Particles and Universe: Particle accelerators
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1 Particles and Universe: Particle accelerators Maria Krawczyk, Aleksander Filip Żarnecki March 24, 2015 M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
2 Lecture 4 1 Introduction 2 Electrostatic accelerators 3 Linear accelerators 4 Circular accelerators 5 Focusing 6 Colliders 7 Future projects M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
3 Introduction Natural radioactivity Discovered by Henri Becquerel in Nobel prize for H.Becquerel, M.Sklodowska-Curie and P.Curie in M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
4 Introduction Natural radioactivity Discovered by Henri Becquerel in Nobel prize for H.Becquerel, M.Sklodowska-Curie and P.Curie in Three types of radiation were recognized, based on penetration of matter and bending in the magnetic field: α, β, γ. Radioactivity described as transformation of elements. Atoms considered elementary at the begining... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
5 Introduction Natural radioactivity Discovered by Henri Becquerel in Nobel prize for H.Becquerel, M.Sklodowska-Curie and P.Curie in Three types of radiation were recognized, based on penetration of matter and bending in the magnetic field: α, β, γ. Radioactivity described as transformation of elements. Atoms considered elementary at the begining... Strong radioactive sources became one of main tools in research. Spectacular discoveries: nucleus, proton, neutron. But energies up to about 50 MeV could only be obtained... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
6 Introduction Cosmic rays Discovered by Victor Hess in M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
7 Introduction Cosmic rays Discovered by Victor Hess in Main tool for discoveries in 1930s 1950s. Discoveries of positron, muon, pion, kaon. Applications limited by small intensity, decreasing fast with energy... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
8 Introduction Primary cosmic rays Observed in the cosmic space, outside Earth s atmosphere Composition: protons ( 1 H) 86% α particles ( 4 He) 13% heavier nuclei 1% neutrons, electrons, photons 1% (neglecting neutrinos and CMB) Same as the composition of the Universe... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
9 Introduction Primary cosmic rays Super-Nova Remnants are good candidates for CR sources: observed galactic rate: one per years. explosion releases J about 10% transferred to CRs shock-wave in the inter-stellar medium can explain the observed energy dependence can accelerate up to ev High energy gamma radiation from RXJ1713, as seen by HESS. M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
10 Introduction Secondary cosmic rays Result of the primary cosmic ray interactions in the Earth s atmosphere. Secondary particles, mainly pions and kaons, are copiously produced in these interactions. Both pions and kaons are unstable, produced in their decay chain are muons and electrons. At the sea level: muons µ ± 70% electrons e ± 25% protons and pions π ± 3% Average flux: 180 particles per m 2 s Without neutrinos... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
11 Introduction Scientific discoveries were possible thanks to new research tools electron 1911 atomic nucleus cloud chamber 1919 protonu 1929 Van der Graaff accelerator 1931 neutron Lawrence cyclotron 1932 positron Cockcroft-Walton generator 1937 muon µ ± 1947 pion π ± 1949 kaon K ± 1952 bubble chamber 1955 synchrotron dawn of modern particle physics M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
12 Accelerators Electrostatic accelerators E.Rutherford was the first to point out the advantages of particle acceleration (1919). Charged particles (and nuclei) can be easily accelerated with strong electric field. q>0 U + E Higher energies require higher voltages! New devices developed to obtain high accelerating voltages: Cockroft-Walton generator (1932): 750 kv Van de Graaff generator (1931): 1.5 MV E = E + U q Still used in some specific applications... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
13 Accelerators Cockroft-Walton generator Principle H source for CERN proton liniac M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
14 Accelerators Van de Graaff generator Principle History Modern devices M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
15 Accelerators Van de Graaff generator Tandem generator for ion acceleration: AGS Complex at BNL: Emax = 29 MeV (p); 385 MeV (U) M.Krawczyk, A.F.Z arnecki Particles and Universe 4 March 24, / 37
16 Accelerators Linear accelerator First idea: Gustav Ising Proof of concept: Rolf Wideroe 1927, accelerated potassium ions to 50kV with 25kV oscillator Use oscillating voltage source. q>0 E U With proper frequency and gap widths setting particle passes same accelerating voltage many times. Energy multiplication. M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
17 Accelerators Linear accelerator First idea: Gustav Ising Proof of concept: Rolf Wideroe 1927, accelerated potassium ions to 50kV with 25kV oscillator Use oscillating voltage source. With proper frequency and gap widths setting particle passes same accelerating voltage many times. Energy multiplication. M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
18 Accelerators Linear accelerator First idea: Gustav Ising Proof of concept: Rolf Wideroe 1927, accelerated potassium ions to 50kV with 25kV oscillator Use oscillating voltage source. With proper frequency and gap widths setting particle passes same accelerating voltage many times. Energy multiplication. In the modern design accelerating tubes act as high frequency resonators. Pre-accelerators for most accelerators are build that way... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
19 Accelerators Linear proton (pre)accelerators: Fermilab CERN M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
20 Accelerators Accelerating cavity In the high energy limit, when the particle travels with (approximately) speed of light, it is easier to generate standing electromagnetic wave in a dedicated cavity powered by a klystron. Klistron M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
21 Accelerators Accelerating cavity In the high energy limit, when the particle travels with (approximately) speed of light, it is easier to generate standing electromagnetic wave in a dedicated cavity powered by a klystron. Klistron Frequencies used range from about 100 MHz to 10 GHz. Superconducting cavities can give gradients up to about 30 MV/m. Very efficient acceleration, but the total length increases with energy... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
22 Accelerating cavity M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
23 Accelerators Cyclotron To reduce the accelerator size we have to force the particle to pass the same accelerating gap many times. Magnetic field can be used for that... First device of this type was built by Ernest Lawrence in 1931: M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
24 Accelerators Cyclotron In few years cyclotrons became a very powerful tool in particle research. Berkeley m diameter The largest single magnet cyclotron: 4.6 m in diameter 730 MeV (p). M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
