ICEBERG Study of Proto DUNE FEMB Paramters Shekhar

ICEBERG Study of Proto. DUNE FEMB Paramters Shekhar Mishra On Behalf of ICEBERG (BNL, Fermilab, SLAC, UK, PSL, CSU) Neutrino Division, Fermilab DUNE CE and PD Test @ Fermilab Meeting 4/2/2020

FEMB Parameters • Front End Gain - 4. 7 m. V/f. C, 7. 8 m. V/f. C, 14 m. V/f. C and 25 m. V/f. C • Front End Shaping Time - 0. 5 m. Sec, 1. 0 m. Sec, 2. 0 m. Sec and 3. 0 m. Sec • Front End Baseline - 200 m. V, 900 m. V and 200 m. V for Collection and 900 m. V for Induction • Front End Leakage Current - 500 p. A and 1000 p. A • AC/DC Coupling - DC Coupling and AC Coupling 2 4/2/2020 Mishra | ICEBERG Study of FEMB Paramters

Runs • We have taken 20 pulser run each - Varying one parameter in each subset while keeping all the other parameters to the default value. • For Example when Front End Gain was changed to 4. 7, 7. 8 and 25 m. V/f. C - Shaping Time = 2 m. Sec, - Baseline = 900 m. V, - Leakage current = 500 p. A - Coupling = DC 3 4/2/2020 Mishra | ICEBERG Study of FEMB Paramters

WIB Parameters (5349/5359) FEMBs: [ { { ac. Couple: 0 ac. Couple: 1 baseline. High: 1 buffer: 0 calibration_stepping: { amp_max: 9 amp_min: 3 amp_step: 1 mode: "disabled" phase_max: 249 phase_min: 189 phase_step: 1 step_time: 2 } 4 4/2/2020 } Mishra | ICEBERG Study of FEMB Paramters

Nominal FEMB setting Collection Plane Run 5349 5 4/2/2020 Mishra | ICEBERG Study of FEMB Paramters

Nominal FDEMB setting Induction Planes Run 5359 6 4/2/2020 Mishra | ICEBERG Study of FEMB Paramters

AC Coupling between FE and ASIC Collection Plane Run 5359 7 4/2/2020 Mishra | ICEBERG Study of FEMB Paramters

AC Coupling between FE and ASIC Induction Planes Run 5359 8 4/2/2020 Mishra | ICEBERG Study of FEMB Paramters

Summary • When the AC coupling between the FE ASIC and ADC is turned on the Collection plane ADC pulse shows a bipolar signal, in which the negative pulse has RC time constant of ~20 msec. • Matt Worcester: - The AC coupling on the FE ASIC is not compatible with the AC coupling between the FE and ADC ASICs on the proto. DUNE FEMBs, - So you'd expect some really abnormal behavior. - The FE ASIC AC coupling only makes sense if the FEMB's AC coupling is removed. - So on the proto. DUNE FEMBs the FEs should only ever be run in DC coupled mode. 9 4/2/2020 Mishra | ICEBERG Study of FEMB Paramters