2011 Particle Accelerator Conference - List of Authors (Tomas, R.)

Paper

Title

Page

Beam Losses Due to Abrupt Crab Cavity Failures in the LHC

76

R. Calaga
BNL, Upton, Long Island, New York, USA
T. Baer, J. Barranco, R. Tomás, J. Wenninger, F. Zimmermann
CERN, Geneva, Switzerland
B. Yee-Rendon
CINVESTAV, Mérida, Mexico

Funding: This work partially supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP).
A major concern for the implementation of crab crossing in a future high-luminosity LHC (HL-LHC) is machine protection in an event of a fast crab-cavity failure. Certain types of abrupt crab-cavity phase and amplitude changes are simulated to characterize the effect of failures on the beam and the resulting particle-loss signatures. The time-dependent beam loss distributions around the ring and particle trajectories obtained from the simulations allow for a first assessment of the resulting beam impact on LHC collimators and on sensitive components around the ring. The simulation results are used to derive tolerances on the maximum rate of change in crab-cavity phase and amplitude which can be allowed with regard to machine safety.

Slides MOODN4 [1.620 MB]

THP109

Dielectric Collimators for Linear Collider Beam Delivery System

2330

A. Kanareykin, P. Schoessow
Euclid TechLabs, LLC, Solon, Ohio, USA
S. Baturin
LETI, Saint-Petersburg, Russia
R. Tomás
CERN, Geneva, Switzerland

Funding: US Department of Energy
The current status of ILC and CLIC concepts require additional research on wakefield reduction in the collimator sections. New materials and new geometries have been considered recently*. Dielectric collimators for the CLIC Beam Delivery System have been discussed with a view to minimize the BDS collimation wakefields**. Dielectric collimator concepts for the linear collider are presented in this paper; cylindrical and planar collimators for the CLIC parameters have been considered, and simulations to minimize the beam impedance have been performed. The prototype collimator system is planned to be fabricated and experimentally tested at Facilities for Accelerator Science and Experimental Test Beams (FACET) at SLAC.
*J.R.Lopez. ILC-CLIC Beam Dynamics Workshop. CERN, Geneva, 23-25 June, 2009.
**R. Tomas. ILC-CLIC Beam Dynamics Workshop. CERN, Geneva, 23-25 June, 2009.

Paper	Title	Page
MOODN4	Beam Losses Due to Abrupt Crab Cavity Failures in the LHC	76
	R. Calaga BNL, Upton, Long Island, New York, USA T. Baer, J. Barranco, R. Tomás, J. Wenninger, F. Zimmermann CERN, Geneva, Switzerland B. Yee-Rendon CINVESTAV, Mérida, Mexico
	Funding: This work partially supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP). A major concern for the implementation of crab crossing in a future high-luminosity LHC (HL-LHC) is machine protection in an event of a fast crab-cavity failure. Certain types of abrupt crab-cavity phase and amplitude changes are simulated to characterize the effect of failures on the beam and the resulting particle-loss signatures. The time-dependent beam loss distributions around the ring and particle trajectories obtained from the simulations allow for a first assessment of the resulting beam impact on LHC collimators and on sensitive components around the ring. The simulation results are used to derive tolerances on the maximum rate of change in crab-cavity phase and amplitude which can be allowed with regard to machine safety.
	Slides MOODN4 [1.620 MB]

THP109	Dielectric Collimators for Linear Collider Beam Delivery System	2330
	A. Kanareykin, P. Schoessow Euclid TechLabs, LLC, Solon, Ohio, USA S. Baturin LETI, Saint-Petersburg, Russia R. Tomás CERN, Geneva, Switzerland
	Funding: US Department of Energy The current status of ILC and CLIC concepts require additional research on wakefield reduction in the collimator sections. New materials and new geometries have been considered recently. Dielectric collimators for the CLIC Beam Delivery System have been discussed with a view to minimize the BDS collimation wakefields. Dielectric collimator concepts for the linear collider are presented in this paper; cylindrical and planar collimators for the CLIC parameters have been considered, and simulations to minimize the beam impedance have been performed. The prototype collimator system is planned to be fabricated and experimentally tested at Facilities for Accelerator Science and Experimental Test Beams (FACET) at SLAC. J.R.Lopez. ILC-CLIC Beam Dynamics Workshop. CERN, Geneva, 23-25 June, 2009. **R. Tomas. ILC-CLIC Beam Dynamics Workshop. CERN, Geneva, 23-25 June, 2009.