# Presentation: 564968

## P4 Shutter ReviewMay , 2005

**P4 – ID Movable Beam Stop and Integral Shutters**
- Presented by K. Beyer and T. Lutes

## Acknowledgements

- Thanks to the following people for contributing reference information
- APS Staff
- Mohan Ramanathan
- Deming Shu
- P.K. Job

## P4 Shutter: Features

- There are nine (9) P4 shutters at the APS as of May 2005.
- All have the ability to stop **Insertion Device** (**ID**) White Beam, or let it pass downstream
- When passing White beam through the shutter, Bremsstrahlung radiation is collimated by a tungsten stop with an aperture

## P4 Shutter Locations

- P4-20
- 1-ID-A
- 7-ID-A
- 12-ID-A
- P4-15
- 15-ID-A
- P4-30 (39)
- 4-ID-A
- P4-40
- 4-ID-B
- P4-50
- 32-ID-A
- 31-ID-C
- 24-ID-B

## P4-20 Internal components

- (1) Movable, glid-cop/copper, water cooled, white beam stop (also used in the P2 shutter)
- Stopping power ~ 6,000 Watts
- Incidence angle = 2.5°
- (2) Movable monochromatic beam stops
- Stopping power ~ 10 Watts
- (1) Movable tungsten safety stop/collimator
- Aperture = 18 mm (h) x 80 mm (w)

## P4-20 Shutter Side View

- Mono-shutter Assemblies

- White Beam Stop
**(Incidence angle = 2.5****°)**

- Bremsstrahlung collimator
**(18 mm x 80 mm)**

- Vacuum pump port

**Position sensor port**
**(never implemented)**

**Mono- beam**

**White beam**

## P4-20 Shutter Mode Keys

- White Beam Stop lock and pin

- Mono- Beam Stop lock and pin

- Safety Stop lock and pin

## P4-20 : White Beam Mode

- Mono Shutter key secured in cylinder lock
- White Beam Stop key secured in PSS panel
- Safety Shutter key secured in PSS panel

- White beam passes above the absorber and travels through the collimator.
- Bremsstrahlung radiation is collimated via the        80 mm x 18 mm aperture.

## P4-20 : Bremsstrahlung Collimation

-   White beam and Bremsstrahlung impinge on the aperture
- The small White beam spot passes completely through the aperture
-   Bremsstrahlung radiation is collimated (constrained) by the       18 mm x 80 mm opening
- In White beam Mode, the shutter acts like a beam transport tube with a Bremsstrahlung collimator inside

## P4-20 : Mono- Beam Mode

- P4 Mono Shutter key secured in PSS panel
- P4 White Beam Stop key secured in cylinder lock
- P4 Safety Shutter key secured in cylinder lock

- White beam is intercepted by the absorber and stops.
- Bremsstrahlung radiation is stopped by the tungsten in the collimator block.

## P4 Shutter Modifications

- The P4 shutter evolved as a result of several factors:
- Experience
- Discussion with other beamlines who were using previous versions of the device
- Complexity
- Desire for the elimination of mode changes
- Cost
- Fabrication of certain pieces was expensive
- Flexibility
- Sometimes used as a Mono- shutter (with the desire for White beam use in the future)

## P4-30 : Shutter Side View

- White Beam Stop
**(Incidence angle = 3****°)**

- Bremsstrahlung collimator
**(14 mm x 16 mm)**

## P4-30 : 4-ID-A

- No mode change
- White beam absorber is redundant to FE Shutter (PS2)
- Standard S3-30 collimator follows White beam absorber

- In 4-ID-A there are 2 mirrors upstream of the P4-30 that need to be kept warm.  This device is like having a second PS2.

