It is proposed to store protons as well as electrons and positrons in the DESY storage ring, DORIS, The techniques planned for accomplishing this and the hoped for results are described.
The angular dependence of bremsstrahlung energy loss of 1 MeV electrons has been measured at 30 ~ 60 ~ and 90 ~ The electrons were scattered on aluminium, silver and gold foils of thickness from 0.t to 2'3 mg/cm 2. The shape of the energy loss distribution between 20 and 100 keV has been found in accordance with theory which giveswhere F is nearly I. The experimental values of c (E o, Vao) agree with the theoretical ones within an error of 4-3%.
A. EinleitungSeit der quantentheoretischen Berechnung der Bremsstrahlung durch SOIVIMERFELD 1, BETHE und HEITLER 2 sind eine Reihe experimenteller Untersuchungen durchgefiihrt worden, die entweder die Winkel-und Energieverteilung der abgestrahlten Photonen 3 oder dell Energieverlust der Elektronen 4 zum Ziele hatten. Im letzteren Falle hat man sich bisher nur mit dem totalen Energieverlust besch~iftigt, zu dem haupt-s~tchlich die Verluste bei kleinen Ablenkwinkeln beitragen. Nun haben die theoretischen Arbeiten yon SCHWINGER 5 und anderen fiber Strahlungskorrekturen das Interesse auf die Winkelabhiingigkeit des Bremsstrahlungsverlustes gelenkt. Diese ist zuerst yon RACAtt6 in erster Bornscher N~iherung berechnet worden. Ftir kleine Energieverluste ist die Form der Verteilung unabh/ingig vom Winkel und f~tllt umgekehrt proportional zum Energieverlust ab. Die Integration tiber den Wirkungsquerschnitt ergibt daher keinen endlichen Wert (Infrarotkatastrophe). Die L6sung dieses Problems ist erst durch die neueren Methoden 1 SO~MERFELD,
During the last year the e-e+-storage ring DORIS was changed from a 2 x3,5 GeV double ring with 2 x 480 bunches circulating to a single ring single bunch machine with a maximum energy of 2 x5.1 GeV. The modifications in the magnet structure and of the rf system are described. The main problems at higher energie,s were due to magnet saturation and insufficient sextupole strength. To overcome transverse instabilities, a feedback system had to be used. Experimental data in the c.m. energy range of 9.5 to 10.1 GeV were taken successfully with luminosities up to 25 nb-1 per day.
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