1. Tomoyuki Sanuki, Daisuke Okamoto, Yosuke Honda, Toshiaki Tauchi TB&SGC meeting

2. contents Introduction Principle Design(prototype) Performance(prototype) Purpose Test place Time schedule Conclusion

3. introduction We have studied tilt monitor as the new type of the cavity beam monitor θ Measure θ with high precision Beam line Tilted beam Tilt monitor is useful because of its “single cavity measurement” I proposed “the tilt monitor at IP” 9th June, in project meeting Of course there are some issues to solve. detailed location, dynamic range ~ 200urad I will continue the study of the tilt monitor. We need the real test with actual monitor “prototype”

4. Principle-Resonant mode Tilt monitor uses monopole mode. Monopole mode is perpendicular to nominal beam axis excited no excited Nominal beamTilted beam Ｕ (excited energy) ∝ θ 2 (including time transit factor) E-field H-field Beam pipe Cavity weak strong

5. How to extract the signal The magnetic field of monopole mode is extracted through slit, and transmitted by TE mode. TE mode signal is couple to the coaxial antenna. V(extracted signal) ∝ θ E-field H-field waveguide antenna TE mode slit

6. Design Sensor cavity width length width[mm] length[mm] 1-degree Excited energy[J] Width : length=1:1.1 is almost best set The resonant frequency 2.856GHz We designed Sensor cavity as the excited energy was larger. 77.4mm 70.4mm

7. Design – waveguide+ antenna TE signal antenna Reflection amplitude At 2.856Ghz Reflection amplitude is zero We designed waveguide + antenna as the TE mode signal was coupled antenna

8. Total structure frequency2.856GHz τ(power)150nsec τ(amplitude)300nsec Qloaded3470 Β(Qwall/Qext)3.45 Sensor cavity size Width77.4mm length70.4mm height30mm pipe radius10mm

9. Performance Evaluating the extracted power Thermal noise The limitation : about 35nrad Orbit angle[urad] Determined by temperature(T) and bandwidth(Δf) Room temperature 300[K] Bandwidth ～ 3MHz P TN =1.24×10 -14 [W] Output power[W] ∝ θ ２ P TN = K B TΔf Thermal noise

10. Short Summary Prototype of the tilt monitor has the expected sensitivity 35nrad I think I will use as complemental device of the IP-BPM Of course, there is some issue to solve, the detailed location,dynamic range Tilt monitor is the new technique of cavity beam monitor. We have to confirm the basic property. First experiment using prototype model the sensitivity 35nrad is equal to about 2.5nm for distance 7-8cm

11. About Experiment

12. purpose We will confirm the property of the extracted signal which the amplitude depends on only beam tilt V0 ∝ θ In first test, we will measure the amplitude of signal for some micro radians with using attenuator for calibration. 1.2e+4 8e+3 4e+3 0 -4-2240 V0[volt] θ[urad] 3e-9 2e-9 1e-9 -1e-9 -2e-9 -3e-9 0 04e-7 8e-7 1.2e-6 Time [s] V[volt] 2τ V0

13. Test place We will use the space reserved for IP BPM test area We think we can steer the vertical beam tilt with steering magnet ZV11X and ZV10X If we can take some occupancy shifts Not occupancy shift We will measure the signal for mechanical moving as there will be no influence for another shift.

14. Time schedule 2009 design drawingProductionCold test 6 7 8 9 10 11 12 1 ~ 2010 1 st test Future We will test the basic relation of amplitude of the signal and beam orbit for some urad beam tilt. I would like to do this first test in November ~December. There is a Personal reason for writing master thesis.. One shift per week times 4 ： thus 4shifts

15. Manpower available Daisuke Okamoto, Tomoyuki Sanuki from Tohoku Univ. Yosuke Honda at KEK are main workers. Others Toshiaki Tauchi Toshikazu Takatomi (engineer @ KEK) High energy physics group in Tohoku Univ.(Hitoshi Yamamoto et al.) Expected KEK workloads Work for installing : cabling, vacuum chamber, alignment Beam parameter Single bunch run Charge : a harf of 1.6 nC or a third of 1.6nC

16. Conclusion We would like to confirm the property of the extracted signal In the prototype of tilt monitor. I’m preparing the engineering drawing with contacting Takatomi-san The prototype will be preparing until 10 or 11. After cold test, we would like to install at the test place and test As the future we will aim the sensitivity 35nrad with prototype.