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TOF Front End electronics

TOF Front End electronics. Reminder: TOF requirement Time Walk correction Open options Constant Fraction Discriminator Charge Measurement Time over Threshold Measurement . TOF Requirements. Time resolution: 50-70 ps resolution

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TOF Front End electronics

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  1. TOF Front End electronics • Reminder: TOF requirement • Time Walk correction • Open options • Constant Fraction Discriminator • Charge Measurement • Time over Threshold Measurement Jean-Sébastien Graulich

  2. TOF Requirements • Time resolution: 50-70 ps resolution -> Choice of TDC: CAEN V1290 (25 ps LSB, >1000 Evt buffer) • Particle rate ~ 2 MHz in TOF0 • Charge measurement is not required Jean-Sébastien Graulich

  3. Time Walk Correction • Timing is affected by the signal amplitude • 2 Usual Solutions: • Use Constant Fraction Discriminator (CFD) • Measure amplitude and correct Time Walk Time Walk Correction Thresh. Time over threshold Example from Harp Jean-Sébastien Graulich

  4. Possible Options Option 1. Constant Fraction Discriminator (CFD) The time walk is corrected automatically in the discriminator Threshold value depends on the amplitude • Advantage: Easy Cabling and No ADC • Drawback • No information at all on the charge (Energy Deposit) • Cost: TDC + ~ 125 EUR/ch (CFD) BNC Cable CFD TDC PMT Trigger Logic Jean-Sébastien Graulich

  5. DISCRI TDC BNC Cable Splitter PMT Trigger Logic Cable Delay QDC Gate Signal Possible Options Option 2. Measure the Charge with a QDC • Advantage: More Precise andGood Charge Measurement • Drawback • General MICE ADC problem (No suitable QDC exists yet!) • Requires Splitters • More cabling • Cost: TDC + ~ 125 EUR/ch (DISC) ~ 200 EUR/ch (QDC) ~ Delay Cables (~20 m/ch)(Assuming free splitters) Jean-Sébastien Graulich

  6. Possible Options Option 3. Measure the Charge with any available Solution • Same Advantages and Drawbacks as 2. • Cost: TDC + ~ 125 EUR/ch (DISC) ~ ??? EUR/ch (ADC) ~ Delay Cables (~20 m/ch)(Assuming free splitters) Jean-Sébastien Graulich

  7. Possible Options Option 4. Measure the Charge with Time Over Threshold Principle • Advantage: Easy Cabling andCharge Measurement (not linear though)Good Precision for Time Walk Correction • NINO = ASIC developed by CERN/MIC for Alice TOFDiscriminator with ToT “proportional” to the Charge (at low amplitude) Proven technique, providing 50 ps resolution (IEE TNS Vol 51-5 (2004) 1974-1978)Very Cheap: 2 EUR/ch • Drawback • Requires Board development ! • Cost: TDC + Discri. board production (~50 EUR/ch) TDC PMT NINO Rising edge + Trailing edge Time Measurement Trigger Logic Width ~Charge Jean-Sébastien Graulich

  8. Plan • Options 1. and 2. Will be tested in June/July at BTF • Additional Test with TDC CAEN V775 to allow comparing with previous results (HARP) • Options 3. and 4. are under investigation Jean-Sébastien Graulich

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