Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session WW01: V: Analysis Techniques and Tools |
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Sponsoring Units: DPF Chair: Andre de Gouvea, Northwestern University Room: Virtual Room 1 |
Wednesday, April 26, 2023 8:00AM - 8:12AM |
WW01.00001: Online Luminosity Measurements at CMS during LHC Run-3 Warusapperuma Don Nimmitha Karunarathna The CMS experiment at the Large Hadron Collider (LHC) utilizes several detectors and counting methods that are independent of each other with the goal to obtain precision luminosity calibration with a relative uncertainty of about 1%. The instruments used for online luminometry include the pixel luminosity telescope and the fast beam conditions monitor, both using silicon sensors and operated independently of CMS, as well as the hadron forward calorimeter, and the drift tube muon detectors. These CMS sub-detectors measure the instantaneous luminosity for each LHC bunch crossing, using zero-counting, rate scaling or energy sum algorithms. The calibration constants, called visible cross section, are obtained for each detector with beam-separation scans analysed by the van der Meer method. In this talk, I will present the performance of the online luminosity detectors during the 2022 data taking period. |
Wednesday, April 26, 2023 8:12AM - 8:24AM |
WW01.00002: Testing of GE2/1 & ME0 GEM detectors for CMS Phase-2 Muon System Upgrade Bandar Alsufyani The instantaneous luminosity of the Large Hadron Collider will be increased by half an order of magnitude as part of the High Luminosity upgrade. The endcap muon system of the Compact Muon Solenoid experiment (CMS) is being upgraded with new stations (called GE2/1 and ME0) of triple-gas electron multiplier (GEM) detectors to keep up with the expected higher Level-1 muon trigger rates. For prototypes of both subsystems, we will discuss the high and low voltage implementation, readout performance, and the optimization of grounding connections. The high and low voltages are supplied by a CAEN SY5527 power supply with logging software to monitor the voltages and currents over time to check for current leaks or sparks. The high light output of QSFP modules in the backend was identified as the root cause of a dropped data problem between the backend and the frontend, and long-term Forward Error Correction (FEC) tests proved this was indeed the issue. Several tests of the grounding configurations on ME0 with and without a detector cover gave 0.61 fC ENC and 0.36 fC ENC noise levels, respectively. |
Wednesday, April 26, 2023 8:24AM - 8:36AM |
WW01.00003: Calibration of the ATLAS New Small Wheel Front End Electronics in 2022 Laura E Bruce For the Large Hadron Collider's (LHC) third period of data taking, known as Run 3, the LHC ATLAS detector replaced its two inner end-cap muon subsystems with the New Small Wheels (NSW) that employ novel detector technologies. Leading to the start of Run 3 in July 2022, significant work in data acquisition (DAQ) of the NSW needed to be accomplished. This presentation focuses on a radiation-hard data transceiver ASIC, the GBTx, that is responsible for bidirectional data transmission of the thousands of readout channels of the NSW. It discusses the calibration developed to validate the GBTx clock phases used for data taking in both the NSW Micromegas and Small Thin Gap Chamber technologies and its results. It is imperative that the phase used by the GBTx is well-set for uncorrupt data transmission. Operational experiences at the beginning of Run 3 will also be discussed. |
Wednesday, April 26, 2023 8:36AM - 8:48AM |
WW01.00004: Construction and Performance of a Large Area GEM detector with Low Mass and Zigzag-strip Readout Merrick S Lavinsky, Marcus Hohlmann, Jared Hadley We present the construction of a low-mass, low cost, large area GEM detector and its performance in a 120 GeV proton beam. This design is optimized for forward tracking in the future Electron Ion Collider (EIC) by reducing multiple scattering via decreased material budget. In the forward and backward regions, tracking resolution is critical for reconstruction and identification; but is diminished with multiple scattering through high Z materials. This design uses seven times less material than a standard Triple GEM (TGEM) installed in the CMS muon end-cap. To meet the low material budget, the drift and readout electrodes are manufactured on foils instead of PCBs. The drift, TGEM, and readout foils are enclosed in two trapezoidal carbon fiber frames with aluminized polyimide foil windows. The frames are cut from a contiguous carbon-fiber plate and include a support beam in the center, parallel to the base, to protect the drift