Update from Wellesley SF6 + Micromegas & Multi-channel DAQ

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Presentation transcript:

Update from Wellesley SF6 + Micromegas & Multi-channel DAQ James Battat & Catherine Nicoloff 2017 June 7

Summary Detector description Single-channel work: Fe-55 spectra with Micromegas in 30, 40 and 50 Torr SF6. Now integrating preamp pulses (no shaper) DAQ electronics from BNL for 1000-channel readout. Development of FPGA back-end to handle data stream (buffer, trigger, save).

micromegas

10 x 10 cm2 Gap: 128 um and 256 um Strips: * 200 um pitch * 500 channels in x, * 500 in y

Resistive strip micromegas J. Burnens, R. de Oliveira et al Resistive strip micromegas J. Burnens, R. de Oliveira et al., arXiv:1011.5370

Effective gas gain vs. drift field, 30 Torr Fixed ampl: 550V over 256um = 21.5 kV/cm = 720 V/cm/Torr 400 Vdrift = 1250V From last presentation (used a shaper) Gain 150 4 16 Reduced Drift Field [V/cm/Torr] Vdrift = 750V Note: results are from an automated fitting routine that is still under development, some wiggle in y-values expected as we refine...

Gas gain studies: system diagram (single channel readout) to scope (then integrate waveforms off-line) = Vamp = Vdrift

SF6 results Gas gain demonstrated at 30, 40 and 50 Torr SF6 using a 256 um gap micromegas. Have not yet (re)visited 20 Torr. Max gain so far is ~2000 (in 40 Torr) (though gain calibration very preliminary, trust at 50% level...). Have a 128um device (not yet used in SF6). Interested to buy a 512um device from CERN.

Brookhaven National Lab DAQ Developed or LAr, but works with NITPC At BNL, help from: Drs. Hucheng Chen and Gianluigi de Geronimo and Jack Fried Custom FPGA development (Back-end) by Wellesley & Boston University (Prof. Martin Herbordt and grad student Ethan Yang). Have demonstrated circular buffer with 31 Gbps throughput. Challenge: BNL Front-End FPGA code is undocumented...

Paper written for IEEE High Performance Extreme Computing 2017 Conference

Slides from last time (2017-01-18) for reference

First believable spectrum (30 Torr) Vamp = 555 V (256um gap) Eamp = 21.7 kV/cm = 720 V/cm/Torr Vdrift = 1050 V Edrift = 330 V/cm = 11 V/cm/Torr Gas gain ~ 260

Effective gas gain vs. drift field, 30 Torr Fixed ampl: 550V over 256um = 21.5 kV/cm = 720 V/cm/Torr 400 Vdrift = 1250V Gain 150 4 16 Reduced Drift Field [V/cm/Torr] Vdrift = 750V Note: results are from an automated fitting routine that is still under development, some wiggle in y-values expected as we refine...

Gas gain vs. amplification, 30 Torr Fixed Vdrift (oops) = 1200V Gas gain vs. amplification, 30 Torr Fixed Vdrift (oops) = 1200V. Drift field range: 420 to 450 V/cm Gas Gain (effective) 1000 100 Amplification Field [V/cm] Vamp range: 530 to 575V Eamp/P range: 690 to 750 V/cm/Torr 1e4 1e5