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Positron Target R&D at KEK Plan and Status

Positron Target R&D at KEK Plan and Status. AD&I Meeting 2009/8/27 KEK. Hybrid Target Test at KEKB Linac Liquid Lead Target Test at ATF Linac Window Test at KEKB Beam Abort. Hibrid Target TEST at KEKB LINAC. JFY2009. 1 To Demonstrate positron yield with the hybrid system

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Positron Target R&D at KEK Plan and Status

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  1. Positron Target R&D at KEKPlan and Status AD&I Meeting 2009/8/27 KEK Hybrid Target Test at KEKB Linac Liquid Lead Target Test at ATF Linac Window Test at KEKB Beam Abort

  2. Hibrid Target TEST at KEKB LINAC JFY2009 • 1 To Demonstrate • positron yield with the hybrid system • heat reduction by hybrid target w/ a real beam (angular divergence, alignment) and crystal (mosicity),,, JFY2010~ • 2. Detail investigation toward the positron source • momentum distribution, • ( angular distribution of e+ )

  3. experimental site KEKB LINAC Switch yard e+ source

  4. Site Set upLooking up from Down stream

  5. Status Major Equipments Sweeping Magnet Analyzer magnet, detectors, beam dumps have installed at the end of KEKB LINAC First experiment expected in September

  6. A design for the ILC(Chehab et.al) • INCIDENT BEAM: 10 GeV • TARGETS: • CRYSTAL: a 1 mm thick W crystal <111>orientation • AMORPHOUS: an 8 mm thick amorphous target • CAPTURE SYSTEM: AMD with decreasing field from 6 to 0.5 Tesla on 50 cms Accelerating field is 18 MeV/m, peak [SW] • Accepted yield: 1.5 e+/e- (s -= 2.5 mm) • PEDD/bunch: • assuming an incident e- bunch of 2. 1010 e-s - =2.5mm • crystal amorphous • 0.058 J/g/bunch 0.33 J/g/bunch Amorphous target may survive with 300 Hz design

  7. Beam Intensity Bunch intensity is sufficient, but energy in 300ns (shockwave time scale) is far below the ILC design.

  8. Liquid lead target test at ATF Linac End Liquid lead 300℃ We kek decided to do the beam experiment with BINP prototype liquid lead target. Bend Target Q Q 10.3m 4.5m 2.0m

  9. ATF Linac Beam Parameters • function tuning range : 0.1m to 10m Bunch structure : 1 to 20 bunches/train Bunch charge : 0.5 to 2.0 x 1010 electrons/bunch Beam energy : 1.3GeV Repetition rate : 0.7 to 6.25Hz Usual normalized emittance : less than 10pmmmrad Beam size : 0.2 to 2.0mm Energy density on target 0.006 to 48 x 1010 GeV/mm2 Power deposit on target 0.004 to 300 x 1010 GeV/mm2 s Acceptable beam rep. rate?

  10. (0.017-50 x1012 GeV/mm, 40kW) in the case of Undulator scheme (0.02-60 x1012 GeV/mm, 290kW) in the case of 1msec ILC like beam, (2 x1012 GeV/mm2, 2 kW) in the case of new scheme. (0.7 x1012 GeV/mm2, 30kW) in the case of X-band LC with three targets NLC and JLC ATF Linac Beam Test Area Need the data for Titanium Alloy. [???] 2014/5/31 10 Logachev Plot under consideration

  11. Scheme of the prototype of liquid lead positron production target. Driving motor Rotating vacuum feedthrough Vacuum pump Vacuum tank of the system Cog-wheel pump Target head Window thickness 4mm BN disks for windows Diameter 12mm Liquid lead transport tubes

  12. Tentative Schedule and Summary Schedule : transport of the proto type will be end of Oct.. Stand alone self testing will be in Nov.. Installation will be in Dec.. This schedule is not fixed. Systematic experimental studies on Liquid 90%Pb+ 10%Sn target system with BN window will start from late 2009. (Maybe, end of this year.) We are still discussing what kind of measurements are necessary for ILC target system and detail schedule. To learn the operation of this liquid target is important for the evaluation of the reliability and the maintainability and we can propose very reliable target system for ILC e+ source with a lot of simulation and some proofs of experimental results.

  13. Liq. Pb Window Test at KEB • By injecting the KEKB stored beam into a test target, any damages on the ILC e+ production target can be reproduced. • KEKB mode : just inject KEKB stored beam. • ILC mode : modify the abort kicker and bunch fill pattern to reproduce more realistic ILC drive beam. Stored beam and dump • KEKB-HER: 8GeV, 10nC, 1300 bunches (1300mA)‏ • The beam is deflected by the abort kicker as shown when it is dumped. • Because of “Step size” variation, the energy density is varied from 1810 to 13700 J/mm2. Dump pattern

  14. KEKB Beam Dump setup • It is a test for isolation window material for liquid Pb target system. • Space is very limited for KEKB BD. • Solid Radiator (Solid Pb) is placed before BN plate, as a test material. • The sample is fixed with support rod, which also acts as cooling channel. • Thermo-coupler, acoustic sensor for monitor. • Final investigation for damage is made by optical and laser microscopy.

  15. Beam Condition • 10nC, ~1500 bunches, 10ms • Bunch-by-bunch impossible • Unable to change beam size(~1mm rms?) • Swept by kicker (protect extraction window) • Moves 7m ~ 45m/bunch on target (0.9mm ~ 6mm over 132 bunches)

  16. Schedule • KEKB operation Oct-Dec (~2 months)(Must get window material from BINP) • ~3yrs long shutdown from January for SuperKEKB upgrade. Experiment impossible. • Use the beginning of 8hr maintenance time every other week. • A pilot shot (maybe single bunch) needed for alignment check • Have to wait ~1hr? for radiation cooling after every shot. • General agreement by KEKB team. Detail must still be worked out.

  17. Beam Intensity for LPb Target

  18. backup

  19. No sweep in vertical 80n J KEKB mode : reproduces only the energy density. • Turning off the vertical kicker. • Fill 1 or 2 bunches only at zero-cross. • These bunches hit a same spot every 1430ns . * Assume 1mm2 spot size. ILC Mode : reproduce both energy flux and density.

  20. Liquid lead jet in vacuum Cog-wheel pump test bench is in continuous run (20000 h) with liquid lead jet. 90% Pb, 10% Sn alloy at 300ºC. 2014/5/31 20 20

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