[Acc_sem_comm] Accel Sem: June 13 - Info Needed

[Eric Lechner]

Please use: Oxide dissolution and oxygen diffusion scenarios in niobium and implications on the Bean–Livingston barrier in superconducting cavities<https://pubs.aip.org/aip/jap/article/135/13/133902/3280763>

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________________________________
From: Tristan Jones <tristan at jlab.org>
Sent: Monday, June 10, 2024 8:53:15 AM
To: Eric Lechner <lechner at jlab.org>
Cc: Pashupati Dhakal <dhakal at jlab.org>; Acc_Sem_Comm at jlab.org <Acc_Sem_Comm at jlab.org>
Subject: RE: Accel Sem: June 13 - Info Needed


Good Morning and Thanks!



I just need the title of your talk



From: Eric Lechner <lechner at jlab.org>
Sent: Sunday, June 9, 2024 3:57 PM
To: Tristan Jones <tristan at jlab.org>
Subject: Re: Accel Sem: June 13 - Info Needed



Hi Tristan,



See below and attached:

  1.  Bio

     *   I earned a PhD in physics from Temple University in 2019 under Maria Iavarone studying superconductors via scanning tunneling microscopy.

     *   In 2020, I joined JLab  as a post doctoral researcher under Ari Palczewski and Charlie Reece studying impurities in niobium.

     *   In 2022, I Joined JLab as a staff scientist continuing research related to high Q and high gradient

  1.  See attached head shot

  1.  Abstract: We generalize a native Nb2O5 dissolution model [G. Ciovati, Appl. Phys. Lett. 89, 022507 (2006)] to sequential overlayer dissolutions, multilayer dissolution, and realistic temperature profiles, which may be applicable to other materials. The model is applied to secondary ion mass spectrometry depth profile measurements for varying temperature profiles and two-step oxide dissolution in Nb and found to agree well. In the context of the Meissner screening response due to impurity profiles on the length scale of the London penetration depth, the shallow diffusion of O impurities results in a substantial decrease in the peak supercurrent density near the surface. In this framework, oxide dissolution and oxygen diffusion can account for a rise in peak supportable magnetic field in SRF cavities with baking time and a suppression after the optimal baking time is reached, in good agreement with peak-field baking temperatures and times as well as recent quench field measurements.

  1.  See attached graphic

Best,

-Eric

________________________________

From: Tristan Jones <tristan at jlab.org<mailto:tristan at jlab.org>>
Sent: Thursday, June 6, 2024 12:12 PM
To: Eric Lechner <lechner at jlab.org<mailto:lechner at jlab.org>>
Subject: FW: Accel Sem: June 13 - Info Needed



Hi Eric,



Thank you for accepting the invitation to give an Accelerator Seminar, on June 13th. Please send the following:



  *   Bio
  *   Headshot
  *   Abstract
  *   Teaser graphic



Ms. Tristan Jones

Administrative Support

Accelerator Ops, R&D

Jefferson Lab

757.269.6330

Room: ARC/704-1


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