VELO Status u u u VELO Milestones Test
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VELO Status u u u VELO Milestones Test Beam Answer to Question of Referees
u 4/2000 Design of Mechanics 8/2000 LHCb design ready 1998: 1998 -1999: 1999 -2000: 2000 -2001: (Mechanics, Vacuum, Cooling, RF shield) first design for TP finite element analysis for tank and central frame cooling with CO 2, design and tests re-design of RF shield re-design of motion mechanics (new requirement to have intermediate steps) construction of prototypes for vacuum and RF tests u To be negotiated with LHC machine: Differential pressure: RF shield with 250 m Al = 15 mbar or 1 mm Be = 500 mbar Vacuum instabilities: do we need Ti-coating, out-baking ? u Next meeting with LHC-VAC: 28 November Cooling with C 02 under high pressure u Risk analysis Measurements of ion desorption yields by LHC-VAC, Dec’ 00
u 6/2000 Design of Silicon Detector 2/2001 1998: 1999 -2000: ( ) First design, n-on-n, 60 o wedges, 300 m, rf geometry, used in testbeam Second design, p-on-n, 180 o modules, 150, 200, 300 m reduced inner and outer radius first detectors delivered summer ‘ 00, one detector (200 m) irradiated and readout in testbeam 1999 -2000: Optimization of detector geometry, material distribution Results: l Toblerone RF shield with 250 m is OK l inner radius of 8 mm reduces multiple scattering error l outer radius 45 mm 25 stations l 45 o sectors compared to 30 o OK for trigger Oct’ 2000: Third design, n-on-n, 180 o modules, 200 m Feb’ 2001: Improved design of phi detector, stereo angle, strip pitch Jan’ 2001 Decision about technology, driven by radiation hardness, smallest strip pitch
u 7/2000 Submission of final radhard FE chip 11/2000 u ( ) BEETLE 1. 0 First submission: June 2000, back: September 2000 n n n Layout error prohibits programming of chips Patch applied on one chip using a focused ion beam Patch worked, chip can be programmed Testing of chip showed no error so far Measurements of analog response expected this week next submission (final chip): January 2001 u SCTA_VELO (final chip) : Nov’ 2000 n n Review of design on 8 Nov. triggered one modification Now ready for submission together with CMS-Preshower
u 4/2001 TDR submission 5/2001 To match with LHCC on 4 -5 July: u u u 6 April first draft to VELO 20 April draft to LHCb-TB 28 May TDR submission to LHCC
Other News MICRON detectors finally received One phi detector (200 m thin, oxygenated) had been irradiated and put into beam Irradiated HAMAMATSU detector Low irradiated side 4. 2 1014 p/cm 2 Low irradiated side 9. 8 1014 p/cm 2
Improved Test Beam Setup Black Box Scintillator Old Telescope Cool Box Black Box Testing detector Forward Station Fast station Scintillator u u New mechanics for positioning the test detectors Additional detector with 25 ns integration for accurate timing