Seminar 26th April - John Singleton, BigLight

Tallahassee, NHMFL - National High Magnetic Field Laboratory
3 sites in the USA
3 FELs - NIR, MIR, FIR. NIR could operate simultaneously with MIR, but maybe with less power. NIR is upstream of MIR. Swept-frequency operation would be difficult, but there is not much demand, so will just do spot measurements
Coherent Undulator for Terahertz Spectroscopy (CUFT)

Draft design of light source overseen by George Neil.

USD2.5M
1. Design of user facility ('co-location')
2. Research into pulse manipulation using electrostatic accelerator

Parameters:
Injector/dump 10 MeV - thermionic gun
Linac 60 MeV
1m to 1mm wavelengths, plus THz
3 or 4 wigglers - rapid tunability, well-defined polarisation states
Current? 1mA, peak 45A
Bunch repetition rate? Variable bunch trains. 0.5 to 20 ps bunch length, 11.8 MHz repetition rate either pulsed or CW, 0.3% energy spread
1.3 GHZ RF
Emittance 20 mm-mrad
10-20 fs timing jitter - how is it used? (ask George Neil)

NIR lt 60 MeV 1.6 kW
MIR lt 30 MeV 700 W (will actually be 60 MeV because FELs using same electron bunches simultaneously)
FIR 7-10 MeV 300W

Interest is in use of FEL light in combination with high magnetic fields. Fields up to 180 Tesla available at LANL!! (pulsed)

LANL - 65/90 T pulsed fields available to users.
FSU site - 45 T DC field available to users (wow). 2 more magnets 25-30 T and 36 T (so-called series connected design which makes operation and interlocks simpler).
(need to watch out where you site the accelerator, and use passive shielding to reduce the stray fields from the DC magnets).

Experimental need - 1ps, pump-probe, THz to near-IR.

Timeline (hoped)
2008 funding (NSF only) - about 25-30M (not including staff or building)
2012 completion
Detail design - 2008/2009 (15 staff-years).
Make some of it? (injector for 2010)
Collaborate in cryomodule production?