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IONS for LHC: LEIR and PS

This presentation discusses the operational performance of Lead ions in the Large Hadron Collider (LHC), focusing on the LEIR (Low Energy Ion Ring) and PS (Proton Synchrotron). Key points include achieving 7.10^7 Lead ions per bunch and a 30% overall transfer efficiency from LEIR to LHC. The document outlines parameters such as emittance requirements, extraction methods, and cooling processes to meet operational deadlines for 2008. It also addresses challenges in space charge limits and the need for better cooling and efficiency improvements within the available ion cycles.

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IONS for LHC: LEIR and PS

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  1. IONS for LHC: LEIR and PS Presented by M. CHANEL June 28th 2002 –LHC Ions Workshop

  2. GENERAL SCHEME LHC.LEAD.new.PUB

  3. Nominal Performance for LEAD ions • 7 107 Lead ions/bunch in LHC at 2.7 TeV/n in a normalised emittance of 1.5 mm(bg s2/bh,v). • Overall transfer efficiency(from Leir extraction lo LHC coast) of 30%, • e*<1.2 mm at the exit of SPS, • e*<1 mm at the entrance of SPS after final stripping, • e*<0.7 mm at the entrance of PS. • A total of 0.9 109 ions extracted from LEIR • Limit as much as possible LHC filling time.

  4. extraction triplet doublet HVP injection D=10m Electron cooling D=0m

  5. LEIR cycle for LEAD ions Multiturn injection H+V+P planes 50 efficient turns 3.0 108 ions per injection Extraction at Br=4.8 Tm, 2 bunches total 9108 ions en=0.7mm Ecooling max 400 ms reduce en from 2 to 0.5 mm, d from 10-3 to <0.2 10-3 Density increase by 80 Acceleration, IBS Dynamic Vacuum very good (10-12 range) Cycle 3.6 s 4 injections in 1.6s End cooling, bunching, space charge limit DQ<0.3

  6. LEAD IN THE PS Fast extraction Br=86.7Tm RF h=21 to h=169 (80MHz) Splitting RF h=169 to h=423 4 pairs of bunchlets 100ns dist. 2 bunches b. to b. injection RF h=16 space charge limit DQ<0.25 Intermediate front porch Br=22 Tm RF h=16 to h=14 to h=12 Splitting h=24 then h=21 4 bunches

  7. Injection h=16 h=16 to 14 Front PORCH h=14 to 12 Splitting h=12 to 24 h=24 to 21 to 169 FLAT TOP Splitting h~423 (200MHz)

  8. TT2(from PS to SPS, has to be changed) • At stripper bh,v~20m5m, D~-1m • Blow-up reduced by a factor 4 compared to old(normal)optic….needs MD for SPS matching. De~0.2mm after re-matching in SPS?. • Need of 4 quads, 6 power supplies +building.(mostly recuperated)

  9. Other ions • Ions should have the highest possible charge state already in LEIR: • Remove SPS limit • Better and faster cooling in LEIR(Z2/A) • Limits are in LEIR and PS (space charge) • PS RF not studied See Daniel’s talk

  10. Year 2002 2003 2004 2005 2006 TOTAL PIL & LEIR TOTAL 2150 6050 6380 4289 610 19479 LEIR + PIL Cost

  11. Schedule

  12. Conclusions • LEIR and PS well adapted for all ions. • Flexible in terms of Nions/bunch. • Can be operational for 2008 • More in http://chanel.home.cern.ch/chanel/Welcome.htm

  13. Stacking tests of lead ions requested Source+efficiency Losses+charge state With the lattice used, it was not possible to accelerate the beam

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