Status of MAX-lab, Storage Rings

1. Status of MAX-lab, Storage Rings Presented at ESLS XVI, 2008 by Mikael Eriksson

2. MAX-lab accelerators MAX I, 0.55 GeV MAX III, 0.7 GeV Linac injector 0.4 GeV Nucl Phys, cont beam MAX II, 1.5 GeV MAX-FEL

3. Operational status of the rings • The rings are operated 5000-6000 hours/year • They are filled to some 250 mA and filled when the current decayed to some 100 mA • The MAX-injector behaves very well, the energy is being increased from 400 to 450 MeV. Used as injector for the 3 rings, MAX-FEL and gun tests. Overbooked. • Beam-lines at MAX I are upgraded and transfered to MAX III. Time for Nucl Phys at MAX I increasing. MAX I performance as SR decreasing. • The MAX II ring is running at its maximum performance. No upgrades planned. Commissioning of the 100 MHz RF system has been painfull, but that’s done now. • The MAX III ring gives up to a factor of 100 higher performance than MAX I. (UV and IR activity) • We suffer from low-energy injection. • All parts for the MAX-FEL are there, we are trying to lase (some minor parts for synchronisation remain).

4. Status os some peculiarities at MAX-lab (1): Solid iron blocks housing several magnets housing different multipoles. (MAX III cells). (MAX IV protos) Works as expeted

5. Status of some peculiarities at MAX-lab (2): Recirculated linacs Recirculation + SLED => 4xMEV/Euro

6. Status of some peculiarities at MAX-lab (3): Solid iron blocks housing several magnets with different multipoles. (Recirculator isochronous and non-dispersive 1800 bends). Works as expected

7. Status of some peculiarities at MAX-lab (4): 100 MHz, capacity-loaded cavities • Advantages: • Commercial FM-transmitters as RF-sources • Long bunches favour CB and resistive wall stability • Only low RF voltage needed for high bucket height • Warm Landau-cavities possible • HOM-damping simple • Disadvanges: • Long bunches don’t allow for time-resolved experiments • Development work substantial • Circulators not trivial • Lower shunt impedance/unit length than 500 MHz

8. Status of some peculiarities at MAX-lab (5): NEG-coated dip vac chambers (MAX IV protos) Standard MAX II dipole chamber made of stainless steel. NEG coated dipole chamber of Cu installed in MAX II. Seems to work as predicted, not yet fully verified

9. MAX IV – Swedish / Nordic / Baltic SR facility Phase 1: 3 SR rings to cover a broad spectral range with optimized undulators Injector linac =>short X-ray pulses Phase 2: FEL 3 GeV ring 0.24 nmrad 20 straights 1-1.5 GeV ring Upgraded MAX II 0.7 GeV ring MAX III 3 GeV linac Injection + Short Pulse Facility

10. => Low magnet weight, rigid mounting favours high eigenfrequencies Light magnets Concrete

11. Status MAX IV • All evaluations finished, gone well. • Construction recommended in the governements research bill of Nov. 2008. Funding should be raised within the existing and added funds. • The Governement allocates a negotiator to present the funding profile. (Res. Councils, private foundations, universities, industry, Nordic and Baltic countries) • Funding level being discussed at Res Council, Private foundation etc. • Region Skane offers to guarantee the building cost (40% of capital cost) (Nov 2008)

12. END