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# 2015 Active Targets and TPC for Nuclear Physics Experiments Workshop

May 18 – 20, 2015
National Superconducting Cyclotron Laboratory
US/Michigan timezone

## Hyperon Time Projection Chamber for J-PARC experiments

May 19, 2015, 2:00 PM
25m
Lecture Hall (National Superconducting Cyclotron Laboratory)

### Lecture Hall

#### National Superconducting Cyclotron Laboratory

640 South Shaw Lane East Lansing, MI 48824
Oral Presentation Active target detectors and associated electronics

### Speaker

Dr Hiroyuki Sako (Japan Atomic Energy Agency)

### Description

We are developing a Hyperon Time Projection Chamber (HypTPC) as the main detector of two experiments at the J-PARC Hadron Facility. The J-PARC E42 experiment proposes to search for the H-dibaryon resonance in $\Lambda\Lambda$ production from $(K^{-},K{+})$ reactions off nuclei and the bound H-dibayron by its weak decays in order to answer the long-standing question about the existence of the H-dibaryon, which has a $"uuddss"$ quark configuration. The J-PARC E45 experiment approaches to fundamental understanding of non-perturbative QCD through high-precision data of baryon resonance spectra for $\pi N \to \pi \pi N$ and $\pi N \to K Y$ channels. Both experiments demand high-intense hadron beams of $10^{6}$ cps and detector acceptance of almost 4$\pi$ solid angle around a experimental target. HypTPC is designed to have a sensitive volume of $\phi$~500\,mm~$\times$ H~550\,mm and a inner target holder. Since beams are directly injected into the sensitive volume, we are able to reconstruct the primary vertex by measuring the beam trajectory in addition to the trajectories for produced particles. However, it is very challenging to operate a TPC with a exposure to the high-rate beam. Our solutions are electron amplification using Gas Electron Multipliers (GEMs) and a gating method of electric filed with wires to control electron drift. A specialized frontend electronics are also essential to handle about 6000 channels of HypTPC readout pads. We collaborate with the GET (General Electronics for TPC) project led by Saclay, GANIL, MSU, IRFU and CERNBG. The project provides us the total readout system including hardware and software. In this presentation, we will discuss physics interests of the J-PARC experiments. R\&D status of HypTPC with the GET system will also be reported.

### Primary author

Dr Hiroyuki Sako (Japan Atomic Energy Agency)

### Co-author

Dr Kenji Hosomi (Japan Atomic Energy Agency)

### Presentation materials

There are no materials yet.