110 research outputs found
Composite Dirac Neutrinos
We present a mechanism that naturally produces light Dirac neutrinos. The
basic idea is that the right-handed neutrinos are composite. Any realistic
composite model must involve `hidden flavor' chiral symmetries. In general some
of these symmetries may survive confinement, and in particular, one of them
manifests itself at low energy as an exact symmetry. Dirac neutrinos are
therefore produced. The neutrinos are naturally light due to compositeness. In
general, sterile states are present in the model, some of them can naturally be
warm dark matter candidates.Comment: 12 pages; Sec. IIC updated; minor corrections; published versio
Design of an interaction region with head-on collisions for the ILC
An interaction region (IR) with head-on collisions is considered as an
alternative to the baseline configuration of the International Linear Collider
(ILC) which includes two IRs with finite crossing-angles (2 and 20 mrad).
Although more challenging for the beam extraction, the head-on scheme is
favoured by the experiments because it allows a more convenient detector
configuration, particularly in the forward region. The optics of the head-on
extraction is revisited by separating the e+ and e- beams horizontally, first
by electrostatic separators operated at their LEP nominal field and then using
a defocusing quadrupole of the final focus beam line. In this way the septum
magnet is protected from the beamstrahlung power. Newly optimized final focus
and extraction optics are presented, including a first look at post-collision
diagnostics. The influence of parasitic collisions is shown to lead to a region
of stable collision parameters. Disrupted beam and beamstrahlung photon losses
are calculated along the extraction elements
Measurement with beam of the deflecting higher order modes in the TTF superconducting cavities
This paper reports on recent beam measurements of higher order modes in the TESLA Test Facility (TTF) accelerating modules. Using bunch trains of about 0.5 ms with 54MHz bunch repetition and up to 90% modulated intensity, transverse higher order modes are resonantly excited when the beam is offset and their frequency on resonance with the modulation frequency. With this method, the trapped modes can be excited and their counteraction on the beam observed on a wide-band BPM downstream of the module. Scanning the modulation frequency from 0 to 27MHz allows a systematic investigation of all possible dangerous modes in the modules
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Monitoring the FLASH Cryomodule Transportation from DESY Hamburg to CEA Saclay: Coupler Contact, Vacuum, Acceleration and Vibration Analysis
With a view to the series production of one hundred, 12 m long XFEL 1.3 GHz cryomodules and their transportation from the assembly site at CEA Saclay (F) to the installation site at DESY Hamburg (D) a test transportation of a FLASH cryomodule has been performed, in the condition foreseen for the mass transportation. The present study examines the stresses induced on the module and verifies the damping capabilities of the transport frame in order to minimize risk of damage to the most critical components. During the transportation, acceleration and vibration have been monitored as well as coupler antenna contacts and vacuum performances. This paper describes the analysis performed and compares those results to the data of a similar transportation study at Fermilab for the CM1 cryomodule
The BDSLD task: Summary and deliverables (Overview of EuroTeV results on the optical design of the Linear Collider Beam Delivery System)
This report is the deliverable of the EUROTeV Beam Delivery System Lattice Design (BDSLD) and gives an overview of the published results
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