NuMI Primary Beam November 7, 2003 NuMI NuMI Primary Beam NBI03 - - PowerPoint PPT Presentation

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NuMI Primary Beam November 7, 2003 NuMI NuMI Primary Beam NBI03 - - PowerPoint PPT Presentation

Feb 18, 2023 220 likes •414 views

NuMI NBI03 Nov. 7-11, 2003 NuMI Primary Beam S. Childress (FNAL) NuMI Primary Beam November 7, 2003 NuMI NuMI Primary Beam NBI03 Nov. 7-11, 2003 NuMI Primary Beam FNAL Site S. Childress (FNAL) Beam enclosure entrances thru Main

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SLIDE 1

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

NuMI Primary Beam

November 7, 2003

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SLIDE 2

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

NuMI Primary Beam FNAL Site

Beam enclosure entrances thru Main Injector and NuMI Target Service Building (completed Oct)

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SLIDE 3

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

NuMI Primary Design Parameters

404 kW at maximum intensity Total beam power 4 x 1013 ppp (protons/spill) Maximum intensity 5 batches = 8.14 µsec 6 batches = 9.78 µsec NuMI spill (pbar operation) NuMI spill (no pbar operation) 2 x 10-4 δp/p 2σ expected 3 x 10-3 δp/p 2σ max Momentum spread 40π mm-mr expected (95%) 500 π mm-mr maximum envelope Transverse emittance 18.8 nsec (53 MHz) Batch spacing 84 batches Batch length 3-8 nsec Bunch length >= 1.87 sec Spill cycle time 120 GeV Proton beam energy

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SLIDE 4

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

NuMI Primary Priorities: 2002-03

  • Finalize extraction & primary transport beam design
  • 3-D modeling to understanding fitting in Main Injector – Recycler region
  • Completion of magnet refurbishment & corrector fabrication
  • Kicker magnet construction
  • Completion of large magnet installation in tunnels accessed thru Main

Injector (Sept-Oct shutdown – our top priority)

  • Accelerator systems ‘NuMI mode’ beam tests (Bob Zwaska presentation)
  • Instrumentation design / construction

« New BPM electronics « New SEM profile monitors (Sacha Kopp presentation)

  • Understand beam sensitivity to error sources
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SLIDE 5

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Beam Transport & Aperture Clearance

Maximal Beam Sizes, 500pi & 3E-3, vs Clearances

  • 100
  • 80
  • 60
  • 40
  • 20

20 40 60 80 100

  • 100

100 200 300 400 Station (m) Beam Size (mm) Hor beta size Hor eta size Hor total size Hor Bend Aperture Hor Quad Aperture Hor Trim Aperture Hor Other Aperture Vert beta size Vert eta size Vert total size Vert Bend Aperture Vert Quad Aperture Vert Trim Aperture Vert Other Aperture Horizontal plane Vertical plane 09/27/02

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SLIDE 6

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Main Injector Tunnel – MI60

Main Injector Recycler Storage Ring NuMI 3-D model essential to be compatible with

  • ther beams. Initially

many uncertainties > tolerances

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SLIDE 7

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Extraction & Pretarget Enclosures

Extraction Enclosure 156 mrad down-bend Pretarget Enclosure 98 mrad up-bend & target focus

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SLIDE 8

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Kicker Construction

  • 3 kicker Magnets

« Each 2.2 m length « 60 kV max. « 4.0 kG-m at nominal 48 kV

  • 2 magnets complete,

3rd well advanced

  • Testing in progress
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SLIDE 9

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

NuMI Installation MI-608 Region

Extraction Lambertsons Upstream NuMI Transport

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SLIDE 10

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Installation NuMI Extraction Enclosure

V108 down-bend dipoles Quads before carrier tunnel drift Lined 70 m. carrier tunnel

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SLIDE 11

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

2003-2004 Shutdown Efforts

For the upstream half of the NuMI primary beam: MI- 60 and Extraction Enclosures, the only work access is through the Main Injector / Recycler tunnel – with severe restrictions on access options.

All large magnets in these areas (except kickers) are now installed For 2004 shutdown (Summer) must install correctors, all instrumentation, vacuum system, LCW hookup, remaining cabling, and extensive testing.

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SLIDE 12

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Preparing for Installation: Pretarget Tunnel

Tunnel still ‘a bit’ damp Here primary installation is not critical path. Access not tied to Main Injector shutdown Beneficial occupancy October ‘03

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SLIDE 13

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Beta & Eta Functions: Primary Beam Design

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SLIDE 14

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Targeting Requirements

  • Beam’s eye view of target

and baffle.

  • Beam size on target:(σ)

1mm

  • Position stability on target

(σ) +/- 0.25 mm.

« Minimize physics backgrounds

  • Angle stability on target 60

µrad

« Modest requirement for low energy beam

Target Casing Horn inner conductor Target Target Cooling Baffle 6.4 11.0 18.0 30.0 21.4 15.0 Beam 1,2,3 sigma Scale 4x, all units mm Ø6.0 Target Dim 7/01 Dwg Set beam rms 1 x 1 mm 0.4 mm wall water line support ring water loop 8.0 8.0 motion capability +/- 8 mm 19.0 beryllium window support

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SLIDE 15

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Instrumentation Design Impact: Targeting Requirements

  • Beam size at targeting leads to smaller profile monitor

SEM grid pitch (0.5 mm) at targeting [compared to 1 mm along transport].

  • To maintain position accuracy at target requires

functional instrumentation accuracy of a factor of 3-4 smaller than required beam control accuracy.

« Experience from many applications « Requirement for < 75 microns instrumentation accuracy

  • For targeting BPM’s use smaller diameter detector

plate separation (allowed by smaller beam) than along transport

« Enhances detector accuracy proportionally

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SLIDE 16

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

Profile Monitor Usage

  • Profile monitors have a dual use application in the

NuMI primary line

« Determination of beam size and shape along the transport and for targeting. This provides the primary diagnostic for emittance or optics problems, as well as fraction of beam targeted « Precision calibration for the BPM’s. This imposes additional requirements for profile monitor position reproducibility < BPM accuracy.

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SLIDE 17

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

NuMI Beam Position Monitors

Target BPM’s Transport BPM’s Building new BPM electronics based on digital receiver technology. Recently commissioned for Recycler Ring with excellent performance

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SLIDE 18

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

NuMI Beam Control

  • Beam position and profile monitor accuracy

requirements needed to respond to error source sensitivity are well matched to those for targeting, within a factor of 2, with targeting being the more severe.

  • One disadvantage with NuMI beam control compared

to the Main Injector is the additive presence of error sources from individual magnet string power supplies.

  • NuMI beam control requirements for beam loss and

targeting control are met by the combination of enhanced power supply stability <100 ppm for major bends and always active position control [Developed for TeV Switchard; used in several applications]

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SLIDE 19

NuMI

NBI03

  • Nov. 7-11, 2003

NuMI Primary Beam

  • S. Childress (FNAL)

NuMI Primary Priorities: 2004

  • Upstream enclosures beam ready by September 2004
  • Fully beam ready by December 2004
  • Major focus for:

« Pretarget installation « Beam instrumentation construction « Main Injector full ring beam tests « Beam control implementation « EVERYTHING not yet done