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Antiproton Accumulator Complex (Aac) Performance 614 ANTIPROTON ACCUMULATOR COMPLEX (AAC) PERFORMANCE B. Autin, G. Carron, F. Caspers, V. Chohan, C.D. Johnson, E. Jonest,G. Le Dallic, S. Maury, C. Metzger, D. M6h1, Y. Orlov, F. Pedersen, A. Poncet, J.C. Schnuriger, T.R. Sherwood, C.S. Taylor, L. Thomdahl, S. van der Meer, and D.J. Williams CERN, PS Division, CH-1211 Geneva 23 idied the 2nd March 1990 Abstract Antiproton Production Antiprotons are produced in the target area, debunched and The production beam is focused on the target with 2 pulsed stochastically cooled in the Antiproton Collector (AC) and then quadrupoles. A high density target [11,12] made of iridium (8 transferred to the Antiproton Accumulator (AA) for final cooling ‘and 3 x 5.5 mm) embedded in graphite and enclosed in a sealed, water accumulation into a stack from which bunches are extracted and cooled, titanium container performs well. Despite the higher intensi- transferred IO the differeilt users. During Sp$S runs, the tics of the primary proton beam, no yield degradation due to target performance of the AAC is of crucial importance for the collider damage has been observed, although an irradiated target assembly luminosity. The stacking rate evolved from 1.2 X 1010jijh in early cut open 113,141showed that the iridium is damaged by the thermal 1988 to 5.X X 10’” ij/h in May 1989. A maximum stack intensity of shock, but sufficiently contained to maintain initial yield. 1.3 I x lO’* fj has been obtained. This is comparable to or exceeds Antiprotons emerging from the target are focused and matched into the ACOL project design performance. The Droblems encountered the injection transport line by a collector lens. and the co&&measut& ‘taken are presented. During periods of production for I-EAR only. the excellent AAC performance permits A lithium lens of 20 mm diameter, pulsed at 480 kA, was intemtittent 5 production; which results in low& operating c’ost and the principal collector lens used operationally and yieldecl62 X 10.’ a reduced power consumption F/p on the AC injection orbit after various optimizations. Introduction A 60 mm diameter parabolic aluminium horn operating at 400 kA peak has provided trouble free operation during several op- The ACOL project [1,2,3] design goal was a tenfold erational periods. It is simpler and cheaper to build and operate, but increacc of the antiproton accumulation rate from 6 X 109 p/h to at 400 k.4 its yield is about 10% lower than the 8 20 mm Li-lens. Lack of suitable test area outside the target area has until recently 6 :i 10 1’1i/h, while accumulating into stacks up to 101?h with prevented the exploring of high currents. acceptable transverse emittances. This performance was more or less obtained in May 1989, less than tw’o years after turn-on following the end of the ACOL project, Improvements were made to The above-rrlentioned yields agree with calculations [ 151 exqt for an unexplained factor of 1.5. These calculations a!so a!1fnc:ors which contribute to the stacking r;itr: indicated that an ever better yield could be obtained by using a l 26 GeV/c production bcarn intensity. 36 mm diameter Li-lens pulsed at 1.3 MA, thereby collecting G’s l AC injection yield. emerging at large angles. A collaboration with INP (Novosibirsk, l AC 5 debunching. USSR) was launched early in 1988, and in spring 1989 a 36 mm l AC stochastic cooling rate (p, H, V). diameter Li-lens (originally designed for 800 kA), a coaxial pulse l AA injection orbit precooling rate (p, V). transformer (designed for 1.5 MA), and an associated pulser was l Reliability. ready for test. A flange failure during testing at 1.1 MA forced us to The stochastic cooling rates influence both stacking effi- postpone beam tests until July 1989. These tests were encouraging ciencv and maximum repetition rate. In addition stack intensity with a 20% Z; yield improvement for the nominal production beam and a 40% improvement with lower intensity primary beam (with 1imit;;tionc due to coherent and incoherent instabilities caused b,y lower emittance). :~ccumul;tted ions were identified and cured. Intraheam scattering 15 also a lilnitinl: factor. During subsequent life test in the laboratory, the stainless 26 (;eV/c Proton Production Beam steel container failed after half a million pulses at 1.1 MA. New 34 mm diameter lenses 1161 with stronger containers are being Due to the circumference of the AC ring, the PS production made, and should be tested and ready for the SppS collider run this beam must be merged into one quarter of the PS circumference prior autumn to extraction. Since the end of the ACOL project, three different re- <ombination schemes have been used: