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Soft X-Ray Sources

#A-1617


New Soft X-ray Sources Based on the Diffusive Radiation

Tech Area / Field

  • PHY-PFA/Particles, Fields and Accelerator Physics/Physics
  • PHY-PLS/Plasma Physics/Physics

Status
3 Approved without Funding

Registration date
11.03.2008

Leading Institute
A.I. Alikhanyan National Science Laboratory, Armenia, Yerevan

Supporting institutes

  • Tomsk Polytechnical University, Russia, Tomsk reg., Tomsk

Collaborators

  • Thomas Jefferson National Accelerator Facility, USA, VA, Newport News\nFOM-Institute for Atomic and Molecular Physics(AMOLF), The Netherlands, Amsterdam\nThe University of Warwick / Centre for Scientific Computing, UK, Coventry\nUniversity of British Columbia / Department of Chemistry, Canada, BC, Vancouver

Project summary

Diffusive Radiation (DR) is originated by the passage of electrons through randomly inhomogeneous media. This radiation was predicted theoretically [1, 2] and recently has been observed experimentally [3]. Within the completed ISTC project A-655 we created an experimental setup on which DR in the optical region has been observed [3]. The main goal of the present project is observation of DR in EUV and soft X-ray regions. For this purpose we plan to use electron accelerators with energy 2-10 MeV and random nanoscale multilayered structures Be/Si, Be/Ti and etc. as targets. The DR intensity resonantly enhances [3, 4] provided that Cherenkov condition for the average dielectric constant of the medium is fulfilled. Choice of Si, Ti is stipulated by the possibility to fulfill the resonant condition for the frequencies close to the absorption edges mentioned elements in soft X-rays. The choice of light element Be in the structure is conditioned by the weak absorption in the mentioned soft X-region close to the absorption edges of Si and Ti.

We plan to create two new experimental setups: one on the base of linear accelerator LAE-10 in Yerevan and another on the base of microtron M-5 in Tomsk. Studies of X-ray characteristics in the soft range (25-2000) eV will be performed by the use of X-ray spectrometer-monochromator XRSM-500 with relative energy resolution of about 0.001. The authors of the project have X-ray spectrometer XRSM-500, which is placed in the channel of outgoing electron beam from the 5.7 MeV microtron [5].

The experimental observation of DR in soft X-rays allow to develop laboratory-sized sources based on DR. The main shortage of Cherenkov radiation based UV and soft X-ray sources [6] is the insufficiency of emitted electrons. Our preliminary estimations show that DR can ensure more photon yield than Cherenkov radiation. The X-ray sources based on compact electron accelerators are defined as alternatives to more complicated and expensive sources of synchrotron radiation and can be used in medicine and industry.

It is known that optical transition radiation is used for electron beam diagnostics [7]. The beam diagnostics based on the optical transition radiation is restricted by the space resolution of beam size of the order 1μm due to diffraction limit. However for the linear colliders or X-ray free electron lasers submicron resolution is necessary. We plan to achieve such a resolution using emission of DR soft X-ray photons from the beams.

References

  1. S.R.Atayan and Zh.S.Gevorkian, Sov.Phys.JETP, 98, 1539,(1990).
  2. Zh.S.Gevorkian, Phys.Rev.E 57,2338, (1998); Zh.S.Gevorkian and et al, Phys.Rev.Lett. 86, 3324,(2001).
  3. Zh.S.Gevorkian and et al, Phys. Rev.Lett, 97,044801 (2006).
  4. Zh.S.Gevorkian and J.Verhoeven, NIM B, 252, 57 (2006)
  5. A.V.Kozhevnikov, A.F.Medvedev, M.M.Nikitin, N.A.Timchenko, V.E.Epp, Izvestiya Vuzov Fizika(in Russian), 45,46,(2002).
  6. W.Knulst and et al, Appl.Phys.Lett. 79, 2999, (2001); ibid 83, 4050, (2003).
  7. A.N.Aleinik, O.V.Chefonov, B.N.Kalinin, G.A.Naumenko, A.P.Potylitsin, G.A.Saruev, A.F.Sharafutdinov, W.Wagner, NIM B201, 34,(2001).


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