Recent Results from Beam Tests of 3D and Pad pCVD Diamond Detectors

Abstract

Results from prototypes of a detector using chemical vapor deposited (CVD) diamond with embedded resistive electrodes in the bulk forming a 3D diamond device are presented. A detector system consisting of 3D devices based on poly-crystalline CVD (pCVD) diamond was connected to a multi-channel readout and successfully tested in a 120 GeV/c proton beam at CERN proving for the first time the feasibility of the 3D detector concept in pCVD for particle tracking applications. We also present beam test results on the dependence of signal size on incident particle rate in charged particle detectors based on poly-crystalline CVD diamond. The detectors were tested in a 260 MeV/c pion beam over a range of particle fluxes from 2 kHz/cm 2 to 10 MHz/cm 2 . The pulse height of the sensors was measured with pad readout electronics at a peaking time of 7 ns. Our data from the 2015 beam tests at PSI indicate that the pulse height of poly-crystalline CVD diamond sensor irradiated to 5 × 10 14 n eq /cm 2 is independent of particle flux at 3% level.

Diamond detector for beam profile monitoring in COMET experiment at J-PARC

“…Recent tests on the CMS PLT [14] indicate a dependence of the signal magnitude on the rate of particle flux in highly irradiated single crystal diamond. This trend does not adversely impact the objectives of the proton beam monitor for COMET, which will likely have a coarse pixellization.…”

Recent Results from Polycrystalline CVD Diamond Detectors

“…Another essential characteristic of position sensitive detectors for future high energy experiments is their capability to operate at high particle rates, up to O GHz/cm 2 . Previously, the RD42 collaboration has conducted a series of beam tests to characterize the pulse height dependence in diamond detectors on particle flux [10,11]. No dependence of the signal response of polycrystalline CVD (pCVD) diamond pad detectors, which were irradiated up to a neutron fluence of 5 × 10 14 n/cm 2 , on the particle flux up to 10 MHz/cm 2 was observed [11].…”

“…Previously, the RD42 collaboration has conducted a series of beam tests to characterize the pulse height dependence in diamond detectors on particle flux [10,11]. No dependence of the signal response of polycrystalline CVD (pCVD) diamond pad detectors, which were irradiated up to a neutron fluence of 5 × 10 14 n/cm 2 , on the particle flux up to 10 MHz/cm 2 was observed [11]. This study was extended and pCVD diamond samples were irradiated up to a larger neutron fluence [12].…”