RF Cavity Breakdown in External Magnetic Field
نویسندگان
چکیده
Neutrino Factories and Muon Colliders’ cooling lattices require both high gradient rf and strong focusing solenoids. Experiments have shown that there may be serious problems operating rf in the required magnetic fields. It is proposed that electrons emitted from asperities on one side of a cavity are focused by the magnetic field to the other side where they damage the cavity surface in small spots. The theory is fitted to existing 805 MHz data and predictions are made for performance at 201 MHz. A possible solutions to these problems is magnetically insulated rf in which the cavity walls are designed to be parallel to a chosen magnetic field contour line and consequently damage from field emission is suppressed.
منابع مشابه
Open Cavity Solutions to the RF in Magnetic Field Problem
It has been observed [1] that breakdown in an 805 MHz pill-box cavity occurs at much lower gradients as an external axial magnetic field is increased. This effect was not observed with on open iris cavity. It is proposed that this effect depends on the relative angles of the magnetic and maximum electric fields: parallel in the pill-box case; at an angle in the open iris case. If so, using an o...
متن کاملThe Interactions of Surface Damage and Rf Cavity Operation∗
Studies of low frequency RF systems for muon cooling has led to a variety of new techniques for looking at dark currents, a new model of breakdown, and, ultimately, a model of RF cavity operation based on surface damage. We find that cavity behavior is strongly influenced by the spectrum of enhancement factors on field emission sites. Three different spectra are involved: one defining the initi...
متن کاملINVESTIGATION ON THE EFFECTS OF MAGNETIC FIELD ON BROMIDE-INDUCED PITTING OF COMMERCIALLY PURE TITANIUM
Abstract: In chloride salt solutions, titanium alloys exhibit reasonably high pitting potentials as high as +10 V (vs. Ag/AgCl) at room temperatures. On the other hand, anodic pitting potentials are significantly lower in bromide solutions. In this study, pitting corrosion of commercially pure titanium in aqueous NaBr solution of 0.1 M concentration at room temperature was studied and the e...
متن کاملنگاهی جدید در طراحی مدار بسامد رادیویی سطح پایین کارا برای سیکلوترون 10 مگا الکترون ولت
The electric field in cavity accelerates charged particles and magnetic field of magnets changes the direction of these particles in cyclotrons. In order to establish the electric field inside the cavity, a noiseless radio frequency (RF) signal should be generated, amplified and sent to cavity. The resonant frequency of the cavity could be changed by temperature variation. Variation of resonant...
متن کاملThe Frequency Dependence of Superconducting Cavity Q . . - and Magnetic Breakdown Field
A theoretical-explanation is given to account for the unexpected observation that L-band Nb superconducting cavities were found to have lower Q and lower magnetic breakdown field than those of the higher X-band frequencies 0 Both effects can be related to the trapping of magnetic flux in the cavity walls. The frequency dependence arises from the frequency dependence of the resistivity of oscill...
متن کامل