Determination of the H1-Solenoidfield

 

 

 

Boundary conditions and requirements

 

Magnetic field of solenoid

1.14T (homogenous in z-direction), DC

Temperature range

10oC - 50 oC

Accuracy

0.5% -> 5mT / 4 ½ digits

Distance between sensor and Gausmeter

30 – 35m (will be proved)

Distance between sensor and preamplifier

5m

Local dependence

2-dim Independence of orientation

Maximal size of the sensor (h x b x l)

13 x 16 x 240 and 10 x 21 x 142 [mm]

Sensor

Radiation resistant

Maximal radiation

10Mrad (calculated for 10Years)

Cable

Radiation resistant, halogen free material

Sensor type

Axial

Weight

-

Output

RS232

Housing of the probe

Non magnetic material

Orientation of the field

N-pole right / S-pole left

Principle of measurement

Hall

 

 

The sensor is positioned in the H1 Detector at z = -1700mm (on the top of the beampipe).

 

 

 

Advantage and disadvantage of different principle

 

NMR-sensor:

Advantages: Temperature independence, high accuracy (10-5), resistant against small orientation effects (volume probe)

Disadvantage: expensive, sensible against vibration, non uniform field measurements, AC-fields, one probe is only for a small field range, resistant against radiation (Lake shore)

 

Hall-sensor:

Advantages: cheep, very small vibration effects, small probes, non uniform field measurements, AC-field measurements possible, wide range of field value can be covered by one probe

Disadvantage: Temperature dependence, sensible of orientation, accuracy (10-3)

 

 

 

 

Test of the existing NMR-Gausmeter

Test of the electrical unit with a 0.4T-permanent magnet (MTH). The existing sensors were positioned on the top of the CJC.