1. ECOOL Meeting 03/26/10 1 Low-E cooler baseline decisions: 1.FNAL’s cooling section “as is” – with weak solenoids, correctors, etc. (to prevent over focusing from ion beam). 2. Cooling section beam pipe size – compatible with existing solenoids and RHIC aperture limitations: 3” OD (S. Tepikian showed that one can get acceptable RHIC optics). 3. BPM’s design for 3” OD pipe (2.87”ID) – to be done based, on FNAL’s design of 2” BPM’s 4. Electron beam transport in/from cooling section - under one ion beam line with an angle towards other ion beam line. 5. Blockhouse/Pelletron location @ IR4 - inside cryo-lines. http://www.bnl.gov/cad/ecooling/LowEnergyEcooling.asp For detailed presentations on these topics see:

2. ECOOL Meeting 03/26/10 2 Low-E cooler @IR4: Q3 Electron beam is tilted at an angle – this removes two 90 deg. bends. Now, in addition to FNAL bends, we have: - four 90 degree bends – to be designed! - one 180 degree bend (of most importance!!!) Available from FNAL

3. ECOOL Meeting 03/26/10 3 Aggressive schedule is required to meet final timeline Preliminary cost estimate of the project – November 2009 (done) Estimate of C-AD manpower November 2009 (done) Physics design complete December 2010 Architectural design & layout July 2010?-June 2011 Electrical design & layout – November 2010-November 2011 Mechanical design & layout – November 2010-November 2011 Site preparation – February 2011- March 2012 (14 month) Recycler’s cooler disassembly and transport October 2011-February 2012 (5 month) Electron cooler installation March 2012 –January 2013 (10 month) Commissioning February 2013 -July 2013 (6 month)+ GOAL: Available for FY14 RHIC physics run (starts November 2013). -2014 run: should expect luminosity optimization (partial improvement) -starting 2015 – expect full luminosity improvement

4. ECOOL Meeting 03/26/10 4

5. 5 Most C-AD manpower will be needed in FY12 & FY13

6. ECOOL Meeting 03/26/10 6 Near-term milestones June 2010: 1.Accurate hardware cost estimate and manpower from controls ! 2.Accurate hardware cost estimate and manpower from instrumentation ! 3.Results from first Low-E Physics run 4.Results from beam dynamics limits at Low-E RHIC June-July 2010: 1.Updated luminosity projection with cooling (better than estimated previously!) 2.Updated cost of the project 3.Review of the above and decisions 4.End of summer: definite plans from FNAL? 5.Start of Architectural, Mechanical, Electrical design can be probably delayed until about July 2010? without overall impact on project end date. Fall of 2010 – start of AIP project? Delay of start of full scale AIP project beyond January 2011 will result in a delay of luminosity improvement with cooling beyond 2014-2015 which may be not consistent with timeline of Low-E RHIC program. NICA program (>2015, physics in 2016?), etc.

7. ECOOL Meeting 03/26/10 7 Some “near-term” tasks 1.Transport of electron beam at lower energies; design of bending magnets; evaluating needed control of field quality (X. Chang, J. Kewisch) 2.Design of turn around (U-turn) of electron beam between cooling sections. Checking preservation of electron beam quality with additional bends, lowest energy (X. Chang, D. Kayran, J. Brodowski) 3.Electron cooler optics. Electron beam (X. Chang, J. Kewisch) 4.Ion beam optics for cooling section (S. Tepikian) – done (preliminary) 5.Careful consideration of “angular budget” in the cooling section from various effects in full energy range of interest (A. Fedotov) – to be presented 6.Interaction of electron and ion beams. 7.Undulators “to be or not to be?” (A. Fedotov) - done, to be presented 8.Updated luminosity projections with cooling (A. Fedotov) – done, to be presented 9.Cooling section and diagnostics (D. Gassner)