The Dynamic Beta E ect in CESR
نویسنده
چکیده
In a colliding beam storage ring the Twiss parameters are a ected by the quadrupolar focusing of the beam{beam interaction. Like any quadrupole error this `dynamic beta' e ect is enhanced by running near a half{integer or integer resonance. The recent change in the operating point of CESR so that the horizontal tune is just above a half{integer resonance has resulted in the dynamic beta e ect having a noticeable e ect on CESR operation. Under current colliding beam conditions the resulting change in horizontal beta has exceeded x= x = 0:5. In order to keep the notation as simple as possible while minimizing possible confusion, the following conventions have been adopted:
منابع مشابه
Measurement of Cesr Emittance and Search for Dynamic Effects
We have developed techniques that allow simultaneous measurements of the spatial size of the luminous region and the angular spread of the ee ! + events from the CLEO interaction point of the Cornell ElectronPositron Storage Ring, CESR. These techniques take advantage of the small and well understood resolution of the CLEO tracking system. We use these measurements to extract the horizontal bet...
متن کاملThe Incoherent Long Range Beam - Beam Interaction in CESR
CESR has reached the world's highest luminosity[1] using mutibunch operation. The key to this operation is a horizontal `pretzel' separation of the beams in the arcs and a crossing angle at the IP. The pretzel separation is needed since the counter rotating bunches share the same beam pipe and there is thus a long range beam{beam interaction (LRBBI) between the beams. The e ects of the LRBBI ca...
متن کاملPermeable Materials in the CLEO III Magnetic Field
Two pairs of superconducting magnets will be inserted into CLEO as part of the CESR/CLEO phase III upgrade. Stray elds from the superconducting magnets will a ect the eld quality of the solenoid in the sensitive region of the CLEO detector. This problem was analyzed in [1]. In addition, the superconducting magnets will be supported by an active, high precision positioning system. Parts of the p...
متن کاملKnowledge and attitude of the families with a mental patient about the electroconvulsive therapy at the Ebn-e- Sina psychiatric center of Mashhad
Introduction: Electroconvulsive therapy is the most common and also unique method in ‎psychiatry that is used for treatment of many mental disorders such as major depression, ‎schizophrenia and etc. Despite of safety and usefulness of this method, the patients and ‎families have a great deal of stress about it. This stressful approach caused negative attitudes ‎and difficulties ...
متن کاملEFFECTS OF DESMOPRESSIN ON MEMORY DISORDERS DUE TO ELECTROCONVULSIVE THERAPY (ECT) IN HUMANS
Electroconvulsive therapy (ECT) is an efficient treatment for several neuropsychiatric disorders however a large number of patients develop memory impairment after ECT. Different studies both on animals and human suggest that vasopressin has positive effects on memory and improves cognitive functions. In this randomized, double-blind controlled clinical trial, 50 patients with psychiatric d...
متن کامل