Pixel hybrid photon detector magnetic distortions characterization and compensation

Abstract

• b physics at the LHC p-p collider: CP violation, rare decays • Single arm forward spectrometer (W.Witzeling, IEEE NSS N21-8) • Hadrons identification-> Ring Imaging Cherenkov detectors RICH RICH 1 RICH 2 p-p interaction point Magnet 300 mrad 250 mrad 20 m

The magnetic distortion calibration system of the LHCb RICH1 detector

“…11. These shapes are parameterized by simple polynomial functions [7,8], and then combined with a coefficient of magnification to arrive at the full transformation, Eq. 1.…”

“…HPDs are well known to be sensitive to external magnetic fields [7,8,9]. In particular, they are efficient only below 1.5 mT axial fields, and less so if the field is off-axis.…”

“…Microchip microcontroller PIC 18F6622, with high current source/sink 6. Serial Peripheral Interface (SPI) bus is a de facto standard for device communication and control in master/slave mode, via synchronous serial data link 7. International Rectifier IRLML2803 HEXFET Power MOSFET.…”