Forward Hadron Research Articles

Application of the VMM ASIC for SiPM-based calorimetry

Highly integrated multichannel readout electronics is crucial in contemporary particle physics experiments. A novel silicon photomultiplier readout system based on the VMM3a ASIC was developed, for the first time exploiting this chip for calorimetric purposes. To extend the dynamic range the signal from each SiPM channel was processed by two electronics channels with different gain. A fully operational prototype system with 256 SiPM readout channels allowed the collection of data from a prototype of the ALICE Forward Hadron Calorimeter (FoCal-H Prototype 2). The design and the test beam results using high energy hadron beams are presented and discussed, confirming the applicability of VMM3a-based solutions for energy measurements in a high rate environment.

A 2K Design for the Low Beta Quadrupoles Q1ApF/Q1BpF for the Interaction Region of the Electron-Ion Collider (EIC)

The forward hadron magnets of the planned electron-ion collider (EIC) at Brookhaven National Laboratory (BNL) present a set of unique challenges. In addition to the typical magnet requirements in terms of aperture, gradient, and field quality, the field leakage from the hadron magnets to the electron apertures must be negligible. Due to the close proximity of the two apertures the shielding solution for the electron beam can affect the field quality of the hadron magnets. <p xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">In this paper, a design for the Q1ApF/Q1BpF low beta quadrupoles based on NbTi Rutherford cable operating at 2K is presented. In this design the electron beam shielding and the required field quality in the hadron magnets are achieved using a set of cutouts in the iron yoke solely without resorting to active shielding. The chosen layout along with the key parameters are presented and their effect on hadron magnets in term of field quality and operational margins are also discussed.

Forward inclusive jet productions in pA collisions

Motivated by recent experimental LHC measurements on the forward inclusive jet productions and based on our previous calculations on forward hadron productions, we calculate a single inclusive jet cross section in $pA$ collisions at forward rapidity within the color glass condensate framework up to the next-to-leading order. Moreover, with the application of a jet algorithm and proper subtraction of the rapidity and collinear divergences, we further demonstrate that the resulting next-to-leading-order hard coefficients are finite. In addition, in order to deal with the large logarithms that can potentially spoil the convergence of the perturbative expansion and improve the reliability of the numerical predictions, we introduce the collinear jet function and the threshold jet function and resum these large logarithms hidden in the hard coefficients.

Simulation study of Dual-Readout Calorimeter for a forward calorimeter at the Electron-Ion Collider

The Electron-Ion Collider (EIC) is a future particle accelerator to be built at the Brookhaven National Laboratory, and the primary purpose of experiments at the EIC is to resolve the question of partonic structure of nucleons and nuclei. To achieve the physics goals of the EIC, a hadron calorimeter of high energy resolution is required at forward rapidity. A Dual-readout Calorimeter (DRC) which has been developed for future collider experiments is considered as an upgrade option of the forward hadron calorimeter for the ECCE experiment at the EIC. The DRC consisting of two types of optical fiber, Cherenkov and Scintillation fibers, can achieve high energy resolution by measuring a fraction of electromagnetic shower in a hadronic shower. A performance study of DRC for the EIC such as geometry, material, and energy resolution is ongoing based on the existing simulation framework for high energy experiments, and the DRC simulation details will be transported to the EIC simulation framework. In this presentation, we will introduce the simulation study of the DRC for the EIC.

Upgrade of the BM@N detector for studies of heavy ion interactions

In the next years the Baryonic Matter at Nuclotron (BM@N) experiment at Joint Institute for Nuclear Research (JINR) will carry out the physics program with heavy ion beams with energies up to 3.9 AGeV and intensities up to 2 [Formula: see text] ions/s. The experiment is devoted to measure observables sensitive to the equation of state of dense baryonic matter. To meet this goal the existing BM@N set-up will be upgraded with fast hybrid tracking system, which includes beam tracking detectors, a large aperture silicon tracking system, gas electron multiplier stations and cathode strip chambers. The measurement of the event plane and centrality will be achieved with a forward hadron calorimeter and granular hodoscopes. The physics program and configuration of the upgraded BM@N set-up are presented.

