Author: Li, H.
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WEPGF090 Design of EPICS IOC Based on RAIN1000Z1 ZYNQ Module 905
 
  • T. Xue, G.H. Gong, H. Li, J.M. Li
    Tsinghua University, Beijing, People's Republic of China
  
  ZYNQ is the new ar­chi­tec­ture of FPGA with dual high per­for­mance ARM Cor­tex-A9 proces­sors from Xil­inx. A new mod­ule with Giga Bit Eth­er­net in­ter­face based on the ZYNQ XC7Z010 is de­vel­op­ment for the High Pu­rity Ger­ma­nium De­tec­tors' data ac­qui­si­tion in the CJPL (China Jing­Ping un­der-ground Lab) ex­per­i­ment, which is named as RAIN1000Z1. Base on the nice RAIN1000Z1 hard­ware plat­form, EPICS is port­ing on the ARM Cor­tex-A9 proces­sor with em­bed­ded Linux and an Input Out­put Con­troller is im­ple­mented on the RAIN1000Z1 mod­ule. Due to the com­bi­na­tion of proces­sor and logic and new sil­i­con tech­nol­ogy of ZYNQ, em­bed­ded Linux with TCP/IP sock­ets and real time high through­put logic based on VHDL are run­ning in a sin­gle chip with small mod­ule hard­ware size, lower power and higher per­for­mance. This paper will in­tro­duce how to port­ing the EPICS IOC ap­pli­ca­tion on the ZYNQ based on em­bed­ded Linux and give a demo of IO con­trol and RS232 com­mu­ni­ca­tion.  
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WEPGF126 Prototype of White Rabbit Network in LHAASO 999
 
  • H. Li, G.H. Gong
    Tsinghua University, Beijing, People's Republic of China
  • Q. Du
    LBNL, Berkeley, California, USA
  
  Funding: Key Laboratory of Particle & Radiation Imaging, Open Research Foundation of State Key Lab of Digital Manufacturing Equipment & Technology in Huazhong Univ. of Science & Technology
Syn­chro­niza­tion is a cru­cial con­cern in dis­trib­uted mea­sure­ment and con­trol sys­tems. White Rab­bit pro­vides sub-nanosec­ond ac­cu­racy and pi­cosec­onds pre­ci­sion for large dis­trib­uted sys­tems. In the Large High Al­ti­tude Air Shower Ob­ser­va­tory pro­ject, to guar­an­tee the an­gu­lar res­o­lu­tion of re­con­structed air shower event, a 500 ps over­all syn­chro­niza­tion pre­ci­sion must be achieved among thou­sands of de­tec­tors. A small pro­to­type built at Yang­ba­jin, Tibet, China has been work­ing well for a whole year. A portable cal­i­bra­tion node di­rectly synced with the grand­mas­ter switch and a sim­ple de­tec­tors stack named Tele­scope are used to ver­ify the over­all syn­chro­niza­tion pre­ci­sion of the whole pro­to­type. The pre­lim­i­nary ex­per­i­ment re­sults show that the long term syn­chro­niza­tion of the White-Rab­bit net­work is promis­ing and 500 ps over­all syn­chro­niza­tion pre­ci­sion is achiev­able with node by node cal­i­bra­tion and tem­per­a­ture cor­rec­tion. 		 
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THHB2O03 The Global Trigger with Online Vertex Fitting for Low Energy Neutrino Research 1107
 
  • G.H. Gong, H. Li, T. Xue
    Tsinghua University, Beijing, People's Republic of China
  • H. Gong
    TUB, Beijing, People's Republic of China
  
  Neu­trino re­search is of great im­por­tance for par­ti­cle physics, as­tro­physics and cos­mol­ogy, the JUNO (Jiang­men Un­der­ground Neu­trino Ob­ser­va­tory) is a multi-pur­pose neu­trino ex­per­i­ment for neu­trino mass or­der­ing de­ter­mi­na­tion and pre­ci­sion mea­sure­ment of neu­trino mix­ing pa­ra­me­ters. A brand new global trig­ger scheme with on­line ver­tex fit­ting has been pro­posed, aim­ing at the ul­tra-low anti-neu­trino en­ergy thresh­old as down to 0.1MeV which is es­sen­tial for the study of solar neu­trino and elas­tic scat­ter­ing of neu­tri­nos on su­per­nova burst. With this scheme, the TOF (time of flight) dif­fer­ence of pho­tons fly through the liq­uid media from the in­ter­ac­tion point to the sur­face of cen­tral de­tec­tor can be cor­rected on­line with real time, the width of trig­ger win­dow to cover the whole pe­riod of a spe­cific neu­trino gen­er­ated pho­tons can be sig­nif­i­cantly re­duced which lessen the in­te­grated dark noise in­tro­duced from the large amount of PMT de­vices hence a lower en­ergy thresh­old can be achieved. The scheme is com­pat­i­ble, flex­i­ble and easy to im­ple­ment, it can ef­fec­tively ex­tend the physics po­ten­tial of the JUNO for low en­ergy neu­trino re­search top­ics.  
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