New Fast Wire Scanners in 4L1 and 11L1 - Vacuum outgassing measurements and vacuum pressure...

Friederike Salveter 1

New Fast Wire Scanners in 4L1 and 11L1- Vacuum outgassing measurements and vacuum

pressure simulations –(Friederike Salveter, Jose Antonio Ferreira Somoza, Paul Demarest, Alice Ingrid Michet, Jan Hansen)

2

Layout of the PSB ring

2

Simulation 4L1

Simulation 11L1

Position of the new Wirescanners

3

• Outgassing tests on wire scanner components were conducted in 2013 and 2014 The highest value of the

sum of the measured outgassing

Q10h= 1.34∙10-5 mbar∙l∙s-1

•An outgassing test of an assembled SPS wire scanner was done in 2014:

Outgassing of this Wire scanner:

Q10h= 8.1∙10-5 mbar∙l∙s-1

Pumpdown:

P∝1/t0.5

No contamination observed

=>The tested components don’t explain the outgassing observed

=> Proposal: test all the possible sources (non-metal) before building the next wire scanners

SPS Fast Wire Scanner - Outgassing measurements in 2014

Curtesy of Jose Antonio Ferreira Somoza

4

Tests of the new Fast Wire Scanners components

Component Outgassing, 10h (mbar l s-1)

Pollution

The arm

8.4x10-7 Sulfur

The optical fibre

6.8x10-6 Presence of air

The nut

2.6x10-6 Presence of oil

The ferritesEstimated to 2.0x10-7 None

•The optical fiber has the highest gas load 2 types of optical fibers available

(tested in November 2013) It is recommended to use the

one with the lower outgassing rate

•The sulfur detected in the arm is not acceptable in a vacuum system

•Not all the components that will be installed in the wire scanners have been received for the measurements

Curtesy of Alice Ingrid Michet

5

Ion Pump270 l s-1

Pressure simulation - Current pumping

Beam

Ion Pump270 l s-1

Ion Pump400 l s-1

Beam

Ion Pump400 l s-1

2.5x10-8 1x10-7

1x10-8 3.5x10-8

Pressure Gradient (mbar)

Pressure Gradient (mbar) BR.BHZ 32

Multipole4L1 type A

Corrector4L1 type 1

BR.BHZ 41

BR.BHZ 102

Corrector

11L1 ty

pe 1

Multipole

11L1 ty

pe IIB

BR.BHZ

121

11L1

4L1

Parameter used in the simulation Value Unit

Time 4 Weeks

Outgassing Stainless Steel 2x10-11 mbar l s-1 cm-2

Total outgassing of 1 Wire scanner 1x10-5 mbar l s-1

Current Pumping SpeedIon pump 1 & 2 400 l s-1

Current Pumping SpeedIon pump 3 270 l s-1

Pumping speed Titanium Sublimation Pump (TSP) 1000 l s-1

Simulated Gas N2 -

TSP

TSP

TSP

TSPTSP

TSP

11L2

11L1

10L5

4L2

4L1

3L5

10000 8000 6000 4000 2000 01E-9

2E-9

3E-9

4E-9

5E-9

6E-9

7E-9

p (

mb

ar)

Length (mm)

20_400/400/270 -1- 20_400/400/270 -2- 20_400/400/270 -3- 20_400/400/270 -4- 21_400/400/270_TSP -1- 21_400/400/270_TSP -2- 21_400/400/270_TSP -3- 21_400/400/270_TSP -4-

8000 6000 4000 2000 01E-9

2E-9

3E-9

4E-9

5E-9

6E-9

p (

mb

ar)

Length (mm)

9_400/400/270 -1- 9_400/400/270 -2- 9_400/400/270 -3- 9_400/400/270 -4- 10_400/400/270_TSP -1- 10_400/400/270_TSP -2- 10_400/400/270_TSP -3- 10_400/400/270_TSP -4-

6

Pressure simulation - Current pumping

11L1

4L1

Solid graphs:• No wire scanners• TSPs not sublimated

Dashed graphs:• No Wire scanners• TSPs sublimated

Beam

Beam

BR.BHZ 32

Multipole 4L1Corrector 4L1

BR.BHZ 41

BR.BHZ 102Corrector 11L1

Multipole 11L1

BR.BHZ 121

Manifold 11L2

Manifold 11L1

Manifold 10L5

Manifold 4L2Manifold 4L1

Manifold 3L5

! Due to the amount of simulations only the green slopes will be shown as reference in the following graphs

7

Pressure simulation - with Wire Scanners

Beam

Beam

BR.BHZ 32

Multipole4L1 type A

Corrector4L1 type 1

BR.BHZ 41

BR.BHZ 102

Corrector

11L1 ty

pe 1

Multipole

11L1 ty

pe IIB

BR.BHZ

121

11L1

4L1

11L2

11L1

10L5

4L2

4L1

3L5Outgassing per W

ire sc

anner:

1. 10-5 mbar l

s-1

8

9000 8000 7000 6000 5000 4000 3000 2000 1000 01E-9

1E-8

1E-7

p (

mb

ar)

Length (mm)

