IPAC2013 - List of Authors (Tavares, P.F.)

Paper	Title	Page
TUPWA005	Study of Collective Beam Instabilities for the MAX IV 3 GeV Ring	1730
	M. Klein, R. Nagaoka SOLEIL, Gif-sur-Yvette, France G. Skripka, P.F. Tavares, E.J. Wallén MAX-lab, Lund, Sweden
	The present paper reports on a systematic simulation study made on the collective beam instability in the MAX IV 3 GeV ring. We study both single and multibunch instabilities in the longitudinal plane. Specifically, we focus on the microwave instabilities which are considered to be particularly dangerous for MAX IV, in view of its small effective radius of aperture (b_eff < 11 mm), the high intensity (500 mA) and the low emittance (0.24 nm.rad) nature of the circulating beam. Single and multibunch tracking are performed using wake fields that were numerically obtained using GdfidL for the ensemble of the vacuum components. A special effort was made to include dynamically the effect of harmonic cavities that lengthen the bunch and introduce Landau damping, whose details are described in the companion paper . The study aims to confirm the effectiveness of storing long bunches in the 100 MHz RF system, where tune spreads are further increased by the harmonic cavities, in order to fight against collective instabilities. M. Klein and R. Nagaoka "Multibunch Tracking Code Development to Account for Passive Landau Cavities", these proceedings

TUPWA038	Equilibrium Bunch Density Distribution with Passive Harmonic Cavities in the MAX IV 3 GeV Storage Ring	1790
	P.F. Tavares, Å. Andersson, A. Hansson MAX-lab, Lund, Sweden
	The MAX IV storage rings will use third harmonic cavities operated passively to lengthen the bunches and alleviate collective instabilities. These cavities are an essential ingredient in the MAX IV design concept and are required for achieving the final design goals in terms of stored current, beam emittance and beam lifetime. This paper reports on fully self-consistent calculations of the longitudinal bunch density distribution in the MAX IV 3 GeV storage ring, which indicate that up to a factor 5 increase in RMS bunch length is achievable with a purely passive system.

THPFI043	The Status of the Vacuum System of the MAX IV Laboratory	3382
	E. Al-Dmour, J. Ahlbäck, D. Einfeld, M.J. Grabski, P.F. Tavares MAX-lab, Lund, Sweden Ł. Walczak Solaris, Kraków, Poland
	All the vacuum chambers of the 3 GeV storage ring of MAX IV laboratory are under production. NEG coating R&D has been done to validate technical solutions for the coating process. The standard vacuum chambers for the 1.5 GeV ring of MAX IV and Solaris are designed and they are in the procurement process. We present an update in the technical design of the vacuum chambers following the interaction with the manufacture, the implications on the production due to NEG coating and the design of the vacuum chambers of the 1.5 GeV storage ring.

THPFI044	NEG Thin Film Coating Development for the MAX IV Vacuum System	3385
	M.J. Grabski, J. Ahlbäck, E. Al-Dmour, P.F. Tavares MAX-lab, Lund, Sweden S. Calatroni, P. Chiggiato, P. Costa Pinto, M. Taborelli CERN, Geneva, Switzerland
	The new synchrotron radiation facility of the MAX IV laboratories is under construction and expected to deliver the first light beam in 2016. To cope with the small aperture, the intense photon bombardment and the low-pressure requirement, most of the beam pipes for the 3-GeV ring are going to be coated with Ti-Zr-V non-evaporable getter (NEG) thin films. To take advantage from the experience acquired during the construction of the Large Hadron Collider (LHC), collaboration between CERN and MAX IV Laboratories has been set up. The choice of the extruded Cu tubes, the preliminary surface treatments, the coating configuration, and the performance validation of the small-diameter vacuum chambers have been addressed. In parallel, an intense development has been tackled at CERN for the coating of vacuum chambers where photon and electron beams circulate in separate pipes. The most important results of the collaboration are presented and future perspectives pointed out.

