Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ...

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19th

A new flash ADC for the DESPEC TOF neutron A new flash ADC for the DESPEC TOF neutron spectrometerspectrometer

[email protected]

(Also: Neutron Wall/ SPIRAL2)



Prototype unit BC501A (NE213 = BC501) + 1

from Scionix (= EJ301)12.7cmx12.7cm (thick

detectors)

TOF spectrometer for DESPEC

A large spectrometer consisting in 150 NE213 liquid scintillator cells. Go for a digital Data Acquisition Sub-system.



delayed

total

Photons

Neutrons

Pulse shape analysis for n/Pulse shape analysis for n/ discrimination with digital discrimination with digital electronics (8 bits) developed at CIEMATelectronics (8 bits) developed at CIEMATPulse Shape Discrimination:

PSDpefastslow

,...),,(



PSA performance IPSA performance I

DATA

Fitted shape

Fitted n shape



PSA performance IIPSA performance II

DATA

Fitted shape

Fitted n shape



Fit to True shape method: n/Fit to True shape method: n/ discrimination + pileup discrimination + pileup reconstructionreconstruction

Neutrons

Photons

Excellent n/ discrimination + pileup reconstruction (tests with a Deuterium /Tritium source).

C. Guerrero et al., submitted to NIMA



Needs for the DESPEC array:

•Time resolution ~1ns.•Set a 10 keVee threshold.•Set a 20 MeVee range.•Good n/ discrimination down to low neutron energies.•Reasonable cost ~1000 € per channel (commercial units 4000 € per channel)

Such characteristics could be reached with a 12 bit and 1 Gsample/s (500 MHz bandwidth) flash ADC. No commercial digitiser of such characteristics is available at present time and when, it will cost about 4000 €/channel. Such a digitiser could be considered as a universal ADC optimal for a wide range of detector types.

Combined know how at CIEMAT (electronics and nuclear physics group):

-20 years of experience in electronics for particle physics experiments at CERN.-Electronics for the CMS experiment at CERN.-Electronics for the AMS experiment at the International Space Station.-Detector design.-Digital DAQ software for n_TOF experiment at CERN (50 channels, 8 bit, 1 Gsamples/s)-Pulse shape analysis algorithms.



Develop such a digitiser at CIEMAT•Two interlaced 500 Msamples/s 12 bit ADCs.•FPGA + fast enough DSP.•2 Gbytes on board memory.•On board pulse shape analysis OR fast data transmission.•fast data bus (not yet decided).•Cost estimate: 1000 – 1300 €

Solution 11 channel board coupled directly to the detector: low noise, no cables, on-line pulse shape analysis, potentially low transfer rate.Solution 2Multichannel boards on a VME (or equivalent) bus.

Time schedule•1st Phase. Prototype board by end of 2008•2nd Phase. Single channel board or VME multi channel module + event building module. End of 2009.•Industrial production in 2010.

1st funding request made already (waiting for the evaluation). If positive, then…Next funding request for 2009.Production of 150 channels in 2010 to be negotiated as a Spanish in-kind contribution to DESPEC.



The project has not even started. Many open questions!

Platform: single boards, VME cards ???Characteristics of the boards: input range, amplification…Data bus?How to collect the data and build an event? Which type of module?How to integrate the flash ADCs into the DESPEC/HISPEC DAQ?

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ...

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