HB2014 - List of Authors (Groening, L.)

Paper

Title

Page

Upgrade of the UNILAC for FAIR

245

L. Groening, A. Adonin, X. Du, R. Hollinger, S. Mickat, A. Orzhekhovskaya, B. Schlitt, G. Schreiber, H. Vormann, C. Xiao
GSI, Darmstadt, Germany
H. Hähnel, U. Ratzinger, R. Tiede
IAP, Frankfurt am Main, Germany

The UNIversal Linear Accelerator (UNILAC) at GSI has served as injector for all ion species from protons for uranium for the past four decades. Especially its 10⁸ MHz Alvarez type DTL providing acceleration from 1.4 MeV/u to 11.4 MeV/u has suffered from material fatigue. The DTL will be replaced by a completely new section with almost the same design parameters, i.e. pulsed current of up to 15 mA of 238U²⁸⁺ at 11.4 MeV/u. However, operation will be restricted to low beam duty cycles as 200 μs at 10 Hz. Since preservation of beam quality is mandatory, a regular focusing lattice, as along an Alvarez section for instance, is aimed for. A new source terminal & LEBT dedicated to operation with 238U⁴⁺ is under design. The uranium sources need to be upgraded in order to provide increased beam brilliances and for operation at 3 Hz. Revision of the subsequent 36 MHz RFQ electrode design has started as well as the layout activities of the section providing transition from the 36 MHz section to the 108 MHz DTL.

Slides WEO1AB01 [1.325 MB]

WEO3LR04

Emittance Transfer in Linacs

289

L. Groening, M.T. Maier, C. Xiao
GSI, Darmstadt, Germany
O.K. Kester
IAP, Frankfurt am Main, Germany

Flat beams feature unequal emittances in the horizontal and vertical phase space. Such beams were created successfully in electron machines by applying effective stand-alone solenoid fringe fields in the electron gun. This contribution is an extension of the method to ion beams and on the decoupling capabilities of such a round-to-flat adaptor. The beam line provides a single-knob tool to partition the horizontal and vertical rms emittances, while keeping the product of the two emittances constant as well as the transverse rms Twiss parameters (beta_x;y and alpha_x;y) in both planes. This single knob is the solenoid field strength. The successful commissioning of the set-up with beam will be presented as well.

Slides WEO3LR04 [1.289 MB]

Paper	Title	Page
WEO1AB01	Upgrade of the UNILAC for FAIR	245
	L. Groening, A. Adonin, X. Du, R. Hollinger, S. Mickat, A. Orzhekhovskaya, B. Schlitt, G. Schreiber, H. Vormann, C. Xiao GSI, Darmstadt, Germany H. Hähnel, U. Ratzinger, R. Tiede IAP, Frankfurt am Main, Germany
	The UNIversal Linear Accelerator (UNILAC) at GSI has served as injector for all ion species from protons for uranium for the past four decades. Especially its 10⁸ MHz Alvarez type DTL providing acceleration from 1.4 MeV/u to 11.4 MeV/u has suffered from material fatigue. The DTL will be replaced by a completely new section with almost the same design parameters, i.e. pulsed current of up to 15 mA of 238U²⁸⁺ at 11.4 MeV/u. However, operation will be restricted to low beam duty cycles as 200 μs at 10 Hz. Since preservation of beam quality is mandatory, a regular focusing lattice, as along an Alvarez section for instance, is aimed for. A new source terminal & LEBT dedicated to operation with 238U⁴⁺ is under design. The uranium sources need to be upgraded in order to provide increased beam brilliances and for operation at 3 Hz. Revision of the subsequent 36 MHz RFQ electrode design has started as well as the layout activities of the section providing transition from the 36 MHz section to the 108 MHz DTL.
	Slides WEO1AB01 [1.325 MB]

WEO3LR04	Emittance Transfer in Linacs	289
	L. Groening, M.T. Maier, C. Xiao GSI, Darmstadt, Germany O.K. Kester IAP, Frankfurt am Main, Germany
	Flat beams feature unequal emittances in the horizontal and vertical phase space. Such beams were created successfully in electron machines by applying effective stand-alone solenoid fringe fields in the electron gun. This contribution is an extension of the method to ion beams and on the decoupling capabilities of such a round-to-flat adaptor. The beam line provides a single-knob tool to partition the horizontal and vertical rms emittances, while keeping the product of the two emittances constant as well as the transverse rms Twiss parameters (beta_x;y and alpha_x;y) in both planes. This single knob is the solenoid field strength. The successful commissioning of the set-up with beam will be presented as well.
	Slides WEO3LR04 [1.289 MB]