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  1. BPM overview CLIC Beam instrumentation work shop, CERN, 2nd & 3rd of June 2009, Lars Søby BPM overview Lars Soby

  2. CLIC BPM overview CLIC module Main beam BPM Drive beam BPM FE electronics Outlook BPM overview Lars Soby

  3. Injectors ~3.7* 109 charges per bunch 2GHz bunch spacing Ipulse ~1.5A 50 3 10 10 100 2 4 BPM overview Lars Soby

  4. Pre damping rings Plus a few fast BPMS for instability observations. 2GHz BW, 10µ resolution! ~3.7* 109 charges per bunch 2GHz bunch spacing Ipulse ~1.5A 300 300 BPM overview Lars Soby

  5. Damping rings Plus a few fast BPMS for instability observations. 2GHz BW, 10µ resolution! ~3.7* 109 charges per bunch 2GHz bunch spacing Ipulse ~1.5A 300 300 BPM overview Lars Soby

  6. BC1, Booster Linac, Transfer lines, BC2 12 12 200 400 400 200 10 10 80 OBS: Req. resolution for BC2 is 100µ. 30 30 ~3.7* 109 charges per bunch 2GHz bunch spacing Ipulse ~1.5A BPM overview Lars Soby

  7. DBA, DL’s, CR’s and transfer lines 350 60 60 350 30 30 10 10 ~8.4* 109 charges per bunch 12GHz bunch spacing Ipulse ~100A BPM overview Lars Soby

  8. DB Long transfer lines 424 424 ~8.4* 109 charges per bunch 12GHz bunch spacing Ipulse ~100A BPM overview Lars Soby

  9. DB Turn around’s 960 960 ~8.4* 109 charges per bunch 12GHz bunch spacing Ipulse ~100A BPM overview Lars Soby

  10. DB decelerators + beam dumps 20740 48 20740 48 ~8.4* 109 charges per bunch 12GHz bunch spacing Ipulse ~100A BPM overview Lars Soby

  11. Main beam Linac + BDS 300 300 2088 2088 ~3.7* 109 charges per bunch 2GHz bunch spacing Ipulse ~1.5A BPM overview Lars Soby

  12. BPM summery A total of 52813 BPMs!!...or ~800MCHF BPM overview Lars Soby

  13. CLIC module, Type 1 Wake Field Monitors MB-BPM Main Beam DB-BPM Drive Beam DB-BPM BPM overview Lars Soby

  14. Module types 1 BPM per quadrupole 1WFM per accelerating structure 78 0? 4 5 5 8374 154 634 477 731 In total 10462 modules per Linac BPM overview Lars Soby

  15. Main beam choke BPM Developed by R. Fandos and I. Syrachev’s Coaxial antenna pickup Beam Choke where the TM11 mode is trapped • RF design is made, but mechanical design still needs to be done. See M. Wendts talk. • Better than 50nm resolution with time resolution of 10ns. • Low wake field impedances. Damping material, TM01 BPM overview Lars Soby

  16. Multibunch Resolution Q=100 Res.=200nm Q=1000 Res.=200nm BPM overview Lars Soby 16

  17. Wakefields WT<<13V/pC/mm WL<< <46V/pC BPM overview Lars Soby 17

  18. EUROTeV PBPM 6mm aperture. Measured 600nm resolution with beam in CTF3. BPM overview Lars Soby

  19. Drive beam spectrum HOM Current modulation? Chamber cutoff frequency 7.6GHz!!! HOM from PETS with several kilo Watt’s • Beam pulse power 240GW BPM coupling impedance of -40dB would pump 300W! 40000 BPMs would dissipate 12MW per pulse!! Introduce current modulation at e.g. 2GHz? Measure with button, strip line or inductive BPM at baseband Use other (unknown) spectral lines BPM overview Lars Soby

  20. Front-end electronics in the tunnel LAPP digital FE Designed to resist up to 350GY H=27, L=45, D= 30 cm Analogue FE < 35GY/Y Analogue FE = Down converters, Signal conditioning, Calibration units Digital FE = Digitizers and control BPM overview Lars Soby

  21. Summery • More than 50000 BPMs which implies simple, cost effective and robust designs. • For the main beam BPM a 14GHz low-Q cavity / choke BPM is presently being studied by Fermilab. See M. Wendt’s talk. • Drive beam BPM: • High beam power is a potential problem. • Base band BPM seems best candidate, Button?, Stripline? • Adapt inductive BPM to 100A and 20um accuracy. • FE electronics and data transmission is being studied by LAPP. See S. Vilalte’s talk. • 10um resolution and 2GHz BW BPMs needs attention. All BPM systems needs to be studied and evaluated before end 2010! BPM overview Lars Soby