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Testing Infrastructure, Program and Milestones • Test Facilities • Testing Program for 2008 • Testing Infrastructure, Program and Milestones • Test Facilities • Testing Program for 2008 • Milestones Steffen Döbert, ACE, 17. 01. 2008

High Power test facilities at CERN Rf power production with CTF 3 Drive Beam High Power test facilities at CERN Rf power production with CTF 3 Drive Beam Injector Drive Beam Accelerator 16 structures - 3 GHz - 7 MV/m 4 A - 1. 2 ms 1. 5 GHz, 150 Me. V X 2 Delay Loop X 4 Combiner Ring 30 GHz Test stand 70 MW, 100 ns Probe Beam Injector 30 A - 140 ns 12 GHz, 150 Me. V Two Beam Test stand 12 GHz, 2008 200 MW, 140 ns TBL, 16*150 MW, 140 ns Automatic conditioning system controlling the experiments and the accelerator

30 GHz test stand in CTF 3 30 GHz test stand in CTF 3

Automatic conditioning using CTF 3 Check out the online results: http: //cern. ch/project-clic-rfcond 30/ Automatic conditioning using CTF 3 Check out the online results: http: //cern. ch/project-clic-rfcond 30/

X-band test facilities at SLAC • NLCTA: 3 Test Stations: 2 x 50 MW X-band test facilities at SLAC • NLCTA: 3 Test Stations: 2 x 50 MW into SLEDII, 300 MW , 240 -400 ns, fully automated conditioning • Klystron Lab: 2 single Klystron test stands 2 x 50 MW into SLED II ASTA bunker We agreed on planning for 9 testing slots this year

X-band Test Facilities at KEK Single Klystron (50 MW) test stand up and running X-band Test Facilities at KEK Single Klystron (50 MW) test stand up and running NEXTEF: Available from 2008, 2 x 50 MW, 400 ns, 24/7 operation (currently tested to 2 x 10 MW)

X-band Test Facilities at KEK Structure testing area inside the bunker We plan for X-band Test Facilities at KEK Structure testing area inside the bunker We plan for 3 experiments together with KEK this year

Stand alone X-band power source at CERN Single Klystron (50 MW) test stand with Stand alone X-band power source at CERN Single Klystron (50 MW) test stand with pulse compression at 12 GHz Modulator test slot 200 MW, 0. . . 100 ns or 100 MW, 0. . . 350 ns phase modulation hybrid Klystron 50 MW 1500 ns 50 Hz pulse compression Status: Approval of the finance committee for klystron purchase, Dec 2007 ~ 18 Months needed for construction (not before mid 2009)

Structure Program Philosophy 1. Gradient program (highest priority): Demonstrate a CLIC prototype structure: (100 Structure Program Philosophy 1. Gradient program (highest priority): Demonstrate a CLIC prototype structure: (100 MV/m, 200 -300 ns, 12 GHz, damping) 2. General high gradient R&D (high priority): Find the universal breakdown theory, P/C, phase advance, materials Try to do that with simple and clear experiments (single cells and short structures) 3. Fabrication technology (high priority): Disks, slots, quadrants, surface treatment, procedures Start with simple structures and experiments (single cells, DC-spark), eventually we need to go to full structures

30 GHz break down R&D program in CTF 3 List of planned experiments - 30 GHz break down R&D program in CTF 3 List of planned experiments - HDS 4_vg 2. 6_thick (iris thickness, phase advance, P/C) Finished ! - NDS 4_vg 2. 5_thick (Effect of slots and quadrants) Finished ! - C 30_vg 4. 7_quad (clear experiment for fab. Tech. ) Decision point, see flow chart ! - HDS 11_vg 2 (clear P/C experiment without other changes) - HDS 4_vg 2. 6_thick_clean (compares cleaning with previous) - NDS 4_vg 3. 6_thin (iris thickness in comparison with NDS 4_thick) - C 30_vg 2. 6 (P/C) - C 30_vg 8. 2 (P/C) - C 30_vg 4. 7_sb (speed bump) - C 30_vg 2_TM 02 (vg) - HDS 11 copper/molybdenum (for better statistics)

30 GHz flow chart 2007 HDS 4_vg 2. 6_thick (negative test result) NDS 4_vg 30 GHz flow chart 2007 HDS 4_vg 2. 6_thick (negative test result) NDS 4_vg 2. 5_thick (negative test result) C 30_vg 4. 7_quad Quads or slot are 2008 not a problem Input for x-band Quads or slot are a problem P/C ok HDS 11_vg 2 C 30_vg 2. 6 HDS 4_vg 2. 6_thick_clean C 30_vg 8. 2 NDS 4_vg 3. 6_thin New ideas if needed C 30_vg 4. 7_sb C 30_vg 2_TM 02

