IBIC2012 - List of Authors (Thominet, V.G.)

Paper

Title

Page

Bunch-Compressor Transverse Profile Monitors of the SwissFEL Injector Test Facility

1

G.L. Orlandi, M. Aiba, S. Bettoni, B. Beutner, H. Brands, R. Ischebeck, P. Peier, E. Prat, T. Schietinger, V. Schlott, V.G. Thominet
PSI, Villigen, Switzerland
C. Gerth
DESY, Hamburg, Germany

The 250 MeV SwissFEL Injector Test Facility (SITF) is the test bed of the future 5.7 GeV SwissFEL linac that will drive a coherent FEL light source in the wavelength range 7-0.7 and 0.7-0.1 nm. Aim of the SITF is to demonstrate the technical feasibility of producing and measuring 10 or 200pC electron bunches with normalized emittance down to 0.25 μm. A further goal is to demonstrate that the electron beam quality is preserved in the acceleration process, in the X-Band linearizer and the magnetic compression from about 10 ps down to 200 fs. The SITF movable magnetic bunch-compressor is equipped with several CCD/CMOS cameras for monitoring the beam transverse profile and determining the beam energy spread: a Ce:YAG screen and an OTR screen camera at the mid-point of the bunch compressor and a SR camera imaging in the visible the Synchrotron Radiation emitted by the electron beam crossing the third dipole. Results on the commissioning of such instrumentations, in particular in the low charge limit, and measurements of the beam energy spread vs. the compression factor will be presented.

TUPB80

Transverse Profile Monitor for SwissFEL

R. Ischebeck, B. Beutner, E. Prat, V. Schlott, V.G. Thominet
PSI, Villigen, Switzerland

In future free electron lasers, electron and photon beam sizes range between 10 um and a few millimeters. For an initial set up of the accelerator, to confirm target parameters for optics and emittance, and to optimize the FEL for different user requests, the transverse profile of these beams has to be determined. A monitor based on a scintillating crystal as well as optical transition radiation (for the electron beam) has been designed for the SwissFEL project. It features a projected pixel size of 7 micrometers, a good resolution over a field of view of 6 mm x 15 mm, a good sensitivity (as required for the low-charge mode of SwissFEL) and a 100 Hz image readout. To test the monitor, it has been installed at the SwissFEL Injector Test Facility, where electron bunches between 10 and 200 pC can be generated. In conjunction with a transverse deflecting cavity, the profile monitor has been used to measure the time-resolved slice emittance of these bunches.

Paper	Title	Page
MOPB82	Bunch-Compressor Transverse Profile Monitors of the SwissFEL Injector Test Facility	1
	G.L. Orlandi, M. Aiba, S. Bettoni, B. Beutner, H. Brands, R. Ischebeck, P. Peier, E. Prat, T. Schietinger, V. Schlott, V.G. Thominet PSI, Villigen, Switzerland C. Gerth DESY, Hamburg, Germany
	The 250 MeV SwissFEL Injector Test Facility (SITF) is the test bed of the future 5.7 GeV SwissFEL linac that will drive a coherent FEL light source in the wavelength range 7-0.7 and 0.7-0.1 nm. Aim of the SITF is to demonstrate the technical feasibility of producing and measuring 10 or 200pC electron bunches with normalized emittance down to 0.25 μm. A further goal is to demonstrate that the electron beam quality is preserved in the acceleration process, in the X-Band linearizer and the magnetic compression from about 10 ps down to 200 fs. The SITF movable magnetic bunch-compressor is equipped with several CCD/CMOS cameras for monitoring the beam transverse profile and determining the beam energy spread: a Ce:YAG screen and an OTR screen camera at the mid-point of the bunch compressor and a SR camera imaging in the visible the Synchrotron Radiation emitted by the electron beam crossing the third dipole. Results on the commissioning of such instrumentations, in particular in the low charge limit, and measurements of the beam energy spread vs. the compression factor will be presented.

TUPB80	Transverse Profile Monitor for SwissFEL
	R. Ischebeck, B. Beutner, E. Prat, V. Schlott, V.G. Thominet PSI, Villigen, Switzerland
	In future free electron lasers, electron and photon beam sizes range between 10 um and a few millimeters. For an initial set up of the accelerator, to confirm target parameters for optics and emittance, and to optimize the FEL for different user requests, the transverse profile of these beams has to be determined. A monitor based on a scintillating crystal as well as optical transition radiation (for the electron beam) has been designed for the SwissFEL project. It features a projected pixel size of 7 micrometers, a good resolution over a field of view of 6 mm x 15 mm, a good sensitivity (as required for the low-charge mode of SwissFEL) and a 100 Hz image readout. To test the monitor, it has been installed at the SwissFEL Injector Test Facility, where electron bunches between 10 and 200 pC can be generated. In conjunction with a transverse deflecting cavity, the profile monitor has been used to measure the time-resolved slice emittance of these bunches.