1 / 3

Status of ECAL integrators

Status of ECAL integrators. Integrator boards. New version (install a 100 nF blocking capacitor in the fast signal line): uses ~90% of the anode current, instead of ~1% sensitivity ~ 100 DCU counts/ μ A DC gain ~2.2 instead of 3000  no stability problems with TL072 ( rad hard).

kaspar
Download Presentation

Status of ECAL integrators

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. Status of ECAL integrators

  2. Integrator boards • New version (install a 100 nF blocking capacitor in the fast signal line): • uses ~90% of the anode current, instead of ~1% • sensitivity ~ 100 DCU counts/μA • DC gain ~2.2 instead of 3000  no stability problems with TL072 (rad hard) I, nA NB requires slight modification of CW bases: install 100 nF in series with 25 Ω. This does not affect the signal. Recently, the integrators were upgraded: the 40 mezzanines were replaced with new ones. The work on production and installation of new integrator boards, including modification of host CW bases, was performed in December 2010 – January 2011 (Irina, Pavel, Anatoly Zh.). The nominal sensitivity is 275 mV/μA (110 counts/μA). Measured at the lab before installation in 20 out of 40 boards (Pavel): ±2% deviation. When installed onto CWs, its sensitivity becomes 100 counts/μA because of the 100kΩ “safety” resistor at the CW base. The anode current in ECAL is measured in 40 PMTs out of 6016, through “integrators”, 1-channel mezzanine boards installed at the back of each of these 40 PMT/CWs (original design by Yu. Gilitsky). Each integrator contains an amplifier for measuring current and pass-through for fast signal and LV/MV. The readout is performed via SPECS DCU of regular CALO DAC/HV motherboards. Part of ECAL HV projects. Yu. Guz

  3. Integrator readout Within the monitoring script of the ECHVA1/ECHVC1 projects, every ~25 sec. PVSS archiving is arranged for all the 40 channels. Trending pages are available (use shortcut G:\online\ecs\Shortcuts38\LHCb\LBECSINFO\LBECSINFO_UI_lbTrending , then CALO  ECAL  IntegratorsA or IntegratorsC). By unknown reason (presumably hardware SPECS problem, to be understood), at the C side the regular readout with SPECS server fails. To cope with this, a software patch is applied: the integrators are read out with a separate executables controlled by ECAL HV projects. The result returned into the PVSS projects is an average over several consecutive measurements (22-23 readings, limited to 1 sec), this is to reduce fluctuations expected at beam. Will return to regular readout when (if) the problem at side C will be understood. To ensure reliability, the information is also stored locally in .txt files. L:\pvss\ECAL_INTdata\data\Ecal_INTdata_A.txt (EcalINTdata_C.txt) on ECHVA01W (ECHVC01W). Yu. Guz

More Related