lead ion tests in lear ppc - 19 septembre 1997 m. chanel

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LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL Slide 2 PARTICIPANTS D. Allen L. Badano D. Berlin J.L. Blanc J. Bosser B. Bouriquet H. Broere R. Brown C. Carli M. Chanel J. Duran-Lopez F. Formis A. Fowler H. Haseroth C. Hill S. Jacobsen C. Lacroix A. Lombardi R. Maccaferri P. Maesen S. Maury K. Metzmacher D. Mhl G. Molinari B. Moine H. Mulder F. Nanni M. ONeil J.C. Perrier U. Raich S. Rossi E. Roux J. Sanchez R. Sautier E. Tanke G. Tranquille M. Vretenar et les autres Slide 3 LES MODIFICATIONS DE LEAR Lear adapted for slow extraction and jetset Lear adapted for Multiturn injection and long ecool: -line transfo(2) -bumpers, move SEH -exchange s2/s3 -ecool 3m drift -vacuum improvements Slide 4 Longer, more negs, magnetic measurements, new controls, smooth continuous tube(no natural neutralisation) Slide 5 Caractristiques des Machines Machine 1 Cooler: D=3.5m, h =1.7m, v =6.5m Injection:D=3.5m, h =1.7m, v =6.5m Machine 97 Cooler: D=0 m, h =5 m v =4.4m Injection:D=10 m, h =3.3m v =6.6m Machine 4/96 Cooler: D=0 m, h =9.5 m, v =7m Injection: D=0 m, h =9.5 m, v =7m Slide 6 LE REFROIDISSEMENT EN INJECTION MONOTOUR La charge despace Le cooling des grandes mittances les comparaisons des diffrentes machines Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 TRANSVERSE COOLING OF LARGE AMPLITUDES Slide 12 MEASURED TRANSVERSE COOLING OF LARGE AMPLITUDES beam partially kicked, Ie=120 mA, machine 1, eps=22 pi Top view longitudinal SchottkyTop view horizontal Schottky Time[160ms tot.] dp/p[4%o tot] df/f[4%o tot] Time[160ms tot.] Pbrk09 Slide 13 MEASURED COOLING OF A MONOTURN INJECTED BEAM Ie=52 mA, machine 97 Top view longitudinal SchottkyTop view horizontal Schottky Time[1 s tot.] pb97g03 Slide 14 MEASURED COOLING OF A MONOTURN INJECTED BEAM Ie=52 mA, machine 97 BIPMH: one measurement every 50ms here at 0, 200, 350, 1000 ms BIPMH:evolution of beam dimension [mm] sum Time[ms] pb97g03 Slide 15 Machine 1-97 260mA pbb013 Top view longitudinal Schottky Top view horizontal Schottky Time[450ms tot.] dp/p[4%o tot] Slide 16 Machine 1-96 256mA pb96009 Top view longitudinal SchottkyTop view horizontal Schottky Time[400ms tot.] dp/p[4%o tot] Slide 17 Machine 1-97 260mA better adjusted pbb021 Top view longitudinal SchottkyTop view horizontal Schottky Time[300ms tot.] dp/p[4%o tot] Slide 18 MEASURED COOLING OF A MONOTURN INJECTED BEAM BY BIPM Compare.xls PRELIMINARY Slide 19 Comparaison cooling rates 97/96 Compare.xls PRELIMINARY Slide 20 Compare.xls Slide 21 LINJECTION MULTITOURS COMBINE Le Principe Le LinacIII Les bumpers Le rsultat sur la machine 97 Consquences sur le vide Slide 22 Le principe Pendant la dcroissance du bump, augmenter P du faisceau inject tel que le point dinjection reste le mme (D grand). Le septum Compare.xls Slide 23 Le linacIII Change the amplitude of Tank 3. Change the phase of the Debuncher All in 80 to 200 s Phase debuncher Tank3 amplitude Linac3.pcx Slide 24 Les bumpers 4 bumpers with 4 individual power supplies. 4 slopes (15, 25, 70 200 s). The kick at 340/MeV/c/charge is 10 mrad max Bumpers.pcx Slide 25 Les rsultats 4 (-1 to 3) injected. Up to 6 10 9 charges per injection with machine 97 and 200 s bump fall. With injection all day long, degradation of vacuum. Spectre.pcx Slide 26 Consquences sur le vide Losses due to multiturn injection, charge exchange with rsidual gases and lectron recombination give outgassing of vacuum chamber and specially BIPM( Vespel , Kapton ). Limit accumulation (next chapter) and gives life time of less than 1 s. BIPMV out gives 5 s. during accumulation with Ie=100 mA. Slide 27 LA MULTI-INJECTION Le principe les rsultats Slide 28 Le Principe Inject a beam and cool it to -x in momentum in less than the rptition cycle. -x is such that the stack is not lossed during next injection The cooling could be done using beam dragging for machine with zro- dispersion at the cooler Slide 29 Les rsultats Up to 1.7 10 10 charges accumulated (saturation effect due to vacuum degradation and other beam losses) using machine 97 and Ie=100 mA. Cooling time with dragging is less than 400 ms. Multishots.xls Slide 30 Multi-injection seen on transfo Stacking.pcx Slide 31 MULTI-INJECTION WITH MACHINE 97 (Ie=110mA, ht=10V,300ms,R=50 ms) Top view of long. SchottkyTop view horizontal Schottky pbc027 Time[1000ms tot.] dp/p[4%o tot] Slide 32 MULTI-INJECTION WITH MACHINE 97 (Ie=110mA, ht=10V,300ms,R=50 ms) BIPMH Tcool1.xls Slide 33 MULTI-INJECTION WITH MACHINE 1 The first tests show that no dragging is (needed) possible. Cooling with Ie=100mA is about 400 ms. Slide 34 CONCLUSIONS Ecool 2 times longer give ~2 times more cooling rate Machine 97 good for combined multi-turn injection beam stacking up to 1.7 10 10 charges is working well machine 1 not completely tested stacking at 3 Hz rate not tested Good vacuum quality very important Still to do