Clover detector

Clover detector

Achieve maximum absolute detection efficiency in the full energy range within a limited geometric space

ORTEC at 1970’Started manufacturing and commercializingN type high-purity germanium detector, and in 1990’The first one was launched with fourN type detectorunitary Clover detector. Based on the current N The manufacturing advantages of type detectors,ORTEC Can be used in particle beam, simultaneous additionVarious types of products can be customized according to user requirements for accelerators, astrophysics, health physics and other nuclear physics applications. Clover detector.

Thin contact electrodes on the entire surface and close spacing between detection units（less than 1mm）, guaranteed to be in 20keV-10MeV Within the energy range

Get the best detection efficiency

² Coaxial crystal and short forming time ensure excellent resolution and high peak-to-weight ratio

² Best resistance to neutron damage and quenching recovery ability

² 3 Liter or above quasi-azimuth dewar;(Dewars for fixed orientation can also be customized)

² Vacuum reliability is equivalent to ordinary coaxial detectors;

² Designed for easy maintenance

Clover Each high-purity germanium unit in the detector has two vertical sides and is connected in a consistent arc shape.Made. The four detectors are closely spaced to form a four-page clover（four-leaf clover）shape, conducted by a cold fingerChill.

The neck transition between Cold Finger and Dewar is spaced apart to facilitate assembly BGO detector, made of"Escape Inhibition" The technology detects photons scattered forward. The structure of Cold Finger has been optimized to ensure that in a spherical or flat structure, multiple Clover Detectors can be laid out compactly.

The four detection units have independent electronics so their energy signals are collected separately. In order to correct the energy loss caused by scattered gamma photons, signal integration can be"add-back"(reverse sum)algorithm. Using this algorithm, detection efficiency greater than the simple sum of the signals of four detection units can be obtained.

Clover Detectors can be customized according to the user's specific application requirements. Typically focuses on nuclear physics research at low to medium energiesUsually used 4 a 20%-30%For a relatively efficient detection unit, the corresponding crystal size is approximately 50mm diameter,70mm

Thickness. If you need to pursue greater efficiency and use a larger crystal, you need to also consider that the increase in the distance between the detector and the gamma source caused by the subsequent increase in the diameter of the detector end window will have a negative impact on the actual detection efficiency.

Clover The main significance of the detector lies in the detection of small spaces. Its polycrystalline compact structure can achieve better results than a singleA crystal detector with better efficiency and better array layout. In addition,Clover How the detector can pick up random photonsbit information. In addition, it can effectively reduce the Doppler broadening effect when using single crystal detectors.

Main performance indicators:

² Construction: 4 a N type HpGe detector unit packaged in one

² Relative detection efficiency: from 20~80 optional, all four detectors consistent

² The following indicators are based on four relative detection efficiencies. 25of N type detector for reference:

² energy resolution（Forming time 6µs）:Yes 1.332 MeV Peak:£  2.15keV (typ. <2.0keV)

Yes 122 keV peak:£ 1.05 keV (typ. <1.0keV)

² Energy range: 20keV~10MeV

² Peak Combi: ＞45:1

² Refrigeration: 3L Full range of Wei Dewar (please consult the factory to match other shapes of Dewar or electric refrigeration)

² Play before: 4 preamplifier remote

² Detector interval: The distance between detectors＜1mm。(The distance between the end window and the detector is largesmallDepends on requirementsofThe chamfer angle of the end window and the size of the crystal unit are generally 5mm~30mm）

² End window material: High purity aluminum, other materials can be customized according to user requirements

² Warranty period: 1 Year warranty, which can be extended for a fee

ORTEC Two categories are provided Clover detector. One is relatively standard Clover Detector, its specific sizeThe size can still be adjusted within a small range according to requirements; the other is fully customized according to user requirements. Customizable options include:Tile size, end window material and diameter, end window chamfer angle, package length and neck length, etc.

The picture below is a quan direction 5 Literally standard for Dewar's Clover Detector reference dimensions: