RUPAC2012 - List of Authors (Chetvertkova, V.)

Paper	Title	Page
MOPPA031	Residual Activity in Heavy-Ion Accelerators as Beam-Loss Limiting Factor	302
	V. Chetvertkova IAP, Frankfurt am Main, Germany V. Chetvertkova, E. Mustafin, I. Strašík GSI, Darmstadt, Germany
	Residual activity is the main beam-loss limiting factor in high-energy proton accelerators. In order to ensure 'hands-on' maintenance the losses of proton beam should be kept below 1 W/m. It has been shown in our previous publications that the beam-loss criteria for heavy-ion machines may be established by rescaling the '1 W/m criterion' for different heavy ions. For protons the scaling factor is obviously 1. Scaling factors for other ions depend on the charge-mass number of the ion and on the beam energy. For example, for U ions with energy E = 200 MeV/u the scaling factor is 60, i.e. 60 W/m losses of U beam are tolerable from the 'hands-on' maintenance point of view, whereas for U ions with E=1 GeV/u the scaling factor is just 5. In the present paper we show that this scaling factor concept has natural limits of applicability. In the case of very low beam energies or in the case of estimates of long-term accumulated residual activity the tolerable beam-loss criteria cannot be obtained by simple rescaling '1 W/m criterion' with one single number.

Paper

Title

Page

Residual Activity in Heavy-Ion Accelerators as Beam-Loss Limiting Factor

302

V. Chetvertkova
IAP, Frankfurt am Main, Germany
V. Chetvertkova, E. Mustafin, I. Strašík
GSI, Darmstadt, Germany

Residual activity is the main beam-loss limiting factor in high-energy proton accelerators. In order to ensure 'hands-on' maintenance the losses of proton beam should be kept below 1 W/m. It has been shown in our previous publications that the beam-loss criteria for heavy-ion machines may be established by rescaling the '1 W/m criterion' for different heavy ions. For protons the scaling factor is obviously 1. Scaling factors for other ions depend on the charge-mass number of the ion and on the beam energy. For example, for U ions with energy E = 200 MeV/u the scaling factor is 60, i.e. 60 W/m losses of U beam are tolerable from the 'hands-on' maintenance point of view, whereas for U ions with E=1 GeV/u the scaling factor is just 5. In the present paper we show that this scaling factor concept has natural limits of applicability. In the case of very low beam energies or in the case of estimates of long-term accumulated residual activity the tolerable beam-loss criteria cannot be obtained by simple rescaling '1 W/m criterion' with one single number.