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Aerogel Radiator Status

Aerogel Radiator Status. Ichiro Adachi KEK PID session Open Meeting of the Super KEKB Collaboration 2008.12.11. Optical transparency improvement New production method Preliminary production plan. Transparency Improvement(1). Good target Novosibirsk aerogel n=1.055. TL= 62mm.

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Aerogel Radiator Status

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  1. Aerogel Radiator Status Ichiro Adachi KEK PID session Open Meeting of the Super KEKB Collaboration 2008.12.11 • Optical transparency improvement • New production method • Preliminary production plan

  2. Transparency Improvement(1) • Good target • Novosibirsk aerogel • n=1.055. TL= 62mm. • Thickness 18mm. • cf: KEK best one: TL~50mm Npe comparison to KMD (n=1.0455)、 Index difference ~20% Transparency difference ~14% Novo +9% +34% focus KMD Can we improve further ?

  3. Transparency Improvement(2) • Further improvements ? Transmission length at  = 400nm Step2: improve overall transmission level Step1: improve in index range~1.06 In focusing radiator scheme, this can have larger effect because higher index is used as downstream radiator ◆2005-2006 ▲2004 ■Before 2003 2nd generation

  4. New Production Method(1) • Two ways going on at Chiba Univ. & KEK • “pin-hole” drying method • artificial shrink of alcogel volume to make index (~density) bigger with keeping good transparency pin-hole n=1.048 TL=46mm n=1.061 TL=52mm alcogel 93mm 86mm Better! reference new sample vessel (Tabata san) Good results from the 1st test production

  5. New Production Method(2) • Introduce new solvent (precursor) instead of the present one of MS (methyl-silicate) 51 • Candidates: MS53, MS56 and MS57 • Really “new world”… No experience so far… • First synthesis using MS56 done last week • Need more time for optimization • First target: 3 month to get clear view (Ishii san & Suzuki san)

  6. Beam Test Plan • We would like to carry out beam test in May 2009 at Fuji • New aerogel radiators will be ready • Assume KEKB will be in operation

  7. Production Plan “Guess”timation Need ~300 tiles with 150mmx150mm size Production time is limited by capacity of supercritical drying facility at Panasonic Electric Works Company 30mm thickness: 25 tiles/batch 20mm thickness: 35 tiles/batch 20mm thickness: 300/35/0.75(crack-free) ~ 12 batches 1 batch takes 3.5 day

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