1. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini1 Status of the CLIC Two-Beam Test Stand 1

2. Presentation plan 1.From CLIC to CTF3 2.Main CTF3 elements and their working –Drive beam –Delay loop –Combiner ring –Probe beam (CALIFES) 3.The TBTS –Characteristics –Very first results obtained 4.The future operations on the TBTS XB-10 1st December 2010TBTS Status- Wilfrid Farabolini2

3. World-wide CLIC&CTF3 Collaboration 38 Institutes from 19 countries Helsinki Institute of Physics (Finland) IAP (Russia) IAP NASU (Ukraine) IHEP (China) INFN / LNF (Italy) Instituto de Fisica Corpuscular (Spain) IRFU / Saclay (France) Jefferson Lab (USA) John Adams Institute/Oxford (UK) Polytech. University of Catalonia (Spain) PSI (Switzerland) RAL (UK) RRCAT / Indore (India) SLAC (USA) Thrace University (Greece) Tsinghua University (China) University of Oslo (Norway) Uppsala University (Sweden) UCSC SCIPP (USA) Aarhus University (Denmark) Ankara University (Turkey) Argonne National Laboratory (USA) Athens University (Greece) BINP (Russia) CERN CIEMAT (Spain) Cockcroft Institute (UK) ETHZurich (Switzerland) Gazi Universities (Turkey) John Adams Institute/RHUL (UK) JINR (Russia) Karlsruhe University (Germany) KEK (Japan) LAL / Orsay (France) LAPP / ESIA (France) NCP (Pakistan) North-West. Univ. Illinois (USA) Patras University (Greece)

4. 12 GHz Stand alone Test-stand X4 Test Beam Line XB-10 1st December 2010TBTS Status- Wilfrid Farabolini4 The CLIC Test Facility (CTF3)

5. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini5 CLICCTF3 Drive Beam energy2.4 GeV150 MeV compression / frequency multiplication 24 (Delay Loop + 2 Combiner Rings) 8 (Delay Loop + 1 Combiner Ring) Drive Beam current4.2 A*24  101 A3.5 A*8  28 A RF Frequency1 GHz3 GHz train length in linac 139  s1.5  s energy extraction90 %~ 50 % Overall premises length48.3 km150 m The CLIC /CTF3 comparison From CERN map CTF3 view from car park

6. The Drive Beam XB-10 1st December 2010TBTS Status- Wilfrid Farabolini6 Phase coding 180  phase switch Acceleration 0 Sub-harmonic bunching 0 / 2 Thermo-ionic gun Prebuncher and buncher for phase coding (TWT powered) 8 klystrons with pulse compressors (either SLED or BOC) 16 fully loaded accelerating structures 2 chicanes most of RF power (≥ 95%) to the beam Transient Steady state E time

7. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini7 The Delay Loop 42 m long circumference (140 ns) adjustable by wriggler A single deflecting cavity for injecting and extracting bunches

8. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini8 The Combiner Ring 3 rd o /4 4 rd 2 nd injection line septum local inner orbits 1 st deflector 2 nd deflector 1 st turn o RF deflector field 84 m long circumference again adjustable with a wriggler Two deflecting cavities for injecting bunches A fast extraction kicker to empty the loop (delay required)

9. CR Bunch interleaving result XB-10 1st December 2010TBTS Status- Wilfrid Farabolini9 333 ps time 83 ps from Linac in DL after DL in CR Currents measured by BPMs time Streak camera pictures 3 rd turn 4 th turn

10. Drive beam operational flexibility XB-10 1st December 2010TBTS Status- Wilfrid Farabolini10 NOTE: 1.PETS length 1 m (0.215 m in CLIC) 2.To adjust the pulse length, a tail clipper (TC) is installed between CR and TBTS. 3.Upgrade possible to nominal 150 MeV at 5 Hz repetition rate. Mode#1#2#3 Energy110 (3) [MeV] Energy spread2[%] Current (1) 30154[A] Pulse length (2) 1402401100[ns] DBA frequency1.533[GHz] Bunch frequency12 3[GHz] Repetition rate0.8 (3) [Hz] PETS power200615[MW] 30A 15 A 4 A DBA CR DL TBTS CLEX CTF3 CTF2 #1 #2 #3 TC

11. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini11 The Probe Beam (CALIFES) CALIFES Layout CALIFES in the CLEX A standing-wave photo-injector 3 travelling-wave structures, the first one used in velocity bunching A single klystron (45 MW – 5.5  s) with BOC compression (120 MW – 1.3  s) A RF network with splitters, phase shifters, attenuator, circulator and couplers A complete set of diagnostics:  a beam charge monitor,  6 re-entrant cavity BPMs,  3 beam profile monitors,  a deflecting cavity for bunch length measurement,  a triplet for quad scan,  a spectrometer line 3GHz power phase shifter Power levels

12. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini12 Probe beam characteristics ParametersSpecifiedTested Energy200 MeV185 MeV Norm. rms emittance < 20  mm.mrad8  mm.mrad Energy spread< ± 2 % ± 0.5 % Bunch charge0.6 nC0.65 nC Bunch spacing0.667 ns Number of bunches1-32-226from 1 to 300 rms. bunch length< 0.75 ps1.4 ps Very versatile beam characteristics

13. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini13 The Two-Beam Test Stand A complex 12 GHz RF network : Power recirculation in the PETS Two variable splitters and one variable phase shifter 5 bidirectional couplers Probe and drive beam lines PETS and ACS tanks

14. RF Power production XB-10 1st December 2010TBTS Status- Wilfrid Farabolini14 Parameters constant during normal operation→ predicts PETS output power Accurate parameter fit rising slope → gives recirculation loop loss factor and phase shift Energy difference (ε) measurement and model indicates ”pulse shortening” → breakdown indicator measured = model Beam current g = 0.84, φ = -9° measured model g = 0.84, φ = -5° Long DB pulseShort DB pulse RF recirculation loop

15. 15 Two-Beam Test Stand instrumentation 10 BPMs 1 Flash Box 1 PMT 4 beam profile monitors 2 spectrometer lines 4 quadrupole triplets 10 Vert. & Hor. correctors Dipole, profile monitor and quadrupole 1 Faraday cup Faraday cup and correctors Flash Box

16. BPM resolution and kick measurement XB-10 1st December 2010TBTS Status- Wilfrid Farabolini16 Three out of four BPMs used to calculate the expected position in the fourth one. The width of the distribution of expected position – measured position is assumed as the BPM resolution (presently between 45 and 70  m, 10  m foreseen) High resolution BPMs are essential for beam kick measurement during breakdown BPM Courtesy A. Palaia Histograms of the differences (predicted – measured)

17. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini17 First results from TBTS 1/3 17 1/ Power production monitoring PETS output Recirculation loop output ACS input ACS output (64 ns filling time) Power levels are now consistent but the calibration of the 12 GHz measure chains has been difficult. RF power production is also to be consistent with Drive Beam energy loss. Courtesy A. Dubrowski

18. First results from TBTS 2/3 XB-10 1st December 2010TBTS Status- Wilfrid Farabolini18 2/ Energy gain in ACS 100 MV/m (20 MeV gain on the 20 cm ACS) almost obtained but with a much higher RF power than nominal (under investigation). ACS powered ACS unpowered Vacuum activity and synoptic Power vs. energy gain Temperature tuning ?

19. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini19 First results from TBTS 3/3 Energy gain and energy spread vs. phase 3/ Probe beam/RF pulse time and phase scan Probe beam pulse time scan vs. RF pulse

20. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini20 Bunch length measurement with ACS The 12 GHz accelerating structure can be used to measure the bunch length, even more efficiently than with the 3 GHz deflecting cavity. Measures done for various phases of the probe beam buncher give pulse length scaling from 1.46 ps to 5.6 ps. zero crossing: no energy variation But energy spread increase ACS 12GHz power OFF ACS 12GHz ON at zero crossing

21. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini21 Cameras degradation due to radiations Camera close to the dump at the installation The same camera after 2 months Despite the thick lead shield (5 to 10 cm), cameras close to the TBTS dumps have suffered from radiations: high noise on CA.MTV0790 and no more signal from the CM.MTV0590. But the degradation is now stabilized, so it probably happened during a severe drive beam loss operation. Pattern included in the screen 0.2 mm 0.1 mm MTV0790 showing the lead shielding and the LED lighting

22. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini22 Easy to use command/control User friendly control panels (Martin Nybo EN / ICE)

23. 23 Structures Test Program Drive Beam Area –Installed: TBTS PETS, 1m long external RF power recirculation –Next test foreseen: PETS On/Off option (active reflector) A. Cappelletti Probe Beam Area –Installed: TD24 = disks, tapered, damped, 24 cells A. Samoshkin –Next test foreseen: TD24 with wakefield monitor F. Peauger Courtesy A. Samoshkin Courtesy A. Cappelletti

24. Next structures TD24 with WFM XB-10 1st December 2010TBTS Status- Wilfrid Farabolini24 Courtesy F. Peauger & A. Solodko F. Peauger talk: TU04 2 structures fitted with WFM in the tank. 16 signals to be collected, transported by WG and processed in the electronic gallery. Required for beam based alignment

25. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini25 CLIC Modules Courtesy A. Solodko W. Wuench talk: WE03 G. Riddone talk: TH07 Courtesy G. Riddone & A. Samoshkin 3 types of full CLIC modules to be installed in the TBTS

26. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini26 The Instrumentation Test Beam project 8 m 1.0 m CLIC Module footprint 1.45 x 2.1 m 2.0 m Beam dump to be removed CLIC Module transport 2.0 m 1.0 m 8.0 m 0.7 m 0.43 m 35 deg 20 deg First step: record the potential users for this line with their requirements in terms of performances and ancillaries. Not necessary the actual CALIFES performances: thanks to the chicane pulse length as short as 20  m could be obtained

27. XB-10 1st December 2010TBTS Status- Wilfrid Farabolini27 Conclusions Versatile facility two-beam operation –28A drive beam [100A at CLIC] –1A probe beam [like CLIC ] excellent beam diagnostics, long lever arms easy access & flexibility for future upgrades Unique test possibilities power production in prototype CLIC PETS two-beam acceleration and full CLIC module studies of –beam kick & RF breakdown –beam dynamics effects –beam-based alignment Many thanks to the CTF3 colleagues for their support in preparing this presentation. And for your attention…