PEP-II Vacuum p1

New HER IR Vacuum ChambersNew HER IR Vacuum ChambersNew HER IR Vacuum ChambersNew HER IR Vacuum Chambers

Machine Advisory Committee MeetingMachine Advisory Committee MeetingDecember 14, 2004December 14, 2004

Presented by Rodd PopePresented by Rodd Pope

Machine Advisory Committee MeetingMachine Advisory Committee MeetingDecember 14, 2004December 14, 2004

Presented by Rodd PopePresented by Rodd Pope

PEP-II Vacuum p2

New HER IR VacuumNew HER IR VacuumChamber TeamChamber Team

Q4R/Q5R – Don Arnett & Albert ShengQ4R/Q5R – Don Arnett & Albert Sheng

Q4L/Q5L – Ted Osier & Rodd PopeQ4L/Q5L – Ted Osier & Rodd Pope

Q4/Q5 Bellows - Nadine Kurita & Manuel TrigosQ4/Q5 Bellows - Nadine Kurita & Manuel Trigos

Support from Ho DongSupport from Ho Dong

Managed by Nadine KuritaManaged by Nadine Kurita

PEP-II Vacuum p3

LocationLocation

BSC & Luminosity Stay ClearBSC & Luminosity Stay Clear

Synchrotron Radiation & Heat LoadingSynchrotron Radiation & Heat Loading

Beam Position MonitorsBeam Position Monitors

SupportsSupports HER Q4/Q5 Bellows Module

NEG Antechamber ScreenNEG Antechamber Screen

Design and FabricationDesign and Fabrication

Milestone ScheduleMilestone Schedule

OutlineOutline

PEP-II Vacuum p4

HER Q5L – Q4L & Q4R – Q5RHER Q5L – Q4L & Q4R – Q5R

PEP-II Vacuum p5

HER- Downstream, “Forward”, “Right”

HER- Upstream, “Backward”, “Left”

IPQ2RQ4RQ5RFrangible LinkHigh-Power Dump

IP Q2L Q4L Q5L Frangible Link

“Luminosity Chamber”

10MCollimator

19.5M

9.4M 8.4M5.7M

3.6M2.3M

2.3M3.6M

5.7M7.7M 8.5M 10.1M 11.4M

0.0 M

0.0 M

e-

PEP-II Vacuum p6

Design SpecificationDesign SpecificationBeam ParametersBeam Parameters

Maximum HER beam energy/current:Maximum HER beam energy/current: 9 GeV at 2.2 Amps “Farther Future” per M.

Sullivan

Maximum LER beam energy/current:Maximum LER beam energy/current: 3 GeV at 4.5 Amps

Beta *s for HER & LERBeta *s for HER & LER Beta x* = 28 cm

Beta y* = 7 mm “Farther Future” per M. Sullivan

Emittances for HER & LEREmittances for HER & LER Emittance x = 60 nm-rad

Emittance y = 24 nm-rad

PEP-II Vacuum p7

Beam Stay ClearBeam Stay Clear

Beam Stay-ClearBeam Stay-Clear HER BSC: +/- 12x x 9y

Luminosity Cone: 6.24

BSC through Q2R isBSC through Q2R is +/- 12x x 8.5y

Q2L Outboard FlangeLooking Toward IP12x x 9y BSC

6.24 Luminosity Cone

PEP-II Vacuum p8

Q4 HER BSCQ4 HER BSCOutboard Magnet End Looking Toward IPOutboard Magnet End Looking Toward IP

Q4L Q4R12x x 9y BSC

Luminosity Cone (6.24)~90% Clear

PEP-II Vacuum p9

Q5 HER BSCQ5 HER BSCOutboard Magnet End Looking Toward IPOutboard Magnet End Looking Toward IP

Q5L Q5R12x x 9y BSC

Luminosity Cone (6.24)~85% Clear

PEP-II Vacuum p10

Luminosity Clear RayLuminosity Clear Ray

BSC

Luminosity

Limiting Aperture is Frangible Link-Green Line Represents Clear Aperture-Green Line Clears Q5L & Q4L

