1. How can we restart AD in 2006 ? Tommy Eriksson AB/OP/AD  
13 January PS&SPS DAYS
How can we restart AD in 2006?

2. How can we restart AD in 2006 ? How could AD be run in 2006?
Contents
How could AD be run in 2006?
Consolidation needed for a successful restart
Improvements
ccc issues
13 January PS&SPS DAYS
How can we restart AD in 2006?

3. How could AD be run in 2006?
The SPSC at Villars strongly supports continued operation of the AD……
“Crystal ball exercise”: Short AD run May-August, 1800 total runtime (3400 in 2004)
OP/AD-LEIR section will run either AD or LEIR, including LEIR commissioning 2005/2006
AD: ops crew = 5 specialists on-call Mon 07:00 – Fri 23:00 24h/24. Shiftwork on AD only during startups and md:s.
13 January PS&SPS DAYS
How can we restart AD in 2006?

4. Consolidation needed for a successful restart in 2006
AD is based on ACOL, built in 1986
Running for physics since 1999
Uptime has been around 85-90%, except for 2004 when it went down to 71%
We are looking at years of continued operation
Plans for a future Pbar facility at GSI exist, to be operational after 2013
13 January PS&SPS DAYS
How can we restart AD in 2006?

5. Consolidation - electron cooling
13 January PS&SPS DAYS
How can we restart AD in 2006?

6. Consolidation - electron cooling
Replacement of NEG:s, add “missing” NEG
Repair of orbit pickup
New V coils+supplies on DHV2904 and 2917,
study underway
Replacement of cathode
Alignment
New interlock system (standardisation)
13 January PS&SPS DAYS
How can we restart AD in 2006?

7. Consolidation – stochastic cooling
13 January PS&SPS DAYS
How can we restart AD in 2006?

8. Consolidation - stochastic cooling
Amplifier maintenance, asssuming present failure rate
Programmable delays/attenuators controls: eliminate CAMAC, new interface, supplies etc.
Instrumentation
P/U+kicker movement outdated, but redundant equipment can be used.
Document + cleanup PFF
13 January PS&SPS DAYS
How can we restart AD in 2006?

9. Consolidation – vacuum system
Open sect. 3+4:
Electron cooler work
Remove kicker tank in sect. 35, replace w. tube
Install non-magnetic support VVS3105
Replace BIPM4208 MCP
Bakeout required
Isolate AD from TTL2 (close 8000-line)
Improve DEM.STP18
Cryogenics compressors
Pumping groups, VGI:s
Ion pump supplies upgrade. (part of on-going PS-wide standardisation)
13 January PS&SPS DAYS
How can we restart AD in 2006?

10. Consolidation – vacuum system
13 January PS&SPS DAYS
How can we restart AD in 2006?

11. Consolidation – experimental zone
Install new H+V corrector and in DE0 beneath ATRAP2 (main solenoid stray field compensation)
13 January PS&SPS DAYS
How can we restart AD in 2006?

12. Consolidation – kickers
K35 tank will be taken out – no longer in use, reduce leak risk during bakeouts, source for spare parts
K55/56 tanks not suitable for bakeout, leaks have occurred
(Decision to be taken)
Electronics – covered under general consolidation program
13 January PS&SPS DAYS
How can we restart AD in 2006?

13. Consolidation – power converters
Pulsed capacitor discharge supplies (injection line + septas). Replacement of all capacitors + some electronics/switches
For extended AD run period, new supplies could be considered
13 January PS&SPS DAYS
How can we restart AD in 2006?

14. Consolidation – RF
C02: spare situation generally ok, but some new spares needed (gap capacitors, tuning current transistor banks)
C10 (minimum): 2 Final tubes
C10 (for extended AD run period):
Modernisation of several supplies/drivers
Beam control: Startup as-is (upgrade in 2007/8 to DSP-based standard system)
Instrumentation
13 January PS&SPS DAYS
How can we restart AD in 2006?

15. Consolidation – Target area
Spare situation ok except for BHZ6024/6025, no spare and the manufacturer does not exist any more……
Horn pulser: PLC-based controls
Horn pulser ignitron upgrade (safety issue):
Replace mercury switches by thyristors (under consideration)
13 January PS&SPS DAYS
How can we restart AD in 2006?

16. Consolidation – Instrumentation
New electrostatic pickups for ejection lines
(non-destructive beamline tuning)
New type MWPC:s + improved ctrls
MTV:s, new cameras/hw
13 January PS&SPS DAYS
How can we restart AD in 2006?

17. Consolidation – Infrastructure
Water distribution 7000-line
Water cooling installation recently overhauled
No main worries for B.193
13 January PS&SPS DAYS
How can we restart AD in 2006?

18. Improvements
The SPSC recommends the implementation of a faster switching between the AD experiments
Needs more stable machine…..
New corrector dipoles for e-/pbar trajectory alignment in ecooler: reduction of realignments
Ejection ppm looks possible (requested by some AD users) – studies will be made in 2005/6
Use of electrostatic pickups in the ejection lines would greatly speed-up beamline tuning
13 January PS&SPS DAYS
How can we restart AD in 2006?

19. Improvements
At Villars the SPSC has also supported the implementation of the ELENA decelerator ring
Further deceleration from 5.3 MeV to 100keV will increase pbar trapping efficiency
New electrostatic beamlines
Cost study needs to be done
13 January PS&SPS DAYS
How can we restart AD in 2006?

20. Improvements Increase beam intensity:
Stacking in AD, proof of principle made, needs work in PS/RF + AD hall radiation considerations
5-bunch production beam instead of 4, need 3.6 s PS cycle with injection twice from PSB
13 January PS&SPS DAYS
How can we restart AD in 2006?

21. CCC issues Running AD from ccc reinforces the need for:
Improved machine stability =
Need improved correction of ecool trajectories
Better tools for ejection beamline tuning =
Need pickups for fast, non-destructive corrections
13 January PS&SPS DAYS
How can we restart AD in 2006?