Update from single-cell low temperature doping runs at JLab

Slides:

Advertisements

Similar presentations

Thin Films for Superconducting Cavities HZB. Outline Introduction to Superconducting Cavities The Quadrupole Resonator Commissioning Outlook 2.

Advertisements

Update on the Development of Coated Cavities New Results from 1-cell Cavities at Cornell and JLab Sam Posen, Cornell University May 28, 2013 Linear Collider.

Progress of SRF and ERL at Peking University Lu Xiangyang Institute of Heavy Ion Physics Peking University.

Rong-Li Geng Jefferson Lab High Efficiency High Gradient Cavities - Toward Cutting Down ILC Dynamic Heat Load by Factor of Four R.L. Geng, ALCW2015,

Cornell SRF New Materials Program Nb 3 Sn Development Sam Posen and Matthias Liepe Cornell University TTC Meeting 6 December 2011 Beijing, China.

1/28/04Don Hartill, MC MHz SCRF cavity development Don Hartill LEPP, Cornell University.

Deutsches Elektronen-Synchrotron Helmholtz Association of German Research Centers Hamburg, Germany Unloaded Quality Factor.

High Q R&D at JLab G. Ciovati, P. Dhakal, R. Geng, P. Kneisel, G. Myneni TTC Topical Meeting on CW SRF Cornell Univ., June 12 th -14 th, 2013.

TTC Meeting, Frascati, 5-7 December Summary of EP discussions at Oct SMTF meeting at FNAL T. Tajima (LANL), C. Boffo (FNAL)

R.L. Geng, 5/27-31,2013 ECFA LC2013, DESY 1 Update on Raising Q0 at Ultra-High Gradient via Large-Grain Niobium Material Rongli Geng Jefferson Lab ECFA.

Rongli Geng March 4, th LCC ILC Cavity Group Meeting

Advances in Large Grain Resonators Activities of DESY, W.C. Heraeus and RI material and fabrication aspects preparation and RF test results W. Singer,

ALCPG2011, 3/19- 23, SRF Group Institute of Heavy Ion Physics, Peking University ALCPG /3/19-23, Eugene, Oregon, USA RF superconducting Cavity.

4/28/04Don Hartill, MUTAC MHz SCRF cavity development Don Hartill LEPP, Cornell University.

JLab Update Rongli Geng April 30, th LCC ILC Cavity Group Meeting.

How important is the surface finish/roughness in determining the performance of Nb cavities? Introduction Peter Kneisel Jlab.

High Temperature Heat Treatment to Raise the Quality Factor of Large Grain Niobium Cavities Pashupati Dhakal Gianluigi Ciovati Ganapati Rao Myneni July.

Hydroformed Multi-Cell Cavities. Update Waldemar Singer, DESY Peter Kneisel, JLab.

ELBE SRF Gun Testing Status PeterKneisel (JLAB) For the Rossendorf Team A.Arnold,P.Murcek,J.Teichert,P.Michel,P.Lu, H.Vennekate,R.Xiang T.Kamps (HZB Berlin)

Summary of the Symposium on Ingot Nb and New Results on Fundamental Studies of Large Grain Nb Gianluigi Ciovati Jefferson Lab.

Update at Peking University Jiankui Hao & Kexin Liu Institute of Heavy Ion Physics Peking University, Beijing LCC-ILC-Cavity Meeting March 04, 2015.

Niobium RRR and Ta specifications for SRF cavities: a critical review G. Ciovati, P. Kneisel and G. Myneni 7 th SRF Materials Workshop, July 16 th 2012.

Plasma cleaning Laser re-melting technique at FANL M. Ge, G. Wu, J. Ruan, J. Ozelis, T. Nicol, D. Sergatskov, D. Hicks, L. Cooley Fermi National Accelerator.

Surface Resistance of a bulk-like Nb Film Sarah Aull, Anne-Marie Valente-Feliciano, Tobias Junginger and Jens Knobloch.