Q5L Frangible Link LuminosityChamber

PEP-II Vacuum p11

SR, ISR, I22R & HOM Heat LoadsR & HOM Heat Loads

HER @ 9 GeV at 2.2 AmpsHER @ 9 GeV at 2.2 Amps

LER @ 3 GeV at 4.5 AmpsLER @ 3 GeV at 4.5 Amps

HOM & IHOM & I22R Engineering Guess = 269 W/mR Engineering Guess = 269 W/m Re-analyze at 1 kW/m (worst case estimate)

10% Reflected SR Power10% Reflected SR Power

PEP-II Vacuum p12

Heat Load SummaryHeat Load Summary

Q5R May Intercept B1L & B1R High Power SR Q5R May Intercept B1L & B1R High Power SR During Mis-steerDuring Mis-steer

Actively Safe Chamber (TC Interlocked)

Uniform Heating from HOM and I2R Loads

Balanced Cooling to Minimize Dynamic (Thermal) Bowing

Q5L & Q4L Intercepts B3, B2 & BLF HER SRQ5L & Q4L Intercepts B3, B2 & BLF HER SR Distribute SR Power Over H20 Cooled, Aluminum Chamber Wall

Distributed Masks Allow Larger BSC than Discrete Masks

Balanced Cooling to Minimize Dynamic (Thermal) Bowing

PEP-II Vacuum p13

Q4R SR Ray Tracing

Looking Toward the IP

e-

•Q4R is clear.

Q4R

PEP-II Vacuum p14

Q5R Beam Missteering Location

65 inches

e-

Q5R

B1 SRLooking upbeam

•Add additional cooling channels to eliminate uncertainty of HOM induced thermal gradient within missteering region.

•It is the worst case when B1 (R) and B1 (L) SR strike at the same spot.

•Active safe when using thermocouple to detect transient temperature rise.

PEP-II Vacuum p15

Locations of Thermocouples

Possible missteering area Combined 0.5 mrad horizontal and 1 mrad

vertical mis-steering.

B1(L)

B1( R)

Looking upbeam

Water channel

Water channel

Thermocouples, 1/8” deep,

3/8” equal spacing

PEP-II Vacuum p16

Transient Analysis due to Beam Missteering

PEP-II Vacuum p17

Transient Analysis due to Beam Missteering

Trip stress = 25ksidTmax = 97 C

Trip stress = 30ksidTmax=116 C

dT at thermocouple = 14 C

dT at thermocouple = 30 C

PEP-II Vacuum p18

LER SR Into Q4L HERLER SR Into Q4L HER

LER SR Thru Q4L IBF(0.5 mrad horizontal & 1.0 mrad vertical mis-steer)

-36

-26

-16

-6

4

14

24

34

-10 0 10 20 30 40 50 60 70

Chamber X Aperature (octagon)

Ch

amb

er Y

Ap

erat

ure

(o

ctag

on

)

• Plot Frame Represents Chamber Walls

• B1L & B1R SR Rays

PEP-II Vacuum p19

LER SR Through Q45L HER BellowsLER SR Through Q45L HER Bellows

LER SR Thru Bellows Fingers(0.5 mrad horizontal & 1.0 mrad vertical mis-steer)

-52

-32

-12

8

28

48

-56 -36 -16 4 24 44 64 84 104

Chamber X Aperature (octagon)

Ch

amb

er Y

Ap

erat

ure

(o

ctag

on

)

• Plot Frame Represents Chamber Walls

• All B1L & B1R Rays

PEP-II Vacuum p20

LER SR Through Q5LLER SR Through Q5LLER SR Thru Q5L OBF

(0.5 mrad horizontal & 1.0 mrad vertical mis-steer)

-40

-30

-20

-10

0

10

20

30

40

-72 -22 28 78 128

Chamber X Aperature (rectangular)

Ch

amb

er Y

Ap

erat

ure

(re

ctan

gu

lar)

• Plot Frame Represents Chamber Walls

• All B1L & B1R Rays

PEP-II Vacuum p21

Q5L HER ChamberQ5L HER Chamber

Chamber analyzedChamber analyzed 0 W of LER SR

2560 W of HER SR (B3, B2, BLF)

269 W/m HOM (517 W)

TTmaxmax = = 36 C36 C

max = 13 KSI (combined thermal and mechanical stress).

