ckov-1 progress

CKOV-1 PROGRESSL. Cremaldi, D. Summers,

R. Godang, M. Reep, B. RankinsU. Mississippi

MICE MEETING- FrascatiJUNE 25, 2005

• Simple Design, PID Redundancy, Immune to Decay in Flight.

•Aperture based on Tom Roberts beam spread plots at CKOV1. Sizing the radiator aperture at R =230mm.

•The window will be fused silica 1/8-1/4 inch or UVtransmitting glass (Suprasil, etc. ).

•Light collection by 4 flat triangular mirrors + 4 x 8” PMTs (+ cones??) - Baseline.

•Light collection studies underway to determine mirrortype (focusing/flat), position etc. - RayTracing.

•Radiator for p = 240-280 MeV/c challenging!C6F14(n=1.25), LN2(n=1.205), Aerogel(n=1.12) under study.

•G4MICE cross checks by Steve Kahn important.

CONCEPT

Acceptedmuons

Acceptedmuons

MUON BEAM at CKOV1

23cm

23cm

C6F14Chamber

8”od

3”od

4”4”

53 o

6”

20” 53o18”

2.25”

1/8” Al

1/8” GlassMIRROR

1/8” GlassMIRROR

1/8”x 19” od Quartz Window

8” PMT

3”

24”

BaseLine Design

Radiators and Momentum Thresholds

C6F14 n=1.251

LN2 n=1.205

AEROGEL n=1.12

CKOV1- Monte Carlo 10 cm FC72 Radiator (n=1.25) at 240, 280 MeV/c

79 126

pions

muons

240 MeV/c10 cm FC72

280 MeV/c10 cm FC72

134 170

muons

pions

66 98

pions

muons

280 MeV/c10 cm LN2

240 MeV/c10 cm LN2

38 82

pions

muons

CKOV1- Monte Carlo10 cm LN2 Radiator (n=1.20 ) at 240, 280 MeV/c

2

16

pions

muons

240 MeV/c10 cm FC72

280 MeV/c10 cm FC72

3

28

muons

pions

CKOV1- Monte Carlo 10 cm AEROGEL (n=1.12) Radiator at 240, 280 MeV/c

Dear Prof. Don Summers:

Thank you for your inquiry for our silica aerogels.

My name is Hiroko Hasegawa, in Matsushita Electric Works, Ltd.

We don't have any products of high index ( n=1.08 and 1.12 ) aerogel tiles.On the other hand, we could develop them if you would require more than 10 liters and the price could be matched.However, they should not be transparent (clouded or translucent).

We hope to hear from you.

Sincerely yours,

Hiroko Hasegawa

+++++++++++++++++++++++++++++++++++++++++Hiroko HasegawaCoating Business Promotion GroupNew Business Promotion DepartmentMatsushita Electric Works, Ltd1048 Kadoma,Osaka,571-8686 Japan<TEL> +81-6-6906-2018 (MIC:8711-2104)<FAX> +81-6-6904-4457<Address> hhasegawa@mewe1.mewnet.or.jp+++++++++++++++++++++++++++++++++++++++++

Hello I'm interested in some high index (n=1.08 and n=1.12) aerogel tiles.Might you be able to supply such a product?

Best Regards,

Don Summers, Ph.D.

HIGH INDEX AEROGEL INQUIREY - Matsushita

LN2 CONCEPT

Foam Insulation

LN2 Reservoir

Vacuum Window

Light Box

N2 Flush

Cryo Engineering

•Foam Insulation •Vaccuum Windows•Humidity Control•N2 Flush•Thermal Radiation? P = (TLn2

4 - Tbox4 )

Muonhodoscope

Ray Tracing

y

xz

y

•MIRROR SEGMENTATION and LIGHT COLLECTION BAFFLES BEING STUDIED.

2 bounce

LIGHT COLLECTION at PMT SURFACES

z

x

y

1

2

3

4

250 MeV/cMuonsLN2

Beamspread

1 2

3 4

geo~50%

LIGHT COLLECTION OPTIMIZATION

35o

Tilting Wing Mirrors by ~35o in each quadrant- Poor Mans Focusing.

90%

PRELIMINARY EFFICIENCY SCAN

x-position (cm)

SUMMARY

• Further Scrutiny of 4- Mirror Baseline Design.• Efficiency Scans - Promising - Further studies. • High Density Aerogel a good choice 240-280 MeV/c.

-but poor Transparency !!• LN2 New Baseline for (240-280) MeV/c!•Some advantage to adding Muon Position Hodoscope in PID Reco Algorithm.

• RayTracing Optimization of Mirror and PMT Components In Progress.

•Test Beam in Fall 05.• Performance Tests in G4-MICE.• Full Design by Jan 06. Mechanical Drawing etc.

Radiators and Momentum Thresholds

00 deg165

15 deg165

30 deg165

45 deg334

60 deg386

75 deg379