Author: Liuzzo, S.M.
Paper Title Page
WEPC013 Tests for Low Vertical Emittance at Diamond using LET Algorithm 2031
 
  • S.M. Liuzzo, M.E. Biagini, P. Raimondi
    INFN/LNF, Frascati (Roma), Italy
  • R. Bartolini
    JAI, Oxford, United Kingdom
  
  We pre­sent mea­sure­ments re­cent­ly per­formed at the Di­a­mond Light Source, aimed at the achieve­ment of low ver­ti­cal emit­tance using the Low Emit­tance Tun­ing (LET) al­go­rithm de­vel­oped for a Su­perB fac­to­ry pro­ject present­ly in progress. The tests have been fo­cused on the com­par­i­son be­tween this method and the LOCO al­go­rithm cur­rent­ly used at Di­a­mond. Beam po­si­tion mon­i­tor tilts es­ti­mate and mul­ti­ple cou­pling re­sponse ma­tri­ces have been in­tro­duced in the al­go­rithm in order to op­ti­mize the pro­ce­dure. After few it­er­a­tions using ver­ti­cal cor­rec­tors and skew quadrupoles, very low ver­ti­cal dis­per­sion and emit­tance cou­pling, com­pa­ra­ble to those ob­tained by LOCO, have been mea­sured.  
 
THPC062 SLS Vertical Emittance Tuning 3035
 
  • M. Böge, M. Aiba, N. Milas, A. Streun
    PSI, Villigen, Switzerland
  • S.M. Liuzzo
    INFN/LNF, Frascati (Roma), Italy
  
  To es­tab­lish ul­tra-small ver­ti­cal emit­tances (<1pm­rad @2.86GeV) is one im­por­tant aim of fu­ture lin­ear col­lid­er damp­ing ring op­ti­miza­tion stud­ies* at the SLS. By uti­liz­ing var­i­ous cor­rec­tion tech­niques the SLS is al­ready close to this goal with emit­tances of <2pm.​rad @2.4GeV under the con­straint of main­tain­ing user op­er­a­tion con­di­tions. One of the lim­it­ing con­tri­bu­tions is the re­main­ing spu­ri­ous ver­ti­cal dis­per­sion etay of ~1.4mm which can be re­duced by care­ful re-align­ment and the ap­pli­ca­tion of dis­per­sion-free steer­ing tech­niques. The lat­ter re­quire orbit ma­nip­u­la­tions which are only par­tial­ly com­pat­i­ble with the user op­er­a­tion mode. A first ap­pli­ca­tion of dis­per­sion-free steer­ing tech­niques demon­strates that etay can be re­duced to <1mm at the ex­pense of large orbit ex­cur­sions which re­quire a si­mul­ta­ne­ous be­ta­tron-cou­pling cor­rec­tion by means of skew quadrupoles in order to ben­e­fit in terms of a fur­ther re­duc­tion of ver­ti­cal emit­tance. There­fore pos­si­ble gird­er and mag­net mis­align­ments are an­a­lyzed in sim­u­la­tion which al­lows to lo­cal­ize the sources of etay and to elim­i­nate them by re-align­ment. Fol­low­ing this path the goal to achieve emit­tances close to 1pm­rad is with­in reach.
* In January 2011 the EU-project TIARA (Test Infrastructure and Accelerator Research Area) started with contributions from the SLS as part of the SVET (SLS Vertical Emittance Tuning) work package WP6. 		 
 
THPZ003 The SuperB Project: Accelerator Status and R&D 3684
 
  • M.E. Biagini, S. Bini, R. Boni, M. Boscolo, B. Buonomo, T. Demma, E. Di Pasquale, A. Drago, L.G. Foggetta, S. Guiducci, S.M. Liuzzo, G. Mazzitelli, L. Pellegrino, M.A. Preger, P. Raimondi, U. Rotundo, C. Sanelli, M. Serio, A. Stecchi, A. Stella, S. Tomassini, M. Zobov
    INFN/LNF, Frascati (Roma), Italy
  • M.A. Baylac, O. Bourrion, J.-M. De Conto, N. Monseu, C. Vescovi
    LPSC, Grenoble, France
  • K.J. Bertsche, A. Brachmann, Y. Cai, A. Chao, M.H. Donald, R.C. Field, A.S. Fisher, D. Kharakh, A. Krasnykh, K.C. Moffeit, Y. Nosochkov, A. Novokhatski, M.T.F. Pivi, J.T. Seeman, M.K. Sullivan, S.P. Weathersby, A.W. Weidemann, U. Wienands, W. Wittmer, G. Yocky
    SLAC, Menlo Park, California, USA
  • S. Bettoni
    PSI, Villigen, Switzerland
  • A.V. Bogomyagkov, I. Koop, E.B. Levichev, S.A. Nikitin, I.N. Okunev, P.A. Piminov, D.N. Shatilov, S.V. Sinyatkin, P. Vobly
    BINP SB RAS, Novosibirsk, Russia
  • B. Bolzon, M. Esposito
    CERN, Geneva, Switzerland
  • F. Bosi
    INFN-Pisa, Pisa, Italy
  • L. Brunetti, A. Jeremie
    IN2P3-LAPP, Annecy-le-Vieux, France
  • A. Chancé
    CEA, Gif-sur-Yvette, France
  • P. Fabbricatore, S. Farinon, R. Musenich
    INFN Genova, Genova, Italy
  • E. Paoloni
    University of Pisa and INFN, Pisa, Italy
  • C. Rimbault, A. Variola
    LAL, Orsay, France
  • Y. Zhang
    IHEP Beijing, Beijing, People's Republic of China
  
