OSU CLEO group -- A Project Overview

All Current Projects
These WEB pages are meant to describe the main projects the OSU CLEO group is involved. They primarily used for information exchange between us and other groups working at CLEO, but they also have an explanatory part, that can be useful for other physicist in HEP or related fields. But this can not be guaranteed!

Hardware CLEO III
The CLEO group is actively preparing the upgrade of the existing CLEO detector (Phase 2) to the high-luminosity era of CESR. This new and improved detector is called CLEO III.

OSU is involved in 2 major hardware groups and has also completed a gas study for the drift chamber system.

The increased event rate of CLEO III is forcing us to build a new Data Acquisition System (DAQ), that reads digital information distributed in numerous places at the detector area, transfers it to a central computing facility, supresses unwanted background and stores the data on magnetic tape. The part of the system that transfers the data from the ``front-end'' memory cells into the memory of the central CPU is managed and designed by the DAQ group, in which OSU is participating.
In the same group, the design of the trigger is discussed, since is snugly coupled to the data transfer system.
The whole system has to be managed and controlled, thefore the Slow Control group is also part of this effort.
One special part of the DAQ design effort is to integrate the FASTBUS standard smoothly into our system, containing embedded CPU's using the VME bus. A module plugged into the FASTBUS is providing up to 3 VME slots for controlling the bus with a commercially available CPU. We make FASTBUS look like VME...
CLEO III will use a Silicon Vertex Detector as innermost layer. The Sillicon III group is learning from the experiences with the newly installed SVD in CLEO II and in the process of designing the hardware around the silicon strips. We are especially involved in designing the front-end amplification chip, which has to be a very low-noise electronic design.
We concluded a study of various gases for the large drift chamber. It main purpose was to search for the best mixture of helium based gases and to characterize their performance.

Hardware CLEO II
We also work on the maintainance and improvement of the current CLEO detector.

To improve the efficiency of the VD detector, we are replacing the measurement electronics on one side of the detector with the new LeCroy TDC 1877. It has the capability of recording more than one signal per event per input channel, thus providing us with a better ``event history'' of signals in the innermost layers of the drift chamber system.

Hardware for Future Use
We also work on new detector elements and their use in future experiments:

Using the Cherenkov effect is a very powerful tool to do particle identification. We explore the usage of high resolution time measurements to see differences in the angle of the emitted light, causing different arrival times at the end of a quartz bar.
Silicon is vulnerable to radiation damage, so its use is limited to environments with low radiation dosages. The new era of high current hadron colliders poses a huge challenge to create a solid state strip detector installed close to the interaction point. We are persuing the option of a diamond detector, which has the needed radiation hardness, but needs special electronics to function as a strip detector.

Physics Analyses
All this work is done to understand the physics of heavy quarks and the Tau lepton by using a high statistics and high quality data sample. These pages outline the variouse analysis efforts, undertaken by members of the OSU CLEO group.

All Projects

DAQ
CLEO WEB PAGES
Updated: 3. January 1996
Author: Andreas H. Wolf (ahw@mps.ohio-state.edu)