Observation of coasting beam at the HERA proton-ring
نویسنده
چکیده
We present data collected with the HERA-B wire target which prove the existence of coasting beam at the HERA proton storage ring. The presented measurements show a strong evidence that the proton machine operation contribute to the coasting beam production, which seems to be not dominated by target impacts. ( 2001 Elsevier Science B.V. All
منابع مشابه
Longitudinal Shottky Signal Monitoring for Protons in Hera
Stable longitudinal behavior of the protons is an important feature for future HERA operation. Specific diagnostic tools must be developed for this reason. In this case a standard wall current monitor is used to detect a beam signal from the incoherent motion of the protons due to both coasting beam and synchrotron oscillations during luminosity operation. This will be helpful to understand the...
متن کاملA Possible Fixed Target Programme for the Polarized HERA Proton Ring
The physics programme for a possible fixed target polarized nucleon-nucleon collision experiment aiming at studying the nucleon spin structure at HERA is described. The experiment named HERA~ N could be realized using an internal polarized gas target in the HERA polarized/unpolarized proton beam. Single spin asymmetry measurements could provide unique information on higher twist contributions. ...
متن کاملLuminosity Upgrade of Hera
After six years of operation the electron proton collider HERA had reached a luminosity of 1:4 10 cm s , very close to the design value. We present an overview on the HERA upgrade project that pursues the goal to further increase the luminosity three-fold by the year 2000. The increase is achieved by reducing the beam cross sections at the IP to 120 30 m (RMS values). If furthermore design curr...
متن کاملSimulation of Ep Instability for a Coasting Proton Beam in Circular Accelerators
Instabilities for a coasting proton beam interacting with electron cloud are discussed. The electron sources are roughly classified into two categories reflecting their initial conditions: that is, the electrons produced at the chamber surface and/or at the beam position. If the beam is stable, it forms a Coulomb static potential around itself. Electrons produced near the beam position are trap...
متن کاملThe Phase Space Dependent Spin Polarization Direction in the Hera Proton Ring at High Energy
In very high energy storage rings the equilibrium spin polarization direction can vary strongly from point to point in phase space. Thus, unless counter measures are taken, the average polarization of the beam can be seriously limited. In this paper we present estimates of this limitation for the HERA proton ring as a function of beam energy and other system parameters, and discuss methods to m...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000