The BDS collimation system and muon spoilers R. Tom as, D. - - PowerPoint PPT Presentation

The BDS collimation system and muon spoilers

• R. Tom´

as, D. Angal-Kalinin, J. Gatignon,

• D. Schulte, J. Resta-Lopez, G. Zamudio

CLIC workpackages for STI March 2010

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.1/11

Contents

• Lattices and layouts at 500 GeV and 3 TeV
• The collimators as a passive protection

system

• Muon spoilers to stop muons before the IP

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.2/11

The 500 GeV BDS

50 100 150 200 250 300 350 400 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

• 0.3
• 0.2
• 0.1

0.1 0.2 0.3 0.4 β1/2 [m1/2] D [m] Longitudinal location [km] Diagnostics Collimation Final Focus system βx

1/2

βy

1/2

Dx

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.3/11

The 3 TeV BDS

100 200 300 400 500 600 0.5 1 1.5 2 2.5 3

• 0.05

0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 β1/2 [m1/2] D [m] Longitudinal location [km] Diagnostics Energy collimation Transverse collimation Final Focus system βx

1/2

βy

1/2

Dx

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.4/11

The layouts

• 0.7
• 0.6
• 0.5
• 0.4
• 0.3
• 0.2
• 0.1

0.1 0.2

• 3000
• 2500
• 2000
• 1500
• 1000
• 500

x[m] s[m] IP 3TeV 20mrad 500GeV 18.6mrad linac (0.6mrad) 3Tev e- BDS 500Gev e- BDS collimators

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.5/11

The collimators

Name βx βy Dx ax ay Geom. Mat. [m] [m] [m] [mm] [mm] EYSP 1406 70681 0.27 3.51 25.4 rect Be EYAB 3213 39271 0.42 5.41 25.4 rect Ti the following ×4 YSP1 114 483.2 0. 10. 0.12 rect Be XSP1 270 101.3 0. 0.12 10. rect Be XAB1 270 80.90 0. 1. 1. ellip Ti YAB1 114 483.1 0. 1. 1. ellip Ti

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.6/11

The Be spoiler

• rad

θ =0.03

T

0.5 X = 17.65 cm Be

a=3.51 mm b=6.21 mm 2 mm

z

1.5 TeV e beam

−

First design. Presently under optimization.

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.7/11

Temperature after beam impact

20 40 60 80 100 120 140 140 160 180 200 220 240 260 280 Distance [mm] Temperature increment [K] Increment of temperature in a Be spoiler with shallow tapers (no body) hit by a CLIC train

No risk of melting, but possible micro-fractures?

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.8/11

The tunnel

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.9/11

ILC muon spoiler

To stop the CLIC muons this approach needs widening of the tunnel for few 100 m filled with iron.

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.10/11

Lau’s recent proposal

This approach looks much more advantageous, precise calculations are needed.

Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.11/11