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 Diagnostics Collimation Final Focus system 400 0.4 1/2 β x 350 1/2 β y 0.3 D x 300 0.2 β 1/2 [m 1/2 ] 250 0.1 D [m] 200 0 150 -0.1 100 -0.2 50 0 -0.3 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Longitudinal location [km] Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.3/11

The 3 TeV BDS Diagnostics Energy Transverse Final collimation collimation Focus system 600 0.45 1/2 β x 0.4 1/2 β y 500 0.35 D x 0.3 400 β 1/2 [m 1/2 ] 0.25 D [m] 300 0.2 0.15 200 0.1 0.05 100 0 0 -0.05 0 0.5 1 1.5 2 2.5 3 Longitudinal location [km] Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.4/11

The layouts 0.2 500GeV 18.6mrad 0.1 linac (0.6mrad) IP 0 -0.1 3TeV 20mrad -0.2 x[m] -0.3 -0.4 3Tev e - BDS -0.5 500Gev e - BDS collimators -0.6 -0.7 -3000 -2500 -2000 -1500 -1000 -500 0 s[m] Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.5/11

The collimators Name Geom. Mat. β x β y D x a x a y [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 0.5 X = 17.65 cm 0 ��������������������� ��������������������� − ��������������������� ��������������������� 1.5 TeV e beam Be ��������������������� ��������������������� 2 mm θ =0.03 ��������������������� ��������������������� b=6.21 mm rad T ��������������������� ��������������������� a=3.51 mm z First design. Presently under optimization. Rogelio Tom´ as Garc´ ıa The BDS collimation system and muon spoilers – p.7/11

Temperature after beam impact Increment of temperature in a Be spoiler with shallow tapers (no body) hit by a CLIC train 280 260 Temperature increment [K] 240 220 200 180 160 140 0 20 40 60 80 100 120 140 Distance [mm] 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