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Development of a Vertex Chamber with using GEM

Workshop for MPGD at Kyoto University, 2004.Dec.3-4. Development of a Vertex Chamber with using GEM. Yutaka Mizoi Osaka Electro-Communication University. Colleagues; Tomokazu Fukuda, Shizu Minami, and Wataru Imoto. Contents 1) Experiments 2) Cylindrical Drift Chamber System

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Development of a Vertex Chamber with using GEM

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  1. Workshop for MPGD at Kyoto University, 2004.Dec.3-4. Development of a Vertex Chamber with using GEM Yutaka Mizoi Osaka Electro-Communication University Colleagues; Tomokazu Fukuda, Shizu Minami, and Wataru Imoto

  2. Contents 1) Experiments 2) Cylindrical Drift Chamber System 3) Design of Vertex Chamber 4) Schedule and etc. 5) Other Cylindrical GEM Detectors

  3. 1) Experiments I) Study of Double-L Hypernuclei @ J-PARC a) Confirm the existence of 4H b) Search for 5H II) p + n p + L @ RCNP LL High vertex resolution is required for tracing two-p tracks. p + p- High counting rate from background.

  4. Vertex Chamber Hodoscopes Cylindrical Drift Chamber Solenoid Magnet p- k- k+ p- 2) Cylindrical Drift Chamber System (CDS) Vertex Determination Momentum Analysis Particle Identification

  5. 3) Design of Vertex Chamber Development History E906@BNL in 1998: Previous CDS designed by J. P. Nakano, et al. for LL experiments. No Vertex Chamber, Z-Chamber outer of CDC did not be used due to... E961@BNL accepted in 2002: A newly developed vertex chamber will be installed in the previous CDS, but ....... Recently, design study of a new CDS has been started for J-PARC.

  6. Hotchi Results of GEANT simulations * The upper 4 elements of FP were excluded from trigger in E906.

  7. Hotchi w/ vertex chamber w/o vertex chamber X decays DCA<2cm DCA<0.8cm Double L signals Distance of Closest Approach (cm)

  8. New z-vertex chamber Required dimension : ~f100 mm x 315 mm

  9. Two Promising Designs - Anode wire or GEM ? (Inner or Outer is another option.) Z Strip Read-out Strip Electrode R GEM p- Anode Wire GEM foil x 2~3 Field Wire Anode-wire configuration; Well known structure, One-dimensional tracking, Wire-tension stress... GEM-foil configuration; Two-dimensional tracking, No mechanical Stress, High counting rate, Unknown structure, Mass density...... p- Anode Strip Z position

  10. Design of the Read-out Strip-Electrode Sheet Polyimide 25mm+Cu 18mm X 3 layers, 3mmX129.3mm Strip with 0.2mm gap X 96 strips

  11. Required Design for GEM i) Gas gain ? 103~4 ~ achievable with single GEM foil. ii) Multi GEM ? for safety margin; two or three GEMs, but thickness is another problem. iii) Size ? 30cm X 15cm ~ available in CERN workshop.

  12. 4) Development Schedule 1) Anode-wire configuration Test in a planer geometry will start soon. A test bench with anode wires will be ready at KEK in December. Thanks for Sekimoto-san. 2) GEM-foil configuration Three 10cm2-GEM foils made in CERN have just arrived. A test bench in a planer geometry is now under designing. Prof. Sauli gave us a large-area (junk) GEM foil with 31cmX31cm. A mechanical test for forming a GEM foil into cylindrical shape will be performed in this FY.

  13. http://www.jlab.org/~hcf/bonus/ 5) Other Cylindrical GEM Detectors I) BoNuS Detector@Jefferson Lab. Howard Fenker, et al. BoNuS=Barely off shell Nuclear Structure Radial TPC 20cm x 8-12cmf

  14. http://tactic.triumf.ca/ II) TACTIC@TRIUMF, Pierre-André Amaudruz, et al. TACTIC=TRIUMF Annular Chamber for Tracking Identification of Charged particles Nuclear-Astrophysical Reactions

  15. Summary Which is better for the present purpose, GEM or Anode-wire configuration? We will continue study to resolve it. Anyway, we will develop a cylindrical GEM detector. It is a very attractive challenge itself. A CDC will be replaced by a cylindrical GEM TPC !?

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