1. IE browser is NOT supported anymore. Please use Chrome, Firefox or Edge instead.
2. If you are a new user, please register to get an IHEP SSO account through https://login.ihep.ac.cn/registlight.jsp Any questions, please email us at helpdesk@ihep.ac.cn or call 88236855.
3. If you need to create a conference in the "Conferences, Workshops and Events" zone, please email us at helpdesk@ihep.ac.cn.
4. The max file size allowed for upload is 100 Mb.
Belle II vertex detector commissioning and CO2 cooling system
by
DrHua Ye
(DESY)
→
Asia/Shanghai
A511
A511
Description
Abstract:
As an upgrade of asymmetric e+e- collider KEKB, SuperKEKB aims to increase the peaking luminosity by a factor of 40 to 8X10^{35}cm^{-2}s^{-1}. The SuperKEKB commissioning is achieved in 3 phases. The Phase 1 was successfully finished in June.2016. In April.2017 the partial Belle II detector has been rolled in and the final focusing magnets have been installed. Now the commissioning is working towards the Phase 2 targeting to start collision and reach the luminosity of 1X10^{34}cm^{-2}s^{-1}. In Phase 2, the beam induced background versus luminosity and beam current will be investigated, to ensure a radiation safe operation environment for the Belle II vertex detector (VXD) during the Physics data taking in Phase 3. The Belle II VXD is indispensable for the accurate determination of the decay points of B or D mesons as well as track reconstruction of low momentum particles. Two layers of silicon pixels, based on the DEPFET technology, will be added to complement the four layers of double sided silicon strips for a better vertex resolution. The DEPFET sensors are thinned down to 75μm with low power consumption and low intrinsic noise. To guarantee the acceptable operation conditions for VXD, the cooling system must be capable of removing a total heat load of about 1 kW from the very confined VXD volume. Evaporative two-phase CO2 cooling concept has been chosen for the VXD cooling. I will give an overview of the status of Belle II vertex detector commissioning mainly for Phase 2 and the investigation of the CO2 cooling performance.
Speaker: Dr. Hua Ye (DESY)
About the speaker:
2005-2009 Bachelor of physics, department of modern physics, USTC, Hefei.
2009-2014 PhD of experimental particle physics. Physics analyses of baryon spectroscopy, and charmonium decays.
2012.11-2014.2 with the support of DAAD scholarship, Giessen university, GPU based online tracking.
2014-2016, visiting postdoc at DESY, working on the CO2 cooling and the thermal mockup studies of the Belle2 vertex detector.
2016-, DESY postdoc fellowship, working on the integration and characterisation of Belle2 pixel detector.
