STAR TOF Readout Electronics and DAQ

1. STAR TOF Readout Electronics and DAQ Joachim Schambach University of Texas at Austin For the STAR TOF Collaboration

2. P. Fachini, Zhangbu Xu Brookhaven National Laboratory Feng Liu, Lianshou Liu, Zhixu Liu, Jinghua Fu, Yuan Hu, Zhiming Li, Yuanfang Wu, Yan Lu HuaZhong Normal University, Wuhan, China Jin Li, Junguang Lu, Bingyun Zhang Institute of High Energy Physics (IHEP), Beijing, China Wenlong Zhan, Zhiyu Sun Institute of Modern Physics (IMP), LanZhou, China D. Hardtke, F. Retiere, N. Xu Lawrence Berkeley National Laboratory, Berkeley, CA L. Kotchenda Moscow Engineering Physics Institute, Moscow, Russia J.W. Mitchell NASA - Goddard Space Flight Center, Greenbelt, MD G. Paic, E. Cuautle, A. Martinez, G. Calderon UNAM & CINVESTAV, Mexico City, Mexico B. Bonner, G. Eppley, F. Geurts, W.J. Llope, T. Nussbaum, J. Roberts Rice University, Houston, TX Wenging Shen, Yugang Ma, Xiangzhou Cai Shanghai Institute of Nuclear Research (SINR), Shanghai, China Kejun Kang, Jianping Cheng, Yuanjing Li, Yulan Li, Yi Wang Tsinghua University, Beijing, China C. Whitten, H. Huang, G. Igo, V. Ghazikhanian, S. Trentalange, A. Tai, H. Long University of California - Los Angeles, Los Angeles, CA Hongfang Chen, Xin Dong, Xiaolian Wang, Ziping Zhang, Cheng Li, Lijuan Ruan, Shuwei Ye, Jian Wu, Ming Shao, Shengli Huang University of Science and Technology of China (USTC), Hefei, China G. Hoffmann, A. Ishihara, C.F. Moore, L. Ray, J. Schambach, H. Ward University of Texas, Austin, TX T. Trainor University of Washington, Seattle, WA C. Markert Yale University, New Haven, CT The STAR TOF Collaboration J. Schambach, UT Austin

3. RHIC at BNL J. Schambach, UT Austin

4. Pad Geometry Gas: 90%C2H2F4 5% Iso-Butane 5% SF6 Multi-Gap Resistive Plate Chamber • Developed in collaboration with the ALICE TOF group • CERN experiment HARP has been using it for 2 years • Tested at CERN in 2000/01 and at AGS in 2002 • Prototype tray with 192 channels in current STAR run • Timing-resolution < 100ps, efficiency > 95% • Measure large & small scale correlations • Increase statistics for multi-strange baryon measurements • Extend the Pt range of ID’d particles in STAR J. Schambach, UT Austin

5. TOF Tray Design J. Schambach, UT Austin

6. Electronics Overview J. Schambach, UT Austin

7. On Detector Electronics CERN HPTDC ASIC Maxim 3760 AD96687 J. Schambach, UT Austin

8. Off Detector Interface Electronics J. Schambach, UT Austin

9. DAQ Receiver J. Schambach, UT Austin

10. TDIG & TFEE Prototypes TFEE TDIG J. Schambach, UT Austin

11. TDIG Prototype: “Jalapeno”(SBIR with Lloyd Bridges, Blue Sky Electronics) • Microchip PIC18F8720 (with CANbus & Serial port) • Altera APEX 20K family PLD • 2 HPTDC’s, independent or chained • JTAG interface • Analog meant for comparison of slewing correction, section not (yet) implemented (final version will use time-over-threshold) J. Schambach, UT Austin

12. “Jalapeno” Test Environment • PLD used for I/O routing to/from TDC • Micro used for power-up sequencing and interface to PC • TDC programming via JTAG • Current readout of TDC via JTAG as well • JTAG software interface via “Standard Test and Programming Language” (STAPL), a JEDEC standard (JESD71), originally the “JAM” Programming & Test Language from Altera • Free STAPL “player” available from Altera, including source code • Jam player code modified to write optional data files from JTAG output • Jalapeno used to learn the (rather complicated) HPTDC ASIC • Used to verify that proposed time resolution can be achieved • Initially used pulsers, then interface with prototype TFEE J. Schambach, UT Austin

13. HPTDC Architecture J. Schambach, UT Austin

14. Internal Time Resolution • HPTDC measures timestamps only • Pulse generated by TDC clock is used to reset TDC, so all data points fall into approximately the same bin • A delayed version of this pulse is used as hit (with delays generated by an HP8131A pulse generator) J. Schambach, UT Austin

15. TFEE and TDIG Time Resolution • Data from complete TFEE and TDIG chain • Input pulser lightly coupled and capacitively loaded to simulate MRPC’s J. Schambach, UT Austin