- sPHENIX QM 2019 contributions
- Proposed talks
- Possible presenter: John Lajoie
- Abstract:
- The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will enable a spectrum of new or improved cold QCD measurements, enhancing our understanding of the initial state for nuclear collisions. sPHENIX measurements in proton-proton and proton-nucleus collisions will reveal more about how partons behave in a nuclear environment, inform our understanding of the initial state in heavy-ion collisions, and provide comparative data to investigate modification of fragmentation functions. Measurements will also take advantage of RHIC's unique capability to collide polarized protons on nuclei, which provides novel opportunities to study nuclear effects with spin observables. A potential upgrade to sPHENIX with forward instrumentation could significantly enhance these physics capabilities. The cold QCD nuclear physics program for the proposed sPHENIX midrapidity detector as well as the enhanced program enabled with forward upgrades will be presented.
- [accepted]Title: Heavy flavor physics with the sPHENIX MAPS vertex tracker upgrade [submitted]
- Abstract:
- The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will measure a suite of unique jet and Upsilon observables with unprecedented statistics and kinematic reach at RHIC energies. A MAPS-based vertex detector upgrade to sPHENIX, the MVTX, will provide a precise determination of the impact parameter of tracks relative to the primary vertex in high multiplicity heavy ion collisions. The MVTX utilizes the latest generation of MAPS technology to provide precision tracking with high tracking efficiency over a broad momentum range in the high luminosity RHIC environment. These new capabilities will enable precision measurements of open heavy flavor observables, covering an unexplored kinematic regime at RHIC. The physics program, its potential impact, and recent detector development of the MVTX will be discussed in this talk.
- Possible presenter: Jet structure topical group
- Abstract:
- The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) benefits from the extensive detector advances driven by LHC and Electron-Ion Collider (EIC) detector R&D. The combination of electromagnetic calorimetry, hadronic calorimetry, precision tracking, and the ability to record data at a very high rates enables measurements of jets, jet substructure, and jet
- correlations at RHIC with a kinematic reach that will overlap with similar measurements at the LHC. Jet observables are a particularly useful probe of the Quark Gluon Plasma (QGP) formed in heavy-ion collisions since the hard scatted partons that fragment into final state jets are strongly “quenched”, losing energy to the medium as they traverse it. To answer fundamental questions about the physics of this process, we need to characterize the medium induced modification of the jet fragmentation pattern and the correlation of the lost energy with the jet axis. The measurements require removal of the soft, underlying event (UE), and we will show the performance of different UE subtraction techniques for calorimetric jets in sPHENIX. The performance of the detector for photon-jet and jet fragmentation observables will also be shown.
- Proposed posters
- Title: Performance studies of scintillator tiles for the sPHENIX hadronic calorimeter [submitted]
- Possible Presenter:
- Abstract: The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will begin taking data in 2023, providing detailed measurements of jets and Upsilons in 200 GeV Au+Au collisions. To make precision jet energy measurements, sPHENIX will be equipped with a Hadronic Calorimeter (HCal) located outside a 1.4T superconducting solenoidal magnet. The HCal is composed of 7,680 plastic scintillating tiles sandwiched between layers of steel absorber plates. Light produced by particles striking the tile is captured by a wavelength shifting fiber that routes the light to Silicon Photomultipliers (SiPM) at one end of the tile. The geometry of the mid-rapidity calorimeter is novel, tilted in azimuth such that particles coming from the interaction region traverse a number of scintillating tiles. The scintillator tiles come in different shapes based on their location in pseudorapidity. Tiles of the same shape are grouped together azimuthally in sets of five forming a “tower,” and the readout from a tower is the aggregate of the signals of each tile within a tower. Results of beam tests carried out at Fermilab have shown that the detector has the required energy resolution to accomplish sPHENIX’s physics goals; additionally, in order to optimize the performance of the calorimeter, towers will be constructed out of tiles with similar behavior. Testing has begun at Georgia State University to characterize the performance of each individual tile relative to a baseline reference by analyzing their response to cosmic rays. This poster will detail the design of the test setup, the analysis procedure, and the current results of the performance characterization studies of the sPHENIX HCal tiles.