Paper

Title

Page

Study of Collective Beam Instabilities for the MAX IV 3 GeV Ring

1730

M. Klein, R. Nagaoka
SOLEIL, Gif-sur-Yvette, France
G. Skripka, P.F. Tavares, E.J. Wallén
MAX-lab, Lund, Sweden

The present paper reports on a systematic simulation study made on the collective beam instability in the MAX IV 3 GeV ring. We study both single and multibunch instabilities in the longitudinal plane. Specifically, we focus on the microwave instabilities which are considered to be particularly dangerous for MAX IV, in view of its small effective radius of aperture (b_eff < 11 mm), the high intensity (500 mA) and the low emittance (0.24 nm.rad) nature of the circulating beam. Single and multibunch tracking are performed using wake fields that were numerically obtained using GdfidL for the ensemble of the vacuum components. A special effort was made to include dynamically the effect of harmonic cavities that lengthen the bunch and introduce Landau damping, whose details are described in the companion paper *. The study aims to confirm the effectiveness of storing long bunches in the 100 MHz RF system, where tune spreads are further increased by the harmonic cavities, in order to fight against collective instabilities.
* M. Klein and R. Nagaoka "Multibunch Tracking Code Development to Account for Passive Landau Cavities", these proceedings

TUPWA038

Equilibrium Bunch Density Distribution with Passive Harmonic Cavities in the MAX IV 3 GeV Storage Ring

1790

P.F. Tavares, Å. Andersson, A. Hansson
MAX-lab, Lund, Sweden

The MAX IV storage rings will use third harmonic cavities operated passively to lengthen the bunches and alleviate collective instabilities. These cavities are an essential ingredient in the MAX IV design concept and are required for achieving the final design goals in terms of stored current, beam emittance and beam lifetime. This paper reports on fully self-consistent calculations of the longitudinal bunch density distribution in the MAX IV 3 GeV storage ring, which indicate that up to a factor 5 increase in RMS bunch length is achievable with a purely passive system.

THPFI043

The Status of the Vacuum System of the MAX IV Laboratory

3382

E. Al-Dmour, J. Ahlbäck, D. Einfeld, M.J. Grabski, P.F. Tavares
MAX-lab, Lund, Sweden
Ł. Walczak
Solaris, Kraków, Poland

All the vacuum chambers of the 3 GeV storage ring of MAX IV laboratory are under production. NEG coating R&D has been done to validate technical solutions for the coating process. The standard vacuum chambers for the 1.5 GeV ring of MAX IV and Solaris are designed and they are in the procurement process. We present an update in the technical design of the vacuum chambers following the interaction with the manufacture, the implications on the production due to NEG coating and the design of the vacuum chambers of the 1.5 GeV storage ring.

THPFI044

NEG Thin Film Coating Development for the MAX IV Vacuum System

3385

M.J. Grabski, J. Ahlbäck, E. Al-Dmour, P.F. Tavares
MAX-lab, Lund, Sweden
S. Calatroni, P. Chiggiato, P. Costa Pinto, M. Taborelli
CERN, Geneva, Switzerland

The new synchrotron radiation facility of the MAX IV laboratories is under construction and expected to deliver the first light beam in 2016. To cope with the small aperture, the intense photon bombardment and the low-pressure requirement, most of the beam pipes for the 3-GeV ring are going to be coated with Ti-Zr-V non-evaporable getter (NEG) thin films. To take advantage from the experience acquired during the construction of the Large Hadron Collider (LHC), collaboration between CERN and MAX IV Laboratories has been set up. The choice of the extruded Cu tubes, the preliminary surface treatments, the coating configuration, and the performance validation of the small-diameter vacuum chambers have been addressed. In parallel, an intense development has been tackled at CERN for the coating of vacuum chambers where photon and electron beams circulate in separate pipes. The most important results of the collaboration are presented and future perspectives pointed out.