-------- Original Message --------

Subject: BLM naming and placement

Date: Mon, 04 Sep 2006 12:04:09 +0200

From: Bernd DEHNING <Bernd.Dehning@cern.ch>

Organization: CERN

To: Slava Grishin <Viatcheslav.Grishin@cern.ch>, 

Mikhail Sleptsov <Mikhail.Sleptsov@cern.ch>,  Gianfranco.FERIOLI@cern.ch,

laurette ponce <laurette.ponce@cern.ch>,  Bernd Dehning <Bernd.Dehning@cern.ch>

Hi All,

let me give you a summary of the general rules of the placement and

naming of ionisation chambers and SEMs.

                Cheers Bernd

The general placement is defined in the a file URL:

http://cern.ch/blm/Beam_loss_detectors/Locations/general_role_for_detector_locations_CR_06022006-1.pdf

The naming scheme for the expert name was defined in meeting (Laurette,

Franco and me)

The ionisation chamber or SEM are referenced to the nearby machine

element (most of the time a magnet, but also collimators or other

elements). The counting is done in beam direction that means in

opposite direction for the detectors of beam 1 and beam 2.

observation locations:

1. observation of the losses at the entrance of the element (one

ionisation chamber or one SEM, with the number 1)

2. observation of the losses at the middle of the element (this detector

may consist of several detectors, with the numbers 21, 22, 23, ....)

3. observation of the losses at the exit of the element one ionisation

chamber or one SEM, with the number 3)

Exception: The detector at the location 1 could be missing if the

previous element has and detector observing the exit losses.