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Motivation behind LYCCA at FAIR Diamond detector design Initial tests at Texas A&M University

Motivation behind LYCCA at FAIR Diamond detector design Initial tests at Texas A&M University Current work. Polycrystalline Diamond Detectors for Fast Timing Applications at FAIR Lianne Scruton, University of York. Motivation.

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Motivation behind LYCCA at FAIR Diamond detector design Initial tests at Texas A&M University

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  1. Motivation behind LYCCA at FAIR Diamond detector design Initial tests at Texas A&M University Current work Polycrystalline Diamond Detectors for Fast Timing Applications at FAIR Lianne Scruton, University of York

  2. Motivation • LYCCA : Lund-York-Cologne-Calorimeter shall be placed at the end of Super-FRS at FAIR as part of HISPEC campaign. • Based on CATE calorimeter used for RISING campaign, with the addition of time-of flight (TOF) measurements for better fragment identification. • Simulations by Mike Taylor show that TOF detectors require resolution of at least 100ps, ideally less than 50ps. 53Fe 52Fe 51Fe 50Fe LYCCA Wall Detectors Target Detectors Super-FRS

  3. The Design • Wafers of polycrystalline diamond purchased from Diamond Detectors Ltd measuring 20 x 20 mm, and 300µm thick. • Contacts fabricated at University of Surrey. Front contacts: divided into four strips for lower capacitance Back contacts: full pad for grounding purposes PCB: specially deigned for high frequency signals and impedance matched

  4. Texas A&M University • Detectors positioned in transmission geometry so that 500MeV and 800MeV of energy was deposited into front and back detectors respectively. High Frequency Cables 40 MeV/u Ar40 15mm Leading Edge Discriminator found to produce best results

  5. Results 95ps resolution per detector FWHM = 134ps FWHM = 104 ±

  6. Results Ne20 15mm Flight Path O16

  7. Results O16 30mm Flight Path Ne20

  8. Current Work Data taken at University of Birmingham, using scattered 50MeV 3He beam. 14.6 pF Rise time < 0.5 ns 8.11 pF 1.95 pF (ns)

  9. Thank You for Listening Collaborators: M.A.Bentley, B.S.NaraSingh and S.P.Fox University of York, UK F.Schirruand A.Lohstroh University of Surrey, UK L.Trache, A.Banuand rest of RET Group Cyclotron Institute, Texas A&M University M.Freer, D.Parkerand Cyclotron staffUniversity of Birmingham, UK Thanks to M.J.Taylor and D.Bloor for figures in slide 2

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