Air Tuner 201 MHz MICE Cavity Luca Somaschini INFN - PISA Sing - - PowerPoint PPT Presentation

Air Tuner

201 MHz MICE Cavity

Luca Somaschini INFN - PISA

Sing Single le C Cavity Module vity Module

Luca Somaschini - INFN Pisa 2

Tuning System: Tuning System:

• 6 Forks per cavity
• Controlled by 6

pneumatic actuators

Sing Single le C Cavity Module vity Module

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Sing Single le C Cavity Module vity Module

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Tuning System: Tuning System:

• Forks will be in

vacuum

• Actuators will be
• utside vacuum

vessel

Sing Single le C Cavity Module vity Module

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Test Sta st Stand nd

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• Proportional Valves
• LabViev ModBus

controller

• One set of valves

for all 6 pistons

Test Sta st Stand nd

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Test Stand:

• Hoop to simulate

the response of the cavity

Me Measur surements nts

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Goal(s) Goal(s) – Already Achieved: Already Achieved:

• Write a control software (LabView)
• Check for a uniform response of all 6

actuators

• Calibrate the control system: P vs Deflection

curve

Me Measur surements nts

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1) Deflection: 1) Deflection:

• Test hoop

deflection measured with a dial gauge.

Me Measur surements nts

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1) Deflection: 1) Deflection:

• Test hoop

deflection measured with a dial gauge.

z ¡

Me Measur surements nts

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Me Measur surements nts

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2) 2) Δ∇ Δ∇x Gap: Gap:

• Fork gap Variation

measured with a lineal potentiometer

• Readout with NI

ADC and LabView

• Voltage output

converted into mm.

Me Measur surements nts

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2) 2) Δ∇ Δ∇x Gap: Gap:

• Fork gap Variation

measured with a lineal potentiometer

• Readout with NI

ADC and LabView

• Voltage output

converted into mm.

Me Measur surements nts

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3) Pressure: 3) Pressure:

• Pressure measured directly from ModBus

controllers read-out.

Rang nges a s and Se nd Sensitivity nsitivity

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We have a good resolution We have a good resolution

Ranges ¡Results ¡

Pressure ¡(PSI) ¡ Deflec4on ¡(mm) ¡ Transducer ¡(V) ¡ Gap ¡(mm) ¡ Range ¡ ± ¡80 ¡ ± ¡1.78 ¡ ± ¡0.787 ¡ ± ¡4.002 ¡ Mean ¡Error ¡ 1.5 ¡ 1.3E-­‑02 ¡ 4E-­‑03 ¡ 8E-­‑03 ¡

Sing Single le A Actua tuator A tor Ana naly lysis sis

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• We consider the example of one

We consider the example of one actuator actuator

• All other actuator behave similarly

All other actuator behave similarly

Sing Single le A Actua tuator A tor Ana naly lysis sis

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• 80
• 60
• 40
• 20

• 2
• 1.5
• 1
• 0.5

Actuator 5 - Complete Cycle Actuator 5 - Complete Cycle

1) Hysteresis: 1) Hysteresis:

• Data show a small

hysteresis (+/- 0.3 mm)

• If the cycle is repeated

it overlaps the previous

• ne

2) Slopes: 2) Slopes:

• Slopes obtained by

pushing and pulling are different

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Pressure (PSI)

• 80
• 60
• 40
• 20

20 40 60 80 x Gap (mm)

• 4
• 2

2 4

Actuator 5 - Complete Cycle Actuator 5 - Complete Cycle

1) Hysteresis: 1) Hysteresis:

• Also this variables

show a small hysteresis

2) Slopes: 2) Slopes:

• Slopes obtained by

pushing and pulling are still different

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x Gap (mm)

• 4
• 2

2 4 Deflection (mm)

• 2
• 1.5
• 1
• 0.5

0.5 1 1.5 2

Actuator 5 - Complete Cycle Actuator 5 - Complete Cycle

1) Hysteresis: 1) Hysteresis:

