β=0.90 & β=0.92 Helium Vessel Design - INDICO-FNAL (Indico) · 2019-02-01 · 5. The Helium...

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In partnership with: India/DAE Italy/INFN UK/STFC France/CEA/Irfu, CNRS/IN2P3 β=0.90 & β=0.92 Helium Vessel Design Vikas Kumar JAIN, SCDD, RRCAT, Indore PIP-II β=0.90 & 0.92 Jacketed Cavity FDR 1 February 2019

Transcript of β=0.90 & β=0.92 Helium Vessel Design - INDICO-FNAL (Indico) · 2019-02-01 · 5. The Helium...

Page 1: β=0.90 & β=0.92 Helium Vessel Design - INDICO-FNAL (Indico) · 2019-02-01 · 5. The Helium vessel design has to support effective magnetic shield and to avoid mag. field penetration

In partnership with:

India/DAE

Italy/INFN

UK/STFC

France/CEA/Irfu, CNRS/IN2P3

β=0.90 & β=0.92 Helium Vessel Design

Vikas Kumar JAIN, SCDD, RRCAT, Indore

PIP-II β=0.90 & 0.92 Jacketed Cavity FDR

1 February 2019

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Outline

• Dressed HB 650 Cavity Description

• Similarities and differences in b = 0.9 &

b = 0.92 Helium Vessel and Cavity

• Helium vessel requirements for HB650 cavity

• Code applicability and analysis

• FEM analysis

• Joint design for helium vessel

• Summary

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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Dressed HB 650 Cavity Description

Dressed cavity consists of following

components:-

1. Bare cavity

2. Helium vessel

• Long Cylinder

• Support lugs

• Lifting lugs

• Helium inlet

• 2-phase pipe assembly

• Tuner mounting lugs

3. Bellow assembly

4. FP transition spool

5. MC transition spool

6. Main Coupler assembly (external)

7. Field Probe Assembly (external)

8. Bellow restrain (Safety Bracket)/

Tuner (external)

9. Magnetic shielding (external)

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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Similarities and differences in b = 0.9 & b = 0.92 Helium Vessel

and Cavity

b = 0.9 b = 0.92 Similarities

1. ID & OD same (440 mm & 450

mm)

2. Same supporting lug gap

3. Identical tuner lug location

4. Helium inlet stubs & 2-phase pipe

is same

5. Similar Magnetic shielding

Differences

1. Length for b = 0.92 is more

2. Cavity stiffness of b = 0.92 is 1/5th of b = 0.9

3. Bellow position nominal dia is different

4. End groups are different

5. Tuner support for b = 0.9 needs additional

attachment

6. Beam tube dia. Is different

650 MHz b = 0.9 & b = 0.92 Dressed Cavity

Cross-section

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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Helium vessel requirements for HB650 cavity

1. The Helium vessel shall be fabricated from a material which should not stress

the cavity upon cool-down. Titanium Gr2 is most common material for

this purpose.

2. The Helium vessel shall be designed to house a 2 K helium bath sufficient to

remove up for CW dissipated power, with appropriately sized supply and

return piping. For HB650 it is 32.5 watts for CW dissipated power

3. It must meet the requirements of the Fermilab ES&H Manual for cryogenic

pressure vessels (as per code) and be rated at an MAWP (Maximum

Allowable Working Pressure). MAWP at HB650 is 2.05 bars at room

temperature and 4.1 bar at 2 K

4. Every effort should be made to minimize the weight and physical size of the

helium vessel in all dimensions. Economy

5. The Helium vessel design has to support effective magnetic shield and to

avoid mag. field penetration to the cavity Proper Magnetic shielding

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Code applicability and analysis Code analysis is intended to demonstrate that the PIP-II SRF cavities conform to the ASME Boiler and

Pressure Vessel Code (the Code), Section VIII, Div. 1, to the greatest extent possible. Where Div. 1

formulas or procedures are prescribed, they are applied to this analysis.

For those cases where no rules are available, the provisions of Div. 1, U-2(g) are invoked.

However, SCRF cavities (helium vessel) does not comply with Div. 1 of the Code in the following ways:

• Category B joints in titanium must be either Type 1 butt welds (welded from both sides) or Type 2 butt

welds (welded from one side with backing strip) only (see Div. 1, UNF- 19(a)).

Some category B (circumferential) joints are Type 3 butt welds (welded from one side with no backing

strip).

• All joints in titanium vessels must be examined by the liquid penetrant method. (see Div. 1,

UNF-58(b)).

No liquid penetrant testing are performed on the vessel.

• All electron beam welds in any material are required to be ultrasonically examined along their entire

length. (see UW-11(e)).

No ultrasonic examination are performed on the vessel.

Stress Analysis Approach Internal/External Pr. Load Thermal Contraction Load Tuner Extension

Helium Vessel UG-27/UG-28 U-2(g) U-2(g)

U-2(g) is satisfied in this analysis by the application of the design-by-analysis rules of the Code,

Section VIII, Div. 2, Part 5.

