A new VME based high voltage power supply has been developed for the D0 exoeriment at Fermilab. There are three types of supplies delivehng up to +5.6 kV at 1.0 mA or +2.O kV at 3.0 mA with a set accuracy of 1.5 V and extremely low voltage ripples. Complete computer control has allowed many special features to be developed for the supply. iaciuding userdefined control and monitor groups, variable ramp rates, and advanced histogram and graphic functions.
A queuing theory model was wed in the initial design of the DO data acquisition system. It was mainly used for the front end electronic systems. Since then the model has been extmied to include the entire data path for the tracking system. The hacking system generates the most data so we expect this system to determine the overall transfer rate. The model was developed using both analyticaI and simulation methods for solving a series of single server queues. We describe the model and the methods used to develop it. We also present results from the original models, updated calculations representing the system as built and comparisons with measurements made with the hardware. in place for the cosmic ray test l-0".
We have developed microsecond timing and profiling software that runs on standard Windows [1] and Linux based operating systems. This software is orders of magnitudes better than most of the standard native functions in wide use.Our software libraries calibrate RDTSC in microseconds or seconds to provide two different types of delays: a "Guaranteed Minimum" and a precision "Long Delay", which releases to the kernel. Both return profiling information of the actual delay.
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