Cryo Pump Buying Guide: CTI, SHI, Helix, and Brooks for Semiconductor PVD and Ion Implant

Last year I sold a "rebuilt" CTI 8F to a research fab in Texas. Two weeks after install, they called me — base pressure wouldn't drop below 5×10⁻⁷ Torr. Turned out the rebuild shop had replaced the charcoal adsorber but missed a slow leak in the second-stage heat exchanger. The customer lost three weeks of chamber qualification time. That's the cryo pump market: the difference between a good unit and a bad one is invisible until it's costing you production.

This guide is for: Engineers or procurement managers buying a used cryo pump for a PVD sputtering system or ion implanter, who need to know which brands hold up, what "rebuilt" actually means, and how to avoid a $25,000 mistake.

If you get this wrong, you're looking at $15,000–$30,000 in wasted spend between the pump, the compressor, emergency cold head replacement, and the production downtime while your chamber sits at atmosphere.

CTI 8F vs CTI-Cryogenics 9600: Which One and Why

The CTI 8F is the most common used cryo pump on the market. Period. Thousands were installed on AMAT Endura PVD systems through the 2000s and 2010s, and they show up constantly as fabs decommission older 200mm lines. Expect to pay $3,500–$7,000 for a used unit depending on condition and remaining cold head life.

The CTI-Cryogenics 9600 is a larger pump — higher pumping speed, bigger cryoarray — and you'll find them on larger PVD cluster tools and some ion implanters. Prices run $5,000–$9,000 used. The 9600 uses the same basic architecture as the 8F but the second-stage array is significantly larger, which means longer regeneration cycles between warmups.

Here's what matters: cold head hours. A CTI cold head lasts roughly 30,000–40,000 hours before the seals and displacer need replacement. That replacement costs $8,000–$12,000 from a qualified shop. If someone is selling you a "low-hour" pump, ask for the elapsed time meter reading. If they can't provide it, assume worst case.

SHI RG Series: The Japanese Alternative Worth Considering

Sumitomo Heavy Industries (SHI) RG-series pumps — the RG-210, RG-510 — are common on TEL and Hitachi platforms. They're well-built, but parts availability outside Japan is tighter than CTI. A used SHI RG-210 runs $4,000–$8,000. The cold head replacement is comparable to CTI at $10,000–$15,000, but lead times for SHI parts can stretch to 8–12 weeks if your rebuild shop doesn't stock them.

If you're running TEL PVD or a Hitachi ion implanter, stick with SHI — the mounting flanges and controller interfaces are designed for it. If you're retrofitting onto a non-Japanese platform, go CTI. The adapter plate and controller mismatch headaches aren't worth the savings.

Helix 8 and Brooks IQMD: Newer Options at Higher Prices

The Helix CTI-8 (Helix Technology was acquired by Brooks) and the Brooks IQMD represent the newer generation. The IQMD has integrated diagnostics — it tracks cold head hours, regeneration counts, and helium charge pressure internally. That's genuinely useful for a used buyer because you can pull the service history from the controller.

Expect to pay $6,000–$11,000 for a used Brooks IQMD. Worth the premium if diagnostics matter to your maintenance program. The Helix 8 slots between CTI and Brooks pricing at $5,000–$9,000.

What "Rebuilt" Actually Means — And What It Doesn't

A proper cryo pump rebuild includes: new charcoal on the second-stage array, new first-stage radiation shields if damaged, displacer and seal replacement in the cold head, leak testing of the helium circuit to below 1×10⁻⁹ atm·cc/sec, and a full cooldown test to verify base temperature reaches 10–12K on the second stage.

A cheap rebuild skips the helium leak test, reuses the old charcoal if it "looks fine," and sends you a pump that works for 60 days before the adsorber saturates and your base pressure drifts. Ask the rebuild shop for the leak test certificate and the cooldown curve. If they can't produce both, find a different shop.

Cross-Contamination: Why Implant Pumps and PVD Pumps Aren't Interchangeable

This catches people. A cryo pump that ran on an arsenic or phosphorus ion implanter has residual dopant contamination baked into the cryoarray and charcoal. If you put that pump on a PVD system depositing metal films, you risk contaminating your films with parts-per-billion levels of arsenic. For research, that might be acceptable. For production, it's a disqualifier.

Always ask what process the pump previously served. Implant-service pumps should stay on implant tools or go through a full array replacement — not just a charcoal swap — before going on a clean PVD chamber. That array replacement adds $2,000–$4,000 to the rebuild cost.

Helium Compressor: The Part Everyone Forgets to Budget For

Your cryo pump is useless without a working helium compressor. A used CTI 8200 compressor runs $3,000–$6,000. A new one is $12,000+. The compressor's adsorber cartridge needs replacement every 20,000 hours ($400–$800). If the compressor has been sitting unused for more than a year, the helium charge has probably leaked down and needs topping off — that's a $500–$1,000 service call.

Budget for the compressor when you budget for the pump. I see buyers spend $7,000 on a nice rebuilt pump and then balk at $4,000 for the compressor. The system doesn't work without both.

What to Do Next

Get the cold head hour meter reading, the previous process application, and the rebuild documentation before you commit. If the seller can't provide these, negotiate the price down by at least the cost of a cold head rebuild ($8,000–$12,000) because you're going to need one. Contact us for current inventory on used cryo pumps with verified service histories.

Frequently Asked Questions

How long does a cryo pump cold head last? Expect 30,000–40,000 operating hours before a displacer and seal rebuild is needed. Some shops push them to 50,000 hours, but failure risk climbs significantly past 40K.

How much does a cryo pump cold head replacement cost? $8,000–$15,000 depending on the model and rebuild shop. CTI 8F cold heads are on the lower end; SHI and Brooks IQMD are higher.

Can I use an ion implant cryo pump on a PVD system? Not without a full cryoarray replacement. Residual dopant contamination (arsenic, phosphorus, boron) from implant service will contaminate PVD metal films. Budget $2,000–$4,000 for the array swap on top of rebuild costs.

How often do cryo pumps need regeneration? Depends on gas load. PVD systems with argon process gas typically need regeneration every 200–500 hours. High-gas-load applications like etch or implant may need regen every 50–100 hours.

What's the difference between CTI 8F and Brooks IQMD? The IQMD is the newer generation with integrated diagnostics (hour tracking, regen count, helium pressure monitoring). The 8F is the workhorse — cheaper, widely available, but you're flying blind on service history unless the seller kept records.

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Related reading:

• Dry Pump Buying Guide for Semiconductor Applications
• Used Ion Implant Equipment Buying Guide