HOM damper and coupler 孟繁博、郑洪娟.

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Presentation transcript:

HOM damper and coupler 孟繁博、郑洪娟

Design requirement Beam stability: HOM Qe~104 HOM power: Cut off TE11：1126MHz Cut off TM01：1471MHz Beam stability: HOM Qe~104 HOM power: If beam spectrum coincide with HOM, the requirement for Qe should less than 103. (For TM011, if resonance happen, Pt=300W (Qe=103)) Maximum power: 1 kW Dangerous monopole: aroud1200MHz Dangerous dipole: 800MHz~900MHz, 1200MHz

Useful field mode in beam pipe TE11 TM01 Cutoff frequency (GHz) Rpipe (mm) TE11 TM01 78 1.126 1.47 90 0.9757 1.274 100 0.8782 1.148 110 0.7986 1.043 E field E field H field H field

Frequency band division for damper and coupler 1) 800MHz~900MHz: dipole only 2) ≈1200MHz: monopole (TM011?), dipole TM011 can be coupled by TM01 mode in pipe. TE11 mode is useless for TM011. Solution 1: Use coupler for both frequency band, 800~900MHz and 1200MHz. Rpipe should be larger than 100mm, to couple the TM011. Good: small pipe (78mm) Bad: hard to design coupler covering two band Solution 2: Use coupler for 800~900MHz, and damper for 1200MHz Good: coupler focus on one band, easy to design Bad: large pipe Maybe better

Next step for damper Decide the diameter of beam pipe, with the cavity group Calculate the Qe of pipe for the TM011, and the other dangerous mode Simulation with ferrite on the pipe, to get the Ql of the cavity &pipe system ……

TLM & Matrix methods for coupler design HOM coupler part written by 洪娟 TLM & Matrix methods for coupler design To design the coupler from equivalent circuit concept. Then transform to transmission line models (TLM). To simplify the HOM coupler design by ABCD matrix.

Matrix methods for coupler design (W. Xu) Atotal[1,2]/Z0+Atotal[2,1]Z0 S21式用于输入和输出端口的特性阻抗相等的情况。(right?) [1] W. XU. HOM coupler design for High current SRF cavities. 2010.10.11 [2] David M. Pozar. Microwave Engineering, Publishing House of Electronics Industry, Beijing. p160

RF Characteristics-Design Progress The values for the untuned transmission line equivalent circuits are: Ct=2.69pF, Lt=33.76nH, Ln=15.94nH, Cn=3.76pF, L2=9.08nH, C2=0.85pF, M23=7.45nH, C3=1.37pF, L3=19.01nH, Zt=112 Ω, Z=50 Ω LHC broadband coupler

RF Characteristics-Design Progress Optimization need to be done Fundamental mode rejection Extraction of higher order mode passband. …… 3D model Numerical simulation Practical adjustment