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LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL.

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Presentation on theme: "LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL."— Presentation transcript:

1 LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL

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. Möhl 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

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

4 Longer, more negs, magnetic measurements, new controls, smooth continuous tube(no natural neutralisation)

5 Caractéristiques 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

6 LE REFROIDISSEMENT EN INJECTION MONOTOUR La charge despace Le cooling des grandes émittances les comparaisons des différentes machines

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11 TRANSVERSE COOLING OF LARGE AMPLITUDES

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

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

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

15 Machine mA pbb013 Top view longitudinal Schottky Top view horizontal Schottky Time[450ms tot.] dp/p[4%o tot]

16 Machine mA pb96009 Top view longitudinal SchottkyTop view horizontal Schottky Time[400ms tot.] dp/p[4%o tot]

17 Machine mA better adjusted pbb021 Top view longitudinal SchottkyTop view horizontal Schottky Time[300ms tot.] dp/p[4%o tot]

18 MEASURED COOLING OF A MONOTURN INJECTED BEAM BY BIPM Compare.xls PRELIMINARY

19 Comparaison cooling rates 97/96 Compare.xls PRELIMINARY

20 Compare.xls

21 LINJECTION MULTITOURS COMBINÉE Le Principe Le LinacIII Les bumpers Le résultat sur la machine 97 Conséquences sur le vide

22 Le principe Pendant la décroissance du bump, augmenter P du faisceau injecté tel que le point dinjection reste le même (D grand). Le septum Compare.xls

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

24 Les bumpers 4 bumpers with 4 individual power supplies. 4 slopes (15, 25, s). The kick at 340/MeV/c/charge is 10 mrad max Bumpers.pcx

25 Les résultats 4 (-1 to 3) injected. Up to charges per injection with machine 97 and 200 s bump fall. With injection all day long, degradation of vacuum. Spectre.pcx

26 Conséquences sur le vide Losses due to multiturn injection, charge exchange with résidual gases and électron 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.

27 LA MULTI-INJECTION Le principe les résultats

28 Le Principe Inject a beam and cool it to -x in momentum in less than the répétition cycle. -x is such that the stack is not lossed during next injection The cooling could be done using beam dragging for machine with zéro- dispersion at the cooler

29 Les résultats Up to 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

30 Multi-injection seen on transfo Stacking.pcx

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]

32 MULTI-INJECTION WITH MACHINE 97 (Ie=110mA, ht=10V,300ms,R=50 ms) BIPMH Tcool1.xls

33 MULTI-INJECTION WITH MACHINE 1 The first tests show that no dragging is (needed) possible. Cooling with Ie=100mA is about 400 ms.

34 CONCLUSIONS Ecool 2 times longer give ~2 times more cooling rate Machine 97 good for combined multi-turn injection beam stacking up to charges is working well machine 1 not completely tested stacking at 3 Hz rate not tested Good vacuum quality very important Still to do


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