Shaft Plasma Material science Trials at ORION.


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2 nd ORION Workshop February 18-20, 2003 Bar Plasma Material science Analyses at ORION Mark Hogan SLAC 2 nd ORION Workshop February 18-20, 2003 Diagram Vast Fields Indicate Huge Guarantee in Bar Plasma Material science Highlights of Late Investigations Sample Tests
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2 nd ORION Workshop February 18-20, 2003 Beam Plasma Physics Experiments at ORION Mark Hogan SLAC

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2 nd ORION Workshop February 18-20, 2003 Outline Large Fields Show Large Promise in Beam-Plasma Physics Highlights of Recent Experiments Example Experiments Look towards the Working Group soliciting how some from the open inquiries may be tended to at ORION

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Recent Results III: Promise and Challenge E-157 & E-162 have watched an extensive variety of marvels with both electron and positron drive shafts: Electron Beam Refraction at the Gas–Plasma Boundary e - & e + Focusing X-beam Generation Wakefield increasing speed qⵠ1/sin f q ≈ f o BPM Data – Model Phys. Rev. Lett. 2002, 2003 To Science 2003 Phys. Rev. Lett. 2002 Nature 2002 ORION specialists in the course of recent years, built up an office for doing one of a kind material science, furthermore a considerable lot of the strategies and the aptitude fundamental for directing next trials

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develops to Concepts For Plasma-Based Accelerators Pioneered by J.M.Dawson Research into “advanced” advancements and ideas that could give the following advancements required by molecule material science. Much of the time one is applying or developing material science and innovation that is its own control to speeding up (ex. plasma material science, laser physics…). Dynamic group researching high-recurrence rf, two-bar quickening agents, laser quickening agents, and plasma quickening agents. Laser Wake Field Accelerator(LWFA) A solitary short-beat of photons Plasma Beat Wave Accelerator(PBWA) Two-frequencies, i.e., a train of heartbeats Self Modulated Laser Wake Field Accelerator(SMLWFA) Raman forward disseminating precariousness Plasma Wake Field Accelerator(PWFA) A high vitality electron (or positron) bundle

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But would it be able to lead to…? A 100 GeV-on-100 GeV e - e + Collider Based on Plasma Afterburners 3 km 30 m Afterburners LENSES 50 GeV e - 50 GeV e + e - WFA e + WFA IP

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Many Issues Need to Be Addressed First 1. Advancement of plasma sources equipped for delivering densities > 10 16 e -/cm 3 over separations of a few meters. 2. Evaluate impediments of plasma lenses because of chromatic and round variations. 3. Stable engendering through such a long high-thickness particle segment – bar coordinating and no restrictions because of electron hose flimsiness. 4. Protection of shaft emittance 5. Quickening slopes requests of greatness bigger than those concentrated on to date – by means of shorter groups and enhanced profiles. 6. Pillar stacking of the plasma wake with ~ half charge of the drive bar indeed, these issues should be tended to for some uses of bar plasma collaborations Many advances in late years…

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E-150: Plasma Lens for Electrons and Positrons Phys. Rev. Lett. 87 , 244801 (2001) Built on right on time low-vitality showing examinations in ahead of schedule to mid-nineties: FNAL (1990), JAPAN (1991), UCLA (1994)… Demonstrated plasma lensing of 28.5GeV pillars

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- - - - - + - + - + - + - + - + - + - electron shaft - - - - Ez E-157, E-162, E-164 and E-164X: All (e - or e + ) Beam Driven PWFA LINEAR PWFA SCALING Decelerating Accelerating E z : quickening field N : # e -/group s z : gaussian pack length k p : plasma wave number n p : plasma thickness n b : bar thickness Short bundle! m For as well as m However, when n b > n p , non-direct or “blow-out” administration m Scaling laws legitimate?

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E-162, E-164 & E-164X: Common Experimental Apparatus A snappy indication of how we do these tests in the FFTB… Located in the FFTB Ionizing Laser Pulse (193 nm) Streak Camera (1ps determination) e - or e + ∫Cdt Li Plasma n e ≈2â·10 14 cm - 3 L≈1.4 m X-Ray Diagnostic N=2â·10 10 s z =0.6 mm E=30 GeV Cerenkov Radiator Optical Transition Radiators Spectrometer Dump 25 m FFTB Not proportional!

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n e =0 n e ≈10 14 cm - 3 2mm • Ideal Plasma Lens in Blow-Out Regime e - 2mm • Plasma Lens with Aberrations e + Plasma Focusing of Electrons and Positrons • OTR pictures ≈1m from plasma way out Note: e nx > e ny

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Experiments at ORION may address confinements of plasma lenses High de-amplification plasma lens could help focus a definitive constraints of plasma lenses. For a plasma lens with length equivalent to the central length the de-amplification is given by: Want little emittance, extensive introductory bar size, however enough shaft thickness for victory Limitations because of geometric and chromatic variations: & J. J. Su et al Phys. Rev. A 41, 3321 (1990)

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E-157 E-162 Run 2 Plasma OFF s x (µm) Phase Advance   n e 1/2 L Phase Advance   n e 1/2 L Stable Propagation Through An Extended Plasma Beam coordinated to the plasma when: Physical Review Letters 88 , 154801 (2002) - Matching minimizes spot size varieties and balance out hose shakiness - Places a premium on getting little spots

