June 12, 2013
Fermi National Accelerator Laboratory Batavia, IL 60510
US/Central timezone

Field-programmable gate array (FPGA) TDC module for Fermilab SeaQuest (E906) experiment

Not scheduled
Wilson Hall Atrium (Fermi National Accelerator Laboratory Batavia, IL 60510)

Wilson Hall Atrium

Fermi National Accelerator Laboratory Batavia, IL 60510

Speaker

Ms Su-Yin Wang (IPAS/Fermilab/NKNU)

Description

We develop a field-programmable gate array (FPGA) TDC module for Fermilab SeaQuest (E906) experiment. This 64-channel TDC is made of a 6U VMEbus unit equipping with a Microsemi ProASIC3 Flash based FPGA of low power and high radiation tolerance. The TDC firmware could digitize multiple hits of both polarities and possesses a multiple-hit elimination functionality which could be turned on to remove after-pulses in the wire chambers and proportional tubes. A scaler module is implemented to record the number of hits for each channel. The TDC resolution is determined by internal cell delays of 450 ps, and a measurement precision of 200 ps has been achieved. Furthermore we demonstrate the way of constructing the Wave Union TDC using the current multi-hit TDC with an external wave union launchers. Based on a four-edge wave union the measurement precision is improved by a factor of 2, 108 ps. Even more significant improvement of measurement precision up to 69 ps is achieved by combining the approaches of Wave Union TDC and multiple-channel ganging.

Primary author

Ms Su-Yin Wang (IPAS/Fermilab/NKNU)

Co-authors

Da-Shung Su (IPAS, Taiwan) David Christian (Fermilab) Hsi-Hung Yao (IPAS,Taiwan) Jin-Yuan Wu (Fermilab) Wen-Chen Chang (IPAS, Taiwan)

Presentation materials

There are no materials yet.