FEL2011 - List of Keywords (insertion-device)

Paper	Title	Other Keywords	Page
WEPA22	Development of Insertion Devices Measurement System at IHEP	undulator, alignment, insertion, controls	381
	W. Chen, X. Feng, H.H. Lu, C. Shi, Y. Yang, J.C. Zhang IHEP, Beijing, People's Republic of China
	In the cooperation between IHEP and EXFEL, prototype undulator U48 for EXFEL is developed by IHEP. In order to meet, maintain and verify the ID’s magnetic performance, a magnetic measurement system has been developed. The development status of the system at IHEP is described in this paper. A 6.5 m long measurement bench with hall probe and small coil is used to measure the vertical and horizontal components of the Insertion Device magnetic field. The measurement system includes a precise granite bench to position and move the magnetic sensors, motion control part and data acquisition part. The characteristics and performances of the magnetic measurement system are presented.

WEPA24	Error Analysis for Hybrid Undulators	undulator, insertion, free-electron-laser, laser	387
	D. Arbelaez, A. Madur, S. Marks, S. Prestemon, D. Schlueter LBNL, Berkeley, California, USA H.-D. Nuhn SLAC, Menlo Park, California, USA
	Funding: This work was supported by the Director, Office of Science, of the US Department of Energy under Contract No. DE-AC02-05CH11231. An analysis is performed on various possible errors that may occur throughout a hybrid undulator. Of particular significance is the scaling of the various errors with variations in the gap of the device. Tuning strategies are considered for the mitigation of these errors for the entire range of usable gap. Sorting strategies for the reduction of the initial errors in the undulator are also considered. Specifically, the effectiveness of the sorting algorithm is evaluated with respect to the number of permanent magnet blocks used per pole as well as the size and distribution of the block population. The results of this analysis are applied to the LCLS-II undulators to determine the required machining and positioning tolerances and viable tuning strategies in order to meet the design requirements.

Paper

Title

Other Keywords

Page

WEPA22

Development of Insertion Devices Measurement System at IHEP

undulator, alignment, insertion, controls

381

W. Chen, X. Feng, H.H. Lu, C. Shi, Y. Yang, J.C. Zhang
IHEP, Beijing, People's Republic of China

In the cooperation between IHEP and EXFEL, prototype undulator U48 for EXFEL is developed by IHEP. In order to meet, maintain and verify the ID’s magnetic performance, a magnetic measurement system has been developed. The development status of the system at IHEP is described in this paper. A 6.5 m long measurement bench with hall probe and small coil is used to measure the vertical and horizontal components of the Insertion Device magnetic field. The measurement system includes a precise granite bench to position and move the magnetic sensors, motion control part and data acquisition part. The characteristics and performances of the magnetic measurement system are presented.

WEPA24

Error Analysis for Hybrid Undulators

undulator, insertion, free-electron-laser, laser

387

D. Arbelaez, A. Madur, S. Marks, S. Prestemon, D. Schlueter
LBNL, Berkeley, California, USA
H.-D. Nuhn
SLAC, Menlo Park, California, USA

Funding: This work was supported by the Director, Office of Science, of the US Department of Energy under Contract No. DE-AC02-05CH11231.
An analysis is performed on various possible errors that may occur throughout a hybrid undulator. Of particular significance is the scaling of the various errors with variations in the gap of the device. Tuning strategies are considered for the mitigation of these errors for the entire range of usable gap. Sorting strategies for the reduction of the initial errors in the undulator are also considered. Specifically, the effectiveness of the sorting algorithm is evaluated with respect to the number of permanent magnet blocks used per pole as well as the size and distribution of the block population. The results of this analysis are applied to the LCLS-II undulators to determine the required machining and positioning tolerances and viable tuning strategies in order to meet the design requirements.