Sector Test Meeting 29th November 2005

Present:  Verena Kain, Brennan Goddard, Roger Bailey, Mike Lamont (chair), Jan Uythoven, Stephen Jackson, Greg Kruk, Nicholas Hoibien, Rhodri Jones, Alex Koschik, Lars Jensen, Jorg Wenninger.

Issues arising:

• Status of BIC during test - to be confirmed
• Mobile BLMs - Alex to check with Bernd - done - BD's reply regarding the scenario for the movable detectors. : "High voltage supply for the additional chambers: we will use the high voltage distribution network. On average we have 20 m a plug. If we prefer, we can use a local power supply"

Beam Position Monitors

Rhodri Jones presented the anticipated state of play for the configuration and installation of the BPMs in 78 and 81.   His presentation here.

• Hardware commissioning should start in May 2006. WorldFIP required.
• ~2 e10 protons/bunch for nominal noise performance.
• Auto-triggered FIFO mode - no timing in required - registers whatever passes after a given external trigger [BST]. No bunch-to-bunch tagging in this mode.

Rhodri raised following questions re.Control System Architecture
– Do we extend the TI8 system or base it on a prototype LHC system?  Clear consensus that we should prototype LHC system. Should take advantage of beam to test maximum functionality.
– Data from Survey & MTF databases need to be available for offset & linearity correction. Survey data to LSA database. BDI can take care of the rest.
– SPS BST used for timing & trigger. Will LHC BST be available? Follow-up.

– What is Logged?
• Average position -yes
• Bunch to bunch position - yes

Lars Jensen presented the controls and acquisition strategy. His presentation here.

• Hardware acquires individual LHC bunches (@ 40 MHz)
• LHC system is exact copy of BPMI (TI8) trajectory system in terms of hardware
• We can provide calibrated position data:
– Bunch-by-Bunch (B selected bunches over T selected turns)
– Turn-by-turn (average of all valid bunches in 1 turn)
– Closed-orbit (average of all valid bunches over N turns)
• Hardware works in one of two acquisition modes:
– Synchronous (needs BST timing and correct phases)
– Asynchronous (safer, but 40MHz information lost)
• Sensitivity switch in the tunnel controlled over WorldFIP to handle big intensity variations (high for pilots, low for I > ??). This via PCs not using FESA.
• BPM sum signal or not and how to handle ??  Intensity cards probably not ready for sector test - possible to put a few cards in at selected position.

BPM timing events:
• We will need these LHC timing events:
– Fore-warning before FIRST LHC injection takes place
• Setup hardware modules (phases) etc
– Short warning to arm acquisition modules before each LHC injection. We can publish the data for each injection based on this event

Noted during discussion.

• All properties should be published through CMW - whether or not they are being pushed through RT channel.
• Need to finalise property data content and structure.
• Availability of high level access to test implementation would be useful.
• Need to establish what LHC timing needs to, and/or will provide for the test, in the long run.

Next meeting 7th December to discuss installation and hardware commissioning.

ML 6/11/05