Single shot longitudinal bunch profile measurements by temporally resolved electro-optical detection

TY - GEN

T1 - Single shot longitudinal bunch profile measurements by temporally resolved electro-optical detection

AU - Phillips, P.J.

AU - Gillespie, W. A.

AU - Steffen, B.

AU - Knabbe, E.-A.

AU - Schmidt, B.

AU - Schmüser, P.

AU - Jamison, S.P.

AU - Berden, G.

AU - Van Der Meer, A.F.G.

AU - MacLeod, A.M.

PY - 2007

Y1 - 2007

N2 - For the high gain operation of a SASE FEL, extremely short electron bunches are essential to generate sufficiently high peak currents. At the superconducting linac of FLASH at DESY, we have installed an electro-optic measurement system to probe the time structure of the electric field of single ~100 fs electron bunches. In this technique, the field induced birefringence in an electro-optic crystal is encoded on a chirped picosecond laser pulse. The longitudinal electric field profile of the electron bunch is then obtained from the encoded optical pulse by a single shot cross correlation with a 35 fs laser pulse using a second harmonic crystal (temporal decoding). An electro-optical signal exhibiting a feature with 118 fs FWHM was observed, and this is close to the limit of resolution due to the material properties of the particular electro-optic crystal used. The measured electro-optic signals are compared to bunch shapes simultaneously measured with a transverse deflecting cavity.

AB - For the high gain operation of a SASE FEL, extremely short electron bunches are essential to generate sufficiently high peak currents. At the superconducting linac of FLASH at DESY, we have installed an electro-optic measurement system to probe the time structure of the electric field of single ~100 fs electron bunches. In this technique, the field induced birefringence in an electro-optic crystal is encoded on a chirped picosecond laser pulse. The longitudinal electric field profile of the electron bunch is then obtained from the encoded optical pulse by a single shot cross correlation with a 35 fs laser pulse using a second harmonic crystal (temporal decoding). An electro-optical signal exhibiting a feature with 118 fs FWHM was observed, and this is close to the limit of resolution due to the material properties of the particular electro-optic crystal used. The measured electro-optic signals are compared to bunch shapes simultaneously measured with a transverse deflecting cavity.

UR - https://www.scopus.com/pages/publications/84879914071

M3 - Conference contribution

AN - SCOPUS:84879914071

SP - 221

EP - 223

BT - 8th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators

T2 - 8th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, DIPAC 2007

Y2 - 20 May 2007 through 23 May 2007

ER -