25 Accelerators Synchrotron Invention of synchrotron (1945) was the next major breakthrough. Large magnets and vacuum chambers not needed any more. Dipol magnet field changing with energy keeps particles on the fixed orbit. M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
26 Accelerators Focusing Dipol magnets allow to keep accelerated particles on the circular orbit. However, the due to the increasing beam spread (both in space and momentum) efficiency of acceleration was low. M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
27 Accelerators Focusing Dipol magnets allow to keep accelerated particles on the circular orbit. However, the due to the increasing beam spread (both in space and momentum) efficiency of acceleration was low. Quadrupol magnets focus particle beam, buy only in one direction. Simultaneous beam focusing in two directions is impossible. M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
28 Accelerators Focusing Dipol magnets allow to keep accelerated particles on the circular orbit. However, the due to the increasing beam spread (both in space and momentum) efficiency of acceleration was low. Quadrupol magnets focus particle beam, buy only in one direction. Simultaneous beam focusing in two directions is impossible. M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
29 Accelerators Strong focusing Developed at BNL in 1952 New accelerators: 1959 CERN (25 GeV), 1960 BNL (33 GeV) M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
30 Accelerators Structure Modern circular accelerators are built from many (almost) identical segments. Each segment includes three types of structures: bending magnets (B) focusing magnets (F) accelerating cavities (A) F A B M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
31 HERA ( ) tunnel M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
32 LHC arc lattice M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
33 Colliders First e + e collider M.Krawczyk, A.F.Z arnecki Frascati (1961) Particles and Universe 4 March 24, / 37
34 Colliders Most of the high energy frontier accelerators work in the collider mode. Two beams are accelerated and stored in the ring, circulating in opposite directions. They can collide (almost) head-on in few crossing points. The primary advantage is the increase of the center of mass energy: E = 2 E beam for beam-beam collisions E = 2 E beam m for beam-target collisions M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
35 Colliders Most of the high energy frontier accelerators work in the collider mode. Two beams are accelerated and stored in the ring, circulating in opposite directions. They can collide (almost) head-on in few crossing points. The primary advantage is the increase of the center of mass energy: E = 2 E beam for beam-beam collisions E = 2 E beam m for beam-target collisions The price is the collision rate. Probability of particle collision per beam crossing is very low ( at LHC), we need high beam intensities. For fixed target experiments it is 0(1), we can get much higher rates... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
36 Colliders History Rapid development of the particle physics was thanks to many new accelerators built in 1970s 1990s. Energies increased by almost 3 orders of magnitude. Unfortunately, sizes and costs of new machines increased rapidly as well... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
37 Colliders LEP LEP was the largest accelerator built so far, its circumference was 27 km. Collided e + e at CMS energies up to 209 GeV. LHC Installed in the same tunnel after LEP. Two beams with 2800 bunches each, protons per bunch. Nominal beam energy: 7 TeV. Bunch crossing every 25 ns. Single bunch energy: 10 5 J Total energy: J M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
38 CERN, Geneva M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
39 LHC tunnel M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
40 LHC accelerator complex M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
41 Colliders Limitations To get higher beam energies we need to built bigger and bigger ( more expensive) accelerators Why? What limits the energy, which can be achieved? M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
42 Colliders Limitations To get higher beam energies we need to built bigger and bigger ( more expensive) accelerators Why? What limits the energy, which can be achieved? For circular proton accelerators magnetic field. Magnetic field has to rise with increasing beam energy to keep protons inside the accelerator pipe. M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
43 Colliders Limitations To get higher beam energies we need to built bigger and bigger ( more expensive) accelerators Why? What limits the energy, which can be achieved? For circular proton accelerators magnetic field. Magnetic field has to rise with increasing beam energy to keep protons inside the accelerator pipe. But we face the fundamental limit: critical magnetic field of superconductors. We can only build (on industrial level) magnets up to 10 T. we have to increase bending radius to increase energy... M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
44 Colliders Limitations To get higher beam energies we need to built bigger and bigger ( more expensive) accelerators Why? What limits the energy, which can be achieved? For circular e + e colliders synchrotron radiation. Circulating electrons loose energy due to synchrotron radiation. Power of energy losses increases as E 4 /R 2 M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
45 Colliders Limitations To get higher beam energies we need to built bigger and bigger ( more expensive) accelerators Why? What limits the energy, which can be achieved? For circular e + e colliders synchrotron radiation. Circulating electrons loose energy due to synchrotron radiation. Power of energy losses increases as E 4 /R 2 We have to compensate the losses with accelerating cavities. Accelerating gradient limited need larger accelerator to add more cavities. For larger bending radius we also reduce synchrotron radiation. M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
46 Future projects ILC Synchrotoron radiation is no longer a problem for linear accelerators. Detailed design of the International Linear Collider is ready. Decision expected in Could be built in Japan before M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
47 Future projects CLIC Energy available at linear colliders is limited by accelerating gradient. Superconducting cavities powered by klystrons can give up to 30 MV/m. Higher gradients expected in cavities powered with high intensity beams. Project being developed at CERN. Timescale: M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
48 Future projects CLIC Test beam at CERN M.Krawczyk, A.F.Żarnecki Particles and Universe 4 March 24, / 37
49 Future projects Considered options for building the next circular proton collider after LHC. FCC (CERN) CCC (China) 2025 (e + e, 2035 (pp) 2040?... In the first phase, e + e machine could be installed Higgs factory M.Krawczyk, A.F.Z arnecki Particles and Universe 4 March 24, / 37
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