+-- Collider Front end- Balbekov version Test +-- Collider Front end- Balbekov version David Neuffer Fermilab

Outline +-- Collider Single bunch Collection and cooling Scenario Critical components +, - Capture Capture large phase space  - Cooling Cooling of large phase space, 6-D cooling By large amounts

References NuFACT03 talk Accelerator Advisory Committee talk (November 2003) Mucool 245, 272, 276, 277 notes PAC 1999 (Li lens Channel)

Summary

First +-- Collider cooling scenario -Balbekov Complete simulation obtains ~0.05 /p PD-proton source  TS Target Station  PR phase rotation (36MHz) 40m, single bunch BC –Bunch Compressor 36MHz ring cooler (1.75T), ,rms: 17  7mm, L,rms: 300 30mm  RF- RFOFO Ring Cooler 200MHz ring cooler (~3.5T) ,rms: 7  2.5 mm, L,rms: 30  3mm  LL – Lithium lens cooler  10 T ,rms: 2.5  0.5mm

Collider Cooling Scenario Nearest to “complete” cooling scenario for +-- Collider … Balbekov 2003

Producing and Capturing  Collaboration baseline: 16-30GeV p-beam on Target (Hg-C) immersed in 201.25 T solenoid, taking ~250 MeV/c  ? … Rf: 36.37 MHz, 6.37 MV/m Capture in 1 bunch

RFOFO ring cooler performance Transverse before and after Cools longitudinally more than transversely Longitudinal cooling not fully used in scenario E-ct before and after

Compare 2003 and 1999 Li coolers 2003 – short cells, “small” phase advance/cell 200MHz rf, 15MV/m 10T, r= 1.2cm L=0.13m β* = 4.25cm Cools transversely to ~5mm Large longitudinal dilution 2.6m cells, 90m channel 1999 – Long cells - 180º longitudinal phase advance/cell 800MHz, 30MV/m rf Up to 20T, 0.8cm lenses, 1.8m long Cools transversely to ~2.5mm Smaller longitudinal emittance and dilution 50m long -- 5 cells

Balbekov 1999 Li lens cooler

Final Li lens Cooler ??? Need to cool T from ~0.5mm to ~0.1mm Stronger focusing Li lens ?? 10T  20 T Smaller aperture Stronger longitudinal Focusing 30MV/m , 805MHz Problems Chromatic effects Matching

Critical R&D needed Push low-frequency gradients 6MV/m  ?? (~30 MHz) 12MV/m  ?? (~200 MHz) Injection/Extraction Kickers Improve optics (acceptance, …) Li lens technology Maximal field 20T+ Gradient 1cm or less Length ?? lifetime (110  60Hz ??)