2_WS320_400/400/270 -1- 2_WS320_400/400/270 -2- 2_WS320_400/400/270 -3- 2_WS320_400/400/270 -4- 6_WS320_400/400/270_TSP -1- 6_WS320_400/400/270_TSP -2- 6_WS320_400/400/270_TSP -3- 6_WS320_400/400/270_TSP -4- 1_WS000_400/400/270 -1- 4_WS000_400/400/270_TSP -1- 9_400/400/270 -1- 10_400/400/270_TSP -1-

10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 01E-9

1E-8

1E-7

p (

mb

ar)

Length (mm)

20_400/400/270 -1- 21_400/400/270_TSP -1- 22_WS000_400/400/270 -1- 23_WS000_400/400/270_TSP -1- 24_WS320_400/400/270 -1- 24_WS320_400/400/270 -2- 24_WS320_400/400/270 -3- 24_WS320_400/400/270 -4- 25_WS320_400/400/270_TSP -1- 25_WS320_400/400/270_TSP -2-

Pressure simulation - with Wire Scanners

11L1

4L1

Solid graphs:• Wire scanners in place• TSP not sublimated

Dashed graphs:• Wire scanners in place• TSP sublimated

Beam

Beam

BR.BHZ 32BR.BHZ 41

BR.BHZ 102BR.BHZ 121

Wire scanners

Wire scanners

Manifold 11L1

Manifold 4L1

BASELINE without Wire scanners:TSP not sublimated TSP sublimated


With Wire scanners:TSP not sublimated + WSTSP sublimated + WS


+ ca. 1.2 decades!

+ ca. 1.2 decades!

9

Pressure simulation - additional pumping

Beam

Beam

BR.BHZ 32

Multipole4L1 type A

Corrector4L1 type 1

BR.BHZ 41

BR.BHZ 102

Corrector

11L1 ty

pe 1

Multipole

11L1 ty

pe IIB

BR.BHZ

121

11L1

4L1

11L2

11L1

10L5

4L2

4L1

3L5Outgassing per W

ire sc

anner:

1. 10-5 mbar l

s-1

Þ Additional pumps installed on the wire scanner: 1 NEG pump (SAES Nextorr® D-1000-10) at each

wire scanner (320 l s-1 for N2)

4x320 l s-1

4x320 l s-1

10

9000 8000 7000 6000 5000 4000 3000 2000 1000 01E-9

1E-8

1E-7

p (

mb

ar)

Length (mm)

2_WS320_400/400/270 -1- 2_WS320_400/400/270 -2- 2_WS320_400/400/270 -3- 2_WS320_400/400/270 -4- 6_WS320_400/400/270_TSP -1- 6_WS320_400/400/270_TSP -2- 6_WS320_400/400/270_TSP -3- 6_WS320_400/400/270_TSP -4- 1_WS000_400/400/270 -1- 4_WS000_400/400/270_TSP -1- 9_400/400/270 -1- 10_400/400/270_TSP -1-

10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 01E-9

1E-8

1E-7

p (

mb

ar)

Length (mm)

20_400/400/270 -1- 21_400/400/270_TSP -1- 22_WS000_400/400/270 -1- 23_WS000_400/400/270_TSP -1- 24_WS320_400/400/270 -1- 24_WS320_400/400/270 -2- 24_WS320_400/400/270 -3- 24_WS320_400/400/270 -4- 25_WS320_400/400/270_TSP -1- 25_WS320_400/400/270_TSP -2-

Pressure simulation - Wire Scanners & additional pumping

11L1

Beam

Beam

BR.BHZ 41

BR.BHZ 102BR.BHZ 121

Manifold 11L1

Manifold 4L1

BR.BHZ 32



4L1

Solid graphs:• Wire scanners in place• Add. pumping of 320 l s-1 per Wire scanner• TSP not sublimated

Dashed graphs:• Wire scanners in place• Add. pumping of 320 l s-1 per Wire scanner• TSP sublimated



+ ca. 1.2 decades!

+ ca. 1.2 decades!

< 1 decade

< 1 decade

Wire scanners

Wire scanners

11

Summary (pressure after 4 weeks)

Wire scanner Add. Pumping(Wire scanner)

Add. Pumping (Manifold)

Pressure 4L1 (Wire scanner)

Pressure 11L1(Wire scanner)

No NoNo 4.5x10-9 mbar 4.4x10-9 mbar

Sublimation 2.2x10-9 mbar 2.1x10-9 mbar

Yes NoNo 8.0x10-8 mbar 7.9x10-8 mbar


Yes 4x320 l s-1No 2.9x10-8 mbar 3.1x10-8 mbar


> 1 decade!

Conclusion:• With the current high outgassing additional pumping at the wire scanners

is required to meet the vacuum specifications Extra costs (pumps, cabling, controls) Proposal: Use a manifold for 4 Wire Scanners

=> One big pump could be used instead of four small ones• The outgassing of the different components should be reduced whenever

possible

< 1 decade

New Fast Wire Scanners in 4L1 and 11L1 - Vacuum outgassing measurements and vacuum pressure...

Documents

Transcript of New Fast Wire Scanners in 4L1 and 11L1 - Vacuum outgassing measurements and vacuum pressure...