# Installation

Important

Before the system installation, please read the technical manual of the compressor.

## Setting up

The compressor has a transport bolt installed for shipping, before use this has to be removed. To remove the transport bolt raise the left rear corner of the compressor to locate the hex head shipping bolt. Support the compressor base with blocks just high enough to gain access to the bolt.

Caution

Do not raise the corner more than 50 mm (2”).

Use a 17-mm wrench to remove the bolt and retain the bolt for future use. The shipping bolt must be reinstalled prior to shipment.

Place the cryostat on a stable surface. The cryostat does not require to be positioned on an optical table. The compressor must remain upright all the time with a level of less than 5 degree. Space and electrical requirements are described in the installation protocol (see appendix) and the compressors manual.

The optional HiCube 80 Eco pumping station has a transport protection lock and has PE-foam padding that protects the pump during shipment. The hexagon nut has to be loosened and the foam padding has to be removed before first use.

Figure 1 Pictures of the EOS cryostat. (A) Front view of the system showing the fiber inputs. (B) rear view of the system showing the vacuum port and the dc connector. (C) Left view of the system showing the sma connections. (D) Right view of the system showing the ports for connecting the helium tubes and the connector for the cold head motor.

## Power requirements

- HC-4A Zephyr air-cooled helium compressor
    1 phase power, 200 V, 220 V, 230/240 V at 50 Hz or 220 V at 60 Hz Typical power consumption is 3.0 kW at 50 Hz or 3.4 kW at 60 Hz NEMA L6-20P power plug Power should be provided through a separately fused safety switch with 20A SLO-BLO fuses
- HC-4E water-cooled compressor
    1 phase power, 200 V, 230/240 V at 50 Hz or 208/230 V at 60 Hz Typical power consumption is 2.6 kW at 50 Hz or 3.0 kW at 60 Hz
- The Atlas SNSPD driver operates at 100-240 V, uses a maximum of 70 W and should only be used with the supplied power adapter. The 2 and 4 channel drivers use a 2.5 A fuse and the 8 channel driver uses a 3.15 A fuse. The screw cap fusholder is accessible from the back of the driver.
- HiCube 80 Eco pumping station. The pumping station has a switch to switch if between different voltage range. Switch position “115” is for the voltage raine 90..126 V;50/60 Hz and switch position “230” is for 180..254 V;50/60 Hz.

## Compressor environmental requirements

### Ambient conditions

The HC-4A air-cooled compressor requires ambient an air temperature of 4 - 32 °C (40 - 90 °F). Cooling capacity may degrade if ambient temperature is above 28 °C (82 °F). Do not block the inlet or the exhaust panels of the compressor. The HC-4A air-cooled compressor will add approximately 3.2kW of heat to the room air when operating so adequate cooling is required.

Keep at least 600 mm (24”) space at the top, front, back, left and right sides of the air-cooled compressor for air flow and maintenance. Air leaving from the top side of the compressor must be able to flow away from the compressor without going down toward the air inlets.

### Cooling water

The HC-4E water-cooled compressor requires an air temperature of 4 - 40 °C (40 - 104 °F). Cooling capacity may degrade if ambient temperature is above 28 °C (82 °F). The cooling water inlet needs to provide a flow rate of 2.7 L/min and a water temperature of 4-27 °C (40-80 °F). For more detailled information about the cooling water requirements please check the manufacturer’s manual.

## System interconnections

The cryostat needs to be evacuated before starting the cooldown cycle. Connect a turbo pumping station to the cryostat’s vacuum port using a corrugated stainless steel hose (see Figure 1). The vacuum port of the system has a KF-16 vacuum fitting. Untighten the transport lock before first time use of the turbo pumping station. Please also refer to the vacuum pump manual.

## Gas Lines

To interconnect the helium supply and return gas-Iines, follow this sequence:

1. Connect the return line to the compressor return fitting
2. Connect the supply line to the compressor supply fitting
3. Connect the return line to the cold head return fitting
4. Connect the supply line to the cold head supply fitting

To make each connection, tighten the fittings several turns by hand. Use two wrenches to tighten the fittings, and support the gas lines to prevent gas leakage during assembly. Please keep the dust caps for future use. Cold Head Power Make sure the power of the compressor is off. Connect the supplied cable between the cold head and the cold head power connector on the drive unit.

## SNSPD driver

The Atlas electronic driver should be connected in the following sequence:

1. Connect the electrical feedthroughs on the cryostat to the SMA connectors labelled “input” at the front side of the electronic driver with the blue SMA cables;
2. Connect the cryostat to the electronic driver with the Fischer cable ;
3. Connect the power supply to the electronic driver;
4. Connect the USB to Ethernet adapter to the computer
5. Connect the Network cable between the adapter and the electronic driver.

The SMA connectors labelled “output” at the front side of the electronic driver give the direct output of the amplifiers. They can be used to connect to an external counter or a TCSPC device. The driver also has an internal counter, the countrates can be read in the software.

## Optical fibers

Clean the optical fibers and the inside of the fiber connector. Connect the optical fibers to the fiber ports (FC connectors). For inspecting the fibers it is a advised to use a fiber microscope.

Tip: Minimize reconnecting fiber patch cables to the front panel to avoid damaging the bulkhead connectors.