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IONS for LHC: LEIR and PS

IONS for LHC: LEIR and PS. Presented by M. CHANEL. June 28 th 2002 –LHC Ions Workshop. GENERAL SCHEME. LHC.LEAD.new.PUB. Nominal Performance for LEAD ions. 7 10 7 Lead ions/bunch in LHC at 2.7 TeV/n in a normalised emittance of 1.5 m m( bg s 2 / b h , v ).

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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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