GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 1/16 What? Where How? Description of the Geometry What? Where How? Description.

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Presentation transcript:

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 1/16 What? Where How? Description of the Geometry What? Where How? Description of the Geometry Anders W. Borgland SLAC Instrument Analysis Workshop 1 SLAC, June 7, 2004

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 2/16 Two towers From LAT Coordinate System LAT-TD These numbers – 8,9 – correspond to the value in the variable GltTower mm ~400 mm (0,0) Both towers should have positive Y coordinates and negative X coordinates in the ntuples For developers: Towers are in SAS GRID positions (X_xml, Y_xml)=(0,2),(1,2) (cf XML files and README, lower left corner is SAS GRID position (0,0) )

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 3/16 The two towers are really there …. From the event display: This talk: - Where to find useful and relevant geometry information. - - How to use the event displays to access geometry information.

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 4/16 Where and what? Geometry information can be found in XML files in the package xmlGeoDB. Geometry here means: –Geometry i.e. how many, how wide etc. –Material characteristics and composition. –Configuration i.e. detector thresholds like cal.zeroSupressEnergy Tkr.trigThreshold SAS and subsystems are currently working on verifying and updating these numbers: –LAT-TD

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 5/16 Where to find geometry information? Release: EngineeringModel with cvs tag v2r0402p4 Two towers specific information (actual position of the two towers etc): –xmlGeoDB/xml/latAssembly/2TowerSection.xml ‘Everything’ else: –xmlGeoDB/xml/latAssembly/2TowerSegVols.xml –Dimension of CAL diodes are still the same, so …. The file just contains softlinks to xmlGeoDB/xml/flight/*.xml Material characteristics and composition: –xmlGeoDB/xml/materials.xml

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 6/16 The Event Displays Looking at xml files can be fun, but ….. We can also use event displays – both the GLAST Event Display and FRED – to access and look at geometry information. Examples in this talk: –The CAL diodes –The tracker Multi-Chip Modules –Overall dimensions

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 7/16 The GLAST Event Display

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 8/16 The CAL diodes

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 9/16 The CAL diodes cont’ xmlGeoDB/xml/flight/CALDimPrim.xml

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 10/16 Tracker Multi-Chip Module (MCM) xmlGeoDB/xml/flight/TKRDimPrim.xml

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 11/16 Tower dimensions X-Z (in mm) X Z Approximate dimensions from the event display using set points:

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 12/16 Zoom Use set points after zooming in!

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 13/16 (Approximate) Tower dimensions Z-Y (in mm) Z Y These numbers are only approximations found by using set points in the GUI. For the correct/precise dimensions, look in the xml files, in the new and updated document LAT-TD or …..

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 14/16 FRED FRED is a new event display – see Riccardo’s talk later today! Can load a 225kB xml file (made by a separate application) with all the geometry for the two towers. Can look at offline and independently of Gleam and GlastRelease. Easy to access geometry the information: –Click on the element (like the CAL diode) in the HepRep instance tree. –Dimensions, composition etc come up automatically i.e. no need for ‘reference’ points (and zooming) like with the old GUI. –Element is colour highlighted in the event display.

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 15/16 FRED XML info here! diodeL

GLAST LAT Project Instrument Analysis Workshop June 7, 2004 Anders W. Borgland 16/16 Conclusion SAS and the subsystems are currently verifying and updating the geometry information: LAT-TD Digging in xml files to get to the geometry is fun, but …. looking at event displays is sometimes a good alternative. Checking out FRED may be worth while