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Results with a CVD diamond at the K2K beam-line

Results with a CVD diamond at the K2K beam-line. RD42 collaboration meeting May 14 th 2004. Contents 1.Introduction 2.Set up 3.Results 4.Summary. Jun Kubota(Kyoto Univ.). Japan. Member. Kyoto Univ. J.Kubota, K.Nishikawa, T.Nakaya, M.Yokoyama. KEK. J.Kameda(now, ICRR). Canada.

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Results with a CVD diamond at the K2K beam-line

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  1. Results with a CVD diamond at the K2K beam-line RD42 collaboration meeting May 14th 2004 Contents 1.Introduction 2.Set up 3.Results 4.Summary Jun Kubota(Kyoto Univ.) RD42 collaboration meeting

  2. Japan Member Kyoto Univ. J.Kubota, K.Nishikawa, T.Nakaya, M.Yokoyama KEK J.Kameda(now, ICRR) Canada TRIUMF P.Kitching, A.Konaka Toronto Univ. J.F.Martin, W.Trischuk(RD42) RD42 collaboration meeting

  3. ~1GeV n beam Super-K: 22.5 kt J-PARC 50GeV PS 1.Introduction1.1 J-PARC neutrino oscillation experiment(T2K) Plan to start in 2009 • Discovery of • oscillation • Precision measurement of • oscillation parameter RD42 collaboration meeting

  4. proton Target In a long baseline neutrino oscillation experiment, it’s necessary to monitor thedirection, the profile and the intensity of the neutrino beam. 1.2 motivation The neutrino beam can be monitored on spill-by-spill basis by measuring the secondary muons coming from pion decay A muon monitor is needed (In K2K, silicon pad detectors and ion chamber are used as muon monitors) RD42 collaboration meeting

  5. 1.2 motivation(cont.) In T2K long baseline neutrino oscillation experiment, the muon beam intensity is expected to be 1000 times more than K2K In K2K, about In T2K, about Radiation hardness for silicon detectors will become a problem • Test whether a diamond detector is useful as a muon monitor - A diamond detector is installed to K2K muon monitor RD42 collaboration meeting

  6. 1.3 diamond detector • Developed by RD42 • 2 diamonds bought from Ohio State • Univ. • One packaged at Toronto, sent to KEK • Second one still at Toronto • Characteristic • Size 0.95cm 0.95cm • Thickness 500 Capacitance 9.1pF(as capacitor) RD42 collaboration meeting

  7. K2K muon monitor K2K neutrino beam line Beam dump Target 200 m 3.5m silicon detectors ion chamber p 12GeV PS 2 Set up2.1 The position of the diamond detector • Muon intensity @ beam center ; ~ • Beam has 9 bunches for 1.1 , every 2.2sec RD42 collaboration meeting

  8. Beam center 35cm 2.1 The position of the diamond detector(cont.) Inside of K2K muon monitor We install the diamond detector around the beam center diamond detector silicon detectors ion chamber silicon detectors • The signal from the silicon detector is used as a reference • We don’t know the absolute muon flux RD42 collaboration meeting

  9. 2.2 Circuit Diamond detector 9.1pF about 20m w/o Amp HV supply read out 50 resistance capacitor 2200pF (to keep bias voltage) • Time constant…about 0.46nsec • Operate at the bias voltage of 650V RD42 collaboration meeting

  10. overshoot 2.3 Raw signal from the diamond detector Beam spill has 9bunches for 1.1 3mV 1.1micro-sec 9 bunches are clearly observed, but, signal also has overshoot RD42 collaboration meeting

  11. Measured item 3.Results • The relation of the collected charge v.s the electric field • The charge collection distance • Physical value defined by RD42 RD42 collaboration meeting

  12. 1.0V/ m 3.1 The relation of the collected charge v.s the electric field Above 1.0V/ diamond/silicon 0.07 almost flat 0.06 0.05 0.04 consistent 0.03 0.02 0.01 In RD42 measurement (NIM.A514(2003)79), reach plateau 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Electric field(V/ m) m RD42 collaboration meeting

  13. pedestal signal Beam center @ m(650V) Measurement of the collected charge 3.2 The charge collection distance • silicon detector • 160pC(656.1ADC count) • average of two silicon detectors 13.8pC(56.69ADC count) measured ratio(diamond/silicon)13.8pC/160pC… 8.6% RD42 collaboration meeting

  14. Ratio(diamond/silicon) 3.2 The charge collection distance(cont.) The charge collection distance( ) Generated charge for a mip Size Thickness of depletion layer Assumption… the collection efficiency;100% measured ratio The charge collection distance 116.5 • Possibly underestimate (>20%) due to overshoot(shown by signal photograph) RD42 collaboration meeting

  15. Summary • With a diamond detector, the signal of muon flux ( ) was observed at K2K muon monitor • The relation of the collected charge v.s the electric field • above 1.0V/ , almost flat • The charge collection distance • 116.5 …possibly underestimate (>20%) due to overshoot (shown by signal photograph) -agree with the expectation(typical collection distance should be around 120 ) In T2K, we can conclude a diamond detector is useful as a muon monitor RD42 collaboration meeting

  16. Supplement RD42 collaboration meeting

  17. Beam center Measured charge of the silicon detector 169pC(693.2ADC count) Silicon detector Size… 1cm ×2cm depletion layer… 300micro-meter 151pC(618.9ADC count) 160pC @diamond detector RD42 collaboration meeting

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