Re-analyze with 1 kW/m Re-analyze with 1 kW/m HOM, 10% reflected power HOM, 10% reflected power and displacement loads and displacement loads from installation and from installation and manufacturing tolerances.manufacturing tolerances.

PEP-II Vacuum p22

Q4L HER ChamberQ4L HER Chamber

Chamber analyzedChamber analyzed 0 W of LER SR 591 W of HER SR (B3, B2,

BLF) 269 W/m HOM (430 W)

TTmaxmax = 2 = 25 C5 C max = 3.7 ksi (combined

thermal and mechanical stress).

Re-analyze in 3D with Re-analyze in 3D with 1kW/m HOM, 10% 1kW/m HOM, 10% reflected power and reflected power and displacement loads displacement loads from installation and from installation and manufacturing manufacturing tolerances.tolerances.

PEP-II Vacuum p23

Thermal and Mechanical Loading

•Temperature, thermal induced deformation and stress:Q4R Q5R

HOM = 268 w/m HOM = 1 kw/m HOM = 268 w/m HOM = 1 kw/m

Max. Temperature (C ) 10 43 5 20

Max. x deformation (inch) 0.002(out) 0.007(out) 0.008(out) 0.010(out)

Max. y deformation (inch) 0.006(in) 0.005(in) 0.023(in) 0.02(in)

Overall z deformation (inch) 0.020 0.086 0.013 0.05

Max. effective stress (psi) 5520 5540 8916 9400

Q4R Q5R

vacuum

HOM + I2R HOM + I2R

Max. y deformMax. y deform

vacuum

Max. x deformMax. x deform

*On may conclude that overall chamber deformation and stress are vacuum force dominated.

PEP-II Vacuum p24

Beam Position MonitorsBeam Position Monitors

2 Sets of 4 PEP LER Arc Type, Bolt-in BPM’s2 Sets of 4 PEP LER Arc Type, Bolt-in BPM’s

No Additional Sets are Being AddedNo Additional Sets are Being Added

Located Immediately Outboard of Q4 and Q5 Located Immediately Outboard of Q4 and Q5 MagnetsMagnets

Chamber Geometry to Optimize BPM Signal-to-Chamber Geometry to Optimize BPM Signal-to-Noise RatioNoise Ratio

Supporting Chamber at BPM location to the Supporting Chamber at BPM location to the MagnetMagnet

Bellows allows locking Q5 BPM’s in ZBellows allows locking Q5 BPM’s in Z Increases accuracy and stability

PEP-II Vacuum p25

Beam Position Monitor (BPM)

Q5L looking downbeam

Q4R looking downbeam

e-e-

PEP-II Vacuum p26

Old Design

Q4RQ5R

Q2R

Q4R s1Q5R s1

Supports

e -

Q4RQ5R

4” bellow

Q2R

Q4R s1Q5R s1

Q5R s2

BPM

New Design

BPM

PEP-II Vacuum p27

Support Degrees of FreedomSupport Degrees of Freedom

New Design: 8 free DOF x y z pitch yaw roll

  ux uy uz rotx roty rotz

Q2L/Q4L HER x x x x x x

Q4L/Bellows HER x x       x

Bellows/Q5L HER x x       x

Q5L/Frangible Link HER x x x     x

Old Design: 3 free DOF x y z pitch yaw roll

  ux uy uz rotx roty rotz

Q2/Q4 HER x x x x x x

Q4/Q5 HER x x   x x x

Q5L/Frangible Link HER x x     x x

"x" designates a fixed constraint

PEP-II Vacuum p28

SupportsSupports

Addition of Bellows Increases Degrees of Addition of Bellows Increases Degrees of FreedomFreedom

Fix Q5 HER Chambers in X, Y & Z at BPMFix Q5 HER Chambers in X, Y & Z at BPM

Isolate Any Thermal Induced Loads in Q5Isolate Any Thermal Induced Loads in Q5

Reduce Any Thermal Induced Loads in Q4Reduce Any Thermal Induced Loads in Q4

PEP-II Vacuum p29

Q4/Q5 Bellows ModuleQ4/Q5 Bellows Module

Q4 side, 10” Q4 side, 10” flangeflange

Q5 side 12” Q5 side 12” flangeflange

GlidCop GlidCop StubStub

Inconel Inconel Spring Spring FingerFinger

GlidCop RF GlidCop RF Shield Shield FingerFingerWelded Welded

BellowsBellows

Cooling – not Cooling – not shownshown

Absorbing Absorbing TileTile

HER arc bellows concept + absorbing tile in bellows cavity.

