The Upgrade And Optimization Of VME Control/Fanout Module In BESIII Muon Electronics

The Beijing Electron Positron Collider (BEPC) was built in 1989 and its research field covers Tau physics and the precise research of standard model. BEPC consists of the injector, the storage ring, the transportation line, the Beijing Spectrometer (BES), the Beijing Synchrotron Radiation Facility (BSRF), etc. It is a very important experiment equipment for China to do research in particle physics.After the upgrade of BEPC, BEPCII is a high luminosity, multi-bunch collider with the peak luminosity of 1033cm-2s-1 and BESIII is much more powerful than BESII in the performance. It is important for the particle physics to get high quality events with the large statistics in a short time in order to test the Standard Model with a very high precision.BESIII Muon electronic system includes VME subsystem and FEC (Front-End Circuit) subsystem. The VME subsystem, which was placed outside the detector, consists of one VME controller, one VME control/fanout module and ten VME readout modules. There are 572 Front-End Circuits in the FEC subsystem which is inside of the detector. The FEC converts analog signals into digital signals, chooses the parallel data according to the trigger signals, and transmits the data in serial format.As an important part of BESIII Muon electronic system development, the design and upgrade of VME control/fanout module is discussed in detail in this thesis.The function of BESIII Muon electronic system VME control/fanout module is to receive fast control signals from optical sub-circuit and send these signals to VME ReadOut and FEC; FANOUT also receive FULL, ERROR and some other status signals from ReadOut and FEC and sends these status signals to Trigger system via optical sub-circuit. FANOUT will generate trigger, CHK and other control signals to make VME electronic system work in self-test mode.First, the physical background of BESIII and the design objective of BESIII electronic system are explained in this thesis. Next, the organization of VME bus and several bus cycles are introduced because the whole Muon electronic system is based on VME bus.One experiment is carried out to research two clocks'impact on FPGA firmware, who is independent and whose clock frequency is very close to each other.Based on this experiment, the design, upgrade and optimization in circuit hardware and FPGA firmware of FANOUT are discussed. Long time test is also carried out.