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Update on  Resistivity Measurements Coated Collimators Update on  Resistivity Measurements Coated Collimators

Update on Resistivity Measurements Coated Collimators - PowerPoint Presentation

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Update on Resistivity Measurements Coated Collimators - PPT Presentation

and Control Procedure Adnan Kurtulus Nicolò Biancacci Benoit Salvant Acknowledgments CAccettura DAmorim FCarra FCaspers CCastro FDi Lorenzo ID: 805255

nohm measurements blocks impacted measurements nohm impacted blocks dti cavity cern part clean resistivity coated samples hrmt coating upstream

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Slide1

Update on Resistivity Measurements Coated Collimators and Control ProcedureAdnan Kurtulus, Nicolò Biancacci , Benoit SalvantAcknowledgments: C.Accettura , D.Amorim, F.Carra, F.Caspers, C.Castro, F.Di Lorenzo, R.Fiastre, I.Llamas Garcia, E.Métral, W.Vollemberg, M.Wendt.

1

Slide2

OutlineSummary of DTI Mo coating measurements followup:Quick introduction on the methodHow close measurements are to expectation?Thermal process impactsFollow up statusNew cavity production for smaller samples Additional contents:Measurements on HRMT-35 impacted blocks Measurements on DTI coated CERN BlocksBench measurements plan on low impedance collimators

2

Slide3

Quick introduction on the methodThe procedure is based on the application of a pillbox cavity optimized for H011 mode operation.Mode of operation: H011 (most insensitive to cap contacts)Mitered internal part to separate adjacent E modes.Electric and Magnetic Field distribution of H011 mode at 16.63 GHz

3

H field

Slide4

Quick introduction on the methodThe procedure is based on the application of a pillbox cavity optimized for H011 mode operation.Mode of operation: H011 (most insensitive to cap contacts)Mitered internal part to separate adjacent E modes.Copper cavity with open cap -> reference copper end cap.DUT replacing end cap: wall resistivity change -> Q change4

Cavity w/o end cap

Cavity w/ end cap

Cavity w/ DUT end cap

Slide5

Simulated Q change vs end cap resistivityChange in Q vs change in resistivity simulated in CST and reproduced by curve

 

with

,

and

resp. power dissipated in the end cap and rest of the cavity.

 

Simulated Q change vs end cap resistivity

Measured Q change vs end cap resistivity

Measured relative Q change for thick metals

(e.g. Cu, Al, In, Ta, Mo, SS, …) borrowed from TE-VSC-SCC (many thanks!).

Resistivity was accurately measured with the

Sigmameter

(at 900kHz, many thanks Carlotta,

Fede

and Jorge for the support!)

Curve in excellent agreement with measured data

!

5

Quick introduction on the method

Slide6

OutlineSummary of DTI Mo coating measurements followup:Quick introduction on the methodHow close measurements are to expectation?Thermal process impactsFollow up statusNew cavity production for smaller samples Additional contents:Measurements on HRMT-35 impacted blocks Measurements on DTI coated CERN Blocks

Bench measurements plan on low impedance collimators

6

Slide7

How close measurements are to expectation?7Decision taken in DecemberResistivity nOhm.m

Slide8

How close measurements are to expectation?8Decision taken in DecemberResistivity nOhm.mMeasurements are done on samples

Decision

taken in December

Resistivity

nOhm.m

Slide9

How close measurements are to expectation?9Decision taken in DecemberResistivity nOhm.mMeasurements are done on samplesDecision taken in December

Measurements are done on

blocks

Resistivity

nOhm.m

Slide10

How close measurements are to expectation?10Decision taken in DecemberResistivity nOhm.mClose measurement follow up

nOhm.m

 

(Theoretical

53.4

nOhm.m

)

Resistivity

nOhm.m

Slide11

OutlineSummary of DTI Mo coating measurements followup:Quick introduction on the methodHow close measurements are to expectation?Thermal process impactsFollow up statusNew cavity production for smaller samples Additional contents:Measurements on HRMT-35 impacted blocks Measurements on DTI coated CERN Blocks

Bench measurements plan on low impedance collimators

11

Slide12

Thermal process impactsThermal treatment is applied to Pre-batch DTI samples.It observed that there is no impact on resistivities.12Bulk measurementsCoating measurements

