PEDM Review 12/7/091 Beam Position Monitors William Morse.

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Presentation transcript:

PEDM Review 12/7/091 Beam Position Monitors William Morse

PEDM Review 12/7/092 BPM Resolution Requirements Resolution requirements for averaged beam vertical position CW vs. CCW:  10  m (10 6 Hz) per BPM.  10nm (1Hz) per BPM.  10pm (10 -6 Hz) per BPM. With 64 BPMs for 10 7 s,  1pm. The above is for magnetic focusing. For electric focusing, we need 10  better.

PEDM Review 12/7/093 Strip-line BPM Cartoon for Relativistic Bunch for Non-experts

PEDM Review 12/7/094 Strip-line BPM Cartoon for Relativistic Bunch

PEDM Review 12/7/095 Strip-line BPM resolution from Peter Cameron’s June C-AD Review Talk The average power available in the signals from each of the four lines is about -25dBm at the feedthrus. Conservatively estimating losses of 28dB, the signal power available after digitization will be approximately - 53dBm. The resulting signal-to-noise ratio, given the thermal noise floor of -173dBm/Hz, will be ~120dB in a 1 Hz bandwidth. With the 10mm half aperture, the resolution in the 1 Hz bandwidth will be 10nm. BPM electronics that will provide this measurement resolution are commercially available.

PEDM Review 12/7/096 Issues Strip-line BPMs have the resolution, but Beam impedance Re(Z L )  25 . 64  25  = 2.4K . This is a lot compared to other stuff, like the E plates, etc., and is a spin systematic. Requirement for the whole ring is <10K . Also, strip-line systematic errors are challenging at the 1pm level: x = V R - V L

PEDM Review 12/7/097 Resonant Cavity BPMs

PEDM Review 12/7/098 Dipole TM 110 Mode First order: (Iy) CW - (Iy) CCW Monopole mode TM 010 measures (I CW -I CCW ). Need several of these. If y CW = y CCW = y, then Second order: (I CW - I CCW ) y. With only one beam measure y, and zero with feedback, i.e. center beam in cavity. S/N is better than stripline BPM because cavity has Q  5  10 3, i.e. signal is at one f with narrow  f.

PEDM Review 12/7/099 Cavity Beam Impedance Re (Z L ) is zero to first order in monopole mode, i.e., zero if (I CW -I CCW ) = 0. Zero to second order in dipole mode, i.e., zero if (I CW - I CCW ) y = 0. Re(Z L ) <<10K .

PEDM Review 12/7/0910 Dipole Mode Cavity Design Working with Mike Blaskiewicz et al. Preliminary: 2.5GHz TM 110 mode. R/Q = 18  for 1cm offset. Q  cm(V)  12.8cm(H)  5cm(L). RF is 0.1GHz with 2.5GHz modulation.

PEDM Review 12/7/0911 Two Cells using dipole mode f = 2.5 GHz R/Q = 18  for y=1cm Q = 15,000 for Cu Take Q=5000 Drive at exact multiple of freq

PEDM Review 12/7/0912 Are We the Only People Trying for Nanometer Precision? Y. Inoue et al., Phys. Rev. ST – Acc. and Beams 11, (2008). ILC R&D at KEK ATF. Achieved  9nm precision over a dynamic range of 5  m with 6GHZ Dipole Resonant Cavity for each 7  10 9 electron bunch. This is best resolution achieved yet. Their goal is 1nm. Our requirement:  10nm for  y for 10 6 turns of 2   =0.6 protons. Light Source 2 also needs nm precision. We benefit from their efforts, even though we can’t just use their designs.

PEDM Review 12/7/0913 Sensitivity/Systematics Add B R sin(  BR t) and E v sin(  EV t)  1Hz frequency. This moves the CW/CCW beams in the same or opposite directions. Set to  10nm during setup, for example. Set to  10pm during physics running, for example. See effect in both the BPM and spin signals.

PEDM Review 12/7/0914 Peter’s Level of Effort Estimate 0.5FTE during detailed design, 1 FTE during construction and commissioning. Total $0.45M. Peter didn’t give us plan, milestones, etc., before he had heart attack last month. Low technical risk for magnetic focusing, Higher technical risk for electric focusing.