- Title: sPHENIX EMCal design, construction and test beam results [SUBMITTED]
- Possible presenter: Timothy Rinn
- Abstract: The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) is designed to accurately study proton-proton, proton-nucleus, and nucleus-nucleus collision systems. The design of sPHENIX, including full azimuthal calorimeter coverage, will allow it to precisely study properties of the Quark Gluon Plasma through open heavy flavor production, jet modification, and Upsilon measurements. It will also perform a variety of cold QCD studies. Helping to enable the broad measurement capabilities of sPHENIX is the Electromagnetic Calorimeter (EMCal), which is the primary detector for identifying and measuring the energy of photons and electrons. The EMCal is constructed of scintillating fibers embedded in blocks of tungsten powder in an epoxy matrix, with the emitted light collected with acrylic light guides and read out through Silicon Photomultipliers (SiPMs). This poster will discuss the design and construction of the EMCal as well the results from a 2018 Beam Test.
- Title: Uniform readout system for the sPHENIX electromagnetic and hadronic calorimeters [SUBMITTED]
- Possible presenter: Eric J. Mannel
- Abstract:
- The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will provide a detailed understanding of the evolution of the Quark-Gluon Plasma using precision measurements of jets and heavy flavors in heavy ion collisions at RHIC. The sPHENIX detector is based on the former BaBar 1.5T super-conducting solenoid and consists of precision tracking, electromagnetic (EMCal) and hadronic (HCal) calorimetry covering 2π in azimuth and |η| < 1.1. The EMCal is a 2D projective calorimeter consisting of scintillating fibers embedded in a tungsten powder infused epoxy. The HCal is a 2D projective design using tilted plates consisting of steel absorber and scintillating tiles with wave-shifting fibers. Both the EMCal and HCal calorimeters use a common electronics design for readout based on silicon photomultipliers (SiPMs) as the optical sensor. A custom designed analog front-end provides amplification and shaping for the 14-Bit ADC system designed specifically for sPHENIX which digitizes and records the waveforms for all of the 24576 EMCal and 1526 HCal towers. In addition, the digitizer system provides trigger primitives for the sPHENIX trigger system. We will present an overview of the design of the calorimeter electronics, status of the design and prospects for sPHENIX.
- Title:
- Title:
- Title: sPHENIX EMCal module prototyping and production plan in China [SUBMITTED]
- Possible presenter: Weihu Ma
- Abstract:
- The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will probe the strongly interacting Quark-Gluon Plasma (QGP) with jets, heavy flavor tagged jets and Upsilon production. The sPHENIX electromagnetic calorimeter (EMCal) detector is essential for these measurements. The Chinese sPHENIX EMCal Consortium includes groups from Fudan, PKU and CIAE, and the consortium is planning to build sPHENIX EMCal modules covering the pseudorapidity range ±(0.8–1.1), significantly extending the experimental acceptance and greatly enhancing the physics capability for jets and Upsilon measurements. We will show the status of the Chinese prototyping project including investigations on the quality of tungsten powder from Chinese vendors and the quality assurance procedures under development. We will also report on the status of our development of a machine to precisely place scintillating fibers automatically.
- Title: SiPM testing for the sPHENIX electromagnetic and hadronic calorimeters [SUBMITTED]
- Possible presenter: Balazs Ujvari
- Abstract: The electromagnetic (EMCal) and hadronic (HCal) calorimeters for the sPHENIX
- experiment will use about 100,000 silicon photomultipliers (SiPMs) as optical sensors (Hamamatsu S12572-33-015P). The effects of radiation damage in SiPMs from gamma rays has been measured and compared with the damage produced by neutrons. We have designed and constructed an automated SiPM testing device that measures the breakdown voltage and gain curve with the IV scan and SPS (single photon spectrum) method. It is being used to characterize SiPMs for the sPHENIX calorimeters and to prepare a database for SiPM sorting. We will report on the first months of operational experience, including precision, stability and reproducibility of the measurements, consistency with the available factory data, and the projected effect of the SiPMs on the overall calorimeter performance in sPHENIX.