Before and after Thermal Treatment ratios

Sample 1

Sample 2

Sample 1

Sample 2

Slide13

OutlineSummary of DTI Mo coating measurements followup:Quick introduction on the methodHow close measurements are to expectation?Thermal process impactsFollow up statusNew cavity production for smaller samples Additional contents:Measurements on HRMT-35 impacted blocks Measurements on DTI coated CERN Blocks

Bench measurements plan on low impedance collimators

13

Slide14

Follow up statusPre-serie B was shipped last Friday to DTI.Coated items are expected to be back at CERN in week 22 (27-31/05).Actions starting from week 22 will be as follows:Thermal Treatment (post Mo coating) of MoGr blocks and MoGr samples. (EN-MME)RF impedance measurement on samples.3)   Outgassing measurements by TE-VSC-BVO.4)   Thickness measurement and adhesion.

14

Slide15

OutlineSummary of DTI Mo coating measurements followup:Quick introduction on the methodHow close measurements are to expectation?Thermal process impactsFollow up statusNew cavity production for smaller samples Additional contents:Measurements on HRMT-35 impacted blocks Measurements on DTI coated CERN Blocks

Bench measurements plan on low impedance collimators

15

Slide16

New cavity production for small samples New small cavity is on fabrication. New connectors are bought with spares (thanks to Elias and Francesco!)Dielectric material will be use to shift resonant frequency down (25GHz ->15.6 GHz).It will be used to measure new/old smaller samples (20X20mm).16Courtesy of I.L.Garcia and R.Fiastre

Slide17

OutlineSummary of DTI Mo coating measurements followup:Quick introduction on the methodHow close measurements are to expectation?Thermal process impactsFollow up statusNew cavity production for smaller samples Additional contents:Measurements on HRMT-35 impacted blocks Measurements on DTI coated CERN Blocks

Bench measurements plan on low impedance collimators

17

Slide18

Measurements on HRMT-35 impacted blocks Mo on GrSpecial thanks to Manfred Wendt and C.Castro for the portable VNA!18Measurements on both clean and impacted surfaces.~fact2 increase in effective resistivity (S21 curve distorted.)

Upstream clean part

798

nOhm.m

Slide19

Measurements on HRMT-35 impacted blocks Mo on Gr19Measurements on both clean and impacted surfaces.~fact2 increase in effective resistivity (S21 curve distorted.) Upstream clean part798

nOhm.m

Upstream clean part

798

nOhm.m

Upstream clean part

798

nOhm.m

Upstream impacted part

1376

nOhm.m

Special thanks to Manfred Wendt and

C.Castro

for the portable VNA!

Slide20

Measurements on HRMT-35 impacted blocks Cu on Gr #120Measurements on both clean and impacted surfaces.~fact2 increase in effective resistivity (S21 curve distorted.)Downstream Clean Part

70

nOhm.m

Slide21

Measurements on HRMT-35 impacted blocks Cu on Gr #121Measurements on both clean and impacted surfaces.~fact2 increase in effective resistivity (S21 curve distorted.)Downstream Clean Part Downstream with 3 stripes70 nOhm.m136 nOhm.m

Downstream Clean Part

70

nOhm.m

Downstream Impacted Part

136

nOhm.m

Slide22

Measurements on HRMT-35 impacted blocks Cu on Gr #222

Measurements on both clean and impacted surfaces.

~fact2 increase in effective resistivity (S21 curve distorted.)

Upstream Clean Part

70

nOhm.m

Slide23

Measurements on HRMT-35 impacted blocks Cu on Gr #223

Measurements on both clean and impacted surfaces.

~fact2 increase in effective resistivity (S21 curve distorted.)

Same relative behaviour

for both Mo and Cu impacted blocks.

Upstream Clean Part

70

nOhm.m

Upstream Clean Part

70

nOhm.m

Upstream Impacted Part (1)

163

nOhm.m

Slide24

Measurements on HRMT-35 impacted blocks Cu on Gr #224

Measurements on both clean and impacted surfaces.

~fact2 increase in effective resistivity (S21 curve distorted.)

Same relative behaviour

for both Mo and Cu impacted blocks.

