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The BaBar/PEP-II Liaison Team

[ Responsibilities | People and Shifts | Recent News | Training | References ]

[ Liaison Shift Manual ]

Charge to the Liaisons

There will be one person from this group permanently on shift in the PEP-II control room during the PEP-II run. The role of this person is to serve generally as a liaison between BABAR and PEP-II to increase the overall running efficiency and to minimize the background impact on BABAR. More precisely, they will:

  1. Help PEP-II crew to use BABAR inputs and interpret what's going on in BABAR
  2. Inform BABAR of what is going on in PEP-II
  3. Participate in immediate running decisions (under the authority of BABAR shift leader) with BABAR and PEP-II shift leaders
  4. Collect all the information useful for BABAR in PEP-II control room
  5. Participate in daily BABAR and PEP-II meetings
  6. Analyse off-line babar backgrounds data w.r.t. respect to the machine
  7. Prepare and implement the automatisation of the above tasks, where relevant.

Note that they are not charged with a specific BABAR protection role. BABAR protection should rely on the BABAR protection system and not on human being interventions. However, by having a loving look at BABAR sensors, they will certainly contribute to the overall protection, spotting problems before they become critical. One part of the BaBar protection system that requires regular attention from the liaison is the SVT mid-plane PIN diodes (the "abort" diodes), whose pedestals ("abort thresholds") need to be calibrated at least twice a day.

Administratively, they are to be considered like another BABAR person on shift, similar to those on shift in the BABAR control room. They therefore report during their shift to the BABAR Shift Leader.

The People and Shift Schedule

Since the 2002 summer shutdown, liaison shifters are selected from a group of people who have been working on accelerator backgrounds or on the radiation protection system of some of the subdetectors. Their names are in the following list. If you are interested in this topics and want to join this team please contact Giovanni Calderini. (

Sign up for Liaison shifts can be made using the standard web-based Shift Schedule forms. Liaison shifts are served at the Main Control Center (MCC), Building 005.

You can find the liaison shift manual here. For posterity, we keep the year 1999 liaison shift manual here.

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Training Materials

Visit the Training page for more information.

Weekly (as requested) Liaison Training Seminar

New Liaisons must attend at least one session of the Liaison Training Seminar. This seminar includes a workshop and a hands-on tutorial and is usually on Mondays from 9:00 to 10:30 am in the Cornelius Conference Room at IR-2. Please note that the seminar will be held only if the Liaison Coordinator (currently Stan Hertzbach, receives requests from people who wish to take it.

Training Week One

Training Week One for the Liaisons was 30 March - 1 April 1999. The workshop was held at SLAC, and most of it was videotaped. Some of the materials are collected here for easy reference. The schedule is here, and available materials are hyper-linked.

Useful References

These references and manuals help define the Liaison task and should provide information about radiation backgrounds at IR-2 in general.

Other Documentation

Other accelerator related interesting documentation can be found in:

  • M.Sands, Storage Rings Luminosity, SLAC-TN-69-012.
  • D.A. Edwards, M.J.Syphers, An introduction to the physics of high energy accelerators.

This page was created by T.I. Meyer (
Recently modified by G.Calderini (

Last modified: Wed Sep 18 23:22:14 2002