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Review of ferrites used at CERN to damp HOMs : TE/ ABT equipment

Review of ferrites used at CERN to damp HOMs : TE/ ABT equipment . M.J. Barnes and W. Weterings 05 June 2012. TE/ ABT HOM Damping Ferrites. Beam impedance reduction ferrites ( lossy + low-loss). Beam impedance reduction ferrites ( lossy + low-loss).

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Review of ferrites used at CERN to damp HOMs : TE/ ABT equipment

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  1. Review of ferrites used at CERN to damp HOMs: TE/ABTequipment M.J. Barnes and W. Weterings 05 June 2012

  2. TE/ABTHOM Damping Ferrites Beam impedance reduction ferrites (lossy + low-loss) Beam impedance reduction ferrites (lossy + low-loss) Only HOM damping ferrites in TE/ABT equipment, that we are presently aware of, are in the MKI tank. Damping resistor (now at both ends) Screen conductors capacitively coupled to “ground” Screen conductors soldered to “ground” ground plate HV plate ground plate HV plate ferrite yoke capacitor Kicked Beam Beam impedance reduction ferrites (lossy + low-loss) Beam impedance reduction ferrite (lossy + low-loss) TMR connection entrance box connection M.J. Barnes & W. Weterings

  3. MKI: HOM Damping Ferrites • Each of the two sets of MKIHOM damping ferrites (a.k.a. “beam impedance reduction ferrites”) consists of 9 toroidal cores: 4 or 5 of each of FerroxcubeT87/54/14-4M2 and T87/54/14-4B3 per set. • Treatment - after surface treatment by Marina: • Treatment in air in an oven, ramped at 50°C /hour to 1000°C, plateau of 2 hours, then reduction in temperature at 50°C/hour. • Redo the same treatment but under vacuum. M.J. Barnes & W. Weterings

  4. Other HOM Damping Materials… • The SPS septa and protection elements do not use ferrites to damp HOM’s, but do use a ceramic capacitor with carbon deposit resistors. M.J. Barnes & W. Weterings

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