Light Sources and FELs
Tech 14: Vacuum Technology

Paper	Title	Page
THP218	Design Concept for a Modular In-vacuum Hall Probe Mapper for use with CPMU Convertible In-vacuum Undulators of Varying Magnetic Length	2534
	J. Rank, D.A. Harder, G. Rakowsky, T. Tanabe BNL, Upton, Long Island, New York, USA
	Funding: NSLS-II, Brookhaven National Laboratory, working under the U.S. DOE, Contract No.DE-AC02-98CH10886. Both In-Vacuum Undulators (IVU) and Cryogenic Permanent Magnet Undulators (CPMU), each important to third generation light sources, are best characterized in their operating environment. To create a precise Hall probe map of an IVU/CPMU (IVU hereafter), an In-Vacuum Magnetic Measurement (IVMM) System is proposed. Point-by-point measurement of field and trajectory error at operating conditions informs corrective tuning. A novel design concept for a universal IVMM System has been developed and explored. The IVMM seals to the rectangular UHV-flange of the IVU and shares its common vacuum space. Moreover, a modular design permits a range of IVU of varying magnetic length to be mapped with a single IVMM System, and is thus cost effective when multiple IVU of different configuration are planned. Here we review aspects of the modular IVMM design concept.