11 GHz CLIC structure program 11. 4 GHz: List of planned experiments - TD 11 GHz CLIC structure program 11. 4 GHz: List of planned experiments - TD 18_vg 2. 4_quad (CERN, VDL, Japanese industry) [2 x] (test of P/C, damping, quadrant technology) - T 28_vg 2. 9 (done by SLAC) (conservative approach) - T 18_vg 2. 4_disk (SLAC, KEK) [2 -4] {1 CERN, 2 SLAC/KEK (test 1 at SLAC and 1 at KEK), 1 KEK} (test of P/C in conservative technology, technology comparison) Decision point, see flow chart - T 18_vg 2. 4_quad (CERN) (test of P/C, quadrant technology) - TD 18_vg 2. 4_disk (CERN) [2 x] (mainly test of damping) - TD 28_vg 2. 9 (CERN) (back up test of damping if others are not successful) - T 24 vg 1. 7 (CERN); new CLIC structure

Parameters along the structures CLIC_vg 3/1 is more extreme in maximum surface field, pulsed Parameters along the structures CLIC_vg 3/1 is more extreme in maximum surface field, pulsed heating and lowest group velocity TD 28 vg 3 TD 18_vg 2. 4 75 35

New 11 GHz breakdown R&D program with short structures Probing different apertures, iris thickness, New 11 GHz breakdown R&D program with short structures Probing different apertures, iris thickness, structure length and transition between SW and TW regime - C 10_vg 1. 3 (close to old CLIC vg 1. 1) [2 x] - C 10_vg 3. 3 (T 53 input cell) [2 x] - C 10_vg 0. 7 [2 x] - C 10_vg 2. 2_thick [2 x] Structures made by SLAC with reusable coupler, The program is nicely complimenting SLAC’s efforts focusing on single cells Details in Ricardo's talk

Mile stones and decision points 100 MV/m average gradient for CLIC pulse length with Mile stones and decision points 100 MV/m average gradient for CLIC pulse length with good breakdown rate and acceptable efficiency > 10 % Similar performance with damping Similar performance, damping, better efficiency ‘CLIC prototype structure’ Fully featured structure HOM loads and s-BPM’s integrated (ASSET test ? ) 06/2008: Review manufacturing technology, optimization strategy, baseline geometry, rf parameters 12/2008: Review damping options and parameter optimization

11 GHz flow chart 2008 TD 18_vg 2. 4_quad T 28_vg 2. 9 T 11 GHz flow chart 2008 TD 18_vg 2. 4_quad T 28_vg 2. 9 T 18_vg 2. 4_disk CLICvg 1 geometry OK Disks OK Damping Not OK 2009 Quads OK +Damp TD 18_vg 2. 4_disk (T 18_vg 2. 4_quad) CLICvg 1 geometry not OK TD 28_vg 2. 9 T 24_vg 1. 7 Input from break down R&D CLIC prototype quads damped ? CLIC prototype disks damped 2010 Go towards more extreme structures CLIC prototype TD 28 like

Efficiency milestones 2009 P = 64 MW; 241 ns nb = 312 4/2008 P Efficiency milestones 2009 P = 64 MW; 241 ns nb = 312 4/2008 P = 70 MW; 295 ns nb = 359 12/2008 P = 111 MW; 102 ns nb = 66 4/2008 P = 102 MW; 113 ns nb = 93 done P = 134 MW; 104 ns nb = 27 100 MV/m loaded, 10 -6 break down rate, qb=4*109, 6 -8 rf period bunch spacing, P*pl/C = 18 Wue

Conclusions Ø First promising data points are existing Ø We have set up a Conclusions Ø First promising data points are existing Ø We have set up a coherent testing program with well defined and realistic goals Ø The program is constraint by the availability of testing slots Ø We have to rely heavily on our collaborations to succeed Ø We have powerful international collaborations to work on this problems

The end, reserve slides following The end, reserve slides following

Iris diameter and thickness scaling test geometrical variation of gradient d [mm] a [mm] Iris diameter and thickness scaling test geometrical variation of gradient d [mm] a [mm] 2. 66 2. 13 2. 00 1. 66 2. 53 Vg 0. 7 2. 85 1. 37 T 53 output 1. 0% 3. 0 3. 87 3. 89* CERN-X 1. 1% CLIC _vg 1 Input 2. 2% 30 GHz 2π/3 ≈2. 6% 4. 38 30 GHz π/2 7. 4% CLIC _vg 1 output 1. 0% Vg 1. 3 T 53 input* 3. 3% 30 GHz 2π/3 4. 7% 5. 00 1. 25 30 GHz 2π/3 8. 2%