMARY:High spatial resolution of Time Projection Chamber R&D at high lum inosity Tera-Z on CEPC DTSTART;VALUE=DATE-TIME:20230907T144000Z DTEND;VALUE=DATE-TIME:20230907T150000Z DTSTAMP;VALUE=DATE-TIME:20260516T043720Z UID:indico-contribution-534-2797@indico.tlabs.ac.za DESCRIPTION:Speakers: Huirong Qi (Institute of High Energy Physics\, CAS)\ nThe Circular Electron Positron Collider (CEPC) was been proposed as a Hig gs and high luminosity Z factory in last few years. The detector conceptua l design of a updated detector consists of a tracking system\, which is a high precision (about 100μm) spatial resolution Time Projection Chamber ( TPC) detector as the main track device in very large 3D volume. The tracki ng system required the high precision performance requirements\, but witho ut power-pulsing not likely as the International Linear Collider (ILC)\, w hich leads to additional constraints on detector specifications\, especial ly for the case of the machine operating at the high luminosity Z pole (Te ra Z). TPC detection technology requires longitudinal time resolution of a bout 100ns and the physics goals require Particle Identification Detection (PID) resolution of very good separation power with cluster counting to b e considered. A number of critical issues are still remaining regarding th e TPC research. The simulation and PID resolution show TPC technology pote ntial to extend Tera Z at the future e+e- collider.\nIn this talk\, I will present the feasibility and status of high precision TPC as the main trac k detector for e+e collider. The traditional pad readout is designed about 1mm x 6mm and the pixelated readout is designed about 55μm x 5μm or big ger size. Compared with the pad readout\, the pixelated readout option wil l obtain the better spatial resolution of single electrons\, the very high detection efficiency in excellent tracking and good dE/dx performance. A smaller prototype TPC has been developed with a drift length of 500 mm\, g aseous chamber\, 20000V field-cage\, the low power consumption FEE electro nics and DAQ have been commissioned and some studies have been finished. S ome updated experimental results including the spatial resolution\, the ga s gain\, the laser track reconstruction and dE/dx will be reported. The tr ack performance results and summarize the next steps of the pad/pixelated TPC technology for e+e- collider will presented in this talk.\n\nhttps://i ndico.tlabs.ac.za/event/112/contributions/2797/ LOCATION: Meeting Room 2.41 - 2.43 URL:https://indico.tlabs.ac.za/event/112/contributions/2797/ END:VEVENT BEGIN:VEVENT SUMMARY:R&D status for an innovative crystal calorimeter for the future Mu on Collider DTSTART;VALUE=DATE-TIME:20230907T142000Z DTEND;VALUE=DATE-TIME:20230907T144000Z DTSTAMP;VALUE=DATE-TIME:20260516T043720Z UID:indico-contribution-534-2769@indico.tlabs.ac.za DESCRIPTION:Speakers: Ivano Sarra (Istituto Nazionale di Fisica Nucleare - LNF)\nThe Crilin calorimeter is a semi-homogeneous calorimeter based on L ead Fluoride (PbF2) Crystals readout by surface-mount UV-extended Silicon Photomultipliers (SiPMs). It is a proposed solution for the electromagneti c calorimeter of the future Muon Collider. A high granularity is required in order to distinguish signal particles from the background and to solve the substructures necessary for jet identification. Time of arrival measur ements in the calorimeter could play an important role\, since very large occupancy due to beam-induced backgrounds is expected\, and the timing cou ld be used to identify energy depositions compatible with the expected muo n-muon interaction time. The calorimeter energy resolution is also fundame ntal to measure the kinematic properties of jets. Moreover\, the calorimet er should also operate in a very harsh radiation environment: 1 Mrad/year total ionizing dose (TID) and a 10^14 neutron 1MeV/cm^2/year equivalent ne utrons fluence. Our radiation hardness studies on crystals and SiPMs\, hav e demonstrated we can work in this environment both for dose and neutron f luences.\nA dedicated test beam\, on single cell prototype (Proto-0)\, has been performed at CERN H2 in August 2022 with an electron energy of 120 G eV: a timing resolution better than 50 ps has been achieved for energy dep osits greater than 1 GeV. \nIn order to validate the design choices\, the proposal is to build a larger prototype\, called Proto-1. The design has b een optimized with the simulation studies starting from dimensions of 0.7 R𝑀 and 8.5 X0 (∼ 0.3𝜆). This size comes from a compromise of an ac ceptable containment of 100 GeV electrons and cost constraints. Results wi ll be extrapolated to the optimum length of the Muon Collider calorimeter of the order of 20 X0.\nThe proposal is to build Proto-1 with two layers o f 3 × 3 PbF2 crystals\, each read out with UV-extended SiPMs (Hamamatsu S 14160-3010 PS SMD sensors) as already done in Proto-0. These new SiPMs wer e already tested with an ultra-fast blue laser (400 nm\, 100 ps) and the n ew electronics front-end (FEE) that showed a dynamic range from 0 to 2 V\, a rise time of ∼ 2 ns with full signal in ~ 70 ns and a time resolution less than 50 ps even at a charge as low as 100 pC (∼ 250 Np.e.). The pr oto-1 operational temperature will be 0/−10◦C and the performance will be validated in a dedicated test beam. Specifically\, our goals are: 1) p erform a complete operational test of the prototype\, including operation with cooling\; 2) obtain data for a complete analysis of digitized signals from the detector for electrons and minimum-ionizing particles\; 3) test the cluster reconstruction capability and measure the time resolution\; 4) measure longitudinal and transverse shower profile and compare with resul ts obtained in simulation. \nDetails about the prototype mechanics and ele ctronics will be shown\; Proto-1 will be tested in a dedicated test beam a t Cern before the end of 2023.\n\nhttps://indico.tlabs.ac.za/event/112/con tributions/2769/ LOCATION: Meeting Room 2.41 - 2.43 URL:https://indico.tlabs.ac.za/event/112/contributions/2769/ END:VEVENT END:VCALENDAR