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introduction to the EDELWEISS DM search signal properties electronic DAQ setup DAQ software

Readout System for the Edelweiss Dark Matter search. introduction to the EDELWEISS DM search signal properties electronic DAQ setup DAQ software first results with the new system. Scatt. WIMP. WIMP. Count rate: < 10 -2 evt/kg/day!. Recoil nucleus  E R ~10 keV.

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introduction to the EDELWEISS DM search signal properties electronic DAQ setup DAQ software

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  1. Readout System for the Edelweiss Dark Matter search introduction to the EDELWEISS DM search signal properties electronic DAQ setup DAQ software first results with the new system

  2. Scatt. WIMP WIMP Count rate: < 10-2evt/kg/day! Recoil nucleus  ER~10 keV physics and principles behind EDELWEISS problems: low event rate background events by: β, γandneutrons muon induced background simultaneous measurement of heat and ionization energy Ge-Detector at 18mK EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  3. bolometer signals 2 heat signals: rise time ~1ms decay time ~100ms from NTD thermal sensor 4 ionization sig.: rise time <1µs decay time ~10ms from interleaved ring electrodes 100 kHz heat channel heat pulse ADC-Counts ADC-Counts 1 2 3 Time in ms Time in ms NTD NTD EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  4. EDELWEISS-II hardware setup • special requirements: • low noise • low radioactivity inner shielding cryostat shielding electric wire: ext. clock advantage: independent DAQ branches -> experiment continuous if one component fails optical fibre: voltage, bias: EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn analog amplification at 100K with FET BBv2: analog/digital conversion at room temperature detector at 18mK distribution-card: conversion to ethernet packages, distribution of commands and clock data acquisition, triggering and storage (DAQ) continuous control

  5. EDELWEISS 2 → EDELWEISS 3 pb →pb 10 ID-400 detectors → 40 FID-800 detectors upgraded cryogenics new inner shield new cabling new readout integrated DAQ additional time-resolved ionization signal EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  6. 1x new integrated DAQ system FLT = First Level Trigger card, historical name SLT = Second Level Trigger card = Master card 1x 80 - 120x 40x data acquisition, triggering, clock also used in Auger and KATRIN inner shielding Cryostat outer shielding 1 integrated FPGA based DAQ electronics trigger closer to the detector -> faster trigger for the 40MHz signal EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn analog amplification at 100K with FET BBv2: analog/digital conversion, modify to 40MHz detector at 18mK data acquisition, triggering and storage (DAQ) continuous control

  7. Ionization channel electronics - with resistors or relays Ionization pulse gives a step function followed by an exponential decay Ionization pulse gives a step function – no decay after some time one has to reset with the relays to avoid ADC and capacitor saturation EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  8. sampling of analogue data: in-house design bolometer box is the hardware control interface to the detector receives commands and clock from a distributor card DACs for applying bias to NTD and voltage to electrodes 6 channels with up to 200kS/s each, 16bit (100kS/s used) 2 channels with 40MS/s, 16bit and 2MS ring-buffer (50ms) (time-resolved ionization signal) EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  9. time resolved ionization readout so far: 100kS/s  integrated ionization signal idea: time resolved ionization channels  position information of events (z-axis) implemented: faster sampling  40MS/s needed: internal fast trigger for event based readout (100kS/s ionization pulse triggers readout) Broniatowski, A. et al. Physics Letters B 681 (2009) B C D surface event with calibration source EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  10. Data volume 40 bolometers x 6 channels x 16 bit x 100 kHz = 384 Mb/s (+ commands, headers,…) -> with 1 Gb/s ethernet one can stream all channels ~500 Mb/s for 40 MHz fast channel readout e.g. readout 4 FIC for 100 µs: or 0.5 ms transfer time NTD NTD EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  11. electronic components installed in Modane 1K 100K 300K 10mK 100mK 1K 100K 300K EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  12. Modane Crate – 20x FLTMini Crate – 4x FLT EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  13. Connection scheme Master Card BB1 Backplane FLT card (20x) 16x FIFO BB2 commands clock PCIe interface BB1 fiber in/out up to 6 BBs BB1 PCIe FPGA ALTERA cyclone II BB23 powerful Computer open SUSE 12.2 graphical user interface 2 programs readout loop (SAMBA backend) ORCA backend ring buffer QDR RAM ? EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  14. Integration of external detectorsMuon-Veto System 1 FLT card is configured to readout the Muon-Veto card Muon-Veto card is connected with a pair of fiber, like a BBv2 FLT sends 48 bit timestamp to Muon Veto Muon Veto attaches 6 bit Veto status and sends 54 bit back FLT checks timestamp if it is still correct EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  15. Muon-Veto readout and processing 48 bittimestamp (10µs) FLT in Veto –mode check timestamp Veto-Card in VME Crate 48 bittimestamp (10µs) 6 bit Veto status 000000000, Status 5…0, ERROR 16 bitmsbtimestamp 16 bit medium sbtimestamp 16 bitlsbtimestamp 0000000000000000 0000000000000000 000000000000000000000000 Crate PC SAMBA PC usedastrigger/vetosignal EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  16. ORCA based control interface ORCA is a DAQ software for low-level hardware control/readout and high-level experimental configuration and run control read / write access to all Crate registers useful for setup or initialize the Crate e.g. in a test mode, or to crosscheck settings configured by SAMBA ORCA interface is under development, new functions are implemented at the time. [Till Bergmann] Other experiments using ORCA: e.g. SNO, Majorana, KATRIN, EXO http://orca.physics.unc.edu EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  17. SAMBA DAQ System – in-house developed EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  18. _ Xi+ _ Xi- _ Xi+1 …. _ _ _ Xi = |Xi+ - Xi-| trigger algorithm T0: heat channel(s) 3. filter 1. heat signal 100kHz 2. heat signal 500Hz 4. heat trigger < S of N thresh. T1: ionization channel(s) 3. subtract plots 1. ionization signal 100kHz 4. filter 5. ion. trigger Ai < < __ A S of N 2. teach-in a periode thresh. Metadata: trigger rate, noise power, event maximum, event timestamp EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  19. different trigger levels & additional detectors Taking external detectors into account: muon veto system e.g.: trigger on all channels (2x heat and 4-6 ionization) trigger on all heat channels only trigger on 1x heat and 1x ionization channel geometrical selection of readout channels EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

  20. Projection EDELWEISS-3 40 Bolometer x 6 Channels 16bit ADC, 100kHz up to 40 MHz time resolved ionization channel integrated DAQ optimized shielding test for EURECA DAMA/LIBRA (3s) CRESST (2s) CoGeNT ROI (90%CL) CDMS+EDELWEISS (90%CL) ZEPLIN III (90%CL) CDMS Low Mass (90%CL) Xenon10 Low Mass (90%CL) EDELWEISS-III 3000 kgd(90%CL) Xenon100 (90%CL) EDELWEISS-III (3000 kg.d background free) Trotta et. al. (95%CL) Buchmueller et. al. (95%CL) EDELWEISS -- readout system | joint AMS EDELWEISS meeting Bernhard Siebenborn

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