DIPAC2011 - List of Authors (Weis, T.)

Paper	Title	Page
TUPD07	Instrumentation Needs and Solutions for the Development of an SRF Photoelectron Injector at the Energy-Recovery Linac BERLinPro	317
	R. Barday, T. Kamps, A. Neumann, J. Rudolph, S.G. Schubert, J. Völker HZB, Berlin, Germany A. Ferrarotto, T. Weis DELTA, Dortmund, Germany
	BERLinPro is an energy-recovery linac for an electron beam with 1 mm mrad normalized emittance and 100 mA average current. The initial beam parameters are determined by the performance of the electron source, an SRF photo-electron injector. Development of this source is a major part of the BERLinPro programme. The instrumentation for the first stage of the programme serves the purpose to have robust and reliable monitors for fundamental beam parameters like emittance, bunch charge, energy and energy spread. The critical issue of the second stage is the generation of an electron beam with 100 mA average current and a normalized emittance of 1 mm mrad. Therefore we plan to setup a dedicated instrumentation beamline with a compact DC gun to measure thermal emittance, current and current lifetime. In parallel an SRF gun with dedicated diagnostics will be build focused on ERL specific aspects like emittance compensation with low-energy beams and reliability of high current operation. This paper collects requirements for each development stage and discusses solutions to specific measurement problems.

TUPD71	Combined Approach using Closed-Orbit and Multiturn Data for Model-Independent and Fast Beam Optics Determination in Storage Rings	473
	B. Riemann, P. Grete, H. Huck, A. Nowaczyk, T. Weis DELTA, Dortmund, Germany
	Multiturn-capable BPMs have been used successfully for characterization of storage ring beam optics. While their use eases determination of optical parameters (e.g. beta function and phase) by observation of non ring-periodic beam centroid oscillation, the installation of multiturn electronics in all storage ring BPMs causes a high monetary effort. The presented method aims at combining multiturn and closed-orbit measurement methods in a cost-effective way. This is done using a single drift section in the ring, being equipped with two multiturn BPMs at its ends. Measuring the centroid motion in the full transverse phase space, one can completely determine all local beam optics parameters inside the drift space. Then, four additional dipole correctors inside this drift are used to create closed-orbit perturbations along the ring. Because of the known drift optics, it is then possible to extract all data that would be available if all storage ring BPMs were multiturn-capable, by using only closed-orbit BPM data of the mentioned four perturbations (incl. betatron coupling). This fast and model-independent approach may be increased in accuracy by a coupled bunch feedback system.

Paper

Title

Page

Instrumentation Needs and Solutions for the Development of an SRF Photoelectron Injector at the Energy-Recovery Linac BERLinPro

317

R. Barday, T. Kamps, A. Neumann, J. Rudolph, S.G. Schubert, J. Völker
HZB, Berlin, Germany
A. Ferrarotto, T. Weis
DELTA, Dortmund, Germany

BERLinPro is an energy-recovery linac for an electron beam with 1 mm mrad normalized emittance and 100 mA average current. The initial beam parameters are determined by the performance of the electron source, an SRF photo-electron injector. Development of this source is a major part of the BERLinPro programme. The instrumentation for the first stage of the programme serves the purpose to have robust and reliable monitors for fundamental beam parameters like emittance, bunch charge, energy and energy spread. The critical issue of the second stage is the generation of an electron beam with 100 mA average current and a normalized emittance of 1 mm mrad. Therefore we plan to setup a dedicated instrumentation beamline with a compact DC gun to measure thermal emittance, current and current lifetime. In parallel an SRF gun with dedicated diagnostics will be build focused on ERL specific aspects like emittance compensation with low-energy beams and reliability of high current operation. This paper collects requirements for each development stage and discusses solutions to specific measurement problems.

TUPD71

Combined Approach using Closed-Orbit and Multiturn Data for Model-Independent and Fast Beam Optics Determination in Storage Rings

473

B. Riemann, P. Grete, H. Huck, A. Nowaczyk, T. Weis
DELTA, Dortmund, Germany

Multiturn-capable BPMs have been used successfully for characterization of storage ring beam optics. While their use eases determination of optical parameters (e.g. beta function and phase) by observation of non ring-periodic beam centroid oscillation, the installation of multiturn electronics in all storage ring BPMs causes a high monetary effort. The presented method aims at combining multiturn and closed-orbit measurement methods in a cost-effective way. This is done using a single drift section in the ring, being equipped with two multiturn BPMs at its ends. Measuring the centroid motion in the full transverse phase space, one can completely determine all local beam optics parameters inside the drift space. Then, four additional dipole correctors inside this drift are used to create closed-orbit perturbations along the ring. Because of the known drift optics, it is then possible to extract all data that would be available if all storage ring BPMs were multiturn-capable, by using only closed-orbit BPM data of the mentioned four perturbations (incl. betatron coupling). This fast and model-independent approach may be increased in accuracy by a coupled bunch feedback system.