Minutes of the 16th Timing Working Group Meeting

Minutes of the 16^th Timing Working Group Meeting (TimWG)
Held on Friday the 1^st December 2000

Present:

Gary BEETHAM, Etienne CARLIER, Philippe BAUDRENGHIEN, Michel JONKER, Robin LAUCKNER, Julian LEWIS, John PETT, Adriaan RIJLLART, Jean-Jacques SAVIOZ.

Agenda

Progress on RF timing requirements, Philippe BAUDRENGHIEN
SLTC presentation, Gary BEETHAM
AOB

Approval of previous minutes

Philippe BAUDRENGHIEN reminded that for the RF the LHC is considered as two independent rings. As two independent RF frequencies will exist (one for each ring), he raised up the question if two independent transmission (i.e. distribution) systems must exit in order to distribute simultaneously both frequencies. He asked SL/BI to clarify his requirements regarding the distribution of the revolution frequencies. He reminded also the necessicity to clarify the source of the 1pps signal. This signal can be obtained either directly from the GPS system or from the PS 10MHz frequency.

Progress on RF timing requirements

Philippe BAUDRENGHIEN reviewed the different timing requirements for the RF system (see slide attached) He identified the different timing information required by the different RF system (200MHz, 400MHz, transverse damper and RF low level ) for the different RF operation mode:

Preparation of the RF before filling,
Filling (first injection in a given ring),
Filling (all injection),
Ring filled, before ramping,
Ramping,
Emittance blow-up,
Bunch length reduction,
Re-phasing,
Collision point adjustment, reduction noise sources,
Physics.

He reminded that the operation of the LHC RF system during the filling will be tightly linked with the SPS RF system and will be seen as a cyclic operation mode. For this reason, he explained that a timing system based on absolute time appears to be incompatible with operation of the LHC RF system.He expressed the necessity, for the RF system, to obtain through the timing system information on the ring to be filled, on the injection number, on the injection bucket number...

Presentation to SL/TC

Gary BEETHAM presented the report that he will done to the PLC committee on the working group work progress. (see slide attached)

Next meeting

Next Meeting will be held on Friday 20th April 2001 at 09:30 in 864 1C01.

Agenda

1. New BI requirements.
2. Location of TTC transmitters.
3. UTC saga.
4. AOB.