Drift monitor development

To keep track of the gas quality and, consequently, the drift properties in the FTPCs, the gas flushed out of the chambers is run through drift monitors. They measure the drift time of electrons created from the ionization of alpha particles from sources at two different drift distances. Given the known distance of the sources and the voltage, the difference in the drift time allows a calibration of the drift velocity.

Assembled Driftmonitor GOOFIE  (NEW VERSION)

Some pictures of the new design, the field cage and the tube for the fieldcage with the cooling pipes.

The read out electronic will make use of the ALEPH pad preamplifiers and shapers (preamplifier schematic, shaper schematic and pinout) developed at MPI. The signals will be collected from the tube to maximize the signal to noise ratio.

The acquisition of the data will be performed by a PC running Labview. With this device we plan to achieve a drift velocity resolution of the order of 0.1%.

The data acquisition

The acquisition of the data for the drift monitor system is performed by a PC (bond.starp in BNL) running Labview. The signals are read out by an ADC card installed in the

PC (PCI9812 from Adlink Technology).

You can find the package with necessary files for operating the card, documentation and drivers  on CD or in BNL on D:\users\gaspare\drift monitor\labview on bond.

Follow the links to get more information:


This Page was updated by Tobias Titz.
Last modified: Fri June 29 16:05:19 CET 2001