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BE-KT Innovation Day Octopus Temperature Mapping System for Cavity Diagnostics

The Octopus Temperature Mapping System, showcased at the BE-KT Innovation Day 2012 at CERN, addresses the challenge of cavity diagnostics for quenching in superconducting RF cavities. This presentation outlines its background, the existing mainstream systems, and the innovative features of the Octopus T-map design. With its flexible sensor configuration and enhanced accuracy, this system aims to improve quality control in high-accelerating gradient cavities. The prototype is anticipated for testing by July, paving the way for significant advancements in cavity temperature mapping.

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BE-KT Innovation Day Octopus Temperature Mapping System for Cavity Diagnostics

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  1. 3 June 2012 BE-KT Innovation Day Prevessin, CERN, Switzerland BE-KT Innovation DayOctopus Temperature Mapping System for Cavity Diagnostics Kitty Liao BE-RF-SRF Kitty.Liao@cern.ch

  2. Background Mainstream systems The Octopus T-map Outlook & Summary Presentation Structure • Background : Cavity diagnostics for quench • Mainstream (Existing) systems • NEW- The Octopus Temp. Mapping system • Outlook & Summary BE-KT innovation day Octopus Temperature Mapping System

  3. Background Mainstream systems The Octopus T-map Outlook & Summary Temperature mapping background H Superfluid He (2 K) • Goal - achieve high accelerating gradient 704 MHz cavities for the SPL @ CERN (244 x 5-cell β =0.6 & β =1 cavities) - quality control • Limitation - cavity quench: at a defective (quench spot) - thermal breakdown • Solution - the first system: in CERN (1981) for 500 MHz LEP cavities - 120 Ω , ¼ W Allen-Bradley carbon resistors , rotating motor Niobium bulk Tc =9.2 K source: Ph. BERNARD, Nuclear Instruments and Methods 190 (1981), ‘Temperature Mapping on a Superconducting RF Cavity in Subcooled Helium by H. Piel& R. Romijn, CERN/EF/RF 80-2 (1980) BE-KT innovation day Octopus Temperature Mapping System source: G. Ciovati, et al.,” Temperature mapping system for single cell cavities”, Fermilab, internal report (2005)

  4. Background Mainstream systems The Octopus T-map Outlook & Summary Mainstream systems source: D. Reschke et al., THP016, LINAC08 source: J. Knobloch et. al, Rev. Scientific Instru. 65 (11) source: T. Tajima, LA-UR-09-02723, PAC09 β↑ β↓ BE-KT innovation day Octopus Temperature Mapping System

  5. Octopus Temperature Mapping SystemDesign Concept & Features • For SPL type cavities (=0.6, =1) • Octopus inspired • Flexibility, time saving  good contact and use on different beta cavities • Allen-bradley sensor package (100 Ω, 1/8W, raw resistor ΔR/ΔT≈ 758 Ω/K)  75.8Ω/100 mK • Fixed sensor pattern more accurate • Multiplexer IC on printed circuit board  reduce cross talk BE-KT innovation day Octopus Temperature Mapping System

  6. Background Mainstream systems The Octopus T-map Outlook & Summary Octopus Temperature Mapping SystemPrototype • 1/3 Octopus flexible polymide (Kapton) PCB - sensor res. 20 (equator) ~ 34 mm - pre carved space for second sound travel - multiplexers IC H. Piel & R. Romijn, CERN/EF/RF 80-2 (1980) • Allen-Bradley sensor package • - dedicated glass fiber holder • - concealed manganin wires in stycast • - stable pins on the sides • - ~3000 (5 cell) BE-KT innovation day Octopus Temperature Mapping System

  7. Background Mainstream systems The Octopus T-map Outlook & Summary Octopus Temperature Mapping SystemPrototype • Acquisition board outside the cryostat • - calibration (at 4 K and 2 K) • - measure resistance, process data • - send to PC, show map • - post process (real time) to see quench development PC Temp maps 12 ribbon cables for a single cell BE-KT innovation day Octopus Temperature Mapping System

  8. Background Mainstream systems The Octopus T-map Outlook & Summary Outlook & Summary • Temperature mapping system is essential for quench localisation & understanding cavity performance. • The octopus Tmap is designed with features to solve problems with shape difference and with better performance – now at the prototyping stage. • The first 1/3 prototype hoped to be tested by end of July. • Further adjustment and modification for full 5 cell SPL structure/ LHC cavities/ Crab cavities • Possibilities outside CERN in HEP: replacement for old style non-flexible temperature mapping systems? • Man-power needed and manufactures for making the sensors! The needs you! Stephane Rey BE-RF (microprocessor programme and circuits) and me (end of July)! BE-KT innovation day Octopus Temperature Mapping System

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