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eRD14 Consortium: An integrated program for particle identification (PID) for a future Electron-Ion Collider (EIC) detector

The EIC PID consortium (eRD14) has been formed to develop an integrated program for particle identification (PID) for a future Electron-Ion Collider (EIC) detector, for which excellent particle identification is an essential requirement. For instance, identification of the hadrons in the final state is needed for understanding how different quark flavors contribute to the properties of hadrons, and reliable identification of the scattered electron is important for covering kinematics where pion backgrounds are large. The PID systems also have the greatest overall impact on the layout of the central detector, and put important constraints on the magnetic field. It is thus essential to conduct the relevant R&D at an early stage of the development of a complete EIC detector. In addition to providing solutions addressing the broader EIC requirements, the PID consortium has worked closely with BNL and JLab to ensure that the specific R&D projects are compatible with the detector concepts that are being pursued there.

To address the different requirement associated with the three different parts of the detector (ion-beam direction, electron-beam direction, and central region), the consortium is pursuing R&D on (and requesting funding for) three different technologies for imaging Cherenkov detectors: a dual-radiator (gas/aerogel) RICH for the hadron endcap, a high-performance DIRC for the barrel region, a modular aerogel RICH (mRICH) for the electron endcap (which could also be used in the hadron endcap in conjunction with a single-radiator gas RICH such as the one developed by eRD6). A 4π time-of-flight (TOF) coverage is also needed for PID in the momentum range below the Cherenkov threshold and for bunch identification (which is important for ring-ring colliders with a high repetition rate), for which the consortium has performed R&D on mRPC and MCP-PMT based TOF systems.

Central Barrel

Outgoing Hadron-Side Endcap

The goal for this detector is to provide continuous ≥ 3σ hadron separation (π/K/p) from 2.5 to 50 GeV/c. The design uses outward-reflecting mirrors (similar to LHCb or HERMES) to extend the momentum coverage, in particular for the gas. A configuration with outward reflecting mirrors has the advantage of moving the focal-plane away from the beam and into the shadow of the barrel calorimeter, reducing backgrounds and requirements on the radiation hardness of the sensors, and allows light from the gas to reach the sensors without passing through the aerogel, which is a strong UV scatterer. The mirrors are divided into six sectors which greatly reduces the sensor area (Fig. 2.2.1) - which is the main cost driver for this type of detector. In fact, the total sensor area is determined essentially by the focal length of the mirror, which is the same for either inward or outward reflecting optics. In this study we benefited from the experience provided by several groups that have built similar devices in the past, and also by the CLAS12 RICH experience which is in progress.

Simulations were initially performed for a configuration using CF4 gas, for which the current layout is optimized, but the study showed that C2F6 is a better match for n=1.02 aerogel in that it provides continuous coverage (more than 3σ π/K separation: Fig 2.1.4) without having to use the gas as a threshold device.

Outgoing Electron-Side Endcap

Timing and Slow-Particle PID

Sensors and Electronics

eRD14 Reports

In this section, a collection of the eRD14 related documents which includes proposal, report, and presentation, are listed.




  • EIC R&D Proposal 2014

Prior 2014

eRD14 Presentations