Date Thesis Awarded


Access Type

Honors Thesis -- Access Restricted On-Campus Only

Degree Name

Bachelors of Science (BS)




Todd Averett

Committee Members

Henry Krakauer

Junping Shi


The A1 n experiment at Jefferson Lab Hall A is designed to precisely measure the virtual photon asymmetry of neutrons in the Deep Inelastic Scattering (DIS) region using Hall A polarized 3He target and BigBite spectrometers. Even though both electrons and pions will be scattered, the BigBite spectrometer is designed to measure electrons only. Thus the Gas Ring Imaging Cherenkov (GRINCH) detector is vital, given its capacity to reject pions. The standard Fastbus Data Acquisition (DAQ) system used at Hall A lacks efficiency facing the increasing beam intensity. Thus it is impossible to generate directly a trigger for GRINCH that can be integrated into the BigBite trigger. Now a faster DAQ system is required. One proposal is the VXS-based Electron Trigger and Readout Card (VETROC), a FPGA-based digital board that contains not only a high-rate pipelining Time-to-Digital Converter (TDC), but also a programmable cluster-finding desired trigger. VETROC will be tested on a GRINCH prototype detector, a simplified version of GRINCH. This thesis is meant to prepare for VETROC tests by setting up a fully functional Fastbus DAQ system. This Fastbus DAQ, whose timing resolution ranges from 6 ns to 15 ns, is able to record Photomultiplier tube (PMT) firing patterns. A red LED is used to replace the Cherenkov light as the event source for the Fastbus tests.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.


A good work.

On-Campus Access Only