PAC2013 - List of Authors (Stabile, P.)

Paper	Title	Page
TUPSM13	RF Gun Water Temperature Control System at ASTA	661
	P. Stabile, M. Ball, J. Czajkowski, J.D. Firebaugh, P.A. Kasley, P.S. Prieto, T.J. Zuchnik Fermilab, Batavia, USA
	Funding: Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy. A linear electron accelerator is in the late stage of construction at the Advanced Superconducting Test Accelerator (ASTA) facility at Fermilab. The purpose of this accelerator is to operate, study and develop the superconducting cavities and associated systems to be used in future superconducting accelerators. ASTA incorporates an L-band radiofrequency (RF) gun with a coaxial RF input operation at 1.3GHz, based on 1+1/2 cell DESY-type gun, followed by two superconducting cavities. A temperature control system regulates the RF power transmission between 5MW Klystron and the RF Gun. Its role is to maintain the resonant frequency by exploiting the 16.5ppm/°C thermal expansion of the copper. Temperature is regulated by mixing chilled low conductivity water (LCW) with circulating water between the cavity and gun skid located outside the radiation cave. A fine pneumatic actuated valve controls the chilled water flow and in turn is controlled by a feedforward/feedback regulation algorithm. This paper will describe the water temperature control system used to stabilize the tuning frequency of the RF Gun.

Paper

Title

Page

RF Gun Water Temperature Control System at ASTA

661

P. Stabile, M. Ball, J. Czajkowski, J.D. Firebaugh, P.A. Kasley, P.S. Prieto, T.J. Zuchnik
Fermilab, Batavia, USA

Funding: Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
A linear electron accelerator is in the late stage of construction at the Advanced Superconducting Test Accelerator (ASTA) facility at Fermilab. The purpose of this accelerator is to operate, study and develop the superconducting cavities and associated systems to be used in future superconducting accelerators. ASTA incorporates an L-band radiofrequency (RF) gun with a coaxial RF input operation at 1.3GHz, based on 1+1/2 cell DESY-type gun, followed by two superconducting cavities. A temperature control system regulates the RF power transmission between 5MW Klystron and the RF Gun. Its role is to maintain the resonant frequency by exploiting the 16.5ppm/°C thermal expansion of the copper. Temperature is regulated by mixing chilled low conductivity water (LCW) with circulating water between the cavity and gun skid located outside the radiation cave. A fine pneumatic actuated valve controls the chilled water flow and in turn is controlled by a feedforward/feedback regulation algorithm. This paper will describe the water temperature control system used to stabilize the tuning frequency of the RF Gun.