Acfa-LC7 FEATHER FEATHER: Feedback AT High Energy Requirements Tauchi Toshiaki,Hayano Hitoshi, Nicolas Delerue,Fujimoto Hiroyuki <Contents of this presentation> 7 electrical circuit 1 contents 2 purpose 9 LPF 3,4,5 estimation 10,11 BPM signal 12 schedule 6 kicker & BPM Fujimoto Hiroyuki: 1 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Purpose of the FEATHER The purpose of the FEATHER is getting the high luminosity at the very high energy liner collider to use the feedback loop. We use the signal of the BPM(@1) and convert that signal (@2), put that signal into the kicker (@3). So, at first, beam go through , after using the FEATHER system, beam go through . We can get the lower vertical offset(@4). e- @1 BPM e+ @4 Hybrid & other component @2 Inter action point kicker @3 Fujimoto Hiroyuki: 2 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Lay out of the extraction line (ATF at KEK) Feedback beam BPM kicker ● We uses the button BPM and the stripline kicker . ● The kicker & the BPM have the movable electrodes. We can adjust both gaps. Because we want to raise the accuracy by “movable”.) ● We put the stepping motor in the kicker & the BPM, so we can do good calibration for BPM. Fujimoto Hiroyuki: 3 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Easy timing estimation ● There is ~1.5 meter between our kicker and our BPM So, Beam flight 5ns Cable delay 7.5ns ● The response time of our amplifier has been measured 5.6ns ● Various electronics delay should be less than ?ns (Total ~(18.1+?)ns) ATF (at KEK): ● 20 bunches at ~2.8ns make a ~56ns train. So, Should be possible to test ! Fujimoto Hiroyuki: 4 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Calculation of the effect of the kick q × V × distance kick effect of the E = mc 2 × gamma × gap a q × V × distance × length × u × b da ∫ kick effect of the B = 1.5 2 × pi × mc × gamma × R a b 0 We want to use the 357MHz pulse, if possible. The signal voltage in the electrode of the kicker Voltage time is not only positive, but also negative. So, when we use our electrode of the kicker, Total kick effect = effect of the E B × 0.67 Fujimoto Hiroyuki: 5 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER The new kicker & the new BPM We want to adjust the position of the electrodes. Accuracy is 10 um for kicker &1um for BPM because of the kicker estimation. So we introduced BPM the stepping motor & the gauge. gauge(for finding the electrode) Motor (for moving the electrodes) Fujimoto Hiroyuki: 6 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Electrical circuit This is electrical circuit of LPF(550MHz) BPM(up) FEATHER. Hybrid We are doing the BPM(down) preparation about LPF(550MHz) after the Hybrid. AMP Phase Sifter Programmable Attenuator Kicker(upstream) Kicker(downstream) Fujimoto Hiroyuki: 7 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER The position accuracy of the kicker & the BPM Goal gauge diff. upstream from downstream Kicker : 10um 2um 100um <- don't need to think BPM : 1 um 1um Fujimoto Hiroyuki: 8 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER The LPF performance LPF (Frequency VS Attenation) PNA Series Network Analyzer (E8363B) 9.00E-01 0.5 8.00E-01 0.45 7.00E-01 0.4 0.35 6.00E-01 V[V} ag 0.3 5.00E-01 Lin M 0.25 4.00E-01 0.2 3.00E-01 0.15 2.00E-01 0.1 1.00E-01 0.05 0.00E+00 0 4.00E+08 5.00E+08 6.00E+08 7.00E+08 8.00E+08 400000000 500000000 600000000 700000000 800000000 Frequency (Hz) Frequency[Hz] Measurement Simulation (spice) ( network analyzer) For simulation, I used the model of chevishef-type LPF and I compare with our LPF (at 550MHz). So, we can calculate the signal shapes with spice program after the circuit of this components. Fujimoto Hiroyuki: 9 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Single-bunch BPM signal (simulation) 10ns 10ns BPM signal BPM signal (raw) (after the LPF (550MHz)) This is the consequence of the “SPICE” simulation. One is the raw signal, the other is the signal after the LPF. Fujimoto Hiroyuki: 10 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Single-bunch BPM signal (experiment) 20ns 20ns Maybe, in case of with LPF, the signal is like the simulation. But ,in case of raw signal, the signal is not like the simulation. Maybe, raw signal is very fast, so we can't use easily. Fujimoto Hiroyuki: 11 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Electrical circuit Acfa-LC7 FEATHER LPF BPM (550MHz) Hybrid (up) Schedule BPM LPF (550MHz) (down) AMP Kicker ● Calibration of the BPM. (downstream) Phase Sifter ● Test of the hybrid . Kicker Programmable Attenuator (upstream) ● Calibration of the BPM using the hybrid. ● Calibration of the BPM using the hybrid and AMP. ● Kick the signal from signal generator and see the kick effect by the BPM. ● Kick the signal from the BPM and see the kick effect by the BPM. ● Kick the signal from the BPM and see the kick effect by the BPM with movable phase shifter. ● Control with the force of the kick using the programmable attenuator. Fujimoto Hiroyuki: 12 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Presentation have been finished. Please give us many advices and a few questions (with very slow speaking)! I like Taiwan, because the people is very kind and food is very good taste and so on. So I want to come again in my private time! 謝謝 ! Fujimoto Hiroyuki: 13 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Fujimoto Hiroyuki: 14 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
Acfa-LC7 FEATHER Fujimoto Hiroyuki: 15 2004/11/11 fujimoto@hakone.phys.metro-u.ac.jp
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