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

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:

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,

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.

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 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

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

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