1. STaRBoard Jamal Rorie 5/09/06 Physics 476

2. Why do we need ToF info? Used to determine species of particle –Central Drift Chamber records path –ToF records time –B = 1.5T –Apply Lorentz Force Law

3. Why do we need to upgrade? Currently Belle has a luminosity of 1.6x10 34 cm -2 /s New technique: crabbing the beam Belle luminosity will be ~2-3x higher Background will be ~2-3x higher as well Old ToF is not fast enough to handle this; a new technique must be tested

4. Data Collection TDC Leading Edge Lo Level Discriminator Mean Timer 1:3 Splitter ADC Leading Edge Hi Level Discriminator Leading Edge Lo Level Discriminator TDC 1:3 Splitter Leading Edge Hi Level Discriminator ADC PMT

5. Timing Scheme What did the PMT know and when did it know it? Hi level - event trigger Lo level - higher time resolution

6. Readout Scheme Event trigger received by STaR Logic request to TDC TDC polls for “hit” around requested time TDC sends data, Logic queries ADC No TDC data, Logic doesn’t query ADC ADC sends data COPPER I/O carries data downstream Hit No Hit

7. COPPER COmmon Pipelined Platform for Electronics Readout One standardized card can control up to 4 boards

8. STaR Layout HPTDC LAB3 XC3S2000 COPPER 16 CLK

9. The STaR Board

10. LABRADOR3 8 Input Channels

11. HPTDC 32 input channels –only 8 used when configured for high precision

12. Spartan3 456 pin pkg (340 used)

13. ADC Block ADC –LABRADOR3 STaR takes in differential signal from upstream –lower noise –modifications necessary Shaper to elongate signal –Originally 3 GSPS –Now 100-300 MSPS

14. TDC, Logic, and I/O Blocks (not quite as exciting) TDC –ECL-to-LVDS –HPTDC Logic –Spartan3 2000 I/O –COPPER

15. Testing Shaper Test –Elongation good –Standard delay confirming

16. Tasks Currently –Firmware development –Board population Ahead –Software development –Firmware testing –Finalization –KEK observations (mid-July)

17. Online Documentation http://www.phys.hawaii.edu/~jrorie –Schematics –Updates –Code –Datasheets