First tests at injector for the s-Band Test Facility at DESY

CLARA conceptual design report

“…To further reduce the effect of these environmental issues, the LLRF system will be equipped with a calibration system [108], this will measure the path length phase and amplitude of the RF drive system on every pulse, monitoring slow changes in the system and applying corrections to the drive set points, this will bring the system long term stability up as high as possible. In addition the use of beam monitoring systems (beam arrival monitors and bunch compression monitors) will provide electron beam measurement and timing stability information that will be used to provide feedback to the RF phase and amplitude at a rate of up to 1/10th of the machine repetition rate [109].…”

The S-Band Linear Collider Test Facility at DESY

“…The injector, combining high bunchcharge with short interbunch spacing, was designed by means of EGUN and PARMELA calculations [1]. The pulses of desired charge in a train of adequate timestructure are generated at a 90kV thermionic gun and compressed by means of two standing wave subharmonic bunchers SHB1 p m rad Table 1: Main parameters of the S-Band test linac (125MHz/34kV) and SHB2 (500MHz/36kV) as well as two S-Band travelling wave structures TWB1 (b=0.6, 4cells, 2p/3, 7MV/m) and TWB2 (b=0.95, 16cells, 8p/9, 12MV/m).…”

“…Starting in april 1995 with a short beamline dedicated for commissioning of the bunchtrain production at the gun, a longer beamline including both SHB's investigated their bunching performance from autumn 1995 to end of june 1996 [2]. The present setup started its operation in autumn 1996.…”