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The ILCTA_MDB Horizontal Test Stand for SRF Cavities

The ILCTA_MDB Horizontal Test Stand for SRF Cavities. Andy Hocker FNAL-TD AEM, 25-JUN-2007. Horizontal Testing --- Context. Fail!. Cavity Fabrication. Surface Processing. Vertical Testing. Fail!. Pass!. Horizontal Testing. Surface Processing. Cavity Dressing. Pass!.

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The ILCTA_MDB Horizontal Test Stand for SRF Cavities

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  1. The ILCTA_MDB Horizontal Test Stand for SRF Cavities Andy Hocker FNAL-TD AEM, 25-JUN-2007

  2. Horizontal Testing --- Context Fail! Cavity Fabrication Surface Processing Vertical Testing Fail! Pass! Horizontal Testing Surface Processing Cavity Dressing Pass! Cold String Assembly AEM

  3. MDB: Lay of the Land Horizontal test area for ILC RF Hut Vertical Test area for HINS AEM

  4. HTS Cave and RF Hut WG switch charging supply 300 kW klystron modulator RF waveguide (1.3 and 3.9 GHz) LHe/LN2 feed can Horizontal Test Cryostat (HTC) High power pulsed RF system (operated w/ CC2 for > 1 yr) AEM

  5. Typical HTS test cycle • Install cavity in HTC • Warm, off-resonance coupler conditioning (high pulsed power processing) • Cooldown to 1.8 K • On-resonance conditioning of coupler/cavity • Map out Q0 vs Eacc curve • Test new widgets, etc. • Warmup • Remove cavity • Goal: ~10 day turnaround Geophones (ILC CM vibration R&D) AEM

  6. C22 prep (“dressing”) Cavity tuner installation Installation of cold part of input coupler at CAF-MP9 clean room Ready to install in HTC Installation of warm part of input coupler AEM

  7. First measurement at HTS • Room-temperature measurement of fundamental passband modes • Zoom of “pi-mode” (accelerating mode) AEM

  8. Status and plans • Struggling with cavity cooldown • Identified a leaky liquid level probe as culprit, repairing this week, go for cooldown again • Finishing up RF distribution/interlock checkout • Installing WG shutters to allow for multi-cave (HTS and CC2) configuration • Finishing up safety paperwork, final walk-through soon • After RF checkout, begin commissioning • Execute HTS test cycle (~1 month) • Declare open for business • First customer: FNAL third-harmonic (3.9 GHz) cavity for DESY’s FLASH facility • 1.3 GHz cavities for first US-built ILC CM as schedule allows AEM

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