LCLS-II Technical Requirements

Vertical Electro-Polishing activities at CEA Saclay

Cornell Updates Series test of single cell is on going.

Juliette Plouin, Enrico Cenni, Olivier Napoly (CEA)

Results on second sound method

New Cavity Techniques and Future Prospects

JLab infusion and LG flux expulsion update

CEPC 1.3GHz and 650MHz high Q Nitrogen doping R&D progress

Surface Analysis of the Quench Area Sample of Cavity Z111

High Q via N infusion R&D at Jefferson Lab

TTC Topical Workshop on SRF Cryomodule Clean Room Assembly

High Q R&D at Fermilab Anna Grassellino TTC Topical Meeting on CW SCRF

Rong-Li Geng Jefferson Lab

A. Yamamoto, S. Michizono, and B. List

9-cell Vender Qualification test for LCLS-II

Recent SCRF Activities in IHEP

The broken HOM Couplers on 3.9 GHz Cavity #2

TTC High Q0 Working Group Summary of developments since last TTC meeting C. Reece.

High Q Cavity Operation in the Cornell Horizontal Test Cryomodule

Highlights from EU Global Design Effort

TTC WG-2 focusing on Nb Material - Properties and Specifications -

TTC topical-meeting on CW SRF 2013

CW accelerating module test progress at DESY

Introduction to Jefferson Lab

N-infusion, Vertical-EP, and ILC cost reduction efforts at Cornell

LCLS-II High Q0 Cavities: Lessons Learned

Cavity Treatment for High Q0 in Realistic Magnetic Fields

Cornell Results 20 V 60 V Changing the Growth of Oxide (By Anodizing) Has Small Effects 20 V.

Development of Large Grain Cavities at DESY

Red – ASTM 5 Black - ASTM 6 Blue - ASTM 7 * Not 900°C

Recap RGA during 800°C bake showed high mass contributions (Hydrocarbons) Samples within a standard 800°C bake showed precipitates as well TTC High Q Meeting.

Vertical Test Results of 9-Cell Cavities for LCLS-II

Recent 160 C “N infusion” impurity doping results

Surface resistance studies as a function of the mean free path

Status of plasma processing at SNS

FNAL update Martina Martinello.

Peng SHA, On behalf of CEPC SRF group

Nb films Sergio Calatroni for the new CERN SRF & films team 5/21/2019

JLab Doping Protocol Exploration

Quench Studies in Single and Multicell N-Doped Cavities

Field Emission and Mitigation in the CEBAF Linacs R Legg, R Geng Jlab SRF Ops Dept. TTC,

Low-T Baking at Cornell

JLab Work on Low Temperature Near-Surface Diffusion aka “Infusion”

First results Plasma etching

The LCLS-II HE High Q0 and Gradient R&D Program

Infusion R&D at DESY TTC Meeting at TRIUMF –

Presentation transcript:

Update from single-cell low temperature doping runs at JLab TTC High-Q Working Group - 16 Pashupati Dhakal Thursday, November 29, 2018

Earlier Results 1.5 GHz single-cell fine-grain Nb cavity (RRR>300) N-infusion: 800 °C/3h, N2 at ~25 mTorr at 290°C, cooling to hold temperature maintained for 48 h P. Dhakal et al., Phys. Rev. Accel. Beams. 21, 032001 (2018)

TD5_LG ( gas injected at 140C)

TD5_LG ( gas injected at ~290C)

TD5_LG ( gas injected at ~290C) 2 HF rinse took away the effect !

LSF1-3_LG ( gas injected at ~290C)

RDT 14_FG (gas injected ~ 280 C)

RDT 14_FG (gas injected ~ 280 C) 1 HF rinse took away the effect with Eacc degradation

Path Forward: Conclusions Reproducible when gas injected at higher temperature. No high Q results when gas injected at lower temperature (3 total runs), cause unknown. Path Forward: Furnace upgrade to measure cavity surface temperature. More sample coupon study when gas injected at different temperature. Develop consistent, reproducible recipe to achieve high Q and high Eacc