Commissioning of the readout chain of the CBM Projectile Spectator Detector at FAIR

The forward hadron calorimeter Projectile Spectator Detector (PSD) will be used at the CBM experiment at FAIR to measure the nucleus-nucleus collision centrality and orientation of the reaction plane. The PSD is a sampling lead/scintillator calorimeter with modular transverse structure and longitudinal segmentation of modules. Light readout from all sections of each module is provided by Hamamatsu MicroPixel Photon Counters installed at the rear of the module. The full chain of the Front-End and readout electronics of one PSD module — mPSD has been assembled, integrated into mCBM (mini-CBM) trigger-less data acquisition system and tested at mCBM test runs in Summer 2021. The PSD Front-End and readout electronics integration into mCBM within the common synchronized CBM data transport system is discussed.

Commissioning of new FHCal at BM@N experiment

The BM@N (Baryonic Matter at Nuclotron) is the fixed target experiment at NICA-Nuclotron (JINR, Dubna, Russia) accelerator complex. The main goal of the experiment is studying the properties of dense nuclear matter produced in ion-ion collisions at the energies of up to 4 AGeV. New Forward Hadron Calorimeter (FHCal) with modular structure and a beam hole in the center has been developed and constructed to measure the collision centrality after the BM@N upgrade. The transverse and longitudinal segmentation of the FHCal allows to perform calibration of the calorimeter with cosmic muons.FHCal modules have lead/scintillator sampling structure with longitudinal segmentation. Light signals from the sections are collected with MPPCs, amplified and read-out by ADC boards. Fast analog signals are collected for trigger system.The status of development and construction of the new FHCal calorimeter for the BM@N experiment is presented. Performance of FHCal front-end and readout systems is discussed.

Single inclusive jet production in pA collisions at NLO in the small-x regime

We present the first complete next-to-leading-order (NLO) prediction with full jet algorithm implementation for the single inclusive jet production in pA collisions at forward rapidities within the color glass condensate (CGC) effective theory. Our prediction is fully differential over the final state physical kinematics, which allows the implementation of any infra-red safe observable including the jet clustering procedure. The NLO calculation is organized with the aid of the observable originated power counting proposed in [1] which gives rise to the novel soft contributions in the CGC factorization. We achieve the fully-differential calculation by constructing suitable subtraction terms to handle the singularities in the real corrections. The subtraction contributions can be exactly integrated analytically. We present the NLO cross section with the jets constructed using the anti-kT algorithm. The NLO calculation demonstrates explicitly the validity of the CGC factorization in jet production. Furthermore, as a byproduct of the subtraction method, we also derive the fully analytic cross section for the forward jet production in the small-R limit. We show that in the small-R approximation, the forward jet cross section can be factorized into a semi-hard cross section that produces a parton and the semi-inclusive jet functions (siJFs). We argue that this feature holds for generic jet production and jet substructure observables in the CGC framework. Last, we show numerical analyses of the derived formula to validate our calculations. We justify when the small-R approximation is appropriate. Like forward hadron production, the obtained NLO result also exhibits the negativity of the cross section in the large jet transverse regime, which signals the need for the threshold resummation. A sketch of the threshold resummation in the CGC framework is presented based on the multiple emission picture and it is found to agree with the approach using the rapidity renormalization group equation developed in [2].

ML Approaches for Centrality Determination with Forward Hadron Calorimeters in Heavy Ion Reactions

ML Approaches for Centrality Determination with Forward Hadron Calorimeters in Heavy Ion Reactions

Measurements of Spectators with Forward Hadron Calorimeter in MPD/NICA Experiment

Measurements of Spectators with Forward Hadron Calorimeter in MPD/NICA Experiment

Application of FHCal for Heavy-Ion Collision Centrality Determination in MPD/NICA Experiment

Two approaches related to the centrality determination in heavy-ion Multi-Purpose Detector (MPD) experiments, using charge-particles multiplicity in Time Projection Chamber (TPC) and the energy deposition in Forward Hadron Calorimeter (FHCal) are discussed. The main features of the FHCal are the fine transverse segmentation and the beam holes in the center of the calorimeters. Leaking the heavy non-interacting fragments (spectators) leads to ambiguity in the dependence of energy deposition in the FHCal on the collision centrality. However, the calorimeter transverse segmentation allows one to measure the energy distributions in each of the FHCal modules and to construct combined observables to resolve the problems associated with the beam hole. The comparison of these approaches in the collision centrality measurements is discussed.

