1. Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19 th A new flash ADC for the DESPEC TOF neutron spectrometer daniel.cano@ciemat.es (Also: Neutron Wall/ SPIRAL2)

2. Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19 th 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.

3. Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19 th delayed total Photons Neutrons Pulse shape analysis for n/  discrimination with digital electronics (8 bits) developed at CIEMAT Pulse Shape Discrimination:

4. Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19 th PSA performance I DATA Fitted  shape Fitted n shape

5. Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19 th PSA performance II DATA Fitted  shape Fitted n shape

6. Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19 th Fit to True shape method: n/  discrimination + pileup reconstruction Neutrons Photons Excellent n/  discrimination + pileup reconstruction (tests with a Deuterium /Tritium source). C. Guerrero et al., submitted to NIMA

7. Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19 th Needs for the DESPEC array: Time resolution ~1ns. Set a 10 keV ee 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.

8. Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19 th 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 1 1 channel board coupled directly to the detector: low noise, no cables, on-line pulse shape analysis, potentially low transfer rate. Solution 2 Multichannel boards on a VME (or equivalent) bus. Time schedule 1 st Phase. Prototype board by end of 2008 2 nd Phase. Single channel board or VME multi channel module + event building module. End of 2009. Industrial production in 2010. 1 st 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.

9. Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Daniel Cano-Ott, DAQ meeting in Huelva, July 18 th and 19 th 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?