- Title: sPHENIX capabilities for measuring Λ$$_c$$ production in Au+Au collisions [SUBMITTED]
- Possible presenter:
- Abstract: A strong enhancement of Λ$$_c$$/D$$^0$$ ratio compared to the fragmentation baseline is observed in Au+Au collisions at the top energy of the RHIC. This also suggests that Λ$$_c$$ may be an important component for the total charm cross section. Precision measurements of charm baryons over a broad momentum range are needed for a detailed understanding of hadronization and parton energy loss mechanisms as well as to characterize QGP transport properties. sPHENIX is a planned next-generation high-rate jet, Upsilon and open heavy-flavor detector at RHIC. A state-of-the-art MAPS-based silicon detector (MVTX) is proposed to enhance heavy flavor detection capabilities greatly. We will present simulation studies of Λ$$_c$$ baryon measurements in 200 GeV Au+Au collisions utilizing the full sPHENIX tracking capabilities with MVTX. The simulation method for estimating the expected signal and background will be discussed. Statistical projections of the Λ$$_c$$/D$$^0$$ ratio will be presented.
- Title: The sPHENIX heavy flavor jet physics physics program [SUBMITTED]
- Possible presenter: (HF topical group) , Jin Huang
- Abstract: Jets initiated by the fragmentation of heavy flavor quarks (HF-jet) are sensitive to collisional energy loss of the high energy parton when traversing through Quark Gluon Plasma. Using the state-of-the-art jet detector at RHIC, sPHENIX, we will perform the first HF-jet measurement at RHIC, which includes the nuclear modification and flow of b-jets, and the momentum balance in di-b-jet pairs. A variety of b-jet tagging algorithms have been developed, which select a HF-jet sample rich in tracks displaced from the primary collision point as measured by the high precision MAPS vertex tracker for sPHENIX. The detection method, physics projection and possible impacts to the field of heavy ion physics will be presented.
- Title: The sPHENIX open heavy flavor hadron physics program [SUBMITTED]
- Possible presenter: (HF topical group) , Xin Dong
- Abstract: Recent data from RHIC and LHC show that $$\mathrm{R}_\mathrm{AA}$$ and $$\mathrm{v}_2$$ of charm hadrons are very similar to that of light and strangeness hadrons. The $$\mathrm{R}_\mathrm{AA}$$ of bottom decay daughters at low p$$_\mathrm{T}$$ seems to be less suppressed than that of light and charm hadrons, suggesting a mass suppression hierarchy. Precision open bottom measurements over a broad momentum range are needed for a detailed understanding of parton energy loss mechanisms and to characterize the transport properties of the strongly-coupled QGP medium. The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will have extensive capabilities for jet and Upsilon measurements. A fast MAPS-based silicon vertex detector (MVTX) is proposed to greatly enhance the heavy flavor detection capabilities of sPHENIX. We will present physics simulation studies on the open bottom measurements within the full sPHENIX tracking environment including the MVTX detector. Open bottom reconstruction has been explored via the inclusive non-prompt $$\mathrm{D}^0$$ daughters and the full exclusive reconstruction of $$\mathrm{B}^+\rightarrow\bar{\mathrm D}^0\pi^+$$. Statistical projections on the nuclear modification factor and the elliptic flow measurements will be presented.
- Title: The sPHENIX MAPS-based vertex detector [SUBMITTED]
- Possible presenter: (MVTX group), Ming Liu
- Abstract:The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will study QGP properties with heavy bottom quark jets (B-jets) produced in high-energy heavy ion collisions. B-jets are expected to offer a unique set of observables due to the large bottom quark mass, but need to be measured across an unexplored kinematic regime, particularly at low pT where the expected mass-dependence effects are large but the underlying backgrounds are also high. We will use a three-layer Monolithic-Active-Pixel-Sensor (MAPS) based vertex detector, originally developed for the ALICE ITS upgrade, to identify the signal and suppress the background. The MVTX will serve as the innermost tracking system of sPHENIX, covering 2 cm to 4 cm radially and a pseudorapidity range of |η| < 1.1. The very fine 27 µm x 29 µm pixels allow us to identify B-decay secondary vertices and B-jets in heavy ion collisions with high efficiency and high purity. In this presentation, we show the current status of R&D efforts towards custom readout and mechanical systems to integrate the MVTX detector into the sPHENIX system.