Synergy in the Development of Forward Hadron Calorimeters for NA61/SHINE, BM@N, MPD and CBM Experiments

Synergy in the Development of Forward Hadron Calorimeters for NA61/SHINE, BM@N, MPD and CBM Experiments

Development of readout chain for CBM Projectile Spectator Detector at FAIR

The Compressed Baryonic Matter (CBM) experiment at FAIR needs a detector to measure the nucleus-nucleus collision centrality and orientation of the reaction plane. The Projectile Spectator Detector (PSD) as a sampling lead/scintillator forward hadron calorimeter with transverse and longitudinal segmentation will be used for this purpose. The PSD consist of 44 modules with 10 longitudinal sections in each. Electronics of PSD consist of MPPCs boards mounted directly on detector and readout ADC interface with ADC FPGA board installed into crate distanced on 50m from detector part. ADC has 14-bit resolution and 125MHz digitization rate, Kintex-7 FPGA is placed on the board. Concept of PSD Front End Electronics (FEE) is already designed and most crucial parts including ADC FPGA board already tested and confirmed to be operational. One PSD module (”mini PSD” or mPSD) has been installed into the “mini CBM” (mCBM) assembled at SIS18 accelerator in GSI, Darmstadt, Germany in the framework of the FAIR Phase-0 program. ADC FPGA readout board has been integrated into common DAQ experiment and tested. Details of the mPSD FEE design and test results are shown.

Calibration of FHCal with cosmic muons at the BM@N experiment

The forward hadron calorimeter (FHCal) is one of the sub-detectors of the BM@N experimental setup at JINR, Dubna. It consists of 54 lead-scintillator “sandwich” type modules of two types with the transverse sizes 20 × 20 cm 2 and 15 × 15 cm 2. These two types of modules are subdivided into 10 and 7 individual longitudinal sections, respectively. Each section provides the independent light and amplitude signal readout with one silicon photomultiplier (MPPC). High signal to noise ratio of MPPC allows to detect cosmic rays with low energy depositions in FHCal longitudinal sections. A method for cosmic muon track reconstruction is discussed. A procedure for energy calibration based on muon track length and energy deposition in each section is proposed. Experimental results of FHCal cosmic calibration are presented.

Application of Machine Learning methods for centrality determination in heavy ion reactions at the BM@N and MPD@NICA

Forward hadron calorimeters in heavy ion experiments are used to determine the centrality and orientation of reaction plane in nucleus-nucleus collisions. In BM@N and MPD@NICA experiments hadron calorimeters with a beam hole in the center will be used, which is motivated by high radiation doses at the BM@N and by the design of the MPD collider experiment. This feature makes it impossible to determine centrality from only the total energy deposition in the calorimeters. Therefore, an approach using machine learning methods was developed to solve the centrality problem. This approach uses information on the energy distribution of particles over the calorimeter surface. The report is dedicated to the description of the new approach for centrality determination. The results of applying the approach to the simulation data of the BM@N and MPD@NICA experiments will be shown.

Development of Detector Control System (DCS) for forward hadron calorimeters in the BM@N and the MPD experiments

The BM@N and the MPD experiments at NICA facility (Dubna, Russia) will use the forward hadron calorimeters (FHCal) for centrality and reaction plane determination in the heavy ion collisions. The FHCal is a modular lead/scintillator sampling calorimeter with longitudinal segmentation. The light from each longitudinal section in module is detected with one silicon photomultiplier (MPPC) with sensitive area of 3x3mm2. In total, the FHCal at the BM@N experiment has 438 readout channels, while two MPD calorimeter arms have 616 readout channels. This article shows the DCS design with hardware and software development for these calorimeters. The DCS will be used to control and correct the bias voltages with temperatures of MPPCs. An integration into the main DCS systems for both experiments are discussed.

