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Long Transfer Lines in the main tunnel

Long Transfer Lines in the main tunnel. B.Jeanneret CERN / AB CLIC Workshop, Oct 2008. Outline. Long transfer line, Main + Drive Beam Optics + longitudinal layout Transverse layout Integration in the tunnel (space reservation …) Issues related to turnaround

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Long Transfer Lines in the main tunnel

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  1. Long Transfer Linesin the main tunnel B.Jeanneret CERN / AB CLIC Workshop, Oct 2008

  2. Outline • Long transfer line, Main + Drive Beam • Optics + longitudinal layout • Transverse layout • Integration in the tunnel (space reservation …) • Issues related to turnaround • Issues around the dump sections Long Transfer Lines, CLIC08 , BJ

  3. Long Transfer Lines, CLIC08 , BJ

  4. Kicker … QD QF Sector 877 m Decelerator 24 times Long DB transfer line • Aim : transport the Drive Beam trains from the central area of the site towards the head of the Main Linac • Deflect a train in each turnaround, one after the other Long Transfer Lines, CLIC08 , BJ

  5. L = 877 m DB Sector C1 C2 C8 SE KE L = 109.6 m Cell C1..C8 AF AD Assembly AF VAC BPMH QF+DH VAC L < 2m AD VAC BPMV QD+DV VAC L = 877 m MB Sector C1 C2 L = 438.5 m Cell C1,C2 AF AD Assembly AF VAC BPMH QF+DH VAC L < 2m AD VAC BPMV QD+DV VAC Layout by Sector For Drive Beam & Main Beam Long Transfer Lines, CLIC08 , BJ

  6. Magnets, DB & MB • Quadrupole and dipole embedded • Forces • Quad : Gl = 0.14 Tm/m • Dipole : Bl = 0.03 Tm • Same for DB & MB • > not demanding for electrical supply & cooling • Length : as yet free • say l < 2 m • MB : need solid static positionning (yet to make it a specification) • Need free space for survey Tunnel ceiling Magnet external envelope Vacuum Long Transfer Lines, CLIC08 , BJ

  7. Need more clearance For support & adjustments Need open access For survey Long Transfer Lines, CLIC08 , BJ

  8. Turnaround :A first look at integration issues Long Transfer Lines, CLIC08 , BJ

  9. Turnaround as of today , F. Stulle/PSI (this w’shop) ~ 27m Shall we install this in the Main tunnel ? Dipoles : L=1m, section .4x.4 m2 Weight ~ 1 ton -> need more work Recent input : Decelerator length and DB sector no more equal Implies : ‘5th’ beam line of length [0..200]m depending on sector position Long Transfer Lines, CLIC08 , BJ

  10. By Courtesy of J. Osborne and A. Kosmicki Long Transfer Lines, CLIC08 , BJ

  11. ~100m Kicker … QD QF Sector 870 m DUMP line Drive Beam dumps :A first look at integration issues Long Transfer Lines, CLIC08 , BJ

  12. Dump dipoles, +- 200 mm high NEW DB View from side SIDE VIEW NEW DECEL OLD DECEL TOP VIEW View from top 2.5 GeV 0.25 GeV Spot ~3-4m radially at ~20m on dump Width of DB quads Long Transfer Lines, CLIC08 , BJ

  13. Entering turnaround Common section : ‘5th beam line’ + Descending fresh DB Exit line used DB Last part of turnaround To dump Many unresolved issues … Long Transfer Lines, CLIC08 , BJ

  14. Summary • Long transfer line • Compact and light combined magnet are considered • Conflict services / beam line / survey must be resolved • DB Turnarounds • Optics exists, but need to adapt to C.E. constraints • ‘5th Beam line’ between TA and input decelerator • Now non-negligible fraction of the linac length • DB Dump line • Short 10m section with two lines must be studied • Dump exit through main tunnel to be solved (water pipe on the way) • Dump proper still to be designed Long Transfer Lines, CLIC08 , BJ

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