P5 & P7 Shutter Review February 8, 2005 P5 Shutters – ID Fixed Beam Stop and Integral Shutter Presented by P. Pedergnana and W. VanWingeren P7 Shutters – BM Fixed Beam Stop and Integral Shutter Presented by R. Monroe and J. Ullian

Acknowledgements Thanks to the following people for contributing reference information PNC-CAT personnel Robert Gordon, Dale Brewe, Mike Pape APS Staff Mohan Ramanathan, Deming Shu, Joe Gagliano, Ali Mashayekhi, Dean Haeffner, Nena Moonier

P5 & P7 Common Characteristics Downstream of a double- crystal monochromator (DCM) DCM shifts mono beam 35 mm above white beam Located ~30 m from source Water-cooled fixed white beam stop Fixed Safety Stop Stop/collimator Constructed of tungsten Designed to stop Bremsstrahlung radiation Integral Shutters Double redundant mono shutters Tungsten construction Movable/capable of stopping or passing mono beam downstream

P5 Shutter Side View The fixed white beam stop takes the thermal load White Beam Mono Beam The fixed safety stop stops Bremsstrahlung radiation

Shutter Differences P5 P7 Used in ID beamlines Fixed White Beam Stop Constructed of Glid- cop/copper material 3800 W maximum stopping power Optical aperture area: 80 mm (H) x 18 mm (V) Mask grazing incident angle: 4.5 degrees Used in BM beamlines Fixed White Beam Stop Constructed of copper material 1580 W maximum stopping power Optical aperture area: 120 mm (H) x 18 mm (V) Mask grazing incident angle: 90.0 degrees

Shutter Locations P5 Shutters P7 Shutters P5 3-ID-A 6-ID-A 7-ID-B-MH-1 20-ID-A P ID-B P5 Inverted 10-ID-A 17-ID-A P5 Modified 5-ID-A 33-ID-C P BM-A P BM-A P BM-A P BM-B

P5 Shutter Located at 20-ID-A NOTE: The fixed safety stop and integral shutters have the same characteristics on both the P5 and the P7.

1-ID-B Assembly of P5 FIXED WHITE BEAM STOP Water-cooled and constructed of Glid-cop/copper material Maximum stopping power ~ 3,800 watts Optical aperture area: 80mm (H) x 18 mm (V) Mask grazing incident angle: 4.5 degrees

20-ID-A Fixed Safety Stop Stop/collimator (collimator being built in this picture) Constructed of tungsten blocks, middle has slot for beam Designed to stop Bremsstrahlung radiation

Assembly of P5 Shutter at 20-ID-A NOTE: Photos taken prior to installation General characteristics: Double redundant mono shutters 2 tungsten blocks attached to copper shafts Movable/capable of stopping or passing mono beam downstream One mono shutter in test stand (disassembled) Looking upstream through P5 integral shutters Bellows Copper mount Tungsten block

P5 Inverted at 10-ID-A & 17-ID-A Fixed white beam stop is inverted to stop white beam that travels above mono beam

P5 Modified at 5-ID-A White beam stop is located upstream of shutter, but fixed (Bremsstrahlung) stop is located downstream of integral shutters.

P7-20 Shutter Schematic

P7-90 White Beam Stop Schematic

1-BM-B Assembly of P7 FIXED WHITE BEAM STOP Water-cooled and constructed of copper material Maximum stopping power ~1,580 watts Optical aperture area: 120 mm (H) x 18 mm (V) Mask grazing incident angle: 90.0 degrees

P7-90 vs. Other P5 & P7 Shutters Stops and shutters are on separate tables Consists of a white beam stop and safety stop Both are fixed to block white beam and pass mono beam Typically followed by P8 double redundant mono beam shutters

P5 and P7 Shutter Failure Modes Failure of bellows surrounding shaft, resulting in vacuum leaks Example: recent repairs at 8-BM and 8-ID Failure of cylinder cup seals, resulting in excess friction and/or air leaks Due to improper lubrication or incompatible parts All shutters are designed to fail safe Piston has fixed stop to prevent tungsten block from dropping below beam path Plate welded along bottom of shutter chamber in case of shaft breakage