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AOB from the expts

AOB from the expts. details… 150 ns filling scheme evolution HI2010 filling scheme LHCb dipole. Little reminder. Transverse scans, as well as VDM scans, can and normally should be done in STABLE BEAMS. 150ns with more and more bunches. getting tough… Thanks!!

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AOB from the expts

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  1. AOB from the expts details… 150 ns filling scheme evolution HI2010 filling scheme LHCb dipole

  2. Little reminder Transverse scans, as well as VDM scans, can and normally should be done in STABLE BEAMS.

  3. 150ns with more and more bunches • getting tough… Thanks!! • 225ns spacing would help a bit • for 150ns (and possibly 50ns) would allow quasi-doubling the nr of collisions in IP2 without any cost for the other experiments • 32bpi becomes mandatory for 350 bunches • for future upgrade of “SPS injection request manager”: • allow more flexible description of requested SPS batch ? • more dynamical • example: allow batches with different gaps in same filling • inject once 8b+300ns+8b+300ns+8b, then 8b+225ns+8b+375ns+8b • also upgrade booster transfers ? • For example, allow starting with 1b from PSB=>PS, and then 6b for the subsequent transfers. => dynamic request of nr of PSB bunches • in SPS at 150ns this would be: 2b train, then 12b trains • would allow minimizing footprint of first LHC injection (<setup beam limit) • AGK: from now will use buckets <31182

  4. Changing the RF bucket 1 position for ions • Currently, abort gaps meet in IP1 (and IP5) • Proposal made (Jowett & Carli): move HI abort gap encounter to IP2 such as to allow max nr of collisions in ALICE • What impact on expts ? => it is not transparent. Affects trigger/timing of detectors. Probably can be handled in the shadow of the first few days of HI beam cmg, but difficult to be sure… Please, wait a week before deciding. NB: ALICE wants to have anyway at least 1 non-colliding bunch • In current scheme, this is “automatic” since some bunches meet the abort gap in IP2. • ATLAS/CMS want some non-colliding bunches: remove a few of those which do not collide anyway in IP2. Very minimal cost in luminosity

  5. Ion scheme, no change of abort gap crossing point RF bucket bunch space (ns) nr of bunches per PS train space in SPS (ns) PS trains per SPS batch population (1e9p) Injection sequence: inj 1 1 ring_1 1 500 4 2000 1 100 inj 2 1 ring_2 1 500 4 2000 1 100 inj 3 2 ring_1 1601 500 4 2000 1 100 inj 4 2 ring_2 1601 500 4 2000 1 100 inj 5 3 ring_1 2601 500 4 2000 4 100 inj 6 3 ring_2 2601 500 4 2000 4 100 inj 7 4 ring_1 6001 500 4 2000 3 100 inj 8 4 ring_2 6001 500 4 2000 2 100 inj 9 5 ring_1 8911 500 4 2000 1 100 inj 10 5 ring_2 8911 500 4 2000 1 100 inj 11 6 ring_1 10511 500 4 2000 1 100 inj 12 6 ring_2 10511 500 4 2000 1 100 inj 13 7 ring_1 11511 500 4 2000 4 100 inj 14 7 ring_2 11511 500 4 2000 4 100 inj 15 8 ring_1 14911 500 4 2000 3 100 inj 16 8 ring_2 14911 500 4 2000 3 100 inj 17 9 ring_1 17821 500 4 2000 1 100 inj 18 9 ring_2 17821 500 4 2000 1 100 inj 19 10 ring_1 19421 500 4 2000 1 100 inj 20 10 ring_2 19421 500 4 2000 1 100 inj 21 11 ring_1 20421 500 4 2000 4 100 inj 22 11 ring_2 20421 500 4 2000 4 100 inj 23 12 ring_1 23821 500 4 2000 2 100 inj 24 12 ring_2 23821 500 4 2000 3 100 inj 25 13 ring_1 26731 500 4 2000 1 100 inj 26 13 ring_2 26731 500 4 2000 1 100 inj 27 14 ring_1 28331 500 4 2000 1 100 inj 28 14 ring_2 28331 500 4 2000 1 100 inj 29 15 ring_1 29331 500 4 2000 4 100 inj 30 15 ring_2 29331 500 4 2000 4 100 Tot number of beam 1 bunches (all types) : 128 Tot number of beam 2 bunches (all types) : 128 collisions at IP1&5 = 124 beam1-empty at IP1&5 = 4 beam2-empty at IP1&5 = 4 empty-empty at IP1&5 = 3432 collisions at IP2 = 120 beam1-empty at IP2 = 8 beam2-empty at IP2 = 8 empty-empty at IP2 = 3428 collisions at IP8 = 0 beam1-empty at IP8 = 128 beam2-empty at IP8 = 128 empty-empty at IP8 = 3308 not optimized and maybe not even possible…

  6. “500ns_128b_124_120_0_4x4bpi15inj”

  7. LHCb dipole vs ion run • LHCb will not operate during the ion run • Can the dipole spectrometer be turned off ? If not: • 100 kCHF for the whole run (4kCHF/day) • 4MW on the power budget (any critical days in November?)

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