200103319
The D0 online monitoring and automatic DAQ recovery
The DZERO experiment, located at the Fermi National Accelerator Laboratory, has recently started the Run 2 physics program. The detector upgrade included a new Data Acquisition/Level 3 Trigger system. Part of the design for the DAQ/Trigger system was a new monitoring infrastructure. The monitoring was designed to satisfy real-time requirements with 1-second resolution as well as nonreal-time data. It was also designed to handle a large number of displays without putting undue load on the sources of monitoring information. The resulting protocol is based on XML, is easily extensible, and has spawned a large number of displays, clients, and other applications. It is also one of the few sources of detector performance available outside the Online System's security wall. A tool, based on this system, which provides for auto-recovery of DAQ errors, has been designed. This talk will include a description of the DZERO DAQ/Online monitor server, based on the ACE framework, the protocol, the auto-recovery tool, and several of the unique displays which include an ORACLE-based archiver and numerous GUIs.
66988424
Simultaneous tracking and vertexing with elastic templates
The Elastic Templates algorithm uses simulated mean-field annealing to find near-optimal solutions of problems that are both combinatorial and continuous. In high-energy physics experiments it has been applied to the tracking problem, which is to minimize the distances between track templates and the hits belonging on each track. I will explain recent attempts to extend and improve this approach for reconstructing data from the DO/ experiment. Vertex templates have been added, and the algorithm simultaneously minimizes the distances between the track templates and the vertex assigned to each track. A final step aimed at finding secondary vertices in jets is also explored.
121210028
Field measurements in the Fermilab electron cooling solenoid prototype
To increase the Tevatron luminosity, Fermilab is developing a high-energy electron cooling system [1] to cool 8.9-GeV/c antiprotons in the Recycler ring. The schematic layout of the Recycler Electron Cooling (REC) system is shown in Figure 1. Cooling of antiprotons requires a round electron beam with a small angular spread propagating through a cooling section with a kinetic energy of 4.3 MeV. To confine the electron beam tightly and to keep its transverse angles below 10{sup -4} rad, the cooling section will be immersed into a solenoidal field of 50-150G. As part of the RD also, this chapter shows the results of our first attempts of implementing the algorithm.