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CLIC RF Structure Development Meeting - Alexey Dubrovskiy and CTF Team Report

This report covers RF measurements, diode power measurement, drive beam evaluations, IQ measurements, and attenuation analysis from recent CLIC RF structure development meetings led by Alexey Dubrovskiy and the CTF team. The report highlights the progress and findings related to PETS, ACS input and output, probe beams, accumulated BDR, forward beam power, and ACs conditioning. It also discusses the latest news, conclusions, and future plans for system conditioning and BDR measurement.

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CLIC RF Structure Development Meeting - Alexey Dubrovskiy and CTF Team Report

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  1. News from TBTS CLIC RF Structure Development Mtg, Alexey Dubrovskiy and CTF team

  2. RF measurements Diode power measurement Drive beam PETS 12GHz PETS output Loop output CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team ACS input ACS output Probe beam ACS: 12WDSDVG1.8 - RF Diode & IQ measurements The expected attenuation is 77% => <15% RF measurement inconsistency 06.07.11 2

  3. RF measurements and Acceleration Estimated Acceleration from Diodes  Drive beam PETS 12GHz PETS output Loop output ACS output CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team ACS input Estimated Acceleration from IQs Probe beam ACS: 12WDSDVG1.8 - RF Diode & IQ measurements • All Diode and PETS and Loop output IQ signals are consistent with acceleration. 06.07.11 3

  4. Illustration of BDs PETS extracted PETS reflected Attenuated forward Attenuated reflected BD without reflection CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team ACS reflected ACS forward BD in the waveguide ACS transmitted Drive beam current 06.07.11 No BD 4

  5. PETS loop conditioning PETS output peak power PETS Vacuum level  Pulse length at 75% of pp Pulse length at 90% of pp CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team Number of BD Accumulated BDR * BD detection is based on the reflected power 06.07.11 5

  6. PETS attenuator conditioning Expected attenuated power PETS output peak power Pulse length at 75% of pp Pulse length at 90% of pp CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team Accumulated BDR Number of BD * BD detection is based on the missing energy 06.07.11 6

  7. PETS2ACS waveguide conditioning PETS output peak power Pulse length at 75% of pp Pulse length at 90% of pp CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team Accumulated BDR Number of BD * BD detection is based on the missing energy 06.07.11 7

  8. Illustration of BDs PETS extracted PETS reflected Attenuated forward Attenuated reflected BDs in the recirculation loop CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team ACS forward power ACS reflected No BDs in the waveguide ACS transmitted ACS Forward Phase 06.07.11 High reflection from the ACS. Is it a BD in the ACS? 8

  9. ACS conditioning Pulse length at 75% of pp Forward peak power Accumulated BDR Number of BD * BD detection is based on the missing energy CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team Accumulated BDR Number of BD * BD detection is based on the missing energy, pulses with upstream BDs are excluded 06.07.11 9

  10. ACS BD vs Acceleration Forward peak power Measured acceleration CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team 113 MV/m 120 MV/m 127 MV/m 133 MV/m Accumulated BDR 06.07.11 * BD detection is based on the missing energy, pulses with upstream BDs are excluded 105 MV/m 96 MV/m 10

  11. ACS BDR vs Acceleration BDR vs Acceleration CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team 06.07.11 11

  12. The latest news from the last night Successful run over the night with the stable beam conditions CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team 06.07.11 12

  13. Conclusions • The RF measurement has been improved, but not finished yet • The major number of BDs appear nearby the variable attenuator • The BDR in the ACS is in the order of 10-3 at 100MV/m • The TBTS night operation has been successfully established • The future operation will continue the RF system conditioning and DBR measurement. CLIC RF Structure Development Mtg Alexey Dubrovskiy and CTF team 06.07.11 13

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