• The cycle area is

significantly smaller

2) Slopes: 2) Slopes:

• Same slope for pushing

and pulling

Hysteresis is not due to fork Hysteresis is not due to fork – hoop and and seems hoop and and seems to depend on the actuator to depend on the actuator

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Let’s now consider the mean value of each Let’s now consider the mean value of each hysteresis cycle branch hysteresis cycle branch

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Pressure (PSI) 10 20 30 40 50 60 70 80 Deflection (mm)

• 2.5
• 2
• 1.5
• 1
• 0.5

0.5 1 1.5 2 2.5

/ ndf

• 0.471 / 7

p0 0.03171 ± 0.01393 p1 0.0005479 ±

• 0.02529

/ ndf

• 0.471 / 7

p0 0.03171 ± 0.01393 p1 0.0005479 ±

• 0.02529

Actuator 5 - Mean

/ ndf

• 0.3835 / 7

p0 0.03101 ± 0.04198 p1 0.0006052 ± 0.02221 / ndf

• 0.3835 / 7

p0 0.03101 ± 0.04198 p1 0.0006052 ± 0.02221

Slopes: Slopes:

• As expected the two

slopes are slightly different

• 13% of difference

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Pressure (PSI) 10 20 30 40 50 60 70 80 x Gap (mm)

• 5
• 4
• 3
• 2
• 1

1 2 3 4 5

/ ndf

• 0.3973 / 7

p0 0.05654 ±

• 0.03366

p1 0.00104 ± 0.05634 / ndf

• 0.3973 / 7

p0 0.05654 ±

• 0.03366

p1 0.00104 ± 0.05634

Actuator 5 - Mean

/ ndf

• 0.9804 / 7

p0 0.05293 ±

• 0.1036

p1 0.001058 ±

• 0.05007

/ ndf

• 0.9804 / 7

p0 0.05293 ±

• 0.1036

p1 0.001058 ±

• 0.05007

Slopes: Slopes:

• As expected also these

two slopes are slightly different

• 12% of difference

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x Gap (mm)

• 10
• 8
• 6
• 4
• 2

2 4 6 8 10 Deflection (mm)

• 2
• 1.5
• 1
• 0.5

0.5 1 1.5 2

/ ndf

• 0.09205 / 6

p0 0.04001 ± 0.001456 p1 0.009483 ±

• 0.4495

/ ndf

• 0.09205 / 6

p0 0.04001 ± 0.001456 p1 0.009483 ±

• 0.4495

Actuator 5 - Mean

/ ndf

• 0.05184 / 7

p0 0.03625 ±

• 0.006131

p1 0.01331 ±

• 0.4442

/ ndf

• 0.05184 / 7

p0 0.03625 ±

• 0.006131

p1 0.01331 ±

• 0.4442

Slopes: Slopes:

• Slopes are comparable
• 0.3% of difference
• Slope difference seems

to depend on the actuators

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Let’s consider the overall behavior by Let’s consider the overall behavior by comparing the slopes of all actuators comparing the slopes of all actuators

Gr Group B

• up Beha

haviour viour

Gr Group B

• up Beha

haviour viour

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Actuator Number 1 2 3 4 5 6 Slope (mm/PSI)

• 0.03
• 0.029
• 0.028
• 0.027
• 0.026
• 0.025
• 0.024
• 0.023
• 0.022
• 0.021
• 0.02

P vs Deflection - Squeeze

/ ndf

• 0.275 / 5

p0 0.0002218 ±

• 0.02541

/ ndf

• 0.275 / 5

p0 0.0002218 ±

• 0.02541

P vs Deflection - Squeeze

Squeeze: Squeeze:

• Pistons behave VERY

uniformly

Gr Group B

• up Beha

haviour viour

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Actuator Number 1 2 3 4 5 6 Slope (mm/PSI) 0.018 0.019 0.02 0.021 0.022 0.023 0.024 0.025 0.026 0.027 0.028