  The Su­perB col­lid­er pro­ject has been re­cent­ly ap­proved by the Ital­ian Gov­ern­ment as part of the Na­tion­al Re­search Plan. Su­perB is a high lu­mi­nos­i­ty (1036 cm-2 s-1) asym­met­ric e+e− col­lid­er at the Y(4S) en­er­gy. The de­sign is based on a “large Pi­win­s­ki angle and Crab Waist” scheme al­ready suc­cess­ful­ly test­ed at the DAΦNE Phi-Fac­to­ry in Fras­cati, Italy. The pro­ject com­bines the chal­lenges of high lu­mi­nos­i­ty col­lid­ers and state-of-the-art syn­chrotron light sources, with two beams (e+ at 6.7 and e- at 4.2 GeV) with ex­treme­ly low emit­tances and small beam sizes at the In­ter­ac­tion Point. As unique fea­tures, the elec­tron beam will be lon­gi­tu­di­nal­ly po­lar­ized at the IP and the rings will be able to ramp down to col­lide at the tau/charm en­er­gy thresh­old with one tenth the lu­mi­nos­i­ty. The rel­a­tive­ly low beam cur­rents (about 2 A) will allow for low run­ning (power) costs com­pared to sim­i­lar ma­chines. The in­ser­tion of beam lines for syn­chrotron ra­di­a­tion users is the lat­est fea­ture in­clud­ed in the de­sign. The lat­tice has been re­cent­ly mod­i­fied to ac­com­mo­date in­ser­tion de­vices for X-rays pro­duc­tion. A sta­tus of the pro­ject and a de­scrip­tion of R&D in progress will be pre­sent­ed.  
 
THPZ004 DAΦNE Tune-up for the KLOE-2 Experiment 3687
 
  • C. Milardi, D. Alesini, M.E. Biagini, S. Bini, C. Biscari, R. Boni, M. Boscolo, B. Buonomo, A. Clozza, G.O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, M. Esposito, L.G. Foggetta, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, S.M. Liuzzo, F. Marcellini, G. Mazzitelli, L. Pellegrino, M.A. Preger, L. Quintieri, P. Raimondi, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov
    INFN/LNF, Frascati (Roma), Italy
  • S. Bettoni
    PSI, Villigen, Switzerland
  
  Funding: Work supported by the EuCARD research programme within the 'Assessment of Novel Accelerator Concepts' work package (ANAC-WP11).
In its con­tin­u­ous evo­lu­tion DAΦNE, the Fras­cati lep­ton col­lid­er, is start­ing a new run for the KLOE-2 ex­per­i­ment, an up­grad­ed ver­sion of the KLOE one. A new in­ter­ac­tion re­gion, based on the high lu­mi­nos­i­ty Crab-Waist col­li­sion scheme, has been de­signed, built and in­stalled. Sev­er­al ma­chine sub­sys­tems have been re­vised ac­cord­ing to in­no­va­tive de­sign con­cepts in order to im­prove beam dy­nam­ics. Col­li­ma­tors and shield­ings have been up­grad­ed in order to min­i­mize the back­ground rates on the de­tec­tor dur­ing coast­ing as well as in­jec­tion op­er­a­tion. A wide mea­sure­ment cam­paign has been un­der­tak­en to ver­i­fy and quan­ti­fy the ef­fect of the mod­i­fi­ca­tions and to tune-up the col­lid­er in view of the 3 years long da­ta-tak­ing fore­seen to de­liv­er ~5 fb-1 to the ex­per­i­ment.