# Presentation: 631866

## Status of Ion Source at MS6 

**OUTLINE:**
**          ****1. H+ ion source**
**              ****- Test setup**
**              ****- Assembly work**
**              ****- System tests**
**          ****2. H+ ion source first tests **
**              ****- DC operation**
**              ****- AC operation   **
**          ****3. Plans for next tests at MS6**
**          ****4. Work toward the H minus source**
**             ****(to be discussed)**
**             **

## Status of Ion Source at MS6

**Team members:**
**                               ****Chuck Schmidt**
**                               ****Doug Moehs**
**                               ****Henryk Piekarz**
**                                                                            ****--------------------------------------------------------**
**                               ****Phil Gallo**
**                               ****Walter Jaskierny**
**Safety Panel:**
**                               ****Michael Andrews (Chair)**
**                               ****George Krafczyk - electrical**
**                               ****Jim Kilmer - hydrogen gas**
**                               ****Mike Gerardi - radiation **

- A. Zlobin

- 2/24/98

## System test setup – Ion Source & LEBT

**Trim magnets and the toroid are not installed.**
**Diagnostic chamber is also empty.**

- A. Zlobin

- 2/24/98

## System test setup – Ion source

**Left - The H+ ion source arrangement and extraction of plasma**
**Right - Some components of the ion extraction system**

- A. Zlobin

- 2/24/98

## System test setup - Ion source

**Left - Back side of the ion source**
**Right - Back side of the ion source with Faraday cage closed**

- A. Zlobin

- 2/24/98

## System test setup - HV power supply 

**Left – 100 kV (Universal Voltronics), tested to 80 kV**
**Right – Front end of the electronics rack. HV cable to**
**    ****the Ion Source is inside the double PCV pipe.**

- A. Zlobin

- 2/24/98

## LEBT - system

**Left- Solenoid magnets ( 7 kG @ 700 A, < 1/4” flat top)**
**Right – Solnoids supplies ( maximum 600 A ) **

- A. Zlobin

- 2/24/98

## System test setup – H2 gas flow

**With H2 @ 120 mTorr at the filament chamber, accelerating column and test chamber vacuum is  ~ 2 e-7 Torr**

- A. Zlobin

- 2/24/98

## System test setup – engineering drawing

**Layout and dimensions of the Ion source with LEBT are **
**    ****available for beam simulations**

- A. Zlobin

- 2/24/98

## System test setup – Beam detection & measurements

**Beam current measured using the Faraday cup**
**Beam can be very well observed through a quartz window **

- A. Zlobin

- 2/24/98

## First tests and results

**Test settings**
**    ****- H2 flow 120 mTorr**
**    ****- Filament 20 A**
**    ****- IS magnet 25 V, 0.5 A**
**    ****- LEBT 600 A / 500 A**
**    ****- Acc. Pot. = (10 – 50) KV**
**DC beam**
**    ****- Arc supply 160 V, 1 A**
**    ****- IS current ~ 400 uA,**
**Pulsed beam**
**    ****- Arc supply 450 V, 60 A**
**    ****- IS current ~ 15 mA**
**Conclusion: **
**     ****We have a system to explore    **
**     ****the ion source and LEBT**

- A. Zlobin

- 2/24/98

## Improvements & next tests

**Provide HV to the extraction electrode**
**Install stronger power supply to the Ion Source magnet ( x 2 ?)**
**Optimize LEBT (scan**
**    ****currents and positions)**
**Optimize H2 flow**
**Increase arc current**
**Install 1msec modulator**
**Install charging capacitor for the HV power supply**

- A. Zlobin

- 2/24/98

## Radiation hazards with ion source

**There is no measurable radiation around the ion source,**
**    ****LEBT and on the side of the test chamber**
**High level of radiation is observed along the beam path,**
**    ****after passing the 1⁄2” quartz window at the end of the test**
**    ****chamber:**
**    ****DC beam -**
**                 ****At 50 KeV,  115 mrem/h with Faraday cup out**
**                                    ****1.6      “                    “               in**
**                 ****At 40 KeV    20      “                    “              out**
**    ****AC beam –**
**                 ****At 50 KeV,   20      “                    “              out**
**                                    ****0.8      “                    “               in **
**Solution: will install 3” thick glass at the end of the test chamber, so the beam can be still visually observed**
**Monitoring radiation and securing the area downstream of the LEBT (no trespassing beam path) is non- disputable !!!   **

- A. Zlobin

- 2/24/98

## Work toward the H minus Ion Source

**Test Doug’s H-minus source in MS6 setup**
**Fabricate vacuum chamber with 3 turbo pumps for H-minus source**
**New 60 kV HV supply  to support a 3 msec, 15Hz signal, and the H- source current draw**
**New power supplies for solenoids**
**Outline controls & monitoring system for Ion Source & LEBT**
**Moving plans to the HINS test area**

- Turbo pump: TV1001 - remotely
- controlled & monitored,  and its
- For-pump: TriScroll 300

- 80 kV transformer

- A. Zlobin

- 2/24/98