XML Description of Beam Pipe Geometry  For XML description of Beam Pipe were used: Det/XmlDDDB/v6, Det/XmlEditor/v4, Det/DetDesk/v8, Vis/GaudiLab/head Det/XmlDDDB/v6, Det/XmlEditor/v4, Det/DetDesk/v8, Vis/GaudiLab/head  Engineering Drawings of Beam Pipe with last proposed numbers by Gloria (web Beam Pipe 10/7/2001, pipe7.22.cdf )  Not final description: Beam Pipe construction is under the study Galina Pakhlova ITEP, Moscow LHCb-Computing meeting CERN 27/8/2001

2 Simple elements of Beam Pipe hkhk Numbers of simple elements : Cylindrical and Conical sections Flanges, Rings and Bellows and Materials: Al, AlBeMet160,St.Steel Thickness of Pipe: from 1.0*mm to 4.0*mm

3 Bellows and Cones In XMl Description each Bellow is simplified as logvolume with 2 Conical tubes 2 Conical tubes and Cylindrical tube between Beam Pipe includes 4 Bellows 4 Bellows

4 Beam Pipe XML Description Possibility Few ways to describe Beam Pipe: Few ways to describe Beam Pipe: - Logvolume as one long material=vacuum with simple elements inside - Logvolume as one long material=vacuum with simple elements inside Detector parts are too close to Beam Pipe, clearance is too small. Detector parts are too close to Beam Pipe, clearance is too small. - Logvolume as Union of simple elements: union of and gives unpredictable result in GaudiLab/head and overlapping does not help! union of and gives unpredictable result in GaudiLab/head and overlapping does not help! - Logvolume without shape and material with simple elements inside without clearance between them. Very quick and easy description with minimum parameters, simple *.xml files, no problem with GaudiLab. Very quick and easy description with minimum parameters, simple *.xml files, no problem with GaudiLab. Problems??? May be later… Problems??? May be later… Beam Pipe was divided into 5 Pipe Sections Beam Pipe was divided into 5 Pipe Sections

5 Beam Pipe Section1 Section1 includes: Cylindrical section with Flange and Ring Conical section (25 mrad) with Flange and Ring Conical section (-37 degree) Cylindrical section with Flange 9 physvolumes Starts at Z~1m, Length~1.5m

6 Beam Pipe Section 2 Section 2 includes: 3 Conical sections (10 mrad) 2 Flanges 2 Bellows (cone+cylinder+cone) 7 physvolumes Starts at Z~2.5m, Length~0.5m

7 Beam Pipe Section 3 Section3 includes: 4 Conical sections (10 mrad) 4 Flanges Support Ring 9 physvolumes Starts at ~3m, Length ~10m

8 Beam Pipe Section 4 Section 4 includes: 3 Conical Sections (10 mrad) Flange 2 Bellows (cone+cylinder+cone) 6 physvolumes Starts at ~13m, Length~1.5m

9 Beam Pipe Section 5 Section 5 includes: 2 Conical sections (10 mrad) Conical section (-17 degree) Cylindrical section 4 physvolumes Starts at ~14.5 m, Length~5.5m

10 Visualization of Beam Pipe Beam Pipe with 5 Pipe Sections installed: 3 Cylindrical Sections 16 Conical Sections 10 Flanges 3 Rings 4 Bellows 36 physvolumes about 200 parameters Starts at Z~1m, Length~19m

11 Again about GaudiLab Again about GaudiLab Problems with GaudiLab/head: Problems with GaudiLab/head: ! No = + ! No = + ( XML Beam Pipe Description ) ( XML Beam Pipe Description ) ! No = - ! No = - general trapezoid (Magnet XML Description) general trapezoid (Magnet XML Description) ! Impossible to visualize ECAL as a whole ! Impossible to visualize ECAL as a whole attempt to put in memory all elements of ECAL? attempt to put in memory all elements of ECAL? ! Visualization itself is not friendly yet ! Visualization itself is not friendly yet (nothing new from the last software week) (nothing new from the last software week)

12 Conclusion XML Description of Beam Pipe/v1 is done Not in CVS yet: Some tests should be done XML description of ECAL/v1 is done (tomorrow report at CALO software meeting) Not in CVS yet: GaudiLab problems XML description of new version of Magnet Geometry in progress: GaudiLab Problems (No Visualization) need to be solved as soon as possible