Nadine to discuss in detail.

PEP-II Vacuum p30

Q5 HER NEG Anti-chamber ScreenQ5 HER NEG Anti-chamber Screen

New Screen DesignNew Screen Design 3 mm diameter holes

through 6 mm thick wall on a 4 mm center-to-center square pattern

Isolate NEG Wafers from HOM Power Allowing Net Pump versus Net Outgassing

Effective Pumping 695 L/s

PEP-II Vacuum p31

Basic Chamber DesignBasic Chamber Design(Q5L HER Shown)(Q5L HER Shown)

Machined, WeldedAluminum Clamshells

PEP LER Arc Type BPM’s

NEG Assembly with Heater Rod(Q5R and Q5L HER Only)

Variable Wall Thickness to BalanceStrength, Magnet Clearance andBeam Clearance

Explosion BondedAl to SST Flanges

Machined PumpScreen

PEP-II Vacuum p32

StatusStatus All Chambers through Preliminary Design ReviewAll Chambers through Preliminary Design Review

All Driving Requirements Have Been IdentifiedAll Driving Requirements Have Been Identified

Preparing Drawings for Long Lead ItemsPreparing Drawings for Long Lead Items

Preliminary Machined Half Estimates ReceivedPreliminary Machined Half Estimates Received

Completing Final Analysis to Support Final Completing Final Analysis to Support Final Design ReviewDesign Review

PEP-II Vacuum p33

Milestone ScheduleMilestone Schedule

Final Design Review – 1/05

Order Long Lead Items – 1/05

Complete Piece Part Drawings - 3/05

Procurements - 3/05

Receive Long Lead Items – 4/05

Receive components, inspection - 6/05

Weld/assemble, Clean and Bake - 7/05

Chambers Ready for Installation - 9/05

End of PresentationEnd of Presentation

PEP-II Vacuum p35

Q5L BPM SectionQ5L BPM Section(looking toward IP)(looking toward IP)

PEP-II Vacuum p36

Q4/5L Clear Luminosity RayQ4/5L Clear Luminosity Ray

Q4L MagnetQ5L Magnet

CorrectorMagnet

Limiting Aperture is Frangible Link-Green Line Represents Clear Aperture-Green Line Clears Q5L & Q4L

PEP-II Vacuum p37

Installation and ServicingInstallation and Servicing

Final alignment in tunnel vacuum chamber Final alignment in tunnel vacuum chamber tolerances are:tolerances are:

Local alignment (4 chambers TBD) X- and Y-tolerance = ± 125 m (.005"). Z-tolerance = ± 1.5 mm (.098"). Pitch and Yaw = ± 1.0 mrad (.06°).

Global alignment X- and Y-tolerance = ± 250 m (.009").

Q4 to Q5 chamber X or Y offset across Bellows Q4 to Q5 chamber X or Y offset across Bellows Module < 0.05".Module < 0.05".

Absolute accuracy of chamber manufacturing Absolute accuracy of chamber manufacturing tolerancestolerances

± 2 mm full width in X (TBD) ± 2 mm full height in Y (TBD)

PEP-II Vacuum p38

Q4 & Q5 Vacuum Chamber RequirementsQ4 & Q5 Vacuum Chamber Requirements Improve alignment and thermal motion of Improve alignment and thermal motion of

chambers. chambers. Maintain gap between chamber and magnet

2 mm minimum between chamber and pole tip, 3 mm minimum between chamber and coil.

Reduce thermal gradient in chambers Change material to Al with water cooling.

