1 / 15

SMT pedestal management

SMT pedestal management. Weekly NIKHEF – NIJMEGEN – D0 meeting June 6, 2001 Freya Blekman Summary: Outline of current SMT status What is the next step? SDAQ vs. PDAQ Yet again: Databases The smt_ped_tools Some results. SMT status (current). 100% of the SMT is now cabled

latona
Download Presentation

SMT pedestal management

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SMT pedestal management Weekly NIKHEF – NIJMEGEN – D0 meeting June 6, 2001 Freya Blekman Summary: • Outline of current SMT status • What is the next step? • SDAQ vs. PDAQ • Yet again: Databases • The smt_ped_tools • Some results Freya Blekman, NIKHEF Amsterdam

  2. SMT status (current) • 100% of the SMT is now cabled • 95 % of the barrels has been read out • For the F-disks and H-disks, this is a bit lower (around 90%) • Still some HV problems, nothing major. • Still only running in full-readout mode. Freya Blekman, NIKHEF Amsterdam

  3. What is the next step? • We can now only run whilst reading out all (=800,000) channels of the SMT. • This load is not possible for the DAQ (nor will it ever be) • SMT will eventually be running in sparse mode ‘sparse’ = with pedestal subtraction on the svx readout chip (~= ADC) and zero-surpression. Freya Blekman, NIKHEF Amsterdam

  4. What to do: get those Pedestals! • Every channel has its own ADC. • The pedestal values have only been measured in lab, and even there not very well. • When downloading the chip, the pedestals can be set. • Pedestal values are retrieved (per channel) in the calibration database and in the online (=‘hardware’) database Freya Blekman, NIKHEF Amsterdam

  5. Pedestal measurement • At D0, there are two ways to measure the pedestal values of the silicon 1. Take data and look at the average data per channel (= Primary Data Acquisition) 2. When not running, put charge on every channel and do a raw pedestal measurement. (=Secondary Data Acquisition) Freya Blekman, NIKHEF Amsterdam

  6. SDAQ vs. PDAQ (1) PDAQ + : Use the data you already have to compensate. ‘Standard’ way to do it. PDAQ - : You need data ! (and lots of it) PDAQ - : Cannot readout full SMT unless sparse mode: will only be reading out channel with hit and two neighbors. Freya Blekman, NIKHEF Amsterdam

  7. PDAQ vs. SDAQ (2) SDAQ + : It’s relatively quick.(few hours) SDAQ - : It’s not clear that charge deposition on Si strips has the same result as real life. SDAQ - : Remove SMT from global run. SDAQ - : Program still very unreliable (for instance, it ignores the 9th chip on 9-chip ladders. 50% of the SMT barrel detectors are 9-chip ladders.) Freya Blekman, NIKHEF Amsterdam

  8. Last few weeks: • Several SDAQ runs (unbiased ladders) • Database problems (solved now) • smt_ped_tools (in cvs) • ROOT-based gui • Create_ntuple program • SMT_pedestals.root • Some small macros Freya Blekman, NIKHEF Amsterdam

  9. create_ntuple.x • CPP code • Uses 2 packages: • D0omORACLE Connects to ORACLE calibration DB • HepTuple Creates root files • Creates root ntuple Freya Blekman, NIKHEF Amsterdam

  10. create_ntuple.x (2) • Why not directly in root? • Too much trouble with TSQL classes in root. • TSQL works (after a lot of work) on linux, when you have administrator privileges. • One of the CDF ORACLE gurus recently (last month) got it working at fnal. • I decided that it wasn’t worth wile trying, you don’t want to connect to the database every time anyway. Freya Blekman, NIKHEF Amsterdam

  11. Smt_ped_gui.C • Uses ROOT • ROOT has gui classes • Is essentially a big root Macro • Plots averages as a function of run number. • Options for HDI type selection Freya Blekman, NIKHEF Amsterdam

  12. Smt_ped_gui/rootMacros/ • Ready: • Channel maps (semi-interactive) • Near future: • Pedestals as a function of integrated luminosity is dependent of availability of • My time • Luminosity data (Mike Begel) Freya Blekman, NIKHEF Amsterdam

  13. Results (1) Direct output of smt_ped_tools/ smt_ped_gui.C Freya Blekman, NIKHEF Amsterdam

  14. Results (2) • Run 121545 • Ladder type • Barrel 4 • Layer 2 • Ladder3 • Double-sided, 6 svx chips • one of the detectors closest to (0,0,0) Freya Blekman, NIKHEF Amsterdam

  15. Results (3) • Run 121545 • Ladder type • Barrel 4 • Layer 3 • Ladder3 • Double-sided, 9 svx chips • SDAQ 9th chip problem visible Freya Blekman, NIKHEF Amsterdam

More Related