Progress of LSF-Shape Cavity Study - PowerPoint Presentation

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Progress of LSF-Shape Cavity Study - PPT Presentation

Rong Li Geng Jefferson Lab European Linear Collider Workshop 2016 ECFALC2016 RL Geng ECFALC2016 53065 2016 Achieved ILC Cavity Performance at JLAB 20082010 2K 18K All TESLAshape finegrain ID: 915746

lsf cavity cavities shape cavity lsf shape cavities geng cell 2016 ecfalc2016 field 1300 grain high ilc jlab eacc

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Slide1

Progress of LSF-Shape Cavity Study

Rong-Li GengJefferson Lab European Linear Collider Workshop 2016 (ECFALC2016)

R.L. Geng, ECFALC2016, 5/30-6/5, 2016

Slide2

Achieved ILC Cavity Performance at JLAB (2008-2010)

1.8K

All TESLA-shape fine-grain

cavities

At 16 MV/m at 2K

<Q0>=1.5+/-0.3E10

scatter 1.2-1.8E10

At 16 MV/m at 1.8K

Q0~2.2E10, one cavity

R&D Goal

=2×10

G=45 MV/m

R.L. Geng, ECFALC2016, 5/30-6/5, 2016

Slide3

High Efficiency Cavity Shape

TESLALow-loss/ICHIRO

Re-entrant

Low-surface-field

frequency

MHz

1300

Aperture

60Epk/Eacc-

1.98

2.36

2.281.98Hpk/EaccmT/(MV/m)4.153.613.543.71Cell-cell coupling%1.901.521.571.27G*R/Q230840379704120836995

Li, C. Adolphsen, A New SRF Cavity Shape with Minimized Surface Electric and Magnetic Fields for the ILC, LINAC08 (2008).R.L Geng et al., Development of Ultra High Gradient and High Q0 Superconducting Radio Frequency Cavities, IPAC13 (2013).

20% more efficient as compared to TESLA shapeKeep peak electric field ratio the same

R.L. Geng, ECFALC2016, 5/30-6/5, 2016

Slide4

R.L. Geng, ECFALC2016, 5/30-6/5, 2016

HEHG Cavities Lessons Learned:

LSF shape

Lowering

Hpk

Eacc

without sacrificing

Epk

Eacc

Field emission can not be ignored!

Slide5

LSF

TESLA

R.L. Geng, ECFALC2016, 5/30-6/5, 2016

Slide6

LSF Prototype Cavities

Two single-cell LSF shape cavities built and tested (LSF1-2 & LSF1-3)

Ningxia

arge-grain

Both reached 37-38 MV/m without field emission

BCP so far

EP next to raise gradient

Slide7

LSF Prototype Cavities

Slide8

First 5-cell LSF shape cavity

Slide9

Re-producible half cells suitable for high-volume production

Slide10

R.L. Geng, NRI visit of JLab, Nov. 13, 2015

1.5 GHz, CEBAF upgrade Low-Loss Shape

OTIC Large Grain Nb

Cavity processing: Bulk BCP + 800Cx2hr

Final Processing: EP 30 um + 120Cx18hr

LG cavity PJ1-2 (

JLab

-PKU-OTIC collaboration)

Slide

IPAC15, WEPWI013

Most Recent Progress (1)

Slide11

Concluding Remarks

LSF cavity may be applied for ILC 1 TeV energy reach. “Field emission free” up to Epk

=100 MV/m achieved in 1-cell CEBAF upgrade “Low-loss” shape cavity. Excellent results in LSF shape + large-grain Nb cavities achieved in two 1-cell cavities.

First 5-cell LSF cavity competed

All parts for a 9-cell LSF cavity are in hand.

R.L. Geng, ECFALC2016, 5/30-6/5, 2016