Speaker
Description
The tracking detector capable of recording the hit-time information in a precision of O(10ps) should become a breakthrough device in future hadron collider experiments to resolve signal tracks in the harsh environment with enormous background tracks. LGAD (low-gain avalanche detector) is one of such candidates, which is expected to provide fine spatial resolution at the same time; hence to realize a 4-D tracking detector. We have fabricated LGAD diodes and segmented strip-type detectors at Hamamatsu Photonics. The performance other than the timing resolution has been reported elsewhere [1]. Recently the pad type detectors were tested in a proton beam and we obtained a time resolution better than 30 ps for the devices with 50 m active thickness. The gain non uniformity across the strip [1] was modeled in a TCAD simulation, which was then used to design segmented LGAD sensors with uniform gain. The study suggests that uniform LGAD sensors can be made maintaining a wider operation bias voltage range. We report the test beam and the TCAD simulation results.
