Plasma ignition and tuning in different cells of a 1.3 GHz nine-cell superconducting radio frequency cavity: Proof of principle

Tyagi, Puneet; Moss, A.; Goudket, P.; Pattalwar, Shrikant; Herbert, J. D.; Valizadeh, Reza; McIntosh, Peter

doi:10.1016/j.nima.2018.02.087

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…The first plasma ignition experiments on LCLS-II cavities were carried out to prove feasibility of ignition using HOMs and HOM couplers. Prior to the experiments at FNAL plasma ignition has been tried only with fundamental pass-band mode of SRF multi-cell cavities 3,11,12 . Ignition power and its dependence on the gas type and pressure have been studied and the results for LCLS-II cavities with Ne and Ar are presented in the following section.…”

Section: Plasma Ignition Experimentsmentioning

confidence: 99%

Low RF Power Plasma Ignition and Detection for In-Situ Cleaning of 1.3 GHz 9-Cell Cavities

Berrutti

Lcls-Ii²,

Giaccone

et al. 2019

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Superconducting Radio Frequency (SRF) cavities performance preservation is crucial, from vertical test to accelerator operation. Field Emission (FE) is still one of the performance limiting factors to overcome and plasma cleaning has been proven successful by the Spallation Neutron Source (SNS), in cleaning field emitters and increasing the work function of Nb. A collaboration has been established between Fermi National Accelerator Laboratory (FNAL), SLAC National Accelerator Laboratory and Oak Ridge National Laboratory (ORNL) with the purpose of applying plasma processing to the Linac Coherent Light Source-II (LCLS-II) cavities, in order to minimize and overcome field emission without affecting the high Q of nitrogendoped cavities. The cleaning for LCLS-II will follow the same plasma composition adopted at SNS, which allows in-situ processing of cavities installed in cryomodules from hydrocarbon contaminants. A novel method for plasma ignition has been developed at FNAL: a plasma glow discharge is ignited using high order modes to overcome limitations imposed by the fundamental power coupler, allowing in-situ cleaning for cavities in cryomodule. The plasma can be easily ignited and tuned in each of the cavity cells using low RF power. A method for plasma detection has been developed as well, which allows the detection of the plasma location in the cavity without the need of cameras at both cavity ends. The presented method can be applied to other multi-cell cavity designs, even for accelerators where the coupling for the fundamental modes at room temperature is very weak.

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Section: Plasma Ignition Experimentsmentioning

confidence: 99%

Low RF Power Plasma Ignition and Detection for In-Situ Cleaning of 1.3 GHz 9-Cell Cavities

Berrutti

Lcls-Ii²,

Giaccone

et al. 2019

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show abstract

In-situ plasma cleaning to decrease the field emission effect of half-wave superconducting radio-frequency cavities

Yang

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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Plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities

Berrutti

Giaccone

Martinello

et al. 2019

Journal of Applied Physics

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Superconducting radio frequency cavities performance preservation is crucial, from vertical test to accelerator operation. Field emission is still one of the performance limiting factors to overcome, and plasma cleaning has been proven successful by the Spallation Neutron Source (SNS), in cleaning field emitters (hydrocarbon contaminants) and increasing the work function of Nb. The cleaning for Linac Coherent Light Source-II will follow the same plasma composition adopted at SNS, which allows in situ processing of cavities installed in cryomodules. A novel method for plasma ignition has been developed at the Fermi National Accelerator Laboratory: a plasma glow discharge is ignited using high order modes to overcome limitations imposed by the fundamental power coupler. The plasma can be easily ignited and tuned in each of the cavity cells using low radio frequency (RF) power, from 100 W to as low as 2 W depending on the gas and pressure. A method for RF plasma detection has been developed: the plasma location is identified within the cavity without the need of cameras. The presented method can be applied to other multicell cavity designs, even for accelerators where the coupling for the fundamental modes at room temperature is very weak.

show abstract

Plasma ignition and tuning in different cells of a 1.3 GHz nine-cell superconducting radio frequency cavity: Proof of principle

Cited by 3 publications

References 10 publications

Low RF Power Plasma Ignition and Detection for In-Situ Cleaning of 1.3 GHz 9-Cell Cavities

Low RF Power Plasma Ignition and Detection for In-Situ Cleaning of 1.3 GHz 9-Cell Cavities

In-situ plasma cleaning to decrease the field emission effect of half-wave superconducting radio-frequency cavities

Plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities

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