run ii status and prospects - spalding1 run ii status and prospects jeff spalding fermilab june 14,...

Run II Status and Prospects - Spalding 1

Run II Status and ProspectsRun II Status and Prospects

Jeff SpaldingFermilab

June 14, 2004


ContentsContents

Introduction Major elements of the Run II “campaign” Present performance Status of the upgrade projects Luminosity projection Summary


Run II goal: maximize integrated luminosity delivered to CDF & Run II goal: maximize integrated luminosity delivered to CDF & D0 …D0 …


… … with a program of upgrades throughout the complexwith a program of upgrades throughout the complex

Recycler Ring


Basis for the Plan: What drives the luminosityBasis for the Plan: What drives the luminosity

Peak Luminosity

Luminosity lifetime (tunes, beam-beam interactions)

Reliable Operation

p, pbar, form factor F, * provide some gains

But major improvements from bunch intensities

especially total number of pbars BNpbar, (B=36 bunches for Run II) proton brightness (Np/p) is constrained by beam-beam tune shift


Major Elements of the Run II CampaignMajor Elements of the Run II Campaign


Operational improvements and upgrade projectsOperational improvements and upgrade projects

Near Term (and ongoing) Improved reliability and operating efficiency

Failure modes, abort system improvements… Tevatron alignment Improved instrumentation throughout the complex

Optimization of transfers, improved optics and helices in Tevatron

Upgrade Projects Increase pbar production

Slip stacking Pbar acceptance upgrade Stacking rate and stack size (stacktail, Recycler, e-cooling)

Upgrade Tevatron for higher bunch intensities Helix TEL: active beam-beam compensation


ReliabilityReliability

The number of store hours per week is up 27% from FY03 - the TEV is a more reliable machine.

Typical store length 15 hrs last year >24 hrs now

Due to: Alignment of the TEV

• Dipole un-rolls, Low Beta alignment, Smart bolt retrofit Reliability strategy

• Aggressively pursue equipment failures– Individual components and Systems (e.g. TEV abort

system) Operations strategy

• With improved reliability run long stores– More time to ensure large stack size– Minimize the effects of store turnaround time– Minimize impact of parasitic studies

• Short focused dedicated studies– Configuration control


Dynamic plan – adjust the strategy when new information from operations and project R&D

Major Elements

Increase number of protons on the pbar production target Slip stacking (5E12 >8E12 protons on pbar target) Upgrade the target itself to handle higher intensity

Increase antiproton collection Increase the gradient of the antiproton collection lens Increase the aperture of the antiproton collection transfer

line (AP2) and the Debuncher ring. Increase the antiproton stacking and storing capabilities

Increase the flux capability of the Accumulator stacktail stochastic cooling system.

Use the Recycler as a second antiproton storage ring, with both stochastic and electron cooling

Upgrade Tevatron to handle higher intensity bunches. Improvements to helix separation and smoothness Active compensation for beam-beam tune shift using the

TEL

Upgrade ProjectsUpgrade Projects


Status of OperationsStatus of Operations

Run I


Status: Integrated LuminosityStatus: Integrated Luminosity

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50

100

150

200

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300

0 30 60 90 120 150 180 210 240 270 300 330 360 390

Days Since June 1

Inte

grat

ed L

umin

osity

(pb

-1)

6/03 - 6/04

6/02 - 6/03

FY04 Design

FY04 Base

Up 55% with 14% fewer scheduled running weeks

Average integrated luminosity per week is up 80%

Compare the last 12 months to the year before


Status: Peak LuminosityStatus: Peak Luminosity

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0 30 60 90 120 150 180 210 240 270 300 330 360 390

Days Since June 1

Pe

ak

Lu

min

osi

ty ( b

-1/s

ec)

6/03 - 6/04

6/02 - 6/03

FY04 Design

FY04 Base

Current best = 7.6E31 cm-2s-1

*


Summary of Current OperationsSummary of Current Operations

Booster running at record intensities Major improvements in transfer efficiencies and emittances,

TEV tunes, optics and helix Improved reliability and operations allows longer stores

larger stacks higher luminosity

However, stacking rate is ~75% of current goal – present focus of investigation and improvement for the stacktail and core cooling systems

Near term: introduce mixed-source operation (pbars loaded from both Accumulator and Recycler) – first [pilot] store 6/9/04 successful (6.7E31)

And slip-stacking by end of 04 ( already tested at 75% of design intensity) – awaits completion of RF upgrade


Status of the Upgrade ProjectsStatus of the Upgrade Projects


Main InjectorMain Injector

Slip Stacking (goal x1.8ppp on pbar tgt)

Excellent progress Tested @ 6 x 1012 and 1.5 nsec bunch

length on pbar target Reliable operation >8 x 1012 requires

RF upgrade (beam-loading compensation)

On track for end of this year.


