aerogel radiator status

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Aerogel Radiator Status Ichiro Adachi KEK PID session Open Meeting of the Super KEKB Collaboration 2008.12.11 1. Optical transparency improvement 2. New production method 3. Preliminary production plan

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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. - PowerPoint PPT Presentation

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Page 1: Aerogel Radiator Status

Aerogel Radiator StatusIchiro Adachi

KEKPID session

Open Meeting of the Super KEKB Collaboration2008.12.11

1. Optical transparency improvement2. New production method3. Preliminary production plan

Page 2: Aerogel Radiator Status

Transparency Improvement(1)

• Good target– Novosibirsk aerogel– n=1.055. TL= 62mm.– Thickness 18mm.• cf: KEK best one: TL~50mm

focus

Novo

KMD+34%

+9%

Npe comparison to KMD (n=1.0455) 、

Index difference ~20%Transparency difference ~14%

Can we improve further ?2

Page 3: Aerogel Radiator Status

Transparency Improvement(2)

• Further improvements ?

2nd generation

0

10

20

30

40

50

60

1.02 1.04 1.06 1.08Refractive index

Transmision length(mm)◆2005-2006▲2004■Before 2003

Transmission length at = 400nm

Step1: improve in index range~1.06

Step2: improve overall transmission level

In focusing radiator scheme, this can have larger effect because higher index is used as downstream radiator

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Page 4: Aerogel Radiator Status

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

93mm 86mm

n=1.061TL=52mm

n=1.048TL=46mm

alcogel

pin-hole

Good results from the 1st test production

(Tabata san)

reference new sample

vessel

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Better!

Page 5: Aerogel Radiator Status

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)5

Page 6: Aerogel Radiator Status

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

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Page 7: Aerogel Radiator Status

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/batch20mm thickness: 35 tiles/batch

20mm thickness: 300/35/0.75(crack-free) ~ 12 batches

1 batch takes 3.5 day

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