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Stable Propagation Part II Electron Hose Instability?  No critical insecurity saw in E-162 with n p up to 2 ï‚\' 10 14 cm - 3 , and L =1.4 m - Hose precariousness develops as 1 exp((k b L) 2/3 ) , where k b = w p/(2 g ) 1/2 c=(n p e 2/e 0 m e 2 g ) 1/2 c E-162: n p =2 ï‚\' 10 14 cm - 3 , L =1.4 m => e 4.5 =92 E-164: n p =6 ï‚\' 10 15 cm - 3 , L =0.3 m => e 5.4 =227 E-164X: n p =2 ï‚\' 10 17 cm - 3 , L =0.06 m => e 5.4 =227 no noteworthy development expected (?) Theory accept a preformed channel, dismisses return currents… Simulations incorporate these impacts furthermore foresee little development 2 Phys. Rev. Lett. 67 , 991 (1991) Phys. Rev. Lett. 88 , 125001 (2002)

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E-157: Electron Beam Refraction At Plasma–Gas Boundary Asymmetric Channel Beam Steering Symmetric Channel Beam Focusing Core + + + e - + Plasma, n e - - - Head q f r c = a (n b/n e ) 1/2 r b qⵠ1/sin f • Vary plasma – e - pillar edge f utilizing UV pellicle • Beam centroid removal @ BPM6130, 3.8 m from the plasma focus q ≈ f o BPM DATA Impulse Model P. Muggli et al., Nature 411, 2001

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Experiment (Cherenkov pictures) Laser off Laser on 3-D OSIRIS PIC Simulation Refraction of an Electron Beam: Interplay between Simulation & Experiment l first 1-to-1 demonstrating of meter-scale test in 3-D! P. Muggli et al., Nature 411 , 2001

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E-162: X-Ray Emission from Betatron Motion in a Plasma Wiggler Central Photon Energy = 14.2 keV Number of Photons = 6x10 5 Peak Spectral Brightness = 7x10 18 [#/(sec-mrad 2 - mm 2 - 0.1%)] Phys. Rev. Lett. 88 , 135004 (2002)

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SM-LWFA electron vitality range S h o t 1 2 ( 1 0 k G ) 6 S h o t 2 6 ( 1 0 k G ) 1 0 S h o t 2 9 ( 5 k G ) S h o t 3 ( 5 k G ) S h o t 3 9 ( 2 . 5 k G ) 5 1 0 S h o t 4 0 ( 2 . 5 k G ) 4 1 0 Relative # of electrons/MeV/Steradian 3 1 0 6 8 1 0 2 0 4 0 6 0 8 0 1 0 2 0 E l e c t r o n e n e r g y ( i n M e V ) Plasmas Have Demonstrated Ability to Support Large Amplitude Accelerating Electric Fields 100 MeV Laser Wakefield Results A. Ting et al NRL 200 MeV Laser Wakefield Results at Ecole Poly., France Accelerating Gradient ~200 GeV/m! Quickening Gradient > 100 GeV/m V. Malka et al., Science 298 , 1596 (2002) Need controlling or other system to expand cooperation remove past a couple mm

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Particles in the center about de-quickened to zero! Quickened Tail Particles Average Gradient ~ 70 MeV/m PWFA Acceleration Experiments at ANL-AWA and FNL-A0 Head Tail Simulation N. Barov et al, PAC-2001-MOPC010, FERMILAB-CONF-01-365, Dec 2001. 3pp

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Beam Driven PWFA Single Bunch Energy Transformer OSIRIS Simulation Experimental Data Head Average measured vitality misfortune (cut normal) : 159â±40 MeV Average measured vitality increase (cut normal) : 156 ±40 MeV (≈1.5 ï‚\' 10 8 e -/cut)

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A Few Examples of How ORION Might Help Address Some of These Issues

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10 0 Gradient (GeV/m) - 10 Flexible Electron Source  Opportunities for Plasma Wakefield Acceleration PWFA with advanced commute group for transformer proportions (>2) Bunch pressure (R 56 < 0) delivers a sloped profile with a sharp cutoff  high transformer proportion

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Drive and Witness Beam Production Compressed, high-current 350 MeV drive heartbeat Narrow vitality spread, 60 MeV witness beat, with persistently variable deferral 0-120 ps Vernier Delay chicane Combiner chicane (additionally packs drive heartbeat) Fast kicker and septum magnet HIGH ENERGY HALL NLCTA

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Use Witness Bunch Capability to Study Effects Of bar Loading on Accelerating Wake 1+1 ≠ 2: Simulation versus Straight Superposition Linear superposition Nonlinear wake second bar charge thickness first shaft charge thickness Nonlinear wake

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…and the Transverse (Focusing) Wake Focusing Force Also Effected By Beam Loading Linear superposition of centering power Focusing power on r=0.5c/Wp Simulation result 2 bar charge densities

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Ion Channel Laser 1 : Proof of Principle at Optical Wavelengths “Accelerator-based synchrotron light sources assum

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