Antiproton Collection and Debunching Table I - Different production beams The AC ring [ 171 has achieved and exceeded the design ac- ceptance (AH = 220~ Av = 210~ .Ap/p > 6%). The observed de- population of large betatron amplitudes, was expected to be partly due to non-linear coupling, as already observed in the old AA [18]. Sextupoles were added in 1988 in zero dispersion straight-sections to reduce this coupling [29]. Although these sextupoles were suc- cessful in reducing this coupling, no measurable increase in p yield was obtained since the natural depopulation of large amplitudes in the 200 7c.mm.mrad AC is much more pronounced than in the 100~ mm.mrad AA. The 5 antiproton bunches are injected into 5 buckets of a 09/89-12/X9 1.7~ 1013 30 ns 4 PS RF merging+RF Dipole 6th harmonic RF system [ 191. After one quarter synchrotron period (1.2 MV, 9.5 MHz) rotation in longitudinal phase plane, the voltage All three schemes profit from the upgrade of the PSB en- is quickly reduced to match ihe initially mismatched bunch, and fi- erBy from 800 MeV to 1 GeV [81. nally reduced adiabatically. The debunching performance is expressed as the percentage The first scheme is limited by transverse space charge at of antiprotons found within a 1.5% momentum spread after de- I GeV in the PS; the second one (which fills 112 the PS tine at bunching, relative to the total number injected in the full momentum 1 GeV) in the PSB at 50 MeV, while the third scheme again is spread of 6%. It progressed from 75% early in 1988, to 87% in limited at 1 GeV in the PS although transient beam loading in the PS 1990. Progress is due to the addition of an isoadiabatic interval plays an important role; soon to be improved by a one-turn delay (1988), closed loop control of voltage and phase (1989), and feedback 19,101around the PS RF amplifiers. improved setting-up procedures (1990). 615 Stochastic Cooling adding 2-4 GHz transverse cooling of the core, and, recently a proton stack of 1.67 X lo’* has been obtained with acceptable loss The novel 1-3 GHz AC stochastic cooling system [20,21] rate. Also the stack core momentum svstem (2-4 Gllz) has been in which moving pick-up and kicker electrodes accompany the beam improved by adding a l-2 GHz system. ’ as it shrinks, was very soon identified as a critical item in achieving design performance, even using a 4.8 s cycle instead of a 2.4 s cycle Stark Intensity as originally planned. In 1988 stack intensity was initially limited to about In spite of cold pick-up structures and preamplifiers, the 3X 10” 5 due to a coherent transverse ion-$ qundrupolar instability available powc* (c-10 kW) limits the gain to values below optimum [23,24]. This instability disappeared after improving the electrostatic during most of ttc cycle. Several improvements were introduced clearing and choosing a tune close to 2.25 in both planes. durinc 1988 and 1989: Nevertheless, residual ions caused high loss rates above l Ad 8ed cryogenic cooling of pick-up combiner bo,uds 6~ 101’~dueto excitation of high order non-linear resc)nar,res. This *Periodic filters for betatron systems to increase signal to noise was improved dramatically when the residual ion ncutralizatioll w;is ratio. further reduced by transverse shaking. The record stack intensity of *Two-stage momentum cooling filters. 1 .3X 10’2 5 was obtained with less than 40% stacking efficiency *Dynamic phase correction as function of pick-up and kicker probably due to the limitation mentioned above in the core 4-X GIlz positions. system. After adding the l-2 GHz and 2-4 GHz systems recently *More band III power (2.4-3.0 GIIz). stacking efficiencies above 70 % has been obtained with more than l Better optimized pick-up and kicker movements versus time. 1012i in the stack. The first of these improvements was the most expensive Diagnostics and complex, but also the most effective. By lowering the tempem ture from 100 OK to 30 “K the thermal noise was reduced by 4 dB, These improvements would not be pcls5iblc M lrhutlr and acceptable transverse emittances and efficiency were obtained powerful diagnostic tools and controls software [2.5]: for cxumplc: after 2.4 s. But also the 4.X s cycle was improved (Table 11): *Transverse and longitudinal Schottky scans (tunes vs. freclucncy. emittances vs. frequency, emittances vs. time, etc.). Table II - AC stochastic cooling performance l Real time 5 efficiencies and momentum distribution by I-I-1 spectral analysis of Schottky signals [ 261. *Transverse and longitudinal coherent injection oscillations [27j for almost all injections (including correction matrices): p via loop to AA (L, H, V) - p via loop to AC (L H, V) - $ from target to AC (H.
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