Absorber
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Intensity Absorber - Photon Shutter

Intensity Absorber - Photon Shutter

Intensity Absorber - Photon Shutter

Radiation Absorber

Radiationabsorber

BESSY II Synchrotron Light Source
Motorized and watercooled Radiationabsorber

Radiationabsorber

ANKA Synchrotron Light Source
Spezial watercooled Radiationabsorber for Infrared Beamline Port

Radiationabsorber

Swiss Light Source
Adjustable watercooled Radiationabsorber

Radiationabsorber

Swiss Light Source
Adjustable watercooled Radiationabsorber

Radiationabsorber

Swiss Light Source
Adjustable watercooled Radiationabsorber

Radiationabsorber

Swiss Light Source
Watercooled Radiationabsorber in a Vacuum Chamber

Radiationabsorber

Swiss Light Source
Watercooled Radiationabsorber in a Vacuum Chamber

Wedge Plates or Crotch Absorber

Crotch Absorber

Radiationabsorber

Crotch-Absorber

Radiationabsorber

Crotch-Absorber

Radiationabsorber

Crotch-Absorber

Straight Chamber with Crotch-Absorber.

SLS Vacuum system

Crotch-Absorber Figure

Crotch-Absorber Figure



Beschreibungen

Intensity Absorber - Photon Shutter

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Technische Beschreibung


The Absorber serves to absorb the synchrotron radiation and to carry away the related heat capacity of the absorber body by way of water cooling.

The absorber insert consists of

  • the basic flange (DN 100 CF),
  • the absorber body,
  • in standard design made of OFHC copper or Glidcop®,
  • an OFHC copper coil (6 x 1) vacuum-brazed to the back and serving as water cooling,
  • -a bar-like support assembly which is atmospherically sealed using a membrane bellows, and
  • -a pneumatic cylinder equipped with 2 proximity switches used as end switches.

The pneumatic cylinder is double-acting. In case of a loss of media (compressed air, voltage) the absorber moves into the beam path.
The electrical proximity switches can be exchanged against mechanical micro switches.
The positioning and arrangement of the intensity absorber in the front end is made together with a 150l/s ion pump, the all-metal gate valve, a fast-closing valve and a small chamber on a separate steel column with an x, y, z adjusting frame.

Technische Daten


Overall dimensions
-Base flange:
-Height:

CF 100 ( bigger O.R. )
about 750 mm

Active length in beam direction: appr. 80 mm

Aperture: appr. 20 x 10 mm2

Heat load: appr. 4 kW

Absorber material: OFHC-Copper or Glidcop®

Absorber stroke: 50 mm

Cooling water connection: Swagelok

Cooling water pipe: tube 6x1, copper

Leakage rate: <1 x 10-10mbar • l • s-1

Compressed air: 6 bar



 

Radiation Absorber

Wedge Plates or Crotch Absorber

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Technische Beschreibung


Wedge plates absorbers (also referred to as Crotch absorbers) are absorbers predominantly inserted in the crotch part of a dipole chamber. They are suitable for wide flat shaped photon beams with high total powers as well as for high power densities.
A wedge plates absorber consists of two separate plates fixed in a base flange. Each plate has a number of parallel wedges with intermediate grooves on the absorbing side. The wedges of each plate fit the grooves of the other plate without contact. The plates can expand under heat load with moderate stress generation (S. Hermle et al; Proceedings of PAC 1999, New York, p.1360-1362). For radiation the gap between the plates is fully closed apart from the customer specified aperture(s).
Size and geometry of the plates will be adapted to the beam characteristics at the place of the absorber in order to achieve safe absorption.
The plates are made of a copper material and can be water-cooled independently or in-line to resist the thermal load of the radiation source.

Technische Daten


Type:
Wedge plates absorber insert

Number of plates: 2

Plate material: OFHC-Copper / Glidcop on request

Plate design and dimensions: Suggested by FMB,
dependent on beam specifications at installation position

Number. of apertures /
aperture dimensions:

As specified by customer

Maximum absorbed power /
thermal power density:
5 kW and more, dependent on space available at
installation position / up to 50 W/mm² (with Glidcop,
design-dependent)

Cooling: Water cooling

Cooling scheme: Plates independent or in-line by outer connection

Base flange: DN 63/100/150 CF fixed  (others on customer request)

Flange material: 1.4429 (similar 316LN)  (others on customer request)

FEA calculation:
FEA calculation report for thermal and stress analysis

Temperature measurement:
(optional)

1 / 2 thermocouple K-type in plate(s),
Feedthrough miniature TC flat pin
(others on customer request)

Manual aligner (optional):

Manual absorber alignment;
normal to port ± 3 mm (resolution < 0.1 mm), tilt ± 2 deg

Figures


Figure 1

Photon Absorber in a Quadrupole Chamber
(PSI – SLS)


Figure 2

Splitted Crotch Absorber


Figure 3

Straight Vacuum Chamber Riva- CGM2
incl. two absorbers (PSI – SLS)