Proton irradiation of CVD diamond detectors for high-luminosity experiments at the LHC

Abstract

CVD diamond shows promising properties for use as a position sensitive detector for experiments in the highest radiation areas at the Large Hadron Collider. In order to study the radiation hardness of diamond we exposed CVD diamond detector samples to 24 GeV/c and 500 MeV protons up to a uence of 510 15 p=cm 2 . We measured the charge collection distance, the average distance electron hole pairs move apart in an external electric eld, and leakage currents before, during, and after irradiation. The charge collection distance remains unchanged up to 1 10 15 p=cm 2 and decreases by 40 % at 5 10 15 p=cm 2 . Leakage currents of diamond samples were below 1 pA before and after irradiation. The particle induced currents during irradiation correlate well with the proton ux. In contrast to diamond, a silicon diode, which was irradiated for comparison, shows the known large increase in leakage current. We conclude that CVD diamond detectors are radiation hard to 24 GeV/c and 500 MeV protons up to at least 1 10 15 p=cm 2 without signal loss.presented at The 2 nd Int.

Pulse height distribution and radiation tolerance of CVD diamond detectors

“…The proton irradiation was performend at CERN in the PS beam using 24 GeV/c protons [3,4]. The neutron irradiations were performed at the Atomki cyclotron in Debrecen, Hungary, the pion irradiations at PSI using 300 MeV/c pions [5].…”

The13C(n,α0)10Be cross section at 14.3 MeV and 17 MeV neutron energy

“…The energy spectrum of the produced neutrons depends on the target type, the incident charged particle energy and the angle of the emitted neutron with respect to the incident a e-mail: pavel.kavrigin@cividec.at charged particle beam. For the 13 C(n,α 0 ) 10 Be cross section measurements a 2 MeV deuteron beam impinging on a T/Ti target was used to produce neutrons via the T(d,n) 4 He reaction. The titanium layer of the target has 2157 µg/cm 2 areal density.…”

“…Diamond detectors based on CVD diamond can be efficiently used as neutron monitors due to the combination of such properties as: subnanosecond time response [1,2], high irradiation resistance [3,4], the possibility of discrimination of different particle interaction types [5,6]. The detection of fast neutrons with diamond detectors is achievable due to the nuclear reactions of neutrons with carbon nuclei [7].…”

Performance of irradiated CVD diamond micro-strip sensors

“…The irradiations were performed using 24 GeV/c protons from the Proton Synchrotron (PS) at CERN where details of the irradiation can be found in reference [10]. The absorbed dose can be derived from the proton fluence.…”