P vs Deflection - Stretch

/ ndf

• 1.975 / 5

p0 0.0002038 ± 0.0226 / ndf

• 1.975 / 5

p0 0.0002038 ± 0.0226

P vs Deflection - Stretch

Stretch: Stretch:

• Pistons do not behave

so uniformly

• PropValves have been

swapped -> doesn’t depend on valves

How bad is this difference? How bad is this difference? Let’s have a closer look Let’s have a closer look

Gr Group B

• up Beha

haviour viour

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ΔS = Smax − Smin ≈ 0.0011mm / PSI ΔDeflecton = 0,11mm @100PSI

P vs Deflection - Stretch

• 1.975 / 5

• 1.975 / 5

P vs Deflection - Stretch

ΔDeflecton = 5%

Gr Group B

• up Beha

haviour viour

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Squeezing Slope: 0.02541 mm/PSI Squeezing Slope: 0.02541 mm/PSI Stretching Slope: 0.0226 mm/PSI Stretching Slope: 0.0226 mm/PSI Slopes are different but it’s not a problem Slopes are different but it’s not a problem These are obtained with two different pneumatic These are obtained with two different pneumatic circuits circuits We simply need to use two different calibrations when We simply need to use two different calibrations when squeezing or stretching squeezing or stretching

Next Ste xt Step: R p: RF T F Test st

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Control system will be equipped with electronic pressure gauges

Next Ste xt Step: R p: RF T F Test st

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Control system will be equipped with electronic pressure gauges

z ¡

Next Ste xt Step: R p: RF T F Test st

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Test in Lab 6: Measurements

• RF Parameters: f, Q, S11, S21 (Network Analyser)
• Pressure (Remote Pressure gauges)
• Fork gap variation (Linear Potentiometers)

With copper and beryllium windows

Next Ste xt Step: R p: RF T F Test st

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Test in Lab 6:

• All actuators will be connected to the same

proportional valves.

• We will obtain F vs P curve for the tuning

system

• This calibration curve will be used for the

tuning feedback loop in the MTA

Next Ste xt Step: R p: RF T F Test st

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Test in Lab 6:

• Manual valves will allow to simulate the

failure of one or more actuators.

• Tests will be performed with NO vacuum

Next Ste xt Step: R p: RF T F Test st

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Tuner instrumentation in the MTA

• Can we use the same instrumentation in the

MTA?

• Can linear potentiometer sit inside vacuum

vessel?

Next Ste xt Step: R p: RF T F Test st

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VESSEL AND CAVITY SHARE SAME VACUUM PAY ATTENTION TO INSTRUMENT THE CAVITY

Next Ste xt Step: R p: RF T F Test st

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Mass/Charge (AMU/e) 10 20 30 40 50 Partial Pressure (torr)

• 10

10

• 9

10

• 8

10

• 7

10

• 6

10

RGA Baseline and Potentiometer RGA Baseline and Potentiometer

Potentiometer Vacuum Potentiometer Vacuum test: test:

• Potentiometer placed in

a vacuum test stand

• Vacuum is degraded

from 10-7 torr to 10-6 torr with the potentiometer

• Pump down time much

longer (Hours vs minutes)

Baseline Baseline Potent

• tentiometer

iometer

Next Ste xt Step: R p: RF T F Test st

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Mass/Charge (AMU/e) 10 20 30 40 50 Partial Pressure (torr)

• 10

10

• 9

10

• 8

10

• 7

10

• 6

10

RGA Baseline and Potentiometer RGA Baseline and Potentiometer

Potentiometer Vacuum Potentiometer Vacuum test: test:

• Potentiometer placed in

a vacuum test stand

• Vacuum degraded from

10-7 to 10-6 with the pontentiometer

• Pump down time much

longer (Hours vs minuets)

Baseline Baseline Potent

• tentiometer

iometer

No linear pot into the vacuum vessel during operation. Operation will rely on previous tests

Conc

• nclusion

lusion

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• Actuators have been tested and have a

good response

• RF measurements will be done early in

August,in lab 6.

