High energy gains in field-ionized noble gas plasma accelerators
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1 High energy gains in field-ionized noble gas plasma accelerators Laser and Plasma Accelerators Workshop 2013 Sébastien Corde, September 05, 2013
2 Outline - High energy gains in Ar - Energy Doubling, up to 30 GeV energy gain - Dependance of interaction with plasma density - QuickPIC simulations: use of high density plasma with > 100 GV/m fields, extended acceleration length to ~ 20 cm - Beam-plasma interaction in He - More than 90% energy loss - No acceleration - Beam-plasma interaction in He/Ar mixture and in Li - Energy gain threshold at Ar partial pressure of 16 Torr - Almost energy doubling in Li by disabling Ar/He ionization - Energy gain suppression in Li by enabling Ar/He ionization
3 The E200 experimental setup Facet electron beam 20 GeV, 3 nc Ar gas (or He) Dipole Vacuum pipe Be window Rb vapor (or Li) Be window Deflected electrons (Cherenkov detector) Here, the gas is field-ionized by the electron beam itself. A few important numbers: - Ionization potential. Ar: 15.8 ev Rb: 4.2 ev - E-field required for ionization. Ar: ~40 GV/m Rb: ~4 GV/m - Head Erosion velocity: 10x faster in Ar compared to Rb. V [µm/m] = i [ev] N [mm.mrad] 1 I 3/2 [ka]
4 High energy gains in Ar Acceleration up to 47 GeV Ar results with fully compressed electron beam: - The Facet electron beam is able to consistently field-ionize Ar. - More than Energy Doubling in Ar! Acceleration from 20 GeV to ~47 GeV. Deceleration down to below 6 GeV
5 High energy gains in Ar Energy Gain Camera Energy Loss Camera Energy doubling P = 20 Torr
6 High energy gains in Ar P = 2 Torr P = 4 Torr P = 8 Torr P = 16 Torr P = 32 Torr
7 High energy gains in Ar QuickPIC simulation: Field-ionized argon, simulation starts before waist (with no ionization), 10x10x20 um 3 beam, 2x10 10 e -, 50 um x 5 um normalized emittances, density: 5x10 17 cm -3. Ar 16 Torr
8 High energy gains in Ar QuickPIC simulation: Energy gain = 29.9 GeV Energy loss = 20 GeV Ez: up to150 GV/m (around the waist position) Length with ionization: 32 cm Length with useful fields (>75 GV/m): ~ 20 cm Ar 16 Torr
9 High energy gains in Ar P = 2 Torr Loss = 7.9 GeV Gain = 0 GeV P = 4 Torr Loss = 11.9 GeV Gain = 0 GeV P = 8 Torr Loss = 16.9 GeV Gain = 4.7 GeV P = 16 Torr Loss = 20 GeV Gain = 29.9 GeV P = 32 Torr Loss = 20 GeV Gain = 31.6 GeV > 200 GV/m fields
10 Beam-plasma interaction in He
11 Beam-plasma interaction in He Very weak acceleration He results with fully compressed electron beam: - The Facet electron beam is able to consistently field-ionize He (ionization potential = 24.6 ev). - More than 90% of energy loss in He. Deceleration from GeV to below 2.5 GeV. - Head erosion 25x faster in He compared to Rb. Very strong deceleration
12 Beam-plasma interaction in He He results with fully compressed electron beam: - The Facet electron beam is able to consistently field-ionize He (ionization potential = 24.6 ev). - More than 90% of energy loss in He. Deceleration from GeV to below 2.5 GeV. - Head erosion 25x faster in He compared to Rb. Deceleration down to below 2.5 GeV
13 Beam-plasma interaction in He/Ar mixture and in Li
14 Beam-plasma interaction in He/Ar mixture and in Li Ar 21.3%, He 78.7% P = 32 Torr
15 Beam-plasma interaction in He/Ar mixture and in Li Ar 50%, He 50% P = 32 Torr Energy gain threshold at Ar 16 Torr partial pressure
16 Beam-plasma interaction in He/Ar mixture and in Li Li oven P = 32 Torr Disabling Ar/He ionization (Spoiler Foil In) Almost energy doubling
17 Beam-plasma interaction in He/Ar mixture and in Li Li oven P = 32 Torr Enabling Ar/He ionization (Spoiler Foil Out) Energy gain suppression
18 Conclusion Impressive results in a high ionization potential, field-ionized argon plasma. More than energy doubling, with up to 30 GeV energy gain observed. Pressure scan experimental and simulation data in good agreement. > 200 GV/m field achievable at high density. Made possible with self-focusing. > 20 cm of interaction possible due to extended head erosion length, by using large beta functions. Strong beam-plasma interaction in He, though no acceleration. In Li: energy doubling suppressed when enabling Ar/He ionization.
19 The E200 Collaboration E. Adli, C. Clarke, S. Corde, J. P. Delahaye, J. Frederico, S. Gessner, M. Hogan, S. Z. Li, M. Litos, Z. Wu, V. Yakimenko (SLAC, Stanford, USA) W. An, C. E. Clayton, C. Joshi, K. Marsh, W. Mori, N. Vafaei-Najafabadi (UCLA, Los Angeles, USA) W. Lu (Tsinghua U, China) P. Muggli (Munich, Germany)
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