from potential window sagging. To further protect the drift electrode, the aluminized inner side of the window is held at the same voltage to decrease the attractive coulomb force. This design shows comparable gas gain and HV stability to a common GEM. The readout strips were chosen to have a radial zigzag geometry to decrease the number of channels; hence the associated cost of manufacturing, while still maintaining optimal spatial resolution. This design was tested at FermiLab's Proton Test Beam facility and the data is currently being analyzed for its angular resolution as a function of sector and zigzag dimensions. At present, the average strip multiplicity of the straight strip section is 4 at an applied voltage of 4.4kV. |
Wednesday, April 26, 2023 8:48AM - 9:00AM |
WW01.00005: RADiCAL, Ultracompact, Precision Timing, Radiation Hard Electromagnetic Calorimetry Randal Ruchti, Thomas Anderson, Thomas Barbera, Nehal Chigurupati, Bradley Cox, Paul Debbins, Max Dubnowski, Maxwell Herrmann, Chen Hu, Kiva Ford, Colin P Jessop, Ohannes Kamer-Koseyan, Alexander Ledovskoy, Yasar Onel, Carlos Perez Lara, Daniel Ruggiero, Daniel Smith, Mark Vigneault, Yuyi Wan, Mitchell R Wayne, James Wetzel, Liyuan Zhang, Renyuan Zhu To address the challenges of providing high performance calorimetry in future hadron collider experiments under conditions of high luminosity and high radiation (FCC-hh environments), we are conducting R&D on advanced calorimetry techniques suitable for such operation, based on scintillation and wavelength-shifting technologies and photosensor (SiPM and SiPM-like) technology. In particular, we are focusing our attention on ultra-compact radiation hard EM calorimeters, based on modular structures (RADiCAL modules) consisting of alternating layers of very dense absorber and scintillating plates, read out via radiation hard wavelength shifting (WLS) solid fiber or capillary elements to photosensors positioned either proximately or remotely, depending upon their radiation tolerance. The RADiCAL modules provide the capability to measure simultaneously and with high precision the position, energy and timing of EM showers. This paper provides an overview of the instrumentation and will present the latest results of timing resolution of a RADiCAL module in beam tests with electron beam at the Fermilab FTBF Test Beam Facility. |
Wednesday, April 26, 2023 9:00AM - 9:12AM |
WW01.00006: Design, Prototyping, and Construction of Cylindrical uRWELL Detector Pietro Iapozzuto, Marcus Hohlmann A cylindrical micro-Resistive-Well (µRWELL) detector, has been developed to provide precise directional information to help seed the DIRC cherenkov ring reconstruction for the Electron Ion Collider (EIC). The design features two independent half-cylindrical symmetrical sections that can be attached to each other to form a complete cylinder. Prototype components include the main frame (56 cm length, 13 cm radius) which provides a 3 mm drift gap space. a kapton drift foil, sealing inner and outer clamps, and a uRWELL/readout foil with U-V readout structure on composite prepreg base. Our design uses thin 3D- printed rigid materials, a copper-coated kapton foil, an inner and outer sealing clamps to create a rigid but low-mass inner main cylinder for the detector with a .07 percent radiation length in the active area. Furthermore a 10mm drift gap for use in micro-TPC mode was also developed. The main objectives are to demonstrate that a cylindrical µRWELL detector works and to quantify its tracking performance. |
Wednesday, April 26, 2023 9:12AM - 9:24AM |
WW01.00007: Construction and Performance of the Mu2e Charged Particle Tracker at Fermilab Truong M Nguyen The "Mu2e" experiment is now under construction at the Fermi National Accelerator Laboratory and when complete will search for the coherent muon-to-electron conversion with a sensitivity 10,000 times better than the current sensitivity. This large increase in sensitivity will probe many well motivated physics models beyond the standard model. Central to achieving this sensitivity goal is a very low mass high-speed charged particle tracker that can operate in high radiation and magnetic fields. The charged particle tracker must measure the 105 MeV/c conversion electron momentum with high precision and reject background mechanisms that can fake a conversion electron. The tracking system is made from more than 20,000 low-mass straw tubes which are built into tracker panels, these panels are assembled into 36 tracker planes that intercept the conversion electron helix. The Mu2e tracker design, construction status and performance of tracker panels will be presented. |
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