ANASEN
Array for Nuclear Astrophysics and Structure with Exotic Nuclei (ANASEN) is an active target detector. FSU, LSU, and TAM are joined in the development of the project.
First Generation
NIM paper : https://doi.org/10.1016/j.nima.2017.07.030 PRC paper : https://doi.org/10.1103/PhysRevC.105.055806
Second Generation
The main difference from the 1st generation is the Twisted Anode and Cathode wires.
Gas Handling
Basics Geometry
There are 5 Layers on the radial position of the ANASEN.
Structure | Radius [mm] |
---|---|
ionizing wires | 23 |
Guard wires | 33 |
Anode wires | 38 |
Cathode wires | 43 |
SuperX3 Silicon | 88 |
Twisted Anode and Cathodes
Readout
SuperX3 Silicon Detector Array
There are 24 Super-X3 double-sided Silicon detectors on the wall of the ANASEN. They are placed 88 mm away from the beam axis. Each of them has 75 mm X 40 mm sensitive area. Thus, the super-X3 covers a forward and backward angle of 40 deg.
Readout
On the front side, each strip has 2 readouts. On the back side, each strip has 1 readout for total energy.
Tracking for the twisted wire configuration
A beam trace consists of 5 parameters: 3 from a point and 2 from the trace angle . Thus, to reconstruct the beam trace, we need at least 5 pieces of information.
Suppose we know the position on the SuperX3, thus, we have 3 pieces of information . And We have 2 wires ID. Each wire and the will form a plan, the intersection line of the 2 plans will give us the first approximation of the beam trace.
Each wire is constructed from 2 points, let them be and , where is the wire ID. The plane formed by the points has normal . The vector for the line intersects between the 2 planes constructed by wire ID and point </math> \vec{p_0}</math> is . Thus, the beam trace has an equation of , where is the coordinate on the line.
uncertainty
Since the beam is not hit directly on the wires, but a distance from the wire. This will rotate the plane on along the direction by , where is the perpendicular distance of the point and the line. This creates 2 additional planes with normal vectors that are rotated along the line by angle . The 4 additional planes form the uncertainty boundaries of the beam. In other words, the normal vector of the plane has uncertainty that translates to the beam direction vector .
Additional uncertainty comes from the position of the SuperX3.
3D model and Simulation
A simulation code and 3D model using CERN root can be found https://fsunuc.physics.fsu.edu/git/rtang/ANASEN_analysis/src/branch/master/Armory.
The core is the ANASEN class (ClassAnasen.h). This class contains the geometry (the endpoints of the anode and cathode wire, the edges of the SuperX3). The class can simulate the anode and cathode wire and the position at the SuperX3 with a track. Or, it can deduce the track using the SuperX3, anode, and cathode information.
A Monte Carlo simulation is constructed with the TransferReaction class (ClassTransfer.h).
DAQ
The DAQ consists of 7 CAEN V1740D for the SuperX3, 3 CAEN V1735 for the proportional wires.
triggering
Any of the SuperX3 is the trigger. The trig-out of each V1740D will be sent to the input of a Fan-In-Fan-Out (FI-FO), the output of the FIFO will be sent to the TRG-IN of the V1735 digitizers.
Clock Zeroing and Time Sync
one of the V1740D is the master of the reference clock, all other digitizers are slave and use diasy chain CLK-IN CLK-OUT. We a proper PLL firmware settings for the clock, the clock phase of all digitizers would be the same.
To have the same time clock zeroing, we use a Gate generator to generate a clock-zeroing pulse. The pulse will be sent to a FI-FO, and the duplicated clock-zeroing pulse will be sent to all S-IN of the digitizers.
FSUDAQ setting
The FSUDAQ is used for the DAQ control and data taking.
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