Detector Setup

The Møller polarimeter detector is located in the shielding box downstream of the dipole and consists of two identical modules placed symmetrically about a vertical plane containing the beam axis, thus enabling coincidence measurements. Each part of the detector includes:

• an aperture detector consisting of a 28$\times$4cm$\times$1cm scintillator with Plexiglas light guide and a Philips photomultiplier tube

• 4 blocks of lead glass measuring 30cm$\times$8cm$\times$8cm and Hamamatsu phototubes.

The HV crate is located in the Hall A rack 15. The crate name is hac42. HV for the lead glass detectors is tuned in order to align the Møller peak position at a ADC channel 300 for each module, which means that the gain of the the bottom modules is about 50% higher than the gain of the top modules.

The values of HV are presented in table 2.9.

Table 2.9: HV connections and HV values.

			Voltage (V) for given beam energies (MeV)
slot	#	PMT	845$^{~}$	1645$^{~}$	2445$^{~}$	3245$^{~}$	3334$^{~}$	4252$^{~}$
4	0	LG (L) 1	1974	1896	1851	1819	1817	1790
4	1	LG (L) 2	1914	1835	1791	1759	1757	1730
4	2	LG (L) 3	1909	1842	1803	1775	1773	1750
4	3	LG (L) 4	1870	1806	1770	1744	1742	1720
4	4	LG (R) 5	1903	1814	1762	1727	1724	1694
4	5	LG (R) 6	1897	1824	1781	1751	1749	1724
4	6	LG (R) 7	1934	1843	1790	1754	1751	1720
4	7	LG (R) 8	1935	1865	1824	1797	1794	1770
4	8	Ap scin L	1800	1800	1800	1800	1800	1800
4	9	Ap scin R	1900	1900	1900	1900	1900	1900

In order to obtain the HV values for an arbitrary energy:

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login to adaqs3 as moller;

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$adaqs3>~cd~paw/analysis$, start PAW, select Workstation type 3;

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$paw>~exec~sett\_{}magp~e0=3.2$, the required values of $GL$ or $BdL$ are printed.