RIA Spectrograph working group.
Experience at existing fast beam facilities (such as the NSCL) indicate that a high-acceptance, high-resolution spectrograph is a critical part of the research equipment. At RIA the fragment separators will not be available to perform this function as they do at, for example, GSI. Hence, a dedicated spectrometer that has 1 part in 5,000 to 20,000 momentum resolution, a 5 to 10% momentum acceptance, and a 10 to 20 msr solid angle will be necessary.

This device will be necessary for most of the experimental program with fast beams. It's primary use will likely be for the study of knockout reaction and charge exchange, however it will also be useful for particle identification in connection with gamma-ray coincidence experiments. It could also be used for time-of-flight mass measurements for extremely weak intensity beams. Goals

• Design a magnetic spectrograph for experiments with fast beams at RIA
• Consider the infrastructure required for running the spectrograph effectively
• Delineate the requirements for the spectrograph bases on the likely experimental program
• Develop the physics program for experiments with the spectrograph
• Communicate and promote the experimental program and design to the RIA community

Links to some existing spectrographs
• The S800 Spectrograph at NSCL
• The SPEG Spectrograph at GANIL
• The GSI-FRS fragment separator
• The A1900 fragment separator at NSCL

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working group members:
Daniel Bazin (NSCL)
Brad Sherrill (NSCL)
Remco Zegers (NSCL)
Join the working group! Send an email to one of the above members.