BeAl beam pipe

small	Jan 2000 Al beam pipe adapter made at DESY
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small	Al-Al weld made at DESY Brush-Wellman will cut here and insert the BeAl section
small	Test flanges added
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small	Test at Hall North pump stand
	DESY pump test stand with mass spectrograph
small	Beam pipe transport box: to and fram California
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small	Data logger for temperature
small	Shock detector
small	Tilt indicator
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small	Apr 2000 Form for elliptical BeAl pipe at Brush-Wellman
small	30.10.2000 at Brush-Wellman Electrofusion, Fremont, CA, USA
small	Beam pipe in bake out form, with test flange
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small	Al-Al weld hat a small leak. Taped for test. Fixed by now.
small	Karsten Gadow inspects the BeAl welds
small	Inspection
small	Elliptical BeAl-Al welds were difficult
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small	Inspection
small	Checking dimensions: OK
small	The ellipse has 64x127 mm^2 outer diameters
small	PC notebook DAQ for overnight overpressure test
small	Screen shots as back-up
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small	End of the pressure tank
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small	The overpressure test setup
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small	Beam pipe inside the pressure tank
small	31.10.2000 Next morning: still intact!
small	After the pressure test
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small	A relieved upgrade coordinator and a confident Bob Bender from B-W
small	The welds
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small	14.11.2000 BeAl beam pipe arrived safely at DESY
small	Hall North: Warning label
small	Dec 2000: Cut test flanges in DESY work shop
small	Secondary synchrotron radiation absorbers W-Ag-Cu, fixed inside the beam pipe
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small	22.12.2000: Central beam pipe fully assembled - and vacuum tight!
half	We also have an all-aluminum spare pipe!
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half	The minimal size of -z end 'flange' of the central beam pipe (at -1.47m) allows the insertion of the silicon trackers
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half	The bellows contained travel limiters made from brass (copper-zinc) Zinc has a low sublimation point and should not be used in ultra-high vacuum applications We replace the brass by bronze (copper-tin), which is OK
half	Several PT100 temperature sensors are added along the pipe
half	Each PT100 is monitored as a 4-point probe Measure voltage drop over the variable resistor with a fixed current
half	PT100 on the BeAl section The white Rohacell spacer carries the Mylar foil for N2 flow
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half	The beam pipe is moved to the installation position
half	GO magnet and central beam pipe on the installation beam
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half	Leopold Obartuch fixes the GOA magnet support
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half	GOA support will hold the GO magnet in the cryostat
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half	The bellow and flange will be removed for insertion
half	The full assembly. Passed vacuum test Armaflex thermal insulation still to be added around the GO magnet
half	The beam pipe bellow in front of GO
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half	Pipe for N2 flow
half	The Mylar foil around the central beam pipe is still missing
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half	Temperature readout cables neatly bundled
half	Region around GO internal support 'keys' covered with 1mm Cu to prevent undercooling and condensation
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half	View into the beam pipe. Synchrotron radiation collimators are visible
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