## P4-30 : White Beam Absorber

- When the absorber is down (shutter closed), the White beam intercepts the walls    (3° incident angle)     and is stopped.
- When the absorber is up (shutter open), the aperture aligns with the White beam and allows it to pass through.
**Aperture = 5.5 mm x 5.5 mm**

## P4-39 : White Beam Absorber

- The White beam absorber has been modified such that it can accept photons from two ID sources.
- When the absorber is up (shutter open), the aperture aligns with the 2 White beams and allows them to pass through.
**Aperture = 6 mm x 14 mm**

## P4-30 : Bremsstralung Collimation

-   White beam and Bremsstrahlung impinge on the aperture
- The small White beam spot passes completely through the aperture
-   Bremsstrahlung radiation is collimated (constrained) by the       14 mm x 16 mm aperture

- This view of the S3-30 collimator is from the downstream end looking upstream

## P4-40 : 4-ID-B

- No mode change
- Standard S3-30 collimator follows White beam absorber
- Will stop White Beam, Pink Beam, and Mono- Beam

- The White beam absorber is smaller than the in the P4-39. The power density decreases because the beam is divergent. The absorber does not need to be as large due to the distance from the ID source (~60 m).

## P4-40 : White Beam Absorber

-   The thin surface is made of glid-cop.  The larger block is copper.  The two are explosively bonded together.
-   Incident angle = 8°
-   Cooling is directed down the center of the actuator.

- (Top View)

## P4-15 Shutter Side View

- Pink, Mono-shutter Assemblies

- Bremsstrahlung collimator
**(12mm x 16 mm White Beam)**
**(50mm x 16 mm Pink, Mono- Beam)**

- White Beam Absorber
**(Incidence angle = 4.5°)**

**Mono- beam**

**White beam**

## P4-15 Shutter Mode Keys

- White beam Absorber lock and pin

- Pink, Mono- beam Stop locks and pins

- Safety Stop lock and pin

## P4-15 : White Beam Absorber

- When the White beam absorber is down (Mono- mode), the White beam intercepts the walls
- (4.5° incident angle)
- and is stopped.

## P4-15 : Pink Beam Absorber

- When the Pink beam absorber is down (shutter closed), the Pink beam intercepts the walls
- (16° incident angle)
- and is stopped.
- This absorber also acts as a Mono- stop.

## P4-15 : Collimator Block

- White beam aperture
**(12 mm x 16 mm)**

- Mono- beam aperture
- Pink beam aperture
**(50 mm x 16 mm)**

## P4-15 : White Beam Mode

- P4 shutter was redesigned by ChemMatCARS to reduce cost and to operate in White beam, Pink beam, and Mono- beam modes.

- In White beam mode, the Pink/Mono- shutters are locked in the open position and the keys are captured in the PSS panel
- The absorber is lowered and White beam travels above it
- The Safety Stop is lowered to allow White beam to pass and Bremsstrahlung radiation is collimated by the 12 mm x 16 mm aperture.

## P4-15 : Pink, Mono- Beam Mode

-   In Pink/Mono- beam mode, the White beam absorber is raised and locked in place to intercept the White beam
-   The Safety Stop is lowered to absorb Bremsstrahlung radiation AND its upper aperture allows the less intense beams to pass through.

## P4-50 : 24-ID-B, 31-ID-C, 32-ID-A

- Fixed White beam stop
- Standard S3-30 collimator follows the White beam stop
- Mode change occurs by moving the **entire device** upward

## P4-50 : Shutter Side View

- S3-30 Collimator

- Fixed White Beam Absorber
**Aperture = 8 mm x 10 mm**

## P4-50 : Shutter Mode Keys

- Mono- stop lock and key(s)

- Shutter table lock and key

## P4-50 : 32-ID-A Absorber

- Absorber is fixed in place.  It has no moving cylinder.

## P4-50 : Administrative Restrictions

- The ability to change modes has been inhibited.  Downstream stations are not verified for White Beam.
- 24-ID-B & 31-ID-C have had their Mono- shutter locks completely  removed
- 32-ID-A has had its Mono- shutter keys placed under Configuration Control