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NMR system for the frozen spin target to measure the polarisation

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Presentation on theme: "NMR system for the frozen spin target to measure the polarisation"— Presentation transcript:

1 NMR system for the frozen spin target to measure the polarisation
CB collaboration meeting University of Edinburgh 2009 Nadja Frömmgen Institut für Kernphysik Universität Mainz Nadja Frömmgen

2 Outline Principle of NMR Detection of the NMR signal NMR signal
Performance test in July 2009 Conclusion and Outlook Nadja Frömmgen

3 Principle of NMR Irradiation with a HF field
NMR signal results from the difference between absorbed and emitted energy; voltage is induced in a receiver coil Signal is proportional to the population difference Polarisation Nadja Frömmgen

4 coil Nadja Frömmgen

5 How is the NMR signal detected?
Series LC resonant circuit Nadja Frömmgen

6 Series LC resonant circuit
Resonance frequency tuning to the Larmor frequency of nucleus via changing C (varicap) „Resonance parabola“ Nadja Frömmgen

7 Q-curve of the resonant circuit
Nadja Frömmgen

8 NMR signal TE: thermal equilibrium
Measurement of the TE signal as exactly as possible to minimise the error of the polarisation measurement. Nadja Frömmgen

9 July 2009 Performance test: cryostat, microwave apparatus & NMR system
polarising magnet: T cooled to ~26mK irradiated with microwaves (15mW) for 3.5 hours up to ~50% polarisation Successfull measurement: TE signal Polarised NMR signal Polarisation curve Relaxation curve Nadja Frömmgen

10 TE-Signal In the meantime the noise on the signal could be reduced.
Nadja Frömmgen

11 Polarised NMR Signal ~ 50% polarisation Nadja Frömmgen

12 Polarisation curve Polarisation [%] 2 ¼ hours Nadja Frömmgen

13 Relaxation curve Polarisation [%] 30 minutes Nadja Frömmgen

14 Conclusion and Outlook
NMR-System is working well we expect a polarisation of P>90% and an error in the polarisation measurement of ~1.5% system linearity measurement several stability tests optimisation of the software by M. Korolija from Zagreb final test of the frozen spin target in October together with J. Usov, A. Neganov, N. Borisov and A. Lazarev from Dubna Nadja Frömmgen

15 Thank you for your attention!
Nadja Frömmgen

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