- Title: The readout of the sPHENX MAPS vertex detector [SUBMITTED]
- Possible presenter: (MVTX group), Alex Tkatchev
- Abstract: The MVTX detector will serve as the inner tracker of the sPHENIX experiment at RHIC. It is an extremely precise silicon pixel vertex detector, with excellent displaced secondary vertex detecting capabilities. The MVTX will enable key measurements of heavy-flavor-tagged jets and B-mesons in heavy ion collisions. The detector is based on the latest generation of Monolithic Active Pixel Sensors (MAPS) technology, developed for the ALICE collaboration at CERN. The readout chain is composed of three parts: a sensor stave assembly, a RU (Readout Unit) board, and a FELIX (Front End LInk eXchange) board. The stave assembly consists of nine ALPIDE (ALice PIxel DEtector) sensor chips, which will send its data on nine gigabit links over a FireFly cable to an RU board. The RU board consists of two FPGAs, one for reading the stave data and sending data using CERNs rad-hard GBT links over fiber to the FELIX board and a second FPGA which is used for scrubbing (SEU detection). The FELIX board consists of an FPGA that reads out the data over the fiber link and sends its data to a 16 lane PCIe interface, placing the data to disk. We will present the latest R&D efforts and performance achievements of the three parts of the Readout system mentioned above.
- Title: sPHENIX MAPS prototype test beam results [SUBMITTED]
- Possible presenter:(MVTX group), Cameron Dean
- Abstract: The sPHENIX MVTX detector will be a state-of-the-art monolithic active pixel (MAPS) vertex detector, used by the sPHENIX collaboration, which will allow the study of heavy flavor physics within heavy ion collisions at RHIC. The detector is at an advanced stage of testing with several test beam activities having taken place through 2019. Three test beams have been performed since 2018 to evaluate the physics readiness, the integration of the system with other detectors within sPHENIX (both using four staves, two readout boards and one front end link exchange), and the demonstration of the full readout capability of the minimal detector segment (using eight staves, eight readout boards and one front end link exchange) is expected to be complete by the end the summer of 2019. The results of these tests are being used to drive the collaboration to production-readiness in late 2019 while simultaneously evaluating the track reconstruction software that will be used within the heavy flavor environment experienced by the MVTX.
- Title: Mechanical design of the sPHENIX MAPS-based vertex detector [SUBMITTED]
- Possible presenter:(MVTX group), Jason Bessouille, Joseph Dodge, James Kelsey, Camelia Mironov, Walter Sondheim
- Abstract: The sPHENIX experiment will study the QGP properties with heavy bottom quark jets (b-jets) produced in high-energy heavy ion collisions, in the challenging low-pT regime, where the expected mass-dependence effects are large but the underlying backgrounds are also high. Key to identifying such jets is the 3-layer Monolithic-Active-Pixel-Sensor(MAPS) based vertex detector, originally developed for the ALICE ITS upgrade. The MVTX will serve as the innermost component of the sPHENIX tracking system, covering 2 cm to 4 cm radially and a pseudorapidity range of |η| < 1.1. Although it uses the same sensor elements and basic geometry, many aspects of the mechanical systems had to be adapted from the original ALICE versions. We present the current status of the detector design, highlighting the changes made to integrate the MVTX into the sPHENIX detector.
- Title: Beam test results of the sPHENIX HCal prototype [SUBMITTED]
- Possible presenter:
- Abstract: The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will quantify the properties of quark-gluon plasma created in relativistic heavy ions collisions with a focus on the measurements of jets and Upsilon states. A crucial component to the sPHENIX detector design for jet measurements is the hadronic calorimeter (HCal) which is located outside of the solenoid magnet and composed of alternating layers of tapered steel plates and scintillator tiles. sPHENIX has performed four tests of the HCal prototypes at Fermilab since 2015 and pre-production design of the EMCal and HCal in the η∼1 configuration was tested at the Fermilab Test Beam Facility as experiment T-1044 in the spring of 2018. We will present the results of 2018 HCal prototype beam test, the results of sPHENIX-like calorimeter system and corresponding GEANT4 simulations. The energy linearity and resolution of pions and electrons will also be presented.
- Title: Streaming readout of the sPHENIX detector [SUBMITTED]
- Possible Presenter: NN
- The sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will enable a comprehensive measurement of jets in relativistic heavy ion collisions. The detector will cover the full azimuth and a pseudorapidity range of |η| < 1.1. The tracking system will consist of a silicon detector (MVTX) based on MAPS (Monolithic Active Pixel Sensors), followed by an Intermediate Tracker (INTT), and then by a TPC. The calorimetry system consists of an electromagnetic calorimeter, and, for the first time at a RHIC experiment, a mid-rapidity hadronic calorimeter.
