Conditioning in RF structures

A.D., J.G.N. 28-02-2014

Conditioning history of two structures at KEK and CERN

• CERN TD26R05CC conditioning history plot

TD26R05 CC conditioned at CERN

61

301

pulsetBDRE

61

pulsetE

equivalent conditioning curve with constant pulse length of 250 ns since the beginning

equivalent conditioning curve with:- constant pulse

length of 250 ns since the beginning

- constant BDR of 1e-6 bpp/m

7e-05 2e-05automatic conditioning ON

It would take longer time to reach the same gradient with smaller BDR (as expected)

Conditioning history of two structures at KEK and CERN

• TD24R05#4 at KEK

TD24R05#4 conditioned at KEK - history

Conditioning BDR measurements

TD24R05 conditioned at KEK

61

301

pulsetBDRE

equivalent conditioning curve with:- constant pulse

length of 250 ns since the beginning

- constant BDR of 1e-6 bpp/m

5.5e-06 4.8e-06

2.3e-062.7e-06

1.4e-069.2e-07Conditioning curve

of TD24R05 at KEK

BDR during conditioning

Moving average with a window of 10 MPulses

Comparison of conditining curves

61

301

pulsetBDRE

normalized gradient

gradient

KEK, TD24R05#4CERN TD26R05CC

Comparison of conditining curves

61

301

pulsetBDRE

normalized gradient

gradient

KEK, TD24R05#4CERN TD26R05CC

Comparison of E0 vs #BDKEK, TD24R05#4CERN TD26R05CC

Normalized Gradient

Overlapped

𝐸𝑎

𝑡𝑝−1 /6 BDR1/30

Normalized Gradient𝐸𝑎

𝑡𝑝−1 /6 BDR1/30

Normalized Gradient𝐸𝑎

𝑡𝑝−1 /6 BDR1/30

VS #RF Periods (tpulsex12GHz)

Normalized GradientLOG-LOG scale

𝐸𝑎

𝑡𝑝−1 /6 BDR1/30

Normalized Gradient

𝐸𝑎

𝑡𝑝−1 /6 BDR1/30

LOG-LOG scale + Linear FIT

Slope = 0.287 +/- 0.001

Slope = 0.2579 +/- 0.0006

(Slope error corresponds to least-square fit method)

Normalized BDR𝐵𝐷𝑅𝐸𝑎30 𝑡𝑝5 LOG-LOG scale

Normalized BDRLOG-LOG scale + Linear FIT

Slope = -8.35 +/- 0.02

Slope = -7.74 +/- 0.02

(Slope error corresponds to least-square fit method)

𝐵𝐷𝑅𝐸𝑎30 𝑡𝑝5

Fit of conditioning curves

E0*=a Nb

E0*=a log(N) + b

KEK, TD24R05#4CERN TD26R05CC