Polarized Target Specifications



Magnet Specifications

Superconducting Magnet

Oxford Instruments
Split pair Helmholtz coil
20 cm bore and a 10 cm split

Along the split the magnet coils formed an opening cone of 100 degrees Along the split the magnet has an opening angle of plus/minus 25 degrees in the vertical and plus/minus 17 degrees in the horizontal.

Cryostat volumes

LHe 85 liters
LN2 57 liters
In E143
Field 4.872 Tesla
Current 75.33

Shims
Z0 = 0 (NA)
Z1= 0
Z2 = 0.78


Refrigerator Specifications

Cooling Power 1.3 W
Base Temperature 0.94K
(1 watt at 1K requires 7000 m3/hr)
Magnet cryostat volume
LHe: 85 liters
LN2: 57 liters

Pumps
12000 m3/hr Balzers followed by an Alcatel set consisting of two blowers, a 3000 m3/hr, a 1000 m3/hr. Last stage consisted of 3 mechanical pumps each of capacity 60 m3/hr.

Helium consumption
7 -9 l/hr with earthquake bracing

Magnet should be less 1 l/hr
(15 SLM (vapor) = 1 l/hr liquid)
Separator ran at ~20 SLM
Refrigerator ran at 15 -20 SLM


Microwave Specifications

Tube

Varian VKT 2438 series CW EIO
Oldest Tube with central frequency 136.5 GHz
20 Watts

Power Supply

Frequency Modulation

Function generator ( 1kHz sawtooth) to audio amplifier to the primary of a isolation transformer. Secondary was HV from Varian supply.
100 volts peak to peak generated 80V on HV -> generated plus/minus 250 MHz modulation

Circuit

Gold Plated Waveguide in Insert ­ 70/30 CuproNickel, 70 GHz, Circular Goldplated Waveguide
Good Frequencies at 4.8742 Tesla

NH3+ 136.500 136.430
NH3- 136.900 136.850
ND3+ 136.550 136.470
ND3- 136.830 136.856


Insert Specifications


Donal Day, University of Virginia