P5 & P7 Shutter ReviewFebruary 8, 2005

P5 Shutters – ID Fixed Beam Stop and Integral ShutterPresented by P. Pedergnana and W. VanWingeren

P7 Shutters – BM Fixed Beam Stop and Integral ShutterPresented by R. Monroe and J. Ullian

Acknowledgements

Thanks to the following people for contributing reference information

PNC-CAT personnelRobert Gordon, Dale Brewe, Mike Pape

APS StaffMohan 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 LocationsP5 Shutters P7 Shutters

P5 3-ID-A 6-ID-A 7-ID-B-MH-1 20-ID-A

P5-70 1-ID-B

P5 Inverted 10-ID-A 17-ID-A

P5 Modified 5-ID-A 33-ID-C

P7-20 8-BM-A

P7-23 20-BM-A

P7-30 33-BM-A

P7-90 1-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 downstreamOne 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