Testing procedures and results of the prototype fundamental power coupler for the Spallation Neutron Source

Stirbet, M.; Campisi, I.E.; Daly, Edward; Davis, G.; Drury, M.; Kneisel, P.; Myneni, Ganapati Rao; Powers, T.; Schneider, W.; Wilson, Katherine; Yang, Yuan; Cummings, K.; Hardek, T.

doi:10.1109/pac.2001.986601

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…The outer conductors and all the stainless steel components were cleaned by 15 minutes of immersion in an ultrasonic bath filled with a 10% solution of Micro-clean ® detergent, followed by rinsing with de-ionized water (DI) and drying with dustfree antistatic nitrogen gas. The transfer from the cleaning area to the class 100 clean room was done in double plastic bags filled with dry nitrogen [5].…”

Section: Component Cleaning and Clean Room Assemblymentioning

confidence: 99%

RF Conditioning and Testing of Fundamental Power Couplers for SNS Superconducting Cavity Production

Stirbet

Wilson

Wiseman

et al.

Proceedings of the 2005 Particle Accelerator Conference

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The Spallation Neutron Source (SNS) makes use of 33 medium beta (0.61) and 48 high beta (0.81) superconducting cavities. Each cavity is equipped with a fundamental power coupler, which should withstand the full klystron power of 550 kW in full reflection for the duration of an RF pulse of 1.3 msec at 60 Hz repetition rate. Before assembly to a superconducting cavity, the vacuum components of the coupler are submitted to acceptance procedures consisting of preliminary quality assessments, cleaning and clean room assembly, vacuum leak checks and baking under vacuum, followed by conditioning and RF high power testing.Similar acceptance procedures (except clean room assembly and baking) were applied for the airside components of the coupler. All 81 fundamental power couplers for SNS superconducting cavity production have been RF power tested at JLAB Newport News and, beginning in April 2004 at SNS Oak Ridge.This paper gives details of coupler processing and RF high power-assessed performances.

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Section: Component Cleaning and Clean Room Assemblymentioning

confidence: 99%

RF Conditioning and Testing of Fundamental Power Couplers for SNS Superconducting Cavity Production

Stirbet

Wilson

Wiseman

et al.

Proceedings of the 2005 Particle Accelerator Conference

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“…It uses 4.5 K liquefaction flow to cool the outer conductor; the inner conductor is conduction cooled to a water-cooling loop outside the vacuum system [4,5]. The first pair was successfully warm tested up to 550 kW at LANL [6,7].…”

Section: Cavity Designmentioning

confidence: 99%

The SNS superconducting linac system

Rode

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The SNS has adopted superconducting RF technology for the high-energy end of its linac. The design uses cavities of β = 0.61 and 0.81 to span the energy region from 186 MeV up to a maximum of 1.3 GeV. Thirty-three of the lower β cavities are contained in 11 cryomodules, and there could be as many as 21 additional cryomodules, each containing four of the higher β cavities, to reach the maximum energy. The design uses a peak surface gradient of 35 MV/m. Each cavity will be driven by a 550 kW klystron.Cryomodules will be connected to the refrigerator by a pair of "tee" shape transfer lines. The refrigerator will produce 120 g/sec of refrigeration at 2.1 K, 15 g/sec of liquefaction at 4.5 K, and 8,300 W of 50 K shield refrigeration.

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“…All FPC's are processed on one of two warm test stands [3]. Processing includes a 24hour vacuum bake resulting in vacuum levels ~ 5 E-10 mbar followed by RF processing to 1 MW traveling wave and 2.4 MW standing wave power levels [4]. To date 21 FPC's have been processed to levels required for SNS operations with no difficulties…”

Section: Fundamental Power Couplersmentioning

confidence: 99%

SNS cryomodule performance

Preble

Campisi

Daly

et al.

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440)

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Thomas Jefferson National Accelerating Facility, Jefferson Lab, is producing 24 Superconducting Radio Frequency (SRF) cryomodules for the Spallation Neutron Source (SNS) cold linac. This includes one medium-? (0.61) prototype, 11 medium-? production, and 12 high beta (0.81) production cryomodules. After testing [1], the medium-? prototype cryomodule was shipped to Oak Ridge National Laboratory (ORNL) and acceptance check out has been completed. All production orders for cavities and cryomodule components are being received at this time and the medium-? cryomodule production run has started. Each of the medium-? cryomodules is scheduled to undergo complete operational performance testing at Jefferson Laboratory before shipment to ORNL. The performance results of cryomodules to date will be discussed.

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Testing procedures and results of the prototype fundamental power coupler for the Spallation Neutron Source

Cited by 6 publications

References 5 publications

RF Conditioning and Testing of Fundamental Power Couplers for SNS Superconducting Cavity Production

RF Conditioning and Testing of Fundamental Power Couplers for SNS Superconducting Cavity Production

The SNS superconducting linac system

SNS cryomodule performance

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