NuMI Target November 7-11, 2003 NuMI Target Jim Hylen / FNAL - - PowerPoint PPT Presentation

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NuMI Target November 7-11, 2003 NuMI Target Jim Hylen / FNAL - - PowerPoint PPT Presentation

Oct 29, 2022 142 likes •348 views

NuMI NBI2003 NuMI Target November 7-11, 2003 NuMI Target Jim Hylen / FNAL Status, Testing, Support Module Page 1 At NBI02: Beam test results of Medium Energy style target (graphite fin clamped by aluminum cooling plates) Design

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SLIDE 1

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 1

NuMI Target Status, Testing, Support Module

At NBI’02:

  • Beam test results of Medium Energy style target

(graphite fin clamped by aluminum cooling plates)

  • Design shown of Low Energy target

(graphite soldered to Stainless water pipes) At NBI’03:

  • Low Energy target construction complete
  • Vibration testing of target in progress
  • Design complete of target carrier (assembly begun)

which allows remotely changing neutrino beam energy Outlook:

  • Install target in target hall – June 2004
  • Measure hadron production using (spare) target in MIPP/E907 experiment - Fall 2004
  • Commission NuMI with beam – December 2004
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SLIDE 2

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 2

NuMI target collaboration

IHEP Protvino design team V.Garkusha, V.Zarucheisky F.Novoskoltsev, S.Filippov, A.Ryabov, P.Galkin, V.Gres, V.Gurov, V.Lapygin, A.Shalunov, A.Abramov, N.Galyaev, A.Kharlamov, E.Lomakin, V.Zapolsky FNAL design team J.Hylen, K.Anderson FNAL beam test J.Morgan, J.Hylen, H.Le, A. Kulik, P. Lucas, G. Koizumi ANL vibration test R.Wagner Energy deposition calculations done with MARS Target construction done at IHEP

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SLIDE 3

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 3

NuMI target types

(Low Energy refers to neutrino spectrum, not beam power) Graphite (POCO ZXF-5Q) is target material Low Energy Target must fit in horn this is what we have built Medium Energy Target easier, more robust

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SLIDE 4

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 4

Different ν spectra obtained by changing target and moving 2nd horn

L.E. gives MINOS best match to current SuperK ∆m2

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SLIDE 5

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 5

Reasonable High Energy beam can be produced by just moving LE target

“Semi-beams” Full Beams Just moving LE target New target, move horn 2

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SLIDE 6

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 6

νµ spectra moving off-axis

Future off-axis experiment in Minnesota?

L.E. M.E. 2 GeV beam off-axis Off-axis experiment probably prefers M.E. configuration

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SLIDE 7

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 7

Low Energy Target Construction

Graphite Fin Core 2 int. len. Water cooling tube also provides mechanical support Aluminum vacuum tube

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SLIDE 8

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 8

Target – Internal Monitoring

Narrow – location checked by scanning beam across edge. Sense by: (i) charge (delta-rays) knocked

  • ut (wire connected to

target) (called Budal) (ii) scattered beam into cross hairs ionization chamber (BLM) Casing of target fin electrically insulated from base. Wire strung from case to top of module. When moving, can sense if case touches horn by short to “ground”.

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SLIDE 9

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 9

Will use Helium instead of vacuum for high beam power running

Aluminum vacuum tube is insulated from water cooling to allow Budal monitor to work. At design beam power, conduction from tube through helium to water pipe is important. (downstream end still reaches 190 deg C). Can still use vacuum for low power beam alignment scans

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SLIDE 10

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 10

NuMI target vibration testing

Target tip vibration induced by:

  • Pulsing horn

< 0.01 mm (Target does not touch horn 2.5 mm clearance)

  • Air flow similar to target hall

~ 0.06 mm

  • Air flow with target out of horn

~ 0.5 mm (need to redo with

  • uter tube in place)
  • Water flow

(not measured yet) Target in L.E. location in horn

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SLIDE 11

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 11

Target Temperature (Calculation)

  • lots of headroom

NuMI beam design parameters:

  • 0.4 MW beam power
  • 120 GeV/c proton beam
  • 4x1013 protons per 8.6 µsec beam spill
  • 1.87 sec repetition rate
  • 1 mm RMS circular beam spot size
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SLIDE 12

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 12

Target dynamic stress calculation

Safety factor of 3.8 at fin center Safety factor of 2.2 at curved edge of fin Note fin is in 2 cm segments to prevent stress buildup

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SLIDE 13

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 13

Radiation Damage is still the big uncertainty

Most radiation damage info is from reactor neutrons In this example, graphite self- destructs at ~ 2x1020 n/mm2 Highest radiation density in NuMI target is proton spot near entrance ~ 0.5x1020 p/mm2 / year NuMI target test accumulated 0.023x1020 p/mm2 with no visible damage Target longevity uncertain – will gain experience in 2005

Radiation Damage and Life-time Evaluation of RBMK Graphite Stack, XA9642904, P.A.Platonov, O.K.Chugunov, V.N.Manevsky, V.I.Karpukhin, Russian Research Center Kurchatov Institute

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SLIDE 14

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 14

Baffle

Protects beamline elements (e.g. target water lines) from mis-steered proton beam that could do damage in a single pulse Graphite encapsulated in aluminum tube 150 cm long, 6 cm diamter 11 mm diameter hole for beam Air-cooling boosted by pin radiators Scraping of a few percent of beam here would affect neutrino spectrum Detect scraping by temperature rise

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SLIDE 15

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 15

Target station in pictures

(10% of ) Shielding Blocks 1 of 2 focusing horns Target with motion system 1 of 3 Support modules

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SLIDE 16

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 16

Target and Horn hang from support/shielding modules

Water tank

Baffle Target Target/Baffle Module Horn 1 Module Horn 1 Carrier

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SLIDE 17

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 17

Target / Baffle can be remotely moved 2.5 m along beam direction, 20 cm vertically, +/- 8mm horzontally

Baffle Target Shielding / Support Module T/B Carrier Vertical motion gets target out

  • f way for beam scan of

horn cross hairs Drive motors

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SLIDE 18

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 18

Target/Baffle Carrier

Target Water lines compress like spring Baffle Support shafts move whole carrier for transverse motion but motion along beam uses ball screw below module to push/pull cradle Rollers Dirt on screw drive test – no problem

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SLIDE 19

NuMI

NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 19

NuMI Target Summary

At NBI’02:

  • Beam test results of Medium Energy style target

(graphite fin clamped by aluminum cooling plates)

  • Design shown of Low Energy target

(graphite soldered to Stainless water pipes) At NBI’03:

  • Low Energy target construction complete
  • Vibration testing of target in progress
  • Design complete of target carrier (assembly begun)

which allows remotely changing neutrino beam energy Outlook:

  • Install target in target hall – June 2004
  • Measure hadron production using (spare) target in MIPP/E907 experiment - Fall 2004
  • Commission NuMI with beam – December 2004