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Status of CLIC BPM design and tests

Status of CLIC BPM design and tests. Design status for DB and MB Tests in CLEX Status of BPMs for test modules Outlook. On behalf of: Alfonso Morell , Andrei Lunin , Alexei Luapin , Stewart Bogeert , Thibaut Lefevre Francis Cullinan , Sebastien Vilalte , Manfred Wendt, Jack Towler.

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Status of CLIC BPM design and tests

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  1. Status of CLIC BPM design and tests • Design status for DB and MB • Tests in CLEX • Status of BPMs for test modules • Outlook On behalf of: Alfonso Morell, Andrei Lunin, Alexei Luapin, Stewart Bogeert, ThibautLefevre Francis Cullinan, SebastienVilalte, Manfred Wendt, Jack Towler CLIC Module Working Group

  2. T1 module BPM CLIC Module Working Group

  3. Main beam BPM • Resonant cavity beam position monitor prototype for CLIC main beam • Low quality factor to provide multiple position measurements within a single train • Made from four stainless steel parts successfully brazed together in April • RF characterization before and after brazing: Temperature stability of both cavities measured CLIC Module Working Group

  4. MB BPM beam tests • Pick-up to be installed at the end of the CTF3 probe beam line in January 2013. • Horizontal and vertical mover stages for sensitivity measurement and calibration • OTR screen to ensure good beam transmission • Schottky diode detectors for initial measurements • Electronics designed for beam test of single BPM CLIC Module Working Group

  5. Main beam BPM Design of acquisition electronics with commercial ADC is ongoing and will be installed in CLEX in a second test phase. After evaluation of beam tests with one BPM and optimization of the designs, 3 BPMs will be installed in CLEX or ATF2 to measure the achievable resolution <50nm somewhere in 2014. http://ibic12.kek.jp/prepress/papers/mopa18.pdf CLIC Module Working Group

  6. Drive beam BPM • Compact model, fits into the quadrupole vacuum chamber. • Length L chosen for transfer function to have zeros at 12 GHz (bunch cancellation in the middle of the train). • SiC damping ring added to absorb trapped modes at 12 GHz and above. Frequency response not as expected Working around 20MHz Incident Reflected CLIC Module Working Group

  7. 450 Strip line BPM: Rough approximation of the original Slide from M. Wendt • Due to the fact that the transverse dimensions are comparable to the longitudinal ones, fields are not strictly TEM. CLIC Module Working Group

  8. 100Stripline BPM: Slide from M. Wendt CLIC Module Working Group

  9. 100 Small Strip line BPM: Slide from M. Wendt CLIC Module Working Group

  10. 450 Strip line BPM: Digital attenuator T-bridge filter 4MHz, 1st order ADC T-bridge filter 20MHz, 1st order Diplexer 35MHz, 2nd order BPM G SE to Diff Signal from present 45 deg. design   LAPP electronics http://ibic12.kek.jp/prepress/papers/mopa16.pdf CLIC Module Working Group

  11. Drive beam BPM beam tests Girder 8 8 channels, Fs=96Msps (CTF3 clock). Lapp electronics to be used in this beam test. CLIC Module Working Group

  12. Status of BPMs for Lab. modules • 4 DB Strip line Mock-ups manufactured for the two TM0 lab-modules. • 4 DB BPS manufactured by IFIC are at CERN for the TM1, TM4 lab modules. • 1 TM1 MB cavity BPM + vacuum chamber Mock-up has been manufactured. • TM4 MB BPM mock-up design not started yet! BPS DB strip line Mock-up TM1, 4 TM0 MB Cavity BPM Mock-up TM1 CLIC Module Working Group

  13. Status of BPMs for modules 4 DB Stripline mock-ups delivered TM4? 4 DB BPS delivered + 1 MB TM1 Vacuum assembly • Tests in CLEX To be decided by BI before Christmas! CLIC Module Working Group

  14. Summary and outlook • DB BPM • The DB strip line BPM works well as an RF PU, but does not suppress the 12GHz signals as foreseen in the 450 design, and have spurious resonances below 12 GHz. • Signals from a 100 strip line BPM in a 11 mm diameter beam pipe demonstrate the concept. • Beam tests will go ahead in CLEX for completeness, using external filtering. • New designs will have to be evaluated such as, buttons, coaxial BPM… CLIC Module Working Group

  15. Summary and outlook • MB BPM • The MB cavity BPM has been thoroughly evaluated in laboratory and looks promising. • Beam tests will be made in Califes beginning 2013. • After optimization of the design resolution measurements tests will be done in either CLEX or ATF3. • Test modules • For lab modules a design of a TM4 MB BPM + chamber must be started. • For the CLEX TMO nor yet clear for BI what to install as DB BPM. Decision before Christmas. CLIC Module Working Group

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