Publications de Ishkhan Gorgisyan

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

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

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

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

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

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

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

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

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