Add bellows Reduces reaction forces on chamber supports/raft from

thermal distortion. Reduces reaction forces on chamber supports/raft from

current design due to manufacturing tolerances (pitch, yaw). Addition of a flex flange would further reduce load on the raft

supports, but space constraints make a new design difficult.

Minimize changes to the raft for support Minimize changes to the raft for support modifications.modifications.

Material Properties

Material Aluminum 6061 T6 Stainless Steel (316L)

Young’s Modules

Poisson Ratio

Thermal Expansion

Conductivity

Yield Stress

Tensile Stress

psi6106.10

33.0

Co/1103.24 6

Ccm

wo

56.1

)6(40 Tksi )4(21 Tksi

)6(45 Tksi )4(35 Tksi

psi6100.28

29.0

Co/1108.17 6

Ccm

wo

163.0

ksi42

ksi81

PEP-II Vacuum p40

BPM’sBPM’s Beam Position Monitors (BPM’s)Beam Position Monitors (BPM’s)

Use spare PEP-II BPMs for Al chambers

One set at the outboard end of Q4 and one set at the outboard end of Q5.

Support the BPM set in x and y. Hold in z only if it doesn’t compromise other requirements.

BPM’s are centered on the beam in the x-direction,

Q5L chamber has a BPM center to BPM center x-direction spacing of 1.875” (R. Johnson, S. Smith (2004).

Q5R & Q4 chambers has a BPM center to BPM center x-direction spacing is TBD.

Place BPM’s on flat surfaces. Avoid transitions.

Keep the BPM’s as far away from any holes and masks (at least 4

to 6”). Buttons recessed .012” +/- .009”

PEP-II Vacuum p41

BPM (cont.)BPM (cont.) Support BPM to Quad magnet

No calibration required – QMS/BBA

BPM electrical centerline positional requirements with respect to quad magnetic centerline:

X- and Y- position absolute offset: ± 0.040".

Z-position absolute accuracy: ± 0.060".

Stability X- and Y- long-term stability (precision): ± 0.001".

3 hour time span - motion due to beam current, diurnal temperature, cooling water temperature, beam off/on hysterisis. Does NOT include drift of electronics.

Z long-term stability (precision): ± 0.010".

X- and Y- short-term stability (precision): ± 0.0005". 1 minute time span - motion due to mechanical vibration of chamber with

respect to quad magnet (not of magnet itself). Does NOT include jitter of electronics.

Z short-term stability (precision): ± 0.005"

PEP-II Vacuum p42

PumpingPumping

PumpingPumping Improve average pressure in the chamber (1 e-9 Torr).

Keep NEG in Q5 HER and maximize pumping conductance within screen dimensions.

Improve the screen to reduce broadband impedance and TE leakage into the pump. New Q5 HER screen dimensions: 3 mm (.118”) diameter holes thru 6 mm thick wall, 4 mm x 4 mm square center-to-center pattern.

Add noble diode ion pump at the outboard end of Q5R (TBD).

Add hot filament gauges, new RGA (TBD).

PEP-II Vacuum p43

Fabrication ToleranceFabrication Tolerance

Chamber length tolerance = ± 0.04"Chamber length tolerance = ± 0.04"

Roll/Twist of chambersRoll/Twist of chambers Max allowable twist flange to flange is 3 mrads. This

corresponds to a 0.020" step between Q4 & Q5 chambers.

Pins in bellows will allow for a 3 mrad of roll offset between flange pairs.

Chambers allow for 3 mrad of twist for manufacturing tolerances without applying an excessive load to the supports.

PEP-II Vacuum p44

SupportsSupports

Q4 inboard flanges supported in x, yy, z by the Q2 chamber Q4 inboard flanges supported in x, yy, z by the Q2 chamber support.support.

Q4 outboard flange supported in xx, y to the raft or magnet? Q4 outboard flange supported in xx, y to the raft or magnet? BPM precision will not be as stable as ones held rigidly. BPM precision will not be as stable as ones held rigidly.

Q5 inboard flange support in xx, y to the raft or magnet; or Q5 inboard flange support in xx, y to the raft or magnet; or supported in xx, y, z.supported in xx, y, z.

