Detector Housing CASCADE-U 100. Bottom-flange. Top-flange with Teflon insulating ring and special Wilson-flange designed to fit the UCN beam pipe

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1 Detector Housing CASCADE-U 100 Bottom-flange with shielding of the readout electronics Shielding of the readout electronics Top-flange with Teflon insulating ring and special Wilson-flange designed to fit the UCN beam pipe HV: Multipin Connector or SHV Connector Prop to hold the detector Gas In/Out Side view Adapter to Wilson-flange Teflon ring Top-flange Sidewall-flange Bottom-flange A massive detector housing integrates the UCN detector front-end. It will accommodate the readout electronics on the backside as well. The housing consists of bottom-, sidewall- and top-flange, which are sealed with O-rings. The top-flange together with a special Wilsonflange are designed to accommodate the detector to the UCN beam pipe. A special ring made of Teflon insulates detector electrically from the beam pipe to reduce electromagnetic noise introduced by surrounding instrumentation like turbo-pumps and HF-generators. Internet: The top- and the Wilson-flange are designed to hold a thin entrance window and to seal the detector against the vacuum of the UCN beam pipe. The entrance window can be removed easily. The detector housing is designed to be operated with variable counting gas pressures between 0.1 bar and 1 bar absolute pressure, if the detector is connected to the evacuated UCN beam pipe.

2 Detector Housing CASCADE-U 100 Cross Section Top View top flange side wall flange bottom flange Wilson flange (blue) adapter flange (yellow) Teflon ring (green) Bottom view of the adapter flange sealing for the entrance window Groove for O- ring sealing The latest development in respect to the detector housing results in an special adapter-flange. Now the top-flange together with such an adapter-flange and the Wilson-flange are used to accommodate the detector to the UCN beam pipe. The adapter-flange can now be exchanged very easily to mount the detector to any UCN beam pipe with diameters up to 100 mm. Internet:

3 The CASCADE DAQBox central FPGA Slots for up to 4 sub-modules USB 2.0 interface CIPix interface with SCSI-3 connector Digital IO galvanically decoupled with Lemo connectors ADC module for pulse height analysis The CASCADE DAQBox is a standalone DAQ-system optimized for readout of one CIPix frontend ASIC and furthermore data-processing up to user-relevant level. For this purpose, it is equipped with an powerful Xilinx FPGA as parallel data processing unit and an high-speed USB 2.0 interface. Up to four sub-modules can be plugged into the DAQBox to realise any desired functionality. Sub-modules are available as CIPix interface, digital I/O, histograming memory or ADC. In dependency of the internal firmware in the FPGA e.g. data counters allow to effectively histogram and thus store detector data to a level, where exclusively user relevant information remains on the memory module. The memory could for example be configured to realise a multidimensional histogram containing a time of flight (TOF) spectrum for every single one of the 64 channels of a CIPix chip simultaneously. Finally, also raw list-mode data can be taken and read out as one possible configuration. The interface of the DAQBox to one CIPix ASB board is realized through one CBusNB sub-module. It provides a connector (SCSI- 3) on the front side of the DAQBox for highspeed (40MHz) and undistorted data transfer over long distance via fully differential signal lines (LVDS). Technical Data: CASCADE DAQ-Box Part Name Technical Data DL707 CBusNB 1.0 Digital-IO SU716 SU706 Desk top box with carrier board DL707-2, USB 2.0 interface with Windows driver, External power supply +6V, FPGA parallel data processing unit Spartan 3 from Xilinx, Automatic download of operating firmware from eprom on board during power up, Programming interface via JTAG, Slots for up to four plug-in sub modules. CIPix interface, interface to one CIPix AS20B-1.1 board via cable SCSI-3 (included), 2 Inputs and 3 Outputs (TTL) with Lemo connectors and activity LED each, each connector galvanically decoupled, 32 MByte histograming memory module, ADC module, 14bit, 40MHz, sub-module compatible to DL707-2 carrier board. Internet:

4 The ASIC Readout Boards AS20-1, AS20-3 and AS20B-1.1 AS20-1 AS20-3 AS20B-1.1 Schematic of the CIPix 1.1 The highly integrated multi-channel analogue front-end electronics is based upon a CMOS ASIC chip called CIPix 1.1. The board does come in three versions: A robust version AS20-3 with input protective circuitry in particular designed for gas detector applications. Noise may prove to be 50% higher. A low noise version AS20-1 where protective circuitry is removed in order to achieve the best possible noise performance. A robust version ASB with input protective circuitry (same as AS20-3) and differential interface (LVDS) for DigitalOut, which allows undistorted data transfer to any DAQ system over long distances. Part Name AS20-1 AS20-3 AS20B-1.1 equipped with one CIPix 1.1 Technical Data 64 independent analogue input channels: low-noise charge sensitive preamplifier (2.9 mv/fc), shaper and discriminator, which accepts statistical data of 330kHz at 10% dead time, Discrimination of positive or negative signals, Discrimination threshold from 200mV up to 200mV programmable via I 2 C-interface, One analogue output of one channel can be chosen free for PHA and monitoring purposes at once, Internal clock 10MHz (Sclk), Output signal 4-fold multiplexed TTL at 40MHz (Rclk), Power requirements ±5V, 200mA each, Analogue output connector Lemo, AS20-1/3:I/O Connectors dual inline 70 pin (Samtec) and connector for daisy chain with 20 pin. AS20B-1.1: I/O Connectors dual inline 68 pin (ERNI). Internet:

5 CDT Detector Control Software Windows based software package CDT Detector Control allows stand alone operation of up to three CASCADE DAQBox systems from a PC or Laptop via USB 2.0. It supports easy configuration of a CASCADE detector system, starting and ending data acquisition as well as data download and event display. The program itself is held in the typical Windows-style. Various types of measurements (e.g. 2D-readout, TOF-spectra or pulse height spectra) can be configured individually in a self explanatory way. Software drivers allow integration of the DAQBox into already existing instrument control under Windows (NT/2000/XP). Support for high level programming under C++ is provided with the CASCADE Hardware-Library, which supplies routines for configuration and measurement of the DAQBox respective the CIPix readout board. Internet: