Sheffield - Headline News NaI SMALL ARRAY DM55(high gamma background) vs. DM46 -> similar bump rate DM48 -> some evidence for a bump? DM50 (QMW) -> abandoned.

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Presentation transcript:

Sheffield - Headline News NaI SMALL ARRAY DM55(high gamma background) vs. DM46 -> similar bump rate DM48 -> some evidence for a bump? DM50 (QMW) -> abandoned beta tests finished V4 labview DAQ installed and running (G3s, individual cooling, new air conditioning) Saclay 9 kg crystal to be installed on 12th July propose to accelerate QMW purification programme propose test with different Tl content, radon diffusion, DM29 n-beam tests of NaI pulse shape, possible gamma coincidence NAIAD (50+ kg) 8 (14) pe/keV obtained with 8.5 kg 12 cm (0 cm) oil lightguides (possible high resolution detector option) success of PPX NaI coating MC results based on new PMT activity -> we can use ~15 cm LGs NAIAD module 1 now underground, 2 more being constructed single NAIAD Compton veto under construction full veto depends on NAIAD-1 tests but does not look cost effective basic VME-Linux daq system running in the lab DRIFT R&D objective: TPC to measure CS 2 track diffusion over full 1m develop solid state readout technique (Surrey, RAL, Tokyo?) n-beam test of Ar track lengths planned with small chamber UK: US: electron and alpha rejection tests, new shallow underground site gas mixture diffusion tests, head-tail discrimination

demonstration by (e.g.): A. Reskin et al. NIM A394 (1997) 21 L. Antonuk et al. Med. Phys. 19 (1992) 1455 J. Rowlands, Physics Today, Nov x 10 3 gain a-Si:H SiN Mo Al NOT new technology gas avalanche at pixel provides low noise Future DRIFT (= future liquid Xe) improves track resolution and hence discrimination eliminates problems with wire electronics replace wire readout: microdots, microstrips and GEMs (1) a-Si:H Gas Microdot Readout (Surrey) (2) Microstrip Readout demonstration by (e.g.): J. van der Marel (1997) [Should be slide of Surrey results with 55 Fe 

CS 2 diffusion - small (15cm?) chamber

 tracks % rejection at 6 keV

 tracks % rejection at 6 keV (2)

Stage 1 DRIFT sensitivity 1 year 1 m 3, 40 Torr Ar (Xe) 36 kg.d improves as (Mt) 1 direction sensitive scale-up x d pixel readout Stage 1 prototype Full DRIFT experiment

NaI modules flexible design allows NaI and photomultiplier movement and changes First NAIAD module constructed 5-10 kg unencapsulated NaI crystal PTFE light guide paraffin photomultiplier cooling

Veto engineering drawing

Veto Monte Carlo