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Run II Status and Prospects. Jeff Spalding Fermilab June 14, 2004. Contents. 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 & D0 ….

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Run ii status and prospects

Run II Status and Prospects

Jeff Spalding

Fermilab

June 14, 2004

Run II Status and Prospects - Spalding


Contents

Contents

  • Introduction

  • Major elements of the Run II “campaign”

  • Present performance

  • Status of the upgrade projects

  • Luminosity projection

  • Summary

Run II Status and Prospects - Spalding


Run ii goal maximize integrated luminosity delivered to cdf d0

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

Run II Status and Prospects - Spalding


With a program of upgrades throughout the complex

… with a program of upgrades throughout the complex

Recycler Ring

Run II Status and Prospects - Spalding


Basis for the plan what drives the luminosity

Basis for the Plan: What drives the luminosity

  • Peak Luminosity

  • Luminosity lifetime (tunes, beam-beam interactions)

  • Reliable Operation

ep,epbar,form factor F, b* provide some gains

But major improvements from bunch intensities

  • especially total number of pbars BNpbar, (B=36 bunches for Run II)

  • proton brightness (Np/ep) is constrained by beam-beam tune shift

Run II Status and Prospects - Spalding


Run ii status and prospects

Major Elements of the Run II Campaign

Run II Status and Prospects - Spalding


Operational improvements and upgrade projects

Operational 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

Run II Status and Prospects - Spalding


Reliability

Reliability

  • 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

Run II Status and Prospects - Spalding


Upgrade projects

Upgrade Projects

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

Run II Status and Prospects - Spalding


Status of operations

Status of Operations

Run I

Run II Status and Prospects - Spalding


Status integrated luminosity

Status: Integrated Luminosity

Compare the last 12 months to the year before

Up 55% with 14% fewer scheduled running weeks

Average integrated luminosity per week is up 80%

Run II Status and Prospects - Spalding


Status peak luminosity

Status: Peak Luminosity

Current best = 7.6E31 cm-2s-1

*

Run II Status and Prospects - Spalding


Summary of current operations

Summary 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

Run II Status and Prospects - Spalding


Status of the upgrade projects

Status of the Upgrade Projects

Run II Status and Prospects - Spalding


Main injector

Main 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.

Run II Status and Prospects - Spalding


Pbar source

Pbar 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

Run II Status and Prospects - Spalding


Recycler

Recycler

  • 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

Run II Status and Prospects - Spalding


Electron cooling

Electron 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

Run II Status and Prospects - Spalding


Tevatron

Tevatron

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

Run II Status and Prospects - Spalding


Luminosity projections

Luminosity Projections

Run II Status and Prospects - Spalding


Luminosity projection

Luminosity 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)

Run II Status and Prospects - Spalding


Design and base projections feb04 doe review

Design and Base Projections (Feb04 DOE Review)

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

Run II Status and Prospects - Spalding


Design and base projections feb04 doe review1

Design and Base Projections (Feb04 DOE Review)

Integrated Luminosity per Week

We are

here

Run II Status and Prospects - Spalding


Risk analysis strategy feb04 doe review

Risk Analysis / Strategy (Feb04 DOE Review)

Our plan is to deliver the Design Projection

but 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?

Run II Status and Prospects - Spalding


Risk analysis strategy feb04 doe review1

Design Projection

Electron Cooling

Stacktail Upgrade

Parameters in FY09

Debuncher & AP2 at 32p-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 25p

Slip Stacking at 7x1012 ppp

Av. Stk Rate = 24x1010/hr

Stk in Accum = 24x1010

Stk in Rec’r = 360x1010

Risk Analysis / Strategy (Feb04 DOE Review)

  • BlackProjection

    • NO Electron Cooling

    • NO Stacktail Upgrade

    • Parameters in FY09

      • Debuncher & AP2 at 21p

      • Slip Stacking at 7x1012

      • Av. Stk Rate = 14x1010/hr

      • Stk in Accum = 205x1010

      • Stk in Rec’r = 0x1010

  • Purple Projection

    • Electron Cooling

    • NO Stacktail Upgrade

    • Parameters in FY09

      • Debuncher & AP2 at 20p

      • Slip Stacking at 8x1012

      • Av. Stk Rate = 23x1010/hr

      • Stk in Acum = 58x1010

      • Stk in Rec’r = 337x1010

Run II Status and Prospects - Spalding


Risk analysis strategy feb04 doe review2

Risk Analysis / Strategy (Feb04 DOE Review)

with e-cooling, but

w/o stacktail upgd

without e-cooling

& stacktail upgd

Branch points from Design Projection

Design

Purple

Black

Assumes average store length 15 hrs

Run II Status and Prospects - Spalding


Strategy changes

50

40

30

Integrated Luminosity per Week (pb-1)

20

10

0

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

Strategy Changes

WARNING: curves not yet updated

changes in green to be implemented

Design

e-cooling and interim stacktail

upgrade will be delayed

to fall 2005, full

upgrade in 06

interim Stacktail upgrade

Purple

Black

mixed-source

operation

longer stores

Run II Status and Prospects - Spalding


Risk analysis strategy feb04 doe review3

Risk Analysis / Strategy (Feb04 DOE Review)

Design

Purple

Black

Base

Run II Status and Prospects - Spalding


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 - Spalding


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