RHIC Electron Cooling Group

Collaboration Workshop on RHIC cooling and high-brightness electron beams, May 24-26, 2006, Brookhaven National Laboratory




Wednesday morning, May 24, 2006

Time Plenary: Building 911B Large Conference Room
09:00-10:30 Opening plenary

 Session Chair: Thomas Roser

10:40-11:10 Coffee break
11:00-12:00 Plenary session

 Session Chair: Thomas Roser

12:00-1:30 Lunch break

Plenary session details:

9:00 Welcome: Derek Lowenstein

9:10 Overview of e-cooling project (RHIC-II) and purpose of the workshop: I. Ben-Zvi (30 min)

9:40 Electron beam transport and performance in ERL for RHIC electron cooling: D. Kayran (30 min)

10:10 Electron cooling of RHIC: A. Fedotov (30 min)

10:40 coffee break

11:00 RHIC lattice for cooling: S. Tepikian (30 min)

11:30 Performance of the FNAL electron cooler: S. Nagaitsev (30 min)



Wednesday afternoon, May 24, 2006

Time Cooling Group 1005 4th floor conf. room Photoinjector Group, 1005 3rd floor conf. rooms
3:00-3:30 Coffee break

Cooling Working Group details

Organization: WG leaders

D. Bruhwiler: Description of the friction force and degree of uncertainty with and without wigglers,

A. Shemyakin: Comparison between theory and experimental measurements of the FNAL cooler.

Discussion: What additional experimental measurements are needed? What additional simulation studies are needed?

A. Sidorin: How good is our understanding of luminosity prediction based on non-Gaussian distribution and recombination?

I. Kaganovich: Theory of recombination and experimental results.

Discussion: What improvements in our models are needed? Do we need wiggler to suppress recombination?

Photoinjector Working Group details

Organization: WG leaders

Triveni Rao: The photocathode scenario and laser requirements

Hiromitsu Tomizawa: Laser pulse shaping experiments

Yuelin Li: Schemes of arbitrary laser pulse shaping


Expected laser performance in power, stability (amplitude and phase). What can be done and what may become available in laser pulse shaping



Thursday morning, May 25, 2006

Time Cooling Group, 1005 4th floor conf. room Photoinjector Group, 1005 3rd floor conf. rooms
10:30-11:00                                                              Coffee break
12:00-1:30                                                               Lunch break

Cooling Working Group details

A. Jain: Helical undulator design.

Discussion: 1. What are requirements on wiggler parameters? 2. What are requirements on wiggler errors? 3. Do we need additional focusing in cooling section?

G. Bell: Friction force with errors

P. Cameron: Diagnostic and beam alignment.

Discussion:  What are requirements on beam alignment and diagnostic accuracy?  What instrumentation will be needed?

Photoinjector Working Group details

Mike Cole: The cell superconducting gun design and status

Ram Calaga: HOM, multipactoring and coupling in the cell gun

Jacek Sekutowicz: What field performance can we expect from the gun.


What are the open problems to realizing SRF guns of high-current? What performance can we expect from the gun?




Thursday afternoon, May 25, 2006

Time Cooling Group, 1005 4th floor conf. room Photoinjector Group, 1005 3rd floor conf. rooms
3:00-3:30                                                               Coffee break
7:00                                   No-host dinner, RSVP on Wednesday

Cooling Working Group details

V. Reva: Stability issues in electron coolers

A. Burov: Stability issues at the FNAL cooler

G. Wang: Stability thresholds

Discussion:  1. How accurate are our estimates of stability thresholds? 2. What else need to be done? 3. Develop R&D plan.

Other items:

1. Discussions of various effects within electron beam (relaxation, CSR, etc.) and effects on electron beam due to interaction with ions beam.

2. Can we use one ERL for two RHIC rings?

3. Other topics which come up during the meeting.

Photoinjector Working Group details

James Rosenzweig: Emittance compensation theory, simulation and experiment

Xiangyun Chang: Performance of the electron cooler gun

Jorg Kewisch: Optimization of gun parameters

Sergey Kurennoy: The reliability and accuracy of PARMELA for RF guns

Dimitre Dimitrov: Initial 3D Electromagnetic RF Gun Simulations with VORPAL


Gun-solenoid-linac spacing: Is there an optimal distance? Chromatic compensation.

Solenoid edge effects. Reliability of codes. ERL merger issues.

Develop R&D plan.



Friday morning, May 26, 2006

Time Cooling Group, 1005 4th floor conf. room Photoinjector Group, 1005 3rd floor conf. rooms
09:00-10:00 Final discussion of Summaries Final discussion of Summaries
Change location 911B Large Conference Room
10:00-10:30 Coffee break
10:30-12:00 Plenary Session: Working Group Summaries

Session Chair: Wolfram Fischer

Summary of the electron cooling working group

Summary of the photoinjector working group






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Last Modified: January 31, 2008

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