Babar logo
HEPIC E,S & H Databases PDG HEP preprints
Organization Detector Computing Physics Documentation
Personnel Glossary Sitemap Search Hypernews
Unwrap page!
Det. Search
Who's who?
Intern. region
Vertex Tracker
Drift chamber
Run Coordination
Contact Experts
Shift Takers Info
Operations Manual
Electronic Logbook
Ops Hypernews
Shift Signup
Check this page for HTML 4.01 Transitional compliance with the
W3C Validator
(More checks...)

Hardware Operation Questionnaire

The questionnaire below refers to potential problems in subdetector hardware and front-end electronics in presence of a high background. Two aspects are studied : a steady background and the presence of spikes. The question of permanent

detector damage and detector protection will be treated in another questionnaire.

ALL subdetectors must fill this questionnaire for the January workshop with a written memo (or a Web page). An interim report will be presented on theDecember 11 Video/phone meeting.

The answers to the first two set of questions must include:

  • A) The noise level at which one particular problem may occur (state it in absolute units: so many Mhz, MeV/sec,etc.. and not x10 background),

    B) The consequences of the problem,

    C) Its recovery time,

    D)The work around plans, if any

    E) Further studies needed

  • If the work-around plan includes turning the detector off at some time, please list

    the consequences in terms of loss of monitoring or protecting signals.

    A monitoring signal is the signal that is meant to be sent to MCC (either under the form of a voltage or an EPICS channel). Its function is to be sensitive to the background in the same way as your detector is.

    A protecting signal is a signal sent to MCC to dump the beam or limit its rate because of potential damage to your detector.

    1. Operation under a steady high background

  • 1.1 detector response and operation

  • Current draw limit from the power supply

    Loss of gain

    Loss of linearity

    Increased dead time

    Increased cross-talk

    Space charge effect


    1.2 Front End Electronics response

    Increased cross talk

    Loss of linearity

    Increased dead time

    Occupancy limit in Front end buffer

    Read out errors

    Overheating, overpower

    Other type of problems


    2. Operation in presence of spikes

    2.1 Detector hardware


    Local damage

    Dead time

    Dataflow hang up

    2.2 Electronics

    Local damage

    Dead time

    Dataflow hang up

    3. Monitoring signals

    3.1 Do you plan to send an analogue signal to MCC

    3.2 What needs to be on (hardware, Front end, DAQ,..)

    3.3 Will this signal be affected by high background

    3.4 do you expect a linear behaviour wrt to input rate

    3.5 Is it simulated yet?

    3.6 how does it correlate with your detector efficiency? With your detector performances?

    3.7 does the operation of this monitoring signal conflict with the protection of your hardware?

    3.8 If you have no monitoring signals and plan to have one, give plans and schedule