Q5 outboard flange support in xx, y, z to the raft or magnet; Q5 outboard flange support in xx, y, z to the raft or magnet; or supported in xx, y. If held rigidly here than BPM stability or supported in xx, y. If held rigidly here than BPM stability is improved. Do we need to improve how the BPM is held is improved. Do we need to improve how the BPM is held here? Should we support to the magnet or to the raft or to here? Should we support to the magnet or to the raft or to the concrete pier?the concrete pier?

Supports utilize rod ends and are fully adjustable in the Supports utilize rod ends and are fully adjustable in the field. UNCfield. UNC

Max X or Y deflection under operational loads = ± xxx"Max X or Y deflection under operational loads = ± xxx" Loading at Base of Support (Technical note, xxxx):Loading at Base of Support (Technical note, xxxx):

PEP-II Vacuum p45

Vacuum PressureVacuum Pressure

Average arc pressure ≤ 3.4 x 10-9 torr (N2 equivalent).Average arc pressure ≤ 3.4 x 10-9 torr (N2 equivalent). Average arc base pressure ≤ 5 x 10-10 torr Average arc base pressure ≤ 5 x 10-10 torr

Peak pressure of any bump in profile = 5 x 10-7 torr (NPeak pressure of any bump in profile = 5 x 10-7 torr (N22 equivalent).equivalent).

Operating parameters:Operating parameters: 9 GeV on 2.2A HEB (CDR, p308) crit = 9.8 keV at 9 GeV beam energy (CDR, p309)

Vacuum Calculation VariablesVacuum Calculation Variables Copper & Aluminum

photo = 2 x 10-6 mol/photon (CDR, p310)

photo = 5 x 10-5 mol/photon (CO, Foerster)

therm = 2 x 10-12 torr-L/cm2-s, scaled with temperature (CDR, p310):

therm = 4.0 x 10-12 @ 35°C (beam off)

therm = 1.04 x 10-11 @ 60°C (beam on)

No detectable gas species above mass 44 - measured by RGA.No detectable gas species above mass 44 - measured by RGA.

PEP-II Vacuum p46

Photodesorption DataPhotodesorption Data

C. Foerster

PEP-II Vacuum p47

PSD (cont.)PSD (cont.)

PEP-II Vacuum p48

Running Parameters/Orbit ErrorRunning Parameters/Orbit Error

Design Running Parameters:Design Running Parameters: Fill time = 6 minutes, minimum, (0 to 3 amps HER or 4.5 amps LER).

Full cycles = 10,000 cycles over 20 years , (0 to 3 amps HER or 4.5 amps LER).

Fill cycles = 200,000 cycles, 80% to 100% current (3 Amps HER or 4.5 amps LER), over 20 years.

Max axial beam orbit distortion/steering error (CDR, p 304)Max axial beam orbit distortion/steering error (CDR, p 304) ± 7 mm in X.

± 3 mm in Y.

Max angle beam orbit distortion/steering error (S. Ecklund). Max angle beam orbit distortion/steering error (S. Ecklund). ± 0.5 mrad in X.

± 1 mrad in Y.

Design using a safety factor of 2 for the bellows and elsewhere when possible.

PEP-II Vacuum p49

Heat LoadingHeat Loading

Synchrotron radiation (SR) power Synchrotron radiation (SR) power Chamber ends, SS flange pairs and bellows stubs must be

shadowed by a nominal and mis-steer SR strike.

The RF Seal fingers and Bellows Module shield fingers need to be shadowed from a nominal SR strike and a mis-steer strike with a safety factor of 2.

Secondary back-scatter from SR. Secondary back-scatter from SR. Assume 10% of SR power is scattered onto chamber walls.

In HER arc dipole magnet, 11.6 % of SR is back-scattered off main strike surface. Outside of the field 12.2 % is back-scattered (FLUKA calculations summary by Al Lisin).

PEP-II Vacuum p50

Goal of the ReviewGoal of the Review

Approval of chamber design specification.Approval of chamber design specification.

Approval of chamber design concept and material Approval of chamber design concept and material selection.selection.

Proceed to final design, final design review and Proceed to final design, final design review and detail drawings.detail drawings.

