NuMI NBI2003 NuMI Target November 7-11, 2003 NuMI Target Jim Hylen / FNAL Status, Testing, Support Module Page 1 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
NuMI NBI2003 November 7-11, 2003 NuMI Target NuMI target collaboration Jim Hylen / FNAL Page 2 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
NuMI NBI2003 NuMI target types November 7-11, 2003 NuMI Target Jim Hylen / FNAL (Low Energy refers to neutrino spectrum, not beam power) Page 3 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
NuMI NBI2003 Different ν spectra obtained by November 7-11, 2003 NuMI Target changing target and moving 2 nd horn Jim Hylen / FNAL Page 4 L.E. gives MINOS best match to current SuperK ∆ m 2
NuMI NBI2003 Reasonable High Energy beam can November 7-11, 2003 NuMI Target Jim Hylen / FNAL be produced by just moving LE target Page 5 “Semi-beams” Full Beams Just moving LE target New target, move horn 2
NuMI ν µ spectra moving off-axis NBI2003 November 7-11, 2003 NuMI Target Jim Hylen / FNAL Future off-axis experiment in Minnesota? Page 6 2 GeV beam off-axis M.E. L.E. Off-axis experiment probably prefers M.E. configuration
NuMI NBI2003 November 7-11, 2003 NuMI Target Low Energy Target Construction Jim Hylen / FNAL Page 7 Graphite Fin Core 2 int. len. Water cooling tube also provides mechanical support Aluminum vacuum tube
NuMI NBI2003 Target – Internal Monitoring November 7-11, 2003 NuMI Target Jim Hylen / FNAL Page 8 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”. Narrow – location checked by scanning beam across edge. Sense by: (i) charge (delta-rays) knocked out (wire connected to target) (called Budal) (ii) scattered beam into cross hairs ionization chamber (BLM)
NuMI NBI2003 Will use Helium instead of vacuum November 7-11, 2003 NuMI Target Jim Hylen / FNAL for high beam power running Page 9 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
NuMI NBI2003 November 7-11, 2003 NuMI Target NuMI target vibration testing Jim Hylen / FNAL Page 10 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 outer tube in place) Target in L.E. location in horn • Water flow (not measured yet)
NuMI NBI2003 November 7-11, 2003 Target Temperature (Calculation) NuMI Target Jim Hylen / FNAL - lots of headroom Page 11 NuMI beam design parameters: • 0.4 MW beam power • 120 GeV/c proton beam 4x10 13 protons per 8.6 µ sec beam spill • • 1.87 sec repetition rate • 1 mm RMS circular beam spot size
NuMI NBI2003 Target dynamic stress November 7-11, 2003 NuMI Target Jim Hylen / FNAL calculation Page 12 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
NuMI NBI2003 Radiation Damage November 7-11, 2003 NuMI Target Jim Hylen / FNAL is still the big uncertainty Page 13 Most radiation damage info is from reactor neutrons In this example, graphite self- destructs at ~ 2x10 20 n/mm 2 Highest radiation density in NuMI target is proton spot near entrance ~ 0.5x10 20 p/mm 2 / year NuMI target test accumulated 0.023x10 20 p/mm 2 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
NuMI NBI2003 November 7-11, 2003 Baffle NuMI Target Jim Hylen / FNAL Page 14 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
NuMI NBI2003 November 7-11, 2003 Target station in pictures NuMI Target Jim Hylen / FNAL Page 15 1 of 3 Target with Support motion system modules (10% of ) Shielding Blocks 1 of 2 focusing horns
NuMI NBI2003 November 7-11, 2003 Target and Horn hang from NuMI Target Jim Hylen / FNAL Page 16 support/shielding modules Target/Baffle Horn 1 Module Module Baffle Carrier Water tank Target Horn 1
NuMI Target / Baffle can be remotely moved NBI2003 November 7-11, 2003 NuMI Target 2.5 m along beam direction, Jim Hylen / FNAL Page 17 20 cm vertically, +/- 8mm horzontally Vertical motion gets target out Shielding / Drive motors of way for beam scan of Support horn cross hairs Module Baffle Target T/B Carrier
NuMI NBI2003 November 7-11, 2003 NuMI Target Target/Baffle Carrier Jim Hylen / FNAL Page 18 Support shafts move whole carrier for transverse motion but motion along beam uses ball screw below module to push/pull cradle Target Rollers Dirt on screw drive test – no problem Baffle Water lines compress like spring
NuMI NBI2003 NuMI Target November 7-11, 2003 NuMI Target Jim Hylen / FNAL Summary Page 19 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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