1 brookhaven science associates efac review – may 11, 2007 s. sharma nsls-ii frontends and canted...

1 BROOKHAVEN SCIENCE ASSOCIATES

EFAC Review – May 11, 2007S. Sharma

NSLS-II Frontends and Canted Wigglers Options

Sushil Sharma



ID Beamline

BMBeamline

ID Frontend

BM Frontend

Schematic Layout of a Cell

ID and BM Frontends

BM Photon Shutter

Slow Gate valve

Bremsstrahlung Stop

Configuration without a FrontendExit Port

Beam



Slow GateValve

Fixed Mask

XBPM1

LeadCollimator

PhotonShutter

Fast GateValve

XBPM2

SafetyShutter

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 PhotonShutter



APS fixed mask design

Lead Collimator Photon shutter

Safety shutters

XBPM

Frontend Components



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



Typical Chamber Cross-Section

Dipole Chamber - 1

Canted Wigglers Option

10.3 m



• 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

Wiggler Absorber

Chamber 2 Chamber 3

Crotch Absorber

Crotch Absorber

Canted Wigglers Option – contd.



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



The crotch absorber intercepts 814 W at a normal peak power density of 0.25kW/mm2. 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



APS Exit Port

Magnet Modifications for Exit ports

Wiggler Absorber Exit Port

NSLS-II Wiggler Exit Port



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.

1 brookhaven science associates efac review – may 11, 2007 s. sharma nsls-ii frontends and canted...

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