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FEM Simulations

Loadings

The cavity is subjected to following loads:

1. Gravity

2. LHe liquid head

3. Thermal contraction due to 2K

4. Tuner extension (cavity compression)

5. Pressure (internal and external)

Load

Case Loads

Condition

Simulated

Applicable

Temperatur

e

Applicable

Stress

Catego

ries

1

Gravity

P1 = 2.05 bar

P2 = P3 = 0 Warm Pressurization 293 K

Pm, PL, Q,

Pm + Pb , PL

+ Q

2

Gravity

Liquid Helium

head

P1 =4.1 bar

P2 = P3 = 0

Cold operation, full

LHe, maximum

pressure – no thermal

contraction

2 K

Pm, PL, Q,

Pm + Pb , PL

+ Q

3

Cool down to 2 K

Tuner extension

of 1.5 mm *

(Cavity

compressed

by 1.5 mm)

Cool down and tuner

extension, no primary

loads

2 K

Q

4

Gravity

Liquid Helium

head

Cool down to 1.88 K

Tuner

extension

of 1.5 mm

P1 = 4.1 bar

P2 = P3 = 0

Cold operation, full

LHe inventory,

maximum pressure –

primary and secondary

loads

2 K Q

5

Gravity

P1 = 0

P2 = P3 = 1 bar

Insulating and beam

vacuum upset, helium

volume evacuated

293 K

Pm, PL, Q,

Pm + Pb , PL

+ Q

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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X = 0

Y = 0

Z = 0

X = 0

Y = 0

Y = 0

Z = 0 Y = 0

MC End

FP End

Boundary Conditions

X = Radial/ Transverse Y = Vertical Z = Axial

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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SCL on Cells, end groups and Helium Vessel For b = 0.9& 0.92 Cavities

Helium Vessel

b = 0.9

b = 0.92

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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Material SCL

Membra

ne

Stress

MPa

Classificat

ion Ratio

NbTi-Ti 6 4.32 Pm 0.05

NbTi-Ti 15 1.11 Pm 0.01

Ti 16 1.46 Pm 0.02

Ti 17 31.6 Pm 0.32

Ti 18 19.95 Pm 0.20

Ti 19 51.98 Pm 0.88

Ti 20 18.93 Pm 0.32

Ti 21 5.41 Pm 0.09

Ti 22 2.62 Pm 0.04

Material SCL

Membrane

Stress

+Bending

MPa

Classificatio

n Ratio

NbTi-Ti 6 6.88 Pm+Pb 0.05

NbTi-Ti 15 5.26 Pm+Pb 0.04

Ti 16 17.05 Pm+Pb 0.19

Ti 17 43.11 Pm+Pb 0.29

Ti 18 141.1 Pm+Pb 0.95

Ti 19 82.9 Pm+Pb 0.93

Ti 20 37.30 Pm+Pb 0.42

Ti 21 6.28 Pm+Pb 0.07

Ti 22 5.13 Pm+Pb 0.06

LC1 for Jacking Locations For b = 0.92 Cavity

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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LC1 for Jacking Locations For b = 0.9 Cavity

Material SCL Membrane Stress

Pm (MPa) Ratio

NbTi-Ti 10 2.8 0.05

Ti 11 3.5 0.06

Ti 12 0.63 0.01

Ti 13 0.6 0.01

Ti 14 17.4 0.18

Ti 15 27.2 0.46

Ti 16 20.3 0.34

NbTi-Ti 17 11.5 0.19

Material SCL

Membrane Stress

+ Bending

stresses Pm

+Pb (MPa)

Ratio

Nb-NbTi 5 6.8 0.30

NbTi-Ti 10 5.7 0.06

NbTi-Ti 11 4.05 0.05

Ti 12 1.85 0.02

Ti 13 11.5 0.13

Ti 14 188.6 1.26

Ti 15 29.4 0.33

Ti 16 24.2 0.27

NbTi-Ti 17 23.1 0.26

Similarly LC2 to LC5 were checked and found within limit for both

cavities for jacketed location.

Bellow location -14 re-examined for b=0.9 and it is recommended

to go for reduced MAWP instead of 2.0 bar at room temperature.

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The elastic analysis for following types of

failure:

• Buckling – protection is assured by demonstrating the

appropriate factor of safety on the critical linear (Euler)

buckling load (Part 5, Section 5.4)

• Cyclic failure (fatigue) – protection is assured by

showing that a fatigue analysis is not necessary for the

design conditions (Part 5, Section 5.5.6)

• Cyclic failure (ratcheting) – protection is assured by

compliance with secondary stress limits (Part 5, Section

5.5.6)

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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• Joint design is common for both 0.92 & 0.9 cavity in the helium vessel

• There are two categories of joints in the vessel:-

Non-vacuum boundary joints (10 Nos.) on vessel

Tuner Lug

Support lug

Lifting lug

Vacuum boundary joints

Penetration in the vessel

• Helium inlet lines

• 2-phase pipe welding

Helium vessel to transition spools

• FP end

• MC end

Joint design for helium vessel

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain

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Non-Vacuum boundary Joints

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Vacuum Boundary Joints

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650 MHz b = 0.9 &0.92 Helium Vessel End Joints

β=0.90 & β=0.92 Helium Vessel Design - Vikas

Kumar Jain

01-Feb-2019

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Summary

Both b = 0.9 & b=0.92 Helium vessel are designed & analyzed as

per code.

b = 0.9 cavity is stiff hence the tuning stroke was limited which

call for a tighter control of frequency.

b = 0.9 cavity recommended for reduced MAWP at room

temperature due to higher stresses in bellow.

For all load cases are examined for both types of jackets are

found satisfactory, other issues like fatigue, ratcheting etc. are

also examined.

All weld requires joint qualification as per code. (Discussed in the

dressed cavity review).

01-Feb-2019 β=0.90 & β=0.92 Helium Vessel Design - Vikas Kumar Jain