CMS HF Dedektöründe Kullanılan Fiberlerin Radyasyondan Gördüğü Zararı Görüntüleme Sistemi

İleri Hadron (HF) dedektörü, Compact Muon Solenoid (CMS) deneyinin her iki yanında bulunup, CMS'nin çok ileri bölgedeki pseudorapidite (3.0 &amp;lt; | η | &amp;lt; 5.0) aralığını kapsar. Her bir HF modülü, demir soğurucuların uzunluğu boyunca ışın demeti eksenine paralel uzanan kuvars liflerinden yapılmıştır. HF, ışın eksenine yakın olduğu için yüksek düzeyde radyasyona maruz kalır. Ve yüksek radyasyon etkisi nedeniyle, kuvars fiberler zamanla bozulmaya başlar. Bu radyasyon etkisini belirlemek için HF detektörüne bazı özel fiberler yerleştirilmiştir. Radyasyonun neden olduğu hasarı izlemek için toplam 56 fiber kanalı kullanılmıştır. Bu çalışma, HF'nin radyasyon hasarının izlenmesi için 2010 yılı çalışma döneminde alınan yerel lazer verileri kullanılarak yapılmıştır. Belirli bir pseudorapidite ve azimutal açıda RadDam kanallarında önemli bir radyasyon hasarı gözlenmemiştir.

Performance of Forward Hadron Calorimeter at MPD/NICA

Forward Hadron Calorimeter is a part of MPD experiment setup at NICA beam facility. FHCal structure and purpose are presented in this proceedings. Methods of collision centrality and event plane reconstruction are discussed. Simulation, beam test results and production status are presented.

The readout system of the CBM Projectile Spectator Detector at FAIR

The Projectile Spectator Detector (PSD) is a sampling lead/scintillator forward hadron calorimeter with transverse and longitudinal segmentation and with MPPC photodetectors light readout. The PSD will be used at the Compressed Baryonic Matter (CBM) experiment at FAIR to measure the nucleus-nucleus collision centrality and orientation of the reaction plane. The CBM experiment will use a free-streaming data acquisition system (DAQ), which requires a coordinated time stamping of data in all sub-systems. To test prototypes of the CBM sub-detectors, front-end electronics (FEE) and readout electronics at high heavy ion beam rates the “mini CBM” (mCBM) installation has been assembled at SIS18 accelerator in GSI, Darmstadt, Germany in the framework of the FAIR Phase-0 program. A single “mini PSD” (mPSD) module has been integrated into the mCBM experiment. Details of the mPSD readout electronics and the first results of the data acquisition, processing and transmission within the common synchronized mCBM data transport system taken during the first beam tests are shown.

Methods for centrality determination in nucleus-nucleus collisions with forward hadron calorimeters at the BM@N experiment

The BM@N (Baryonic Matter at Nuclotron) is the fixed target experiment at the Nuclotron (JINR, Dubna, Russia) accelerator complex. The main goal of the BM@N experiment is studying properties of dense nuclear matter produced in the ion-ion collisions at beam energies up to 4.5 AGeV. First experiments were done for carbon, argon and krypton ions beams with C, Al, Cu and Pb targets. The methods of central events selection on event-by-event base with ZDC (Zero Degree Calorimeter) for these reactions are presented. The new Forward Hadron Calorimeter (FHCal) with transverse and longitudinal segmentation will be used to measure the collision centrality in heavy ion experiments after the BM@N upgrade. The FHCal has the beam hole in the center due to expected high beam intensities. New forward quartz hodoscope is been developed to be placed in the beam hole to measure the charge of fragments. New methods of centrality determination with the FHCal and forward quartz hodoscope are discussed.