- The calorimeter signals are sampled with silicon photomultipliers and waveform digitizing electronics. The digitized waveforms are read out with custom PCIe boards in a ``classic'' event-driven scheme. Conversely, the three tracking detectors are read out in streaming mode, where data are pushed from the front-end and captured continuously. Only streaming data overlapping with RHIC beam crossings that were triggered for the calorimeter readout are permanently stored.
- Streaming readout is widely believed to be the readout method best suited for the detectors at a future Electron-Ion Collider. A sPHENIX TPC prototype has successfully been read out with near-final readout electronics at the Fermilab test beam in streaming mode. The analysis of the streaming data is under way. We will give an overview of the streaming readout technology and present the advantages of the technology, and highlight results from the test beam.
- Title: Testbeam Results for the sPHENIX TPC Prototype [SUBMITTED]
- Possible Presenter: Henry Klest
- Abstract: A Time Projection Chamber (TPC) will be the central tracking detector in the sPHENIX experiment. Its main task is to provide a high tracking efficiency and excellent momentum resolution for precise upsilon spectroscopy and jet measurements. The TPC will cover the full azimuth and a pseudorapidity range of up to $\pm$ 1.1.
- A small scale prototype TPC with a radial extension of 40 cm and a similar drift length has been manufactured which can accommodate a full size amplification module as for the sPHENIX TPC.
- The prototype has been exposed to a 120 GeV proton beam at the Fermilab Test Beam Facility (FTBF). The results of the test-beam campaigns including SAMPA readout electronics will be presented.
- Title: Central Membrane Studies for the sPHENIX TPC [SUBMITTED]
- Possible Presenter: Vicki Greene
- Abstract: sPHENIX is an ongoing upgrade to the PHENIX detector which is planned to explore the quark-gluon plasma formed in heavy ion collisions through the measurements of jets and Upsilons at RHIC in the 2020’s. The experiment will feature a charged particle tracking system along with electromagnetic and hadronic calorimeters and also a 1.4 Tesla superconducting solenoid magnet. A TPC with a GEM-based readout will form the core of the sPHENIX tracking system. The central membrane of the TPC is an important part of the TPC and several simulation studies ranging from tracking performance of single particles to jet fragmentation studies were done with different proposed designs of the TPC membrane. The details of these extensive simulation studies on the sPHENIX TPC membrane will be presented here.
- Title: Ion Backflow Studies for the sPHENIX TPC [SUBMITTED]
- Possible Presenter: John Harris
- Abstract: A Time Projection Chamber is the main tracking system for the proposed sPHENIX experiment at RHIC. It will measure space points of charged tracks, which provide the needed momentum resolution to separate the Upsilon states in decays to electrons and positrons.
- The strong magnetic field of the solenoid previously used in the BaBAR experiment, a Neon-based fast gas mixture, and an electric field providing a high drift velocity will mostly compensate for E-field distortions due to ion backflow in the current sPHENIX TPC design. A quadruple GEM stack with special hole patterns or a MicroMegas based amplification is expected to further reduce the ion backflow.
- A series of simulations and measurements have been performed to find an optimal configuration and working point for the sPHENIX TPC. In this presentation, we discuss the outcome of this study.
- Title: Readout electronics for the sPHENIX Time Projection Chamber [SUBMITTED]
- Possible Presenter: TBD
- Abstract: One of the major physics goals of the sPHENIX experiment at RHIC
- is to measure the Upsilon states with 100MeV mass resolution. In order to
- achieve this resolution, a Time Projection Chamber (TPC) was proposed
- for momentum measurements of electrons and hadrons. The TPC does
- not have a gating grid similarly to the ALICE TPC case and therefore
- capable for handing the collision rate of up to a few hundreds kHz.
- In turn, the charge has to be readout continuously. The readout
- electronics was newly designed to meet this requirement. The signal is
- readout by 624 Frontend cards that have 8 SAMPA v5 chips, the new
- version of the one employed for ALICE TPC, and sent to a backend
- electronics, FELIX PCI card, designed for ATLAS experiment. The data
- rate from the whole TPC may reach as much as 1.4Tbps. We will show
- the readout scheme for the TPC and the performance from the prototype
- boards as well as the data reduction scheme.
Proposed talks
Proposed posters