Pbar SourcePbar Source

Pbar Acceptance (goal: x2) Lithium Lens (goal x 1.1)

Prototype of new design (higher field gradient) bench test successful AP2 and Debuncher aperture increase (goal x1.8)

Developed procedures for beam-based identification of limiting apertures, identified components to modify

Stacktail cooling upgrade

Cooling system upgrade (extends the bandwith 2-4 2-6 GHz) Requires the large stack to be in Recycler (with e-cool), and “rapid

transfers” Not [easily] reversible

emphasize a phased approach Interim upgrade (05) [NEW]

• Reconfigure existing cooling tanks -quick and reversible• Simulated performance ~30E10 per hr

Full upgrade, with new cooling tanks (06)• Simulated performance ~40E10 per hr


RecyclerRecycler

The Recycler has made excellent progress over the past year Transverse emittance growth is no longer an issue (vacuum problems

solved) Met the performance specs needed for commissioning electron cooling Ready to be integrated into operations (with stochastic cooling)

Provides possibility for interim operating phase [NEW]

Extract pbars from both Accumulator and Recycler: “mixed-source” e.g. 24 bunches from the Accumulator + 12 bunches from the Recycler A few (2-4) interim transfers from Accumulator to Recycler Improves average stacking rate in the Accumulator

Reasons Push Recycler commissioning progress by plunging it into operations Potential luminosity enhancement – more pbars for smaller emittances

• Break-even right now, potential for up to 20% gain in the next year Flexibility in the Run II Upgrade schedule

• Merge more naturally into commissioning electron cooling


Electron CoolingElectron Cooling

R&D program on e-beam is complete, now moving the setup to the Recycler R&D scheduled stretched by ~2 months

NOT BAD!

Operational test of the full system successful All major components, diagnostics and

controls developed and tested Beam properties achieved close to spec

(analysis ongoing)

Will add additional Pelletron section at Recycler reliable operation at 4.3 MeV

Commission e-beam and then pbar cooling in Recycler, parasitic to HEP, then intro e-cooled stacks to HEP (05)

Still R&D (until pbar cooling demonstrated next year), but excellent progress


TevatronTevatron

Major improvements so far Lifetime at 150 GeV

Larger aperture, alignment and dipole un-rolls Emittance dilution reduced

De-coupling at TEV injection, optimization of injection optics

Helix improvements CDF IP

Centered beam in low beta quads (4mm move at CDF), and re-aligned the quadrupoles

New Low Beta Optics 20% increase in luminosity

Upgrades Further alignment improvements in shutdown 04 (and

05) Add separators and polarity switches in shutdown 04

and 05 improved helices


Luminosity ProjectionsLuminosity Projections


Luminosity ProjectionLuminosity Projection

Luminosity model incorporates Performance parameters from simulation, parametric model and

data Long term operating experience

• Sustained average store length was 15 hrs (now >24)• Sustained average 85 store hrs/week (operating weeks often >>100)

Scheduled shutdowns + turn on & recovery + learning slopes

Expect to do better on some parameters, worse on others

What’s new The following plots are from Feb04 DOE review

• Illustrate strategy• Updated projection will be similar in scale

We are in the process of updating the projections for: • e-cooling and stacktail schedules and strategy• Improved reliability (longer stores and stacking)• Mixed-source op - assume break even (conservative)


Design and Base Projections Design and Base Projections (Feb04 DOE Review)(Feb04 DOE Review)

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9/29/03 9/29/04 9/30/05 10/1/06 10/2/07 10/2/08 10/3/09

Start of Fiscal Year

Inte

grat

ed L

umin

osit

y (

fb-1

)

