The PRISM project at the high-intensity proton machine project Akira SATO Osaka University
Contents Physics motivation PRISM Overview Design and R&D Status Summary 2002/10/3 PANIC02@Osaka
Physics Motivation
Search for the Lepton Flavor Violating Process µ � e � # % # % ! " ! " No evidence so far for charged µ � eee lepton µ A � eA # $ # $ ! " ! " 7.89:;19</ =8315 =8315 0 � µ e Limits have been improved K L + � � µ e steadily 56/ 7.89:;19</ K # ' # ' ! " ! " two orders of magnitude per decade 012134/ 56/ # & # & ! " ! " Sensitivities are superb in muon +,,-./ 012134/ systems # ! " # ! " ! " ! " +,,-./ Getting harder To obtain/handle more # ! % # ! % ! " ! " intense muon History of LFV Search limits # ! $ # ! $ ! " ! " !($" !($" !()" !()" !('" !('" !(*" !(*" !(&" !(&" !((" !((" %""" %""" > - 8 . > - 8 . 2002/10/3 PANIC02@Osaka
LFV in SUSY GUT MECO@BNL, MEG@PSI Equivalent sensitivity Future experiment will cover most of parameter space with PRISM Hisano et al. 2002/10/3 PANIC02@Osaka
PRISM project Design R&D status
What is PRISM ? Phase Rotation Intense Slow Muon source a dedicated secondary muon beam channel with high intensity High Field Pion Capture narrow energy spread Phase Rotation High purity for stopped muon experiments. 2002/10/3 PANIC02@Osaka
PRISM Beam Characteristics intensity : 10 11 -10 12 µ ± /sec muon kinetic energy : 20 MeV (=68 MeV/c) range = about 3 g kinetic energy spread : ± 0.5-1.0 MeV ± a few 100 mg range width beam repetition : about 100Hz 2002/10/3 PANIC02@Osaka
PRISM Scheme pulsed proton beam pion capture by high solenoid field pion decay section phase rotation section 2002/10/3 PANIC02@Osaka
Phase Rotation Phase Rotation = decelerate particles with high energy and accelerate particle with low energy by high-field RF energy energy time time A narrow pulse structure (<1 nsec) of proton beam is needed to ensure that high-energy particles come early and low- energy one come late. 2002/10/3 PANIC02@Osaka
FFAG as Phase Rotator Fixed Field Alternating Gradient Synchrotron synchrotron oscillation for phase rotation not cyclotron (isochronous) large momentum acceptance larger than synchrotron ± several 10 % is aimed large transverse acceptance strong focusing large horizontal emittance reasonable vertical emittance at low energy 2002/10/3 PANIC02@Osaka
PRISM layout Pion capture section Decay section Phase rotation section FFAG Based a ring instead of linear systems reduction of # of rf cavities reduction of rf power consumption compact not in scale 2002/10/3 PANIC02@Osaka
Proton driver - PRISM - Joint Project was approved! High intensity0.75 MW 10 14 proton/sec Upgradable to 4x10 14 proton/sec A narrow bunched New Fast extraction line Fast Extraction is necessary Slow Extraction 2002/10/3 PANIC02@Osaka
Beam Extraction - PRISM - Phase Rotator requires ̃ KHz. Slow Extraction Difficult to get < KHz 100 pulse 1ms Kicker Fast Extraction 100 Hz is feasible cf. ~ 1MHz (MECO) 0.1s 2002/10/3 PANIC02@Osaka
