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채종서,미트라게게르치,한인식,S. Y. Han,I. W. Jeong,주관식,김은주,김용균,E. Kistenev,권영일,J. G. Lajoie,Z. Li,J.H.Lee,K. S. Lim,J. M. Park,K. S. Park,H. S. Song,D. G. Sue,A. Sukhanov 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.1
The Si Mini-Pad sensor is an essential component of the MPC-EX preshower detector. Thisdetector will be integrated into the PHENIX experiment at Brookhaven National Laboratory’s RelativisticHeavy Ion Collider. We describe the development of the surface pattern and the fabricationprocess of the Si Mini-Pad sensor and present a test by the low energyirradiation that is sensitiveto the surface design.
Effects of Damage Caused by Non-ionizing Energy Loss in Si Mini-Pad Sensors for the PHENIX MPC-EX
채종서,미트라게게르치,한인식,S. Y. Han,I. W. Jeong,주관식,김은주,S. G. Kim,김용균,E. Kistenev,권영일,J. G. Lajoie,Z. Li,J. H. Lee,K. S. Lim,S. H. Lim,J. M. Park,K. S. Park,S. Y. Park,H. S. Song,D. G. Sue,A. Sukhanov 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.11
The PHENIX MPC-EX is an W/Si pre-shower detector operating at small angles with respectto the beam in the Relativistic Heavy Ion Collider (RHIC). The Si Mini-Pad sensors are the activeelement of the detector. The expected hadron flux to the Si Mini-Pad sensors will generate significantnon-ionizing energy loss in the sensors, which may damage the crystalline structure of thesensor’s bulk material. We investigated the nature of the hadron flux to the Si Mini-Pad sensorsthrough a full simulation and determined its effect on the sensor’s characteristics based on a beamtest. The investigation showed key issues in designing a preshower detector using silicon sensorsand operating under a large neutron fluence and offered valuable information on the operation ofthe MPC-EX detector.
Development of magnetic field measurement system for AMS cyclotron
남궁호,최효정,미트라게게르치,하동협,Mustafa Mumyapan,채종서,이종철,송호승 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.8
A high-accuracy magnetic field measurement device based on a cyclotron is being developed for accelerator mass spectrometry (AMS). In this study, a magnetic field measurement device consisting of a Hall probe sensor, piezo-motor, and step motor was developed to measure the magnetic field of the AMS cyclotron magnet. The Hall probe sensor was calibrated to achieve positional accuracy by using polar coordinates. The measurement results between the ratchet gear and piezo-motor, which are the instruments used for driving the measurement device, were analyzed. The measurement result of the device with a piezo-motor exhibits a difference of 5 Gauss (0.04%) as compared with the simulation result.
Real-time 14N NQR-based sodium nitrite analysis in a noisy field
Sharifi Mohammad Saleh,송호승,Afarideh Hossein,미트라게게르치,Simiari Mehdi 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.12
Noise and Radio-frequency interference or RFI causes a significant restriction on the Free induction Decay or FID signal detection of the Nuclear Quadrupole Resonance procedure. Therefore, using this method in non-isolated environments such as industry and ports requires extraordinary measures. For this purpose, noise reduction algorithms and increasing signal-to-noise-and-interference ratio or SNIR have been used. In this research, sodium nitrite has been used as a sample and algorithms have been tested in a non-isolated environment. The resonant frequencies for the 150 g of test sample were measured at 303 K at about 1 MHz and 3.4 MHz. The main novelty in this study was, (1) using two types of antennas in the receiver to improve adaptive noise and interference cancellation, (2) using a separate helical antenna in the transmitter to eliminate the duplexer, (3) estimating the noise before sending the pulse to calculate the weighting factors and reduce the noise by adaptive noise cancellation, (3) reject the interference by blanking algorithm, (4) pulse integration in the frequency domain to increase the SNR, and (5) increasing the detection speed by new pulse integration technique. By interference rejection and noise cancellation, the SNIR is improved to 9.24 dB at 1 MHz and to 7.28 dB at 3.4 MHz, and by pulse integration 44.8 dB FID signal amplification is achieved, and the FID signals are detected at 1.057 MHz and 3.402 MHz at room temperature