scholarly journals Vacuum ultraviolet coherent undulator radiation from attosecond electron bunches

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Enrico Brunetti ◽  
Bas van der Geer ◽  
Marieke de Loos ◽  
Kay A. Dewhurst ◽  
Andrzej Kornaszewski ◽  
...  
Keyword(s):  
Energy Range ◽  
Space Charge ◽  
Numerical Simulations ◽  
Relativistic Electron ◽  
Vacuum Ultraviolet ◽  
Coherent Radiation ◽  
Charge Effects ◽  
Electron Bunches ◽  
Wide Range ◽  
Coherent Emission

AbstractAttosecond duration relativistic electron bunches travelling through an undulator can generate brilliant coherent radiation in the visible to vacuum ultraviolet spectral range. We present comprehensive numerical simulations to study the properties of coherent emission for a wide range of electron energies and bunch durations, including space-charge effects. These demonstrate that electron bunches with r.m.s. duration of 50 as, nominal charge of 0.1 pC and energy range of 100–250 MeV produce $$10^9$$ 10 9 coherent photons per pulse in the 100–600 nm wavelength range. We show that this can be enhanced substantially by self-compressing negatively chirped 100 pC bunches in the undulator to produce $$10^{14}$$ 10 14 coherent photons with pulse duration of 0.5–3 fs.

scholarly journals Numerical analysis of space charge effects in electron bunches at laser-driven plasma accelerators

Open Physics ◽  
2011 ◽  
Vol 9 (4) ◽  
Author(s):  
Anthony Ashmore ◽  
Riccardo Bartolini ◽  
Nicolas Delerue
Keyword(s):  
Space Charge ◽  
Electron Bunch ◽  
Beam Quality ◽  
Experimental Studies ◽  
High Energy ◽  
Space Charge Effects ◽  
Charge Effects ◽  
Electron Bunches ◽  
Plasma Accelerators ◽  
Beam Parameters

AbstractLaser-driven Plasma Accelerators (LPA) have successfully generated high energy, high charge electron bunches which can reach many kA peak current, over short distances. Space charge issues, even in transport lines as simple as a drift section, have to be carefully taken into account since they can degrade the beam quality, preventing any further application of such electron beams. We analyse the space charge effects within an electron bunch with numerical simulations in order to assess their effect on the beam. We use LPA beam parameters published in previous experimental studies. These studies can give an indication of the working point where space charge can dominate the beam dynamics and has to be taken into account in the application of such beams.

DESIGN OF A 2 kA, 30 fs RF-PHOTOINJECTOR FOR WATERBAG COMPRESSION

2007 ◽  
Vol 22 (22) ◽  
pp. 4000-4005 ◽  
Author(s):  
S. B. VAN DER GEER ◽  
O. J. LUITEN ◽  
M. J. DE LOOS
Keyword(s):  
Space Charge ◽  
Half Cell ◽  
Charge Effects ◽  
High Brightness ◽  
Electron Bunches ◽  
3D Space ◽  
Rf Photoinjector ◽  
Booster Compressor ◽  
Set Up ◽  
Ballistic Bunching

Because uniformly filled ellipsoidal ‘waterbag’ bunches have linear self-fields in all dimensions, they do not suffer from space-charge induced brightness degradation. This in turn allows very efficient longitudinal compression of high-brightness bunches at sub or mildly relativistic energies, a parameter regime inaccessible up to now due to detrimental effects of non-linear space-charge forces. To demonstrate the feasibility of this approach, we investigate ballistic bunching of 1 MeV, 100 pC waterbag electron bunches, created in a half-cell rf-photogun, by means of a two-cell booster-compressor. Detailed GPT simulations of this table-top set-up are presented, including realistic fields, 3D space-charge effects, path-length differences and image charges at the cathode. It is shown that with a single 10MW S-band klystron and fields of 100 MV/m, 2kA peak current is attainable with a pulse duration of only 30 fs at a transverse normalized emittance of 1.5 μm.

scholarly journals Design of a THz-driven compact relativistic electron source

2021 ◽  
Vol 127 (3) ◽  
Author(s):  
Sz. Turnár ◽  
J. Hebling ◽  
J. A. Fülöp ◽  
Gy. Tóth ◽  
G. Almási ◽  
...  
Keyword(s):  
Total Energy ◽  
Numerical Simulations ◽  
Relativistic Electron ◽  
Electron Accelerator ◽  
Low Frequency ◽  
Target Duration ◽  
Propagation Direction ◽  
Single Cycle ◽  
Two Stage ◽  
Electron Bunches

AbstractA THz-pulse-driven compact, < 150 mm in total length, two-stage electron accelerator setup was designed. It uses 2 × 2 pairs of nearly counter-propagating focused THz pulses. The effects of the initial bunch charge and the propagation direction of the THz pulses on the energy of the accelerated electrons were investigated by numerical simulations. Generation of 8 fC electron bunches with up to 340 keV energy; only 2.0% energy spread and compressed on-target duration of 200 fs is predicted using single-cycle low-frequency THz pulses with less than 4.5 mJ total energy.

scholarly journals MAXIMIZING BRIGHTNESS IN PHOTOINJECTORS

2007 ◽  
Vol 22 (22) ◽  
pp. 3864-3881 ◽  
Author(s):  
C. LIMBORG-DEPREY ◽  
H. TOMIZAWA
Keyword(s):  
Laser Pulse ◽  
Space Charge ◽  
Numerical Simulations ◽  
Electron Distribution ◽  
Laser Pulses ◽  
Charge Effects ◽  
Emittance Growth ◽  
Transverse Emittance ◽  
Standard Linear ◽  
Very High

If the laser pulse driving photoinjectors could be arbitrarily shaped, the emittance growth induced by space charge effects could be totally compensated for. In particular, for RF guns, the photo-electron distribution leaving the cathode should be close to a uniform distribution contained in a 3D-ellipsoid contour. For photo-cathodes which have very fast emission times, and assuming a perfectly uniform emitting surface, this could be achieved by shaping the laser in a pulse of constant fluence and limited in space by a 3D-ellipsoid contour. Simulations show that in such conditions, with the standard linear emittance compensation, the emittance at the end of the photo-injector beamline approaches the minimum value imposed by the cathode emittance. Brightness, which is expressed as the ratio of peak current over the product of the two transverse emittance, seems to be maximized for small charges. Numerical simulations also show that for very high charge per bunch (10nC), emittances as small as 2 mm-mrad could be reached by using 3D-ellipsoidal laser pulses in an S-Band gun. The production of 3D-ellipsoidal pulses is very challenging, but seems worthwhile the effort. We briefly discuss some of the present ideas and difficulties of achieving such pulses.

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