Qualification of SSR1 cavities for PIP-II Soniya Samani Queen Mary - - PowerPoint PPT Presentation

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Qualification of SSR1 cavities for PIP-II Soniya Samani Queen Mary - - PowerPoint PPT Presentation

Aug 13, 2022 33 likes •113 views

Qualification of SSR1 cavities for PIP-II Soniya Samani Queen Mary University of London Supervisors: Dr Alexander Sukhanov, Dr Donato Passarelli 13 th of July 2018 PIP-II Superconducting (SC) Linac ! " beam to deliver > # $% power to

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SLIDE 1

Soniya Samani

Queen Mary University of London Supervisors: Dr Alexander Sukhanov, Dr Donato Passarelli 13th of July 2018

Qualification of SSR1 cavities for PIP-II

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SLIDE 2

PIP-II Superconducting (SC) Linac

2

  • !" beam to deliver

> # $% power to DUNE/LBNF.

  • &'' $() SC linac
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SLIDE 3

7/12/18 Soniya Samani | Qualification of SSR1 cavities for PIP-II 3

Single Spoke Resonator Cavities (SSR1)

  • ! = #. %%
  • EM cavities that resonate with a

radio frequency (RF) at &%' ()*

  • Niobium cavity operates at %+-

cooled via superfluid He

  • Acceleration of ,- : /# − /1' (23
  • Intrinsic quality factor.

45 =

67 89 ~/#/#

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7/12/18 Soniya Samani | Qualification of SSR1 cavities for PIP-II 4

Qualification of 12 bare SSR1 cavities

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7/12/18

Limitation of cavity performance: Multipacting

Soniya Samani | Qualification of SSR1 cavities for PIP-II 5

Resonant exponential increase in electron discharge. Prevents SSR1 from gaining RF power.

Dependent on:

  • !" synchronized with RF field
  • Impact energy such that

secondary emission yield # > 1

$ = #&

Processed via:

MULTIPACTOR CONDITIONING

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SLIDE 6

7/12/18

Multipactor Conditioning Analysis

Soniya Samani | Qualification of SSR1 cavities for PIP-II 6

  • !"## ∝

%&'(

  • Power loss calculated

by: %&'( − %*!+ − %,*-.

  • Increasing RF power

increases power loss.

  • Conditioning limited by

cryogenic capability of helium vessel. Gradual increase of RF power whilst allowing multipacting to progress; /0 improves.

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SLIDE 7

7/12/18

Initial Results:

Soniya Samani | Qualification of SSR1 cavities for PIP-II 7

Project aim: Multipactor conditioning data analysis. Relate microscopic behaviour of multipactor to macroscopic parameters.

  • 1. Write a script using C++/ROOT to read data from Acnet.
  • 2. Correlate power loss/energy consumption with radiation emission.
  • 3. Compare with model simulation.

Power loss as a function of time Integral of power loss

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7/12/18 Soniya Samani | Qualification of SSR1 cavities for PIP-II 8

Summary…

  • Proton Improvement Plan II (PIP II)
  • Cavity under analysis: Single Spoke

Resonator (SSR1)

  • Problem: Limitation of cavity performance

due to multipacting

  • Current solution: Multipacting conditioning
  • My project: Correlate multipactor data with

cavity parameters