1 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma NSLS-II Frontends and Canted Wigglers Options Sushil Sharma

2 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma ID Beamline BM Beamline ID Frontend BM Frontend Schematic Layout of a Cell ID and BM Frontends BM Photon Shutter Slow Gate valve Bremsstrahlung Stop Configuration without a Frontend Exit Port Beam

3 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma Slow Gate Valve Fixed Mask XBPM1 Lead Collimator Photon Shutter Fast Gate Valve XBPM2 Safety Shutter Typical NSLS-II Frontend  Only one fixed mask and one photon shutter are used in a frontend.  The BM photon shutter before the slow gate valve eliminates the need for another slow gate valve in the frontend. BM Photon Shutter

4 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma APS fixed mask design Lead CollimatorPhoton shutter Safety shutters XBPM Frontend Components

5 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma Front end – Thermal Analysis For the front-end components the calculated temperature is ~ 430 ºC  a thermal fatigue life of greater than 10,000 cycles. Glidcop 7.4 m 0.5 m

6 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma Typical Chamber Cross-Section Dipole Chamber - 1 Canted Wigglers Option 10.3 m

7 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma Bellows assemblies are required to accommodate thermal expansions of the chambers during bakeout and misalignment of the flanges. Two bellows assemblies (inboard and outboard) are preferable considering beam impedance, cost and schedule. Hardware or “crotch” between the two bellows assemblies must be protected by a crotch absorber. Wiggler Absorber Chamber 2Chamber 3 Crotch Absorber Canted Wigglers Option – contd.

8 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma 6 mrad 4 mrad Canted Wigglers Option – contd.  The wiggler(s) fan is limited to ~ 6 mrad, which is trimmed to ~ 4 mrad by the wiggler absorber, in order to get the fan out to the frontend. A significantly larger fan will require extensive modifications of the chambers, absorbers and magnets.  The new wigglers with a fan of ± 2.3 mrad can be canted to ~ 2 mrad. Fans of New Canted Wigglers at 10 m

9 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma  The crotch absorber intercepts 814 W at a normal peak power density of 0.25kW/mm 2. A maximum temperature of 105 ºC is calculated.  The total intercepted power by the wiggler absorber is 11 kW out of 65 kW. This results in a maximum temperature of 427 ºC. A fatigue life of > 10,000 cycles is expected. SR Absorbers – Thermal Analyses Crotch Absorber Wiggler Absorber

10 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma APS Exit Port Magnet Modifications for Exit ports Wiggler Absorber Exit Port NSLS-II Wiggler Exit Port

11 BROOKHAVEN SCIENCE ASSOCIATES EFAC Review – May 11, 2007 S. Sharma Summary:  Preliminary design and analysis of the ID, wiggler and BM frontends are in progress.  Wiggler(s) radiation fan must be limited to approximately ± 3 mrad in order to use the standard aluminum extrusions, absorbers, exit ports and associated magnets.  Wigglers with a fan of approximately ± 2.3 mrad fan can be canted to ~ 2 mrad.