Beam experiment with R&D Magnet Beam test with R&D magnet Direct measurement of heat load by radiation Study behavior of magnet under heating condition R&D Magnet 10 T hybrid SC coil Cryo cooler He free Compact Y. Kuno, A. Yamamoto KEK PS 12 GeV proton 10 11 proton/s 2002/10/3 PANIC02@Osaka
Beam test with Coil mockup 2002/10/3 PANIC02@Osaka
A brief history of FFAG Accelerator ̃50’ s FFAG was proposed by Ohkawa, Symon and Kolomensky. a electron FFAG at MURA project. “ Proton FFAG was difficult to realize” Difficulties of designing and manufacturing the large magnet gives the complex magnetic field FFAG magnetic Field : B=B 0 (r 0 /r) k k>1 No RF cavity has the large aperture and gives the high gradient field over a wide-frequency … Great advancement of technologies in 80’ s ̃ 90’ s large CPU power to do the calculation and the simulation easily the invention of a Magnetic Alloy for FFAG RF cavity 1998 PoP (proof of principle) FFAG project, to construct the world first proton FFAG, was started by KEK FFAG group! 2002/10/3 PANIC02@Osaka
R&D for FFAG Now under construction 2002/10/3 PANIC02@Osaka
Simulation studies of phase rotator using GEANT3.21 based simulation code FFAG Acceptance, Phase rotation RF : 5MHz, 250kV/m Muon yield, background rate ΔE/E = 20MeV+4%-5% µ � 0 1 2 3 4 5 2002/10/3 PANIC02@Osaka
PRISM muon-LFV Sensitivity !"#$%&'()*+&# !"#$%&!()*+&## %,-. #/0+/*102&3456/*7*+89 :;<::7*+8 :;<:=7*+8 =>:;<::7*+8 %56/&464+/054 ?@&A&=&%+B78 :CDE;& %+B78 mu &*06''1/F&+GG181+/82 @;H I;H J)KF+0&4)0+K1)L J1&&3L1G+&014+MN=E&/*9 OL&3L1G+&014+M@@;&/*9 Q345RMS+R97Q345MS+F9M Q345RMS+R97Q345MS+F !(2*18*&$+/*101P102 :7=N@ 9M:7N@E 3:TD=C9&L)2+K*&6G=;;&54 J)KF+0)KK)/F+4+/0 =;&L)2+K*&6G&C;&54&'L)0+ 'L)0+ $'+80K64+0+K&)88+'0)/8+ S=TH SI:H =;H $'+80K64+0+K&K+*6L5016/ C;;&U+B&3VWX%9 N;;&U+B&3VWX%9 E;;&U+B&3VWX%9 J14+&Y1/Z6Y V5LL&014+&Y1/Z6Y&3:;;H9 [+L)2+Z&Y1/Z6Y&3C;H9 mu \&'1&)/Z&+ Q+)4&!5K102 45&6/L2 $+/*101P102 I]:;<D:@ I]:;<D:E =]:;<D:T &N&2+)K&3M:;<T&*+89 I&014+*&46K+&'K606/ "+4)KU K5//1/F&014+^&O/)L2*1*&+GG 1/0+/*102 6G&;_C&)**54+Z_ 2002/10/3 PANIC02@Osaka
Muon Factory @ KEK/JAERI Joint Project Muon LFV Muon EDM Muon g-2 2002/10/3 PANIC02@Osaka
Site Layout Proposal Muon-LFV & Muon-EDM Muon g-2 2002/10/3 PANIC02@Osaka
Site Layout Proposal (Cont.) Muon-EDM Muon-LFV Muon g-2 2002/10/3 PANIC02@Osaka
Staging Muon Factory (PRISM,g-2) Muon LFV Muon g-2 (3 GeV/c beam line) Muon Factory-II (PRISM-II,g-2) Physics outcome Muon EDM at each stage Muon g-2 (6 GeV/c beam line) Neutrino Factory Based on 1 MW proton beam Neutrino Factory-II Based on 4.4 MW proton beam Muon Collider 2002/10/3 PANIC02@Osaka
Summary PRISM Super muon beam with new technology LFV,stopped muon experiments R&D Works Superconducting Capture Solenoid FFAG Phase rotator etc…. New Fast Extraction Beamline and Exp Hall Multi purpose PRISM, g-2, mu-EDM, antiproton, etc… Staging Scenario to muon collider 2002/10/3 PANIC02@Osaka
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