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transport devices is sufficient to allow crossing of two vehicles. OCR Outputhelium feed lines to be used at stage 2. The space reserved to themachine with superconducting magnets and for the low and high pressuremachine, we have indicated in dotted lines the spaces reserved for a secondIn addition to the different components and necessary services of the LEPappear with their maximum dimensions.The section has been taken in a region of the machine where the componentsa magnet cell, as agreed on March 25th, 1980.The attached drawing ISR 237-1212 OB shows the main tunnel cross—section inThe LEP Tunnel CommitteeLEP TUNNEL CROSS SECTIONB-6SCAN -00092071.4.1980“°‘&tlliflllllllIIIIHIIIIIIIUIINIHHCERhI[lBRAJUES,GEhUHh%Drain duct OCR Output19•Reserve space for future cables18.17a Bus—bars for dipole excitation, 90 x 42 mm2Conductor for induction controlled transport system16aTransport devices15•Cooling water pipe for 60 KV distribution cables14.13. 60 KV distribution cablesControl cables12.11• 20/10 KV power cables380V power cables10.cablesR.F. phase reference cable, monitoring and tuning9•8• Reserve space for pumping systemBus-bars for QD and QF multipoles, 400 mm27aBus—bars for sextupoles, 150 mm2magnet cooling water (supply), N.D. 250 mmPipe for5•mmN.D. 2 5 0vacuum chamber cooling water (supply),Pipe for4•mmN.D. 2 50vacuum chamber cooling water (return),Pipe for3•2• magnet coclinq water (return), N.D. 250 mmPipe forRaw water pipe, N.D. 350 mm1•N0 DescriptionLIST OF SERVICE COMPONENTS

LEP Tunnel Cross-section

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