Internal Temperature test

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User name Chiranjib

Log entry time 01:08:27 on November 21, 2008

Entry number 250118

keyword=Internal Temperature test

Yi and I performed a test yesterday. Its just a late entry.

Temperature Test on Cell ASTRAL for vertical pumping

Laser Status	NMR signal(mV)	RTD P1	RTD P2	RTD1	RTD2	RTD3	RTD4	RTD5
ON	21.47	247.676	246.27	38.6328	71.1133	137.598	60.9668	37.5781
OFF	20.95	224.004	220.547	38.6523	134.736	60.8887	60.8887	37.7051
ON	20.57	248.437	247.559	38.623	69.7559	140.02	61.5918	38.291

COMMENTS
The test is performed with a WAIT TIME of 20 min between two successive NMR(4 AFPs) measurements.RTDP1 and RTDP2 refer to the two RTD readouts from the pumping chamber surface.I will follow up with the temperature calculation closely later. But from my small simulation earlier, its seen that even with a difference of 50 degree C in the pumping chamber, the change in the polarization is not more than 2%.So our present polarization number with this temperature is good enough for the time being to make an estimation already as far as the temperature dependence is concerned. Of course here I assume that the target chamber temperature ( " the average target chamber temperature") stays almost constant and it is actually constant.