Upstream Clean Part

70

nOhm.m

Upstream Clean Part

70

nOhm.m

Upstream Impacted Part (1)

163

nOhm.m

Upstream Clean Part

70

nOhm.m

Upstream Impacted Part (1)

163

nOhm.m

Upstream Impacted Part (2)

163

nOhm.m

Slide25

Simulation of stripe effectWorking on simulation to observe stripe effect. 25

Slide26

OutlineSummary of DTI Mo coating measurements followup:Quick introduction on the methodHow close measurements are to expectation?Thermal process impactsFollow up statusNew cavity production for smaller samples Additional contents:Measurements on HRMT-35 impacted blocks Measurements on DTI coated CERN Blocks

Bench measurements plan on low impedance collimators

26

Slide27

Measurements on DTI coated CERN BlocksMo on Gr face 1(CERN Coated)Mo on Gr face 2Mo on Gr face 3Mo on Gr face 41426 nOhm.m90 nOhm.m

105

nOhm.m104 nOhm.m

27

Performed measurements on an old CERN produced Mo coating on Gr block.

1 face: old CERN coating

3 remaining faces coated by DTI.

Good performance confirmed but

old non-smooth bulk surface decreases conductivity

.

Slide28

Measurements on DTI coated CERN Blocks28Measurement done also on specific samples by C.Accettura at DC.Resistivity of Mo on Gr (R4450) and MoGr (Nb8304Ng )

Material

#

sample

Average [

nOhm.m

]

Dev.

Standard

[MS/m]

Dev.

Standard [% of the

average

value]

Uncertainty

[%]

Graphite

R4550

8

476

2

~36

~36

Nb8304Ng (MoGr)

12

43.4

6

~30

~43

Very high roughness

https

://indico.cern.ch/event/816840/contributions/3412132/attachments/1842475/3021740/20190510_4probesmethod.pdf

H011 cavity

[

nOhm.m

]

~1000

~52

Roughness effect

might play a role on

Gr

meas.

Mo

coating at DTI

Slide29

Measurements on DTI coated CERN BlocksCu on Gr face 2Cu on Gr face 3Cu on Gr face 420 nOhm.m19 nOhm.m24 nOhm.m29Performed measurements on an old CERN produced Cu coating

on Gr block

.3 remaining faces coated by DTI.

Less effect of bulk surface properties.

Slide30

Measurements on DTI coated CERN Blocks30Measurement done also on specific samples by C.Accettura at DCResistivity of Mo on Gr (R4450) and MoGr (Nb8304Ng) https://indico.cern.ch/event/816840/contributions/3412132/attachments/1842475/3021740/20190510_4probesmethod.pdf

Material

#

sample

Average [

nOhm.m

]

Dev.

Standard

[MS/m]

Dev.

Standard [% of the

average

value]

Uncertainty

[%]

Graphite

R4550

9

19.2

4

~7

~57

Nb8304Ng

8

26.3

14

~37

~64

Cu coating at DTI

H011 cavity

[

nOhm.m

]

~21

No

Data

Good agreement with DC measurements.

Slide31

OutlineSummary of DTI Mo coating measurements followup:Quick introduction on the methodHow close measurements are to expectation?Thermal process impactsFollow up statusNew cavity production for smaller samples Additional contents:Measurements on HRMT-35 impacted blocks Measurements on DTI coated CERN Blocks

Bench measurements plan on low impedance collimators

31

Slide32

Bench measurements plan on low impedance collimatorsThe status of collimators measurements will be follow as below:Asking for pictures of the assembled jaw before closing the collimator cover (to check for scratches or obvious issues)Performing probe measurements to check if there is any non-conformity-> Repeating measurements for different insertion length of probes and jaw apertures. Applying it to each collimators to compare the results one to one for easy comparison.

In

case of issue,

requesting

to

measure with the wire

.

->

M

easurements for

different wire positions

and

jaw apertures

.

5/14/2019

32

Slide33

Summary and OutlookFollow-up of low impedance collimator’s block:DTI’s Pre-Batch samples and blocks resistivity shows good agreement with expectations.It is observed that there is no impact on resistivity from thermal treatment.The design of new small cavity has finalized. It is on fabrication.RF impedance measurement on Pre-serie B will be week 22.Additional development and observations:HRMT-35 impacted blocks: The effects of damage due to beam impact is clearly observed and reproducible across coating materials (Mo, Cu). Simulations are on going with CST to reproduce S21 measurement.Measurements are done on DTI coated old CERN blocks. The results of DTI coatings are consistent.Bench measurements plan on low impedance collimators:Visual check of the assembled jaw before closing the

collimator.

Probe measurements on selected configurations (probes/jaws).In case of

issue -> Wire Measurements.

33

Slide34

Thanks for your attention!34