Approval to procure long lead items.Approval to procure long lead items. GlidCop

Transition material

Bellows

Tiles

PEP-II Vacuum p51

Vacuum ProcessingVacuum Processing

In-situ bakeoutIn-situ bakeout There are no provisions being made for an in-situ bakeout. If one is

necessary a hot water system could be implemented and the chambers will survive a bakeout cycle.

Min chamber temperature during in situ bakeout = 95°C.

Max chamber temperature during in situ bakeout = 100°C.

Chamber lab bake-out temperature 150°C.Chamber lab bake-out temperature 150°C.

Glow discharge or TiN coat aluminum chambers to be Glow discharge or TiN coat aluminum chambers to be determined.determined.

Chambers will be scanned for residual gases using a RGA Chambers will be scanned for residual gases using a RGA Mass Spectrometer. When scanning for mass 1 to mass Mass Spectrometer. When scanning for mass 1 to mass 100 at 150100 at 150C, peaks above mass 44 shall be less than 5 x 1-C, peaks above mass 44 shall be less than 5 x 1-12 Torr, and the sum of all peaks above mass 44 shall be 12 Torr, and the sum of all peaks above mass 44 shall be less than 1 x 10-11 Torr.less than 1 x 10-11 Torr.

Material Properties

Material Aluminum 6061 T6 Stainless Steel (316L)

Young’s Modules

Poisson Ratio

Thermal Expansion

Conductivity

Yield Stress

Tensile Stress

psi6106.10

33.0

Co/1103.24 6

Ccm

wo

56.1

)6(40 Tksi )4(21 Tksi

)6(45 Tksi )4(35 Tksi

psi6100.28

29.0

Co/1108.17 6

Ccm

wo

163.0

ksi42

ksi81

PEP-II Vacuum p53

Water Channels

0.256” square with 0.157” diameter bore cooling channels.

2”

Q4R Q5R

2 x 1/16” x 0.25” Skip weld

PEP-II Vacuum p54

Transient Analysis due to Beam Missteering

e-

Temperature contours at t=1 second

SR 0.7 mrad horizontally mis-steered

SR 1 mrad vertically mis-steered

Power density: 14 W/mm (B1(L) + B1(R))Beam height: 0.6mm

PEP-II Vacuum p55

Transient Analysis due to Beam Missteering

•Note that temperature rise within missteering area due to HOM + I2R

• 16 C (HOM + I2R power density 1Kw/m is used)

•Place few thermocouples, one of the thermocouple will experience temperature rise during beam missteering

•14 C (if max trip stress is 25 ksi, max. temperature rise 97 C ) •30 C (if max trip stress is 30 ksi, max. temperature rise 116 C)

•Assume water temperature

30 C

•Due to uncertainty of HOM power density, Nominal trip temperature is set to be

46 C (30 + 16) (=115 F)

•Maximum trip temperature

60 C (30 + 30) (=140 F)

is used.

PEP-II Vacuum p56

Reaction Forces due to Support ScenarioQ4R + Q5R

Forces (lb) Moments (lb-in)

X Y Z X Y Z

Caused by

1 mrad yaw

1 mrad pitch

Z constraints

1 mrad pitch

1 mrad yaw

1 mrad twist

Q2R 256 153 0 -6488 9503 -1360

Q4R s1 -332 -137 0 0 0 -569

Q5R s1 N/A N/A N/A N/A N/A N/A

Q5R s2 76 70 0 0 0 1930

Net 0 87* 0 -6488 9503 0

*Body force included.

Q2RQ4R S1

Q5R S2

Q4R

Q5R

Q4R + 4” Bellow + Q5R

Reaction Forces (lb) Reaction Moments (lb-in)

X Y Z X Y Z

Caused by

1 mrad yaw

1 mrad pitch

Z constraints

1 mrad pitch

1 mrad yaw

1 mrad twist

Q2R 91 -89 0 5113 5911 1360

Q4R s1 -91 60 0 0 0 -1360

Q5R s1 0 18 0 0 0 3070

Q5R s2 0 38 0 0 0 -3070

Net 0 87* 0 5113 5911 0Q2R

Q4R S1

Q5R S1

Q5R S2

Q4R

Q5R

Bellow

e-

z

x

y