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Cavity Test Results : TB9AES002 & TB9NR002

Cavity Test Results : TB9AES002 & TB9NR002. TB9AES002 (aka AES002) : dressed cavity that received light EP, after limited in 3 vertical tests to 20MV/m (hard quench) TB9NR002 : first cavity fabricated by Niowave / Roarke to be processed/tested.

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Cavity Test Results : TB9AES002 & TB9NR002

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  1. Cavity Test Results : TB9AES002 & TB9NR002 TB9AES002 (aka AES002) : dressed cavity that received light EP, after limited in 3 vertical tests to 20MV/m (hard quench)TB9NR002 : first cavity fabricated by Niowave/Roarke to be processed/tested Cavity Mtg. 11/10/2010 J. Ozelis

  2. Early FE onset (9 MV/m), processed away. FE returned at 18MV/m. Limited by FE-induced quench at 27.3MV/m. LF Q0 1.9 x 1010 (“hump”), strong Q0 drop due to FE loading at 20MV/m. Improvement from previous 19.8MV/m (hard) quench limit, but FE much worse, and overall Q0 is lower (LF and HF).

  3. First N/R cavity to be tested. Full processing at FNAL/ANL. Quench limited to 28.5 MV/m (with Q0 there 1.2 x 1010). Also good LF Q0 (2.1 x 1010), no FE. At 1.8K, Q0 improves by 30-40% (typical).

  4. Mode meas & OST data indicate cell #2 as limiting cell. Others do better : 30– 43MV/m. Recent re-tests w/ thermometry and optimized placement of OST’s indicate cells 1 and 2 are limiting performance at the 28-29 MV/m level.

  5. Residual surface resistance ~7nW.

  6. Some observations about TB9NR002 quenches : • At 2.0K… • In the p-mode, see an obvious quench signal on cell#1, sensor #5, at 2.0K, 28.5 MV/m • In the 8p/9 mode (cells 1/9), again see quench signal on cell#1, sensor #5, at 2.0K (as expected), 29.3 MV/m. • In the 3p/9 mode (cells 2/8) see quench signal on cell #2, sensor #5 (same azimuthal position as quench in cell #1) at 27MV/m. • In the 2p/9 mode (cells 3/7) see quench on cell #2, sensor #5 again. Cell 3/7 field is ~39MV/m at this point, cell 2 field is? (27-28 MV/m based on 3p/9 data).

  7. Now at 1.8K(-ish)… • In the p-mode (quenching at same field ~ 29MV/m, 1.81K), see only general RF heating on cells 1 &2, OST’s seem to indicate quench location is ~0.5m above (cells 8 or 9 ?). • In the 3p/9 mode (cells 2/8) see a quench in cell #2, sensor #5 (as at 2.0K), at ~27-29 MV/m, 1.77K. • Going up to 1.85-1.86K, again in p-mode see quench signal in cell #1, sensor #5, at the nominal 28MV/m field level. • Summary : • Quench locations in cells 1, 2, and 8(9), at field levels of 27-29 MV/m. • Some temperature dependence of quench location observed. • Quenches in cells 1 & 2 appear to be along same azimuthal position.

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