Polycrystalline Diamond Detectors for Fast Timing
Applications at FAIR Lianne Scruton, University of York
•Motivation behind LYCCA at FAIR
•Diamond detector design
•Initial tests at Texas A&M University
•Current work
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.
Motivation
50Fe
51Fe
52Fe53Fe
Super-FRS
LYCCA
Target Detectors
Wall Detectors
Wafers of polycrystalline diamond purchased from Diamond Detectors Ltd measuring 20 x 20 mm, and 300µm thick.
Contacts fabricated at University of Surrey.
The Design
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
Detectors positioned in transmission geometry so that 500MeV and 800MeV of energy was deposited into front and back detectors respectively.
Texas A&M University
High Frequency
Cables
15mm
40 MeV/u Ar40
Leading Edge Discriminator found
to produce best results
Results
FWHM = 104 ± FWHM = 134ps
95ps resolution per detector
Results
15mm Flight Path
O16
Ne20
Results
30mm Flight Path
O16
Ne20
Current Work
14.6 pF8.11 pF1.95 pF
Rise time < 0.5 ns
Data taken at University of Birmingham, using scattered 50MeV 3He beam.
(ns)
Thank You for Listening
Collaborators: M.A.Bentley, B.S.Nara Singh and S.P.FoxUniversity of York, UK
F.Schirru and A.LohstrohUniversity of Surrey, UK
L.Trache, A.Banu and rest of RET Group Cyclotron Institute, Texas A&M University
M.Freer, D.Parker and Cyclotron staffUniversity of Birmingham, UK
Thanks to M.J.Taylor and D.Bloor for figures in slide 2
