Invitation and Call for Proposals, November 4, 2003.

 Dear Colleague,

 This is a reminder that the call for proposals (due Dec. 15) and an invitation to participate in the next Accelerator Test Facility (ATF) Users' Meeting at Brookhaven National Laboratory is scheduled for January 8-9, 2003. The ATF is a users' facility for accelerator and beam physicists. Its users come from the USA and abroad, from universities, industry and national laboratories. The ATF has proven to be an excellent place to train students in the physics of beams. Experiments at the ATF cover a variety of subjects, such as laser acceleration, generation of coherent radiation, and advanced accelerator instrumentation. The use of the ATF electron beam, lasers and diagnostic tools is free of charge for users. The ATF stuff is committed to provide an expertise and assistance in designing and implementing user's experiments. Proposals to carry out experiments are evaluated in a peer review process by the ATF Program Advisory Committee. The ATF Program Advisory Committee (APAC) will meet during the Users' Meeting. The ATF experimental program is carried out on three high-energy beam lines at up to 72 MeV in a well equipped experiment hall. This beam typically has an emittance of one to two mm-rad (rms, normalized) at a charge of about half a nC. The electron bunch length is adjustable from 10 ps down to about a quarter of a ps. The beam macropulse repetition rate is between 1 and 3 pps. The charge is continuously variable up to about a nC. Besides the electron beam the ATF provides high power laser beams synchronized to the electron beam to a picosecond. The laser beams consist of a Nd:YAG laser at about 20 mJ over 20 ps and a CO2 laser at about 20 Joule over 150 ps. An upgrade program of the CO2 laser is underway and we expect to provide 10 Joules in 10 ps in the very near future. We invite you to join us at the ATF Users' Meeting and learn about the research opportunities. In you have an experiment that you would like to run at the ATF we encourage you to submit a proposal to Dr. Robert Palmer, by December 15, 2003. You are welcome to contact me at (631) 344-5143 or by email, ilan@bnl.gov for technical details concerning the ATF capabilities. Comprehensive information is available on the web at http://www.bnl.gov/atf/Menu.html <http://www.bnl.gov/atf/Menu.html> , including description of past and present experiments. If you plan to attend, return the attached registration form to Kathleen Tuohy. Contact numbers and address are provided on the form. Please pass this information on to other interested colleagues.

 Sincerely yours,

 Ilan Ben-Zvi,

Director, BNL ATF.