FLOPS - A long pulse, high current, spallation source proposal
FLOPS - A long pulse, high current, spallation source proposal
FLOPS - A long pulse, high current, spallation source proposal
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<strong>FLOPS</strong><br />
A <strong>long</strong> <strong>pulse</strong>, <strong>high</strong> <strong>current</strong>, <strong>spallation</strong> <strong>source</strong> <strong>proposal</strong><br />
Anirban Bhattacharyya (CERN)<br />
Nikolaj Zangenberg (Danish Technological Institute)<br />
R. Barlow (Cockcroft Institute)<br />
Ulrich Dorda (CERN/ MedAustron)<br />
Bilbao, Spain, 31.05.2011
1 The objective<br />
2 Selection criteria<br />
3 Alternatives<br />
4 The <strong>proposal</strong><br />
OUTLINE<br />
CAS - Bilbao- <strong>FLOPS</strong> 2 / 16
The objective<br />
What?
CAS - project design # 2<br />
Task<br />
Green field accelerator design<br />
Pulse length: 2 - 3 ms<br />
Repetition rate: 10 - 20 Hz<br />
P ≈ 5 MW<br />
1 - 8 GeV - Our Decision: 1 GeV<br />
Particle type: p or H −<br />
CAS - Bilbao- <strong>FLOPS</strong> 4 / 16
Selection criteria<br />
Decision helpers
Fulfills specs<br />
Selection criteria<br />
Maturity of technology vs. technology pioneering<br />
Cost of installation<br />
Cost of operation<br />
◮ Electric power<br />
◮ Spare part<br />
◮ Man power<br />
Geometric footprint<br />
Simplicity & Reliability<br />
Flexibility/ Upgradeability<br />
CAS - Bilbao- <strong>FLOPS</strong> 6 / 16
Alternatives<br />
Just in case you don’t like our real <strong>proposal</strong>
Stacked<br />
800MeV, 2mA per ring,<br />
superconducting, Peter McIntyre<br />
and Akhdior Sattarov<br />
p and H − in same cyclotron?<br />
Cyclotron<br />
Staged<br />
CAS - Bilbao- <strong>FLOPS</strong> 8 / 16<br />
1GeV, 5mA, P.Mandrillon,<br />
N.Fietier, C.Rubbia
first more reasonable <strong>proposal</strong><br />
ESS concept:<br />
Alternative concept:<br />
p + <strong>source</strong><br />
H - <strong>source</strong><br />
CAS - Bilbao- <strong>FLOPS</strong> 9 / 16<br />
”bypass”<br />
Storage ring<br />
1.1 GeV (Ø80m)<br />
target
first more reasonable <strong>proposal</strong> - Detail<br />
Linac at same time p and H − in case of bypass<br />
storage ring with permanent magnets l ≈ 80 m<br />
horizontal + vertical mti for protons and H- from opposite side<br />
coasting beam (no <strong>long</strong>itudinal and reduced transverse space<br />
charge)<br />
no ramping/ timing - relaxed control system<br />
Slow 3 rd order resonant extraction<br />
Laser stripping needed as foil would blow up the circulating beam<br />
CAS - Bilbao- <strong>FLOPS</strong> 10 / 16
The <strong>proposal</strong><br />
For your consideration
Linac into FFAG<br />
FFAG = accelerator + storage ring!<br />
+ transversal phasespace painting<br />
<strong>FLOPS</strong> = Ffag LOng Puls Source<br />
CAS - Bilbao- <strong>FLOPS</strong> 12 / 16
Some sketch of the idea<br />
CAS - Bilbao- <strong>FLOPS</strong> 13 / 16
U<br />
1.0<br />
0.5<br />
0.0<br />
−0.5<br />
−1.0<br />
Injection energy<br />
−2 −1 0 1 2<br />
t<br />
Assume Linac RF: 352.2MHz<br />
1 GeV in 80m ring: 0.3µs<br />
Allow RF phase change of 10% → ∆trev = 0.3 ns →<br />
Einj = 998.5MeV<br />
Little energy variation → “simple” FFAG magnets<br />
CAS - Bilbao- <strong>FLOPS</strong> 14 / 16
Slow resonant extraction<br />
Extraction<br />
“slow” acceleration via RF noise using the existing cavities<br />
(somehow like a synchro-cyclotron)<br />
Option to make short <strong>pulse</strong> by including a kicker<br />
CAS - Bilbao- <strong>FLOPS</strong> 15 / 16
Summary<br />
Linac is the most conventional, reliable option (dual particle<br />
option?)<br />
Many other unconventional ways (like the Linac-FFAG<br />
combination) still requiring theoretical beam physics<br />
considerations → well suited for CAS brain-pool discussions.<br />
CAS - Bilbao- <strong>FLOPS</strong> 16 / 16
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