Design Projection

Base Projection

Integrated Luminosity

Design Projection - No schedule contingency, maintains eng. design margin per subproject

Base Projection - Assumes schedule slip for all subprojects and that all subprojects under perform


Design and Base Projections Design and Base Projections (Feb04 DOE Review)(Feb04 DOE Review)

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9/29/03 9/29/04 9/30/05 10/1/06 10/2/07 10/2/08 10/3/09


Inte

grat

ed L

umin

osit

y pe

r W

eek

(pb-1)

Phase 1(FY04)

Phase 2(Slip Stacking)

Phase 3(Recycler &

Electron Cooling)

Phase 4(Stacktail upgrade)

Phase 5(Tevatron upgrades

complete)

Phase 6(No upgrade-related studies)

Design Projection

Base Projection

We arehere

Integrated Luminosity per Week


Risk Analysis / Strategy Risk Analysis / Strategy (Feb04 DOE Review)(Feb04 DOE Review)

Our plan is to deliver the Design Projectionbut develop strategy for fallback scenarios:

Base Projection models schedule slip and under-performance for all upgrades

Can also ask: where would we be without Recycler & e-cooling? with e-cooling, but without stacktail upgrade?



Design Projection Electron Cooling Stacktail Upgrade

Parameters in FY09• Debuncher & AP2 at 32-mm-mrad• Slip Stacking at 8x1012 ppp• Av. Stk Rate = 39x1010/hr• Stk in Accum = 20x1010

• Stk in Rec’r = 570x1010

Base Projection As above with sched & param slip

Parameters in FY09• Debuncher & AP2 at 25• Slip Stacking at 7x1012 ppp• Av. Stk Rate = 24x1010/hr• Stk in Accum = 24x1010


Black Projection NO Electron Cooling NO Stacktail Upgrade

Parameters in FY09• Debuncher & AP2 at 21• Slip Stacking at 7x1012

• Av. Stk Rate = 14x1010/hr• Stk in Accum = 205x1010


Purple Projection Electron Cooling NO Stacktail Upgrade

Parameters in FY09• Debuncher & AP2 at 20• Slip Stacking at 8x1012

• Av. Stk Rate = 23x1010/hr• Stk in Acum = 58x1010



0

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9/29/03 9/29/04 9/30/05 10/1/06 10/2/07 10/2/08 10/3/09


Inte

gra

ted

Lu

min

osi

ty p

er

We

ek

(pb

-1)

e-cooling antiprotons

f or HEP

6/ 1/ 05

Stacktail Upgd ready to install

Rapid transf ers

Acc Upgd on track

8/ 8/ 05


with e-cooling, but w/o stacktail upgd

without e-cooling& stacktail upgd

Branch points from Design ProjectionDesign

Black

Purple

Assumes average store length 15 hrs


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50

9/29/03 9/29/04 9/30/05 10/1/06 10/2/07 10/2/08 10/3/09


Inte

grat

ed L

umin

osity

per

Wee

k (p

b-1)

Strategy ChangesStrategy Changes

Design

Black

Purple

mixed-source

operation longer stores

e-cooling and interim stacktail upgrade will be delayed to fall 2005, full upgrade in 06

interim Stacktail upgrade

WARNING: curves not yet updated changes in green to be implemented



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9/29/03 9/29/04 9/30/05 10/1/06 10/2/07 10/2/08 10/3/09


Inte

gra

ted

Lu

min

osi

ty (

fb-1

)

8.5 fb-1

6.5

4.4

Design

Base

Black

Purple


Summary Summary

Current performance is above the design projection

80% higher weekly luminosity than a year ago

Major achievements in the last year (Tevatron perf, Recycler…)

There is a complex-wide plan for the Run II campaign

Plan is dynamic: schedule/scope adjustments, mixed-source, capitalize on improved reliability

The upgrade projects are making good technical progress

The plan and progress are formally reviewed by DOE

With the updated plan, expect the design projection to be close to the previous 8.5 fb-1 2009, with fall-back scenarios >4.5 fb-1

run ii status and prospects - spalding1 run ii status and prospects jeff spalding fermilab june 14,...

Documents

antiproton collection

antiproton storage ring

pbar targetupgrade

tev tunes

higher intensity bunches

ongoingimproved reliability

improved optics

heliximproved reliability