• M. Grieser, R. Bastert, K. Blaum, H. Buhr, D. Fischer, F. Laux, R. Repnow, T. Sieber, A. Wolf, R. von Hahn
  MPI-K, Heidelberg
• A. Noda, H. Souda
  Kyoto ICR, Uji, Kyoto

A cryo­genic stor­age ring (CSR) is under con­struc­tion at MPI für Kern­physik, which will be a unique fa­cil­i­ty for low ve­loc­i­ty phase space cooled ion beams. Among other ex­per­i­ments the cool­ing and stor­age of molec­u­lar ions in there ro­ta­tion­al ground state is planed. To meet this re­quire­ment the ring must pro­vide a vac­u­um with a resid­u­al gas den­si­ty below 10000 molecules/cm³, which will be achieved by cool­ing the vac­u­um cham­ber of the ion beam to 2-10 K. The pro­ject­ed stored beam cur­rent will be in the range of 1 nA - 1 μA. The re­sult­ing low sig­nal strengths on the beam po­si­tion pick­ups, cur­rent mon­i­tors and Schot­tky mon­i­tor put strong de­mands on these di­ag­nos­tics tools. The very low resid­u­al gas den­si­ty of the CSR does not allow using a con­ven­tion­al resid­u­al gas mon­i­tor to mea­sure the pro­file of the stored ion beam. Other meth­ods were in­ves­ti­gat­ed to mea­sure the pro­file of a stored ion beam. In the paper an overview of the CSR di­ag­nos­tics tool and di­ag­nos­tics pro­ce­dures will be given.