• Test in lab 6 will be done with linear

potentiometers but no vacuum

Many Thanks

To MAP and INFN for this

• pportunity

Thank you

For your attention!

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Pressure (PSI) 10 20 30 40 50 60 70 80 Frequency (kHz)

• 100
• 80
• 60
• 40
• 20

20 40 60 80 100

/ ndf

• 0.4719 / 7

p0 1.428 ±

• 0.6332

p1 0.0247 ± 1.143 / ndf

• 0.4719 / 7

p0 1.428 ±

• 0.6332

p1 0.0247 ± 1.143

Piston 5 - Mean

/ ndf

• 0.3708 / 7

p0 1.432 ±

• 1.931

p1 0.02779 ±

• 1.003

/ ndf

• 0.3708 / 7

p0 1.432 ±

• 1.931

p1 0.02779 ±

• 1.003

Frequency: Frequency:

• Computed using the

results of the OLD prototype

• 45.2 kHz/mm

Gr Group B

• up Beha

haviour viour

Luca Somaschini - INFN Pisa 42 Piston Number 1 2 3 4 5 6 Slope (kHz/PSI) 1.05 1.1 1.15 1.2 1.25

Frequency - Squeeze

• P vs

/ ndf

2

• 0.275 / 5

p0 0.01003 ± 1.149 / ndf

2

• 0.275 / 5

p0 0.01003 ± 1.149

Frequency - Squeeze

• P vs

Gr Group B

• up Beha

haviour viour

Luca Somaschini - INFN Pisa 43 Piston Number 1 2 3 4 5 6 Slope (kHz/PSI)

• 1.1
• 1.05
• 1
• 0.95
• 0.9

Frequency - Stretch

• P vs

/ ndf

2

• 1.975 / 5

p0 0.009213 ±

• 1.022

/ ndf

2

• 1.975 / 5

p0 0.009213 ±

• 1.022

Frequency - Stretch

• P vs

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Pressure (PSI) 10 20 30 40 50 60 70 80 Frequency (kHz)

• 250
• 200
• 150
• 100
• 50

50 100 150 200 250

/ ndf

• 0.4693 / 7

p0 3.192 ±

• 1.38

p1 0.05506 ± 2.529 / ndf

• 0.4693 / 7

p0 3.192 ±

• 1.38

p1 0.05506 ± 2.529

Actuator 5 - Mean

/ ndf

• 0.3741 / 7

p0 3.151 ±

• 4.252

p1 0.06124 ±

• 2.22

/ ndf

• 0.3741 / 7

p0 3.151 ±

• 4.252

p1 0.06124 ±

• 2.22

Frequency: Frequency:

100 kHz/mm

Gr Group B

• up Beha

haviour viour

Luca Somaschini - INFN Pisa 45 Actuator Number 1 2 3 4 5 6 Slope (kHz/PSI) 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8

Frequency - Squeeze

• P vs

/ ndf

2

• 0.275 / 5

p0 0.02218 ± 2.541 / ndf

2

• 0.275 / 5

p0 0.02218 ± 2.541

Frequency - Squeeze

• P vs

Gr Group B

• up Beha

haviour viour

Luca Somaschini - INFN Pisa 46 Actuator Number 1 2 3 4 5 6 Slope (kHz/PSI)

• 2.5
• 2.45
• 2.4
• 2.35
• 2.3
• 2.25
• 2.2
• 2.15
• 2.1
• 2.05
• 2

Frequency - Stretch

• P vs

/ ndf

2

• 1.975 / 5

p0 0.02038 ±

• 2.26

/ ndf

2

• 1.975 / 5

p0 0.02038 ±

• 2.26

Frequency - Stretch

• P vs