Publications de Ishkhan Gorgisyan

Experimental study of wakefields driven by a self-modulating proton bunch in plasma

Patrick Blanchard, Ambrogio Fasoli, Alan Howling, Ivo Furno, Yanis Andrebe, Sun Hee Kim, Rémy Jacquier, Ishkhan Gorgisyan, Riccardo Agnello, Yiming Li, Shuai Liu

We study experimentally the longitudinal and transverse wakefields driven by a highly relativistic proton bunch during self-modulation in plasma. We show that the wakefields' growth and amplitude increase with increasing seed amplitude as well as with the ...

2020

Proton Bunch Self-Modulation in Plasma with Density Gradient

Patrick Blanchard, Ambrogio Fasoli, Alan Howling, Ivo Furno, Samuel Rey-Mermet, Yanis Andrebe, Ishkhan Gorgisyan, Amarasinghage Tharindu Dasun Perera

We study experimentally the effect of linear plasma density gradients on the self-modulation of a 400 GeV proton bunch. Results show that a positive or negative gradient increases or decreases the number of microbunches and the relative charge per microbun ...

2020

Experimental Observation of Plasma Wakefield Growth Driven by the Seeded Self-Modulation of a Proton Bunch

Sun Hee Kim, Gennady Plyushchev, Ishkhan Gorgisyan, Sijie Liu, Michele Marin, Yiming Li, Shuai Liu

We measure the effects of transverse wakefields driven by a relativistic proton bunch in plasma with densities of 2.1 x 10(14) and 7.7 x 10(14) electrons/cm(3). We show that these wakefields periodically defocus the proton bunch itself, consistently with t ...

2019

Femtosecond pulse length and arrival time measurement of hard X-Ray FELs

Ishkhan Gorgisyan

The ultra-bright short-pulsed radiation provided by the free electron lasers (FEL) is used for many new discoveries in different fields of science and industry. The advancement of the FEL technologies allows the generation of shorter photon pulses with hig ...

EPFL2016

A scheme for a shot-to-shot, femtosecond-resolved pulse length and arrival time measurement of free electron laser x-ray pulses that overcomes the time jitter problem between the FEL and the laser

Fernando Ardana Lamas, Christoph Peter Hauri, Ishkhan Gorgisyan, Rasmus Ischebeck

The recent entry of X-ray free electron lasers (FELs) to all fields of physics has created an enormous need, both from scientists and operators, for better characterization of the beam created by these facilities. Of particular interest is the measurement ...

Institute of Physics2014

THz streaking of attosecond pulse trains

Fernando Ardana Lamas, Christoph Peter Hauri, Ishkhan Gorgisyan

OSA2014

High-precision x-ray FEL pulse arrival time measurements at SACLA by a THz streak camera with Xe clusters

Leonid Rivkin, Christoph Peter Hauri, Ishkhan Gorgisyan, Rasmus Ischebeck, Junqiu Liu

The accurate measurement of the arrival time of a hard X-ray free electron laser (FEL) pulse with respect to a laser is of utmost importance for pump-probe experiments proposed or carried out at FEL facilities around the world. This manuscript presents the ...

Optical Society of America2014