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Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | CP-8 |
| Manufacturer | Sumitomo (SHI) |
| Series | Marathon CP |
| Nominal Pumping Speed | 1500 L/s (Air) |
| Water Vapor Capacity | 4200 L/s |
| Argon Capacity | 1100 L/s |
| Pumping Mechanism | Cryogenic (Cold Surface Adsorption) |
| Control Type | Manual / Automatic (with controller) |
| Displex Technology | Yes (Gas Ballast) |
| Maintenance | On-wafer repair possible |
| Weight | 16.8 kg (35 lbs) |
| Compressor | Zephyr or HC-4E1 (Optional) |
Product Introduction
The Sumitomo Marathon CP-8 is a robust, industrial-grade cryogenic vacuum pump designed for high-throughput vacuum applications. It is part of the Marathon CP series, which is widely used in the semiconductor industry for processes such as Physical Vapor Deposition (PVD), Chemical Vapor Deposition (CVD), and ion implantation.This specific model, the CP-8, is a standard-sized cryopump capable of handling large volumes of gas. It utilizes Displex gas ballast technology, which allows it to handle condensable vapors more effectively than standard cryopumps, extending the time between regeneration cycles. The pump features a “cold head” that cryogenically freezes (condenses) gas molecules, removing them from the chamber to create a vacuum.One of the key engineering advantages of the Marathon CP series is the ability to perform maintenance and repairs directly on the wafer or chamber without breaking vacuum, minimizing downtime in critical manufacturing processes.
Installation & Configuration Guide
Preparation (20 min)
- Verify Compressor: Confirm the required compressor model (e.g., Zephyr, HC-4E1) is installed and functional. The CP-8 requires external cooling power.
- Safety Check: Ensure the workspace is clear. Cryopumps contain liquid helium or nitrogen; handle with care to avoid frostbite.
- Tools: Gather a torque wrench, vacuum grease (non-outgassing), and the necessary flange gaskets.
Removal (30 min)
- Isolate Power: Turn off the compressor and disconnect power to the cryopump.
- Break Vacuum (if required): If replacing a running unit, the vacuum must be broken and the system vented. This step may be skipped if performing an “in-situ” repair.
- Disconnect Utilities: Disconnect the cold head power cables and any gas lines.
- Unbolt: Carefully unbolt the cryopump from the vacuum flange and the mounting frame.
Installation (30 min)
- Inspect Gaskets: Check the vacuum O-rings or gaskets. Replace if damaged or dried out.
- Lift and Align: Using proper lifting equipment, hoist the new/repair CP-8 into position. Align the flange bolts.
- Torque Bolts: Tighten the flange bolts to the manufacturer’s torque specification (typically 20-30 N·m) in a cross pattern to ensure an even seal.
- Reconnect Utilities: Reconnect the power cables to the cold head and any necessary sensors.
Power-On & Test (60 min)
- Evacuate System: Slowly bring the system pump down to base pressure.
- Cool Down: Monitor the cold head temperature. It will take approximately 1-2 hours to reach operating temperature (~10K).
- Check Speed: Use a hot-cathode gauge or ionization gauge to verify the pumping speed matches the specifications (1500 L/s air).
- Leak Check: Perform a helium leak test on the flange connections to ensure integrity.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Corrective Action |
|---|---|---|
| No Pumping (Vacuum Not Reaching Base Pressure) | Compressor Failure | Check if the compressor is running. Listen for abnormal noises or check for error codes on the compressor controller. |
| High Backstreaming / Oil Contamination | Oil Mist Filter Clogged | Inspect and replace the oil mist filter on the compressor inlet if present. |
| No Regeneration (Pump Won’t “Warm Up”) | Controller Fault | Ensure the Marathon CP controller is set to “Auto” mode. Check the relay outputs to the heater. |
| Excessive Vibration | Mechanical Mounting | Check that all mounting bolts are tight. Ensure the compressor is level and stable. |
| High Gas Load (Wet Pumping) | Water Vapor Ingress | The pump may be overloaded with water vapor. Consider using a dry pump pre-stage or increasing the regeneration frequency. |
Dimensions, Mounting & Wiring Notes
- Dimensions: Approximate dimensions are 35 lbs (16.8 kg) in weight. The physical size of the CP-8 is compact, designed for easy integration into standard vacuum chambers.
- Mounting: The pump uses a standard flange interface (typically CF or KF flange, verify with the specific model). It is mounted via a frame or directly to the process chamber.
- Wiring: The primary wiring consists of a heavy-duty power cable for the cold head (typically 110V/220V AC) and signal cables for temperature sensors and pressure transducers.
FAQ
1. What is the difference between CP-8 and CP-8LP?
The primary difference is the flange type and pumping speed. The “LP” suffix typically denotes a pump with a larger flange (e.g., 400mm CF vs 200mm CF) and higher pumping speed (e.g., 1800 L/s vs 1500 L/s for the CP-8). The CP-8LP is generally used in larger vacuum systems.2. Can I use this pump for water vapor (steam)?
Yes, but with limitations. The CP-8 has a high water vapor capacity (4200 L/s), but it requires the Displex gas ballast feature to handle condensable vapors. Without the gas ballast, water vapor would freeze in the pump and block the cryogenic surfaces.3. How often does it need to regenerate (warm up)?
Regeneration frequency depends on the gas load. With a clean system, regeneration might occur every 12-24 hours. If pumping large volumes of water vapor or other condensable gases, regeneration may be required every few hours. The system will automatically cycle based on pressure thresholds.4. Is this pump “in-situ” repairable?
Yes. One of the key features of the Marathon CP series is the ability to perform maintenance (such as replacing the sorbent or repairing the cold head) without breaking the vacuum in the process chamber. This is critical for minimizing downtime in production environments.5. What is the “Crossover Rating”?
The Crossover Rating (typically 220 Torr·L/s for the CP-8) indicates the pressure at which the pump transitions from viscous flow to molecular flow. It is a measure of the pump’s ability to handle high gas loads at higher pressures before reaching its ultimate vacuum capability.
