PAC09 - List of Authors (Froehlich, L.)

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Froehlich, L.

Paper	Title	Page
WE6PFP109	Operation of the FLASH Linac with Long Bunch Trains and High Average Current	2766
	N.J. Walker, V. Ayvazyan, L. Froehlich, M.K. Grecki, S. Schreiber DESY, Hamburg J. Carwardine ANL, Argonne B. Chase, M.A. Davidsaver Fermilab, Batavia T. Matsumoto, S. Michizono KEK, Ibaraki
	Funding: Work at Argonne supported by U.S. Department of Energy, Office of Science, office of Basic Energy, Sciences, under Contract No. DE-AC02-06CH11357 XFEL and ILC both intend to accelerate long beam pulses of a few thousand bunches and high average current. It is expected that the superconducting accelerating cavities will eventually be operated close to their respective gradient limits as they are pushed to higher energies. In addition, a relative energy stability of <10^-4 must be maintained across all bunches. These parameters will ultimately push the limits of several sub systems including the low-level rf control, which must properly compensate for the heavy beam loading while avoiding problems from running the cavities close to their quench limits. An international collaboration led by DESY has begun a program of study to demonstrate such ILC-like conditions at FLASH, which serves as a prototype for both XFEL and ILC. The objective is to achieve reliable operation with pulses of 2400 3-nC bunches spaced by 330 ns (a current of 9 mA) while meeting the required energy stability and while operating accelerating cavities close to their quench limits. Other goals include measurement of cryoload from HOM heating and evaluation of rf power overhead for the ILC. The paper will describe the program and report recent results.

Paper

Title

Page

WE6PFP109

Operation of the FLASH Linac with Long Bunch Trains and High Average Current

2766

N.J. Walker, V. Ayvazyan, L. Froehlich, M.K. Grecki, S. Schreiber
DESY, Hamburg
J. Carwardine
ANL, Argonne
B. Chase, M.A. Davidsaver
Fermilab, Batavia
T. Matsumoto, S. Michizono
KEK, Ibaraki

Funding: Work at Argonne supported by U.S. Department of Energy, Office of Science, office of Basic Energy, Sciences, under Contract No. DE-AC02-06CH11357

XFEL and ILC both intend to accelerate long beam pulses of a few thousand bunches and high average current. It is expected that the superconducting accelerating cavities will eventually be operated close to their respective gradient limits as they are pushed to higher energies. In addition, a relative energy stability of <10^-4 must be maintained across all bunches. These parameters will ultimately push the limits of several sub systems including the low-level rf control, which must properly compensate for the heavy beam loading while avoiding problems from running the cavities close to their quench limits. An international collaboration led by DESY has begun a program of study to demonstrate such ILC-like conditions at FLASH, which serves as a prototype for both XFEL and ILC. The objective is to achieve reliable operation with pulses of 2400 3-nC bunches spaced by 330 ns (a current of 9 mA) while meeting the required energy stability and while operating accelerating cavities close to their quench limits. Other goals include measurement of cryoload from HOM heating and evaluation